http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/-t1.htm A place to ask questions and share answers about HW. Sun, 19 Apr 2009 08:54:18 GMT 10 http://illiweb.com/fa/prosilver/site_logo.gif http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/-t1.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/homework-assignment-help-t218.htm Anonymous Assignment help , homework help , Project help , online homework, chemistry help, physics help, Math help, statistics help, accounts, economics, biology help. I have recently started using this great education portal. It has helped me receive all kinds of educational help. This place offers assignment, homework, project help and much more. You must see it for yourself before you are left out and at loss in your academics. Here is the address for the site: They have ... Maple TA HW Help 121 Sun, 19 Apr 2009 08:54:18 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/homework-assignment-help-t218.htm#2196 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/homework-assignment-help-t218.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/chapter-31-32-t162.htm Anonymous How do you find the magnitude and direction of two vectors that each have a magnitude of 3.0 m? Maple TA HW Help 121 Sat, 21 Feb 2009 02:27:00 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/chapter-31-32-t162.htm#1627 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/chapter-31-32-t162.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/chapter-31-32-t161.htm Anonymous How do you find the magnitude and direction of two vectors that each have a magnitude of 3.0 m? Maple TA HW Help 121 Sat, 21 Feb 2009 02:16:28 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/chapter-31-32-t161.htm#1626 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/chapter-31-32-t161.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-143-help-t104.htm periwinkle 1) The temperatures of the heat reservoir and the heat sink of a heat engine are 679.6 oC and 350 oC respectively. What is the power output of the engine if it draws heat at a rate of 31.21 KW from the heat reservoir and it's real efficiency is 0.4919 of the ideal efficiency (see sheet 17,19) ? Indicate with a positive (negative) sign whether one can (cannot) calculate the real efficiency of the engine from the two temperatures alone. Answer: -5311.031005405406 How to solve: 2) The ... Maple TA HW Help 121 Mon, 01 Dec 2008 05:06:05 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-143-help-t104.htm#1002 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-143-help-t104.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-142-help-t103.htm periwinkle 1) A gas does 359.4 J of work at constant temperature ("isothermal"). How much heat is exchanged with the environment (see sheet 8,12') ? Indicate with a positive (negative) sign whether heat is put into (taken out of) the gas. Answer: 359.4 How to solve: 2) An ideal gas changes its pressure and volume as shown in the PV-diagram starting at point A and returning to it. The pressure PAB is 1.575 atm and volume VB is 366.3 cm3. The pressure at C is 1 atmosphere. How many calories ... Maple TA HW Help 121 Mon, 01 Dec 2008 05:04:49 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-142-help-t103.htm#1001 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-142-help-t103.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-133-help-t99.htm Anonymous Question 1: (1 point) A window pane with an 0.686 m2 area separates a room at 20 oC from the outside air at -10.41 oC. What is the power conducted through the 2.45 mm thick window pane (see sheet 22; use for the thermal conductivity of glass 0.8 W m-1 oC-1)? Indicate with a positive (negative) sign whether a styrofoam sheet of the same dimensions as the window pane conducts more (less) power. How to solve: Question 2: (1 point) It takes 78.55 kcal to melt the amount ... Maple TA HW Help 121 Sun, 30 Nov 2008 20:29:13 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-133-help-t99.htm#983 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-133-help-t99.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-132-help-t96.htm periwinkle Question 1 53.39 grams of steel at 106.2 oC is put into 0.7382 liter of water at 20 oC. What is the final temperature at equilibrium assuming no heat loss to the environment (see sheet 12; use 0.107 cal g-1 oC-1 for the specific heat of steel) ? Indicate with a positive (negative) sign whether the steel looses less (the same amount of) heat than the water gains. Answer: -20.66195577268855 How to solve: Question 2 97.32 grams of ice are added to 148.1 grams of water at a temperature ... Maple TA HW Help 121 Tue, 18 Nov 2008 03:11:36 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-132-help-t96.htm#892 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-132-help-t96.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-141-help-t102.htm periwinkle 1) A gas expands at a constant pressure of 2.987 atm its volume from 9.813 liter to 19.99 liter. What is the work done by the gas (see sheet 7; include the correct sign) ? Answer: 3079.3882086999997 How to solve: 2) 32.43 cal heat are added to a gas which does 211.2 J work by expanding. What is the change in internal energy of the gas (see sheet ? Indicate with a positive (negative) sign whether the internal energy increases (decreases). Answer: -75.41558999999998 How to solve: 3) ... Maple TA HW Help 121 Mon, 01 Dec 2008 05:00:55 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-141-help-t102.htm#1000 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-141-help-t102.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-131-help-t95.htm periwinkle Question 1 A constant force of 121.5 N acts tangentially on the wheel shown which has a 41.22 cm radius. The wheel axis through the center point is inserted into a hole where it has a tight fit causing friction which generates heat. How much heat in calories is generated during 290.5 turns (see sheet 3; calculate the work done by the force against the frictional torque- see sheet Ch 8 sheet 38) ? Answer: 21832.693079432847 How to solve: Question 2 A 30.83 kg person runs 43.22 ... Maple TA HW Help 121 Tue, 18 Nov 2008 03:08:34 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-131-help-t95.htm#891 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-131-help-t95.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-123-help-t94.htm periwinkle Question 1 A container holds 10.89 grams Oxygen molecules at 350.3 degrees K. What is the internal (translational kinetic) energy of the gas (see sheet 15,23 and consider that the Oxygen molecule has 2 atoms)? Indicate with a positive (negative) sign whether the internal energy is less (greater) than the average kinetic energy of the molecules. Answer: -1485.970 How to solve: Question 2 What is the average (translational) kinetic energy of the atoms contained in 1.895 moles of ... Maple TA HW Help 121 Tue, 18 Nov 2008 03:05:08 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-123-help-t94.htm#890 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-123-help-t94.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-122-help-t86.htm Anonymous Question 1 How many moles are 8.605 x1022 molecules (see sheet 6) ? Indicate with a negative (positive) sign whether the same number of atoms in a metal (do not) make up the same number of moles. Answer: -0.1429401993355482 How to solve: Question 2 Hydrogen gas at atmospheric pressure and 13.38 oC occupies a volume of 1.316 cm3. What is the number of hydrogen atoms in multiples of 1020 (divide your result by 1020) (see sheets 6,15). Indicate with a positive (negative) sign whether ... Maple TA HW Help 121 Thu, 13 Nov 2008 06:06:37 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-122-help-t86.htm#774 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-122-help-t86.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-121-help-t85.htm Anonymous Question 1 1) A temperature is quoted as 60.16 oF. What is it in oC (see sheet 3)? Answer: 15.644444444444442 How to solve: Tc = (5/9)*(Tf-32) Tc = temperature in degrees Celsius Tf = temperature in degrees Fahrenheit Question 2 2) A temperature difference is quoted as 22.27 oC. What is the temperature difference quoted in oK (see sheet 3) ? Indicate with a positive (negative) sign whether the relation between DT in oC and oK is (not) the same for DT in oC and oF. Answer: ... Maple TA HW Help 121 Thu, 13 Nov 2008 06:01:43 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-121-help-t85.htm#773 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-121-help-t85.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-113-help-t84.htm Guest01 Question 1 The flow rate of a fluid through a pipe with a cross sectional area of 18.19 cm2 is 18.32 liters per second. What is the speed of the fluid (see sheet 25). Indicate with a positive (negative) sign whether the expression you use is valid for a fluid that cannot be (can easily be) compressed. How To Solve Answer is Question 2 Water flows through a pipe vertically upward. The pipe has the same cross sectional area everywhere. You mark two points on the pipe, one 1.129 ... Maple TA HW Help 121 Thu, 13 Nov 2008 03:25:46 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-113-help-t84.htm#770 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-113-help-t84.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-112-help-t81.htm Anonymous Question 1: A hydraulic lift has a circular piston of 23.36 cm diameter at the point where the heavy load is to be lifted (see sheet 15)and a small diameter piston with a diameter of 3.806 cm which activates the lift. What is the ratio of the load over input force ? Indicate with a negative (positive) sign whether the liquid on the input side has to be pushed along a larger (same) distance as the distance the load-piston travels during the lift. How to solve: Question 2: A ... Maple TA HW Help 121 Mon, 10 Nov 2008 18:55:30 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-112-help-t81.htm#696 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-112-help-t81.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-111-help-t79.htm Guest01 Question 1 Calculate the force exerted by the atmospheric pressure on an area of your body which is a square 13.42 cm on a side. Use 1.013x105 P (Pascal= 1N/m2) for the atmospheric pressure (see sheet 3,7). Indicate with a positive (negative) sign whether the force is small compared to (similar to) your body weight. How To Solve Answer is Negative. We need to use the formula P = F/A where P is the pressure, F is the Force, and A is the Area the force is acting on. Since we are ... Maple TA HW Help 121 Sat, 08 Nov 2008 21:38:00 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-111-help-t79.htm#665 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-111-help-t79.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/chapter-103-quiz-t78.htm Anonymous I know it's early, but just to get a headstart on the weekend's work! 1.) The traveling wave velocity on a 0.4335 mlong string is 171.7 m/s. What is the frequency of the 5 th harmonic (see sheet 19). Indicate with a positive (negative) sign whether the frequency you calculated is (is not) an integer multiple of the fundamental frequency ? 2.) The standing sound wave in a pipe with one end open has a fundamental frequency of 482.9 Hz. What is the length of the pipe (see sheet 26,use ... Maple TA HW Help 121 Thu, 06 Nov 2008 22:09:01 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/chapter-103-quiz-t78.htm#638 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/chapter-103-quiz-t78.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-102-quiz-t77.htm Anonymous 1.) A car speeds away with 139.6 km/hrfrom a factory which emits a whistle sound at 1,318 Hz. What is the frequency registered by the driver of the car (see sheet 12,use 343 m/s for the speed of sound)? Indicate with a negative (positive) sign whether the frequency registered would be higher (lower) if the car moved toward the station 2.) You approach a wall while emitting sound at 326 Hz. The sound is reflected from the wall back at you and you register a reflected frequency of 551.5 ... Maple TA HW Help 121 Wed, 05 Nov 2008 23:08:17 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-102-quiz-t77.htm#626 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-102-quiz-t77.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-101-help-t72.htm Anonymous Question 1: (1 point) 1) The speed of sound in air is 343 m/s. What is the wavelength of a sound wave that has a frequency of 483.5636 Hz (see sheet 3,3') ? Indicate with a positive (negative) sign whether the formula you use is only valid for sound waves (is valid for many waves, e.g. waves on a string, radio waves,...). (How to solve): Question 2: (1 point) 2) A sound source assumed to be a point emits a power of 10.001 W. What is the sound intensity at a distance ... Maple TA HW Help 121 Thu, 30 Oct 2008 14:18:02 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-101-help-t72.htm#594 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-101-help-t72.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-93-help-t67.htm Guest01 Question 1 A compressed spring with a spring constant of 129.4 N/m has 8.015 J potential energy stored in it. How far is the spring compressed from its relaxed state (see sheet 22)? Indicate with a positive (negative) sign whether the spring has a different (the same) potential energy stored in it when it is stretched by the same amount. How To Solve Answer is Question 2 A spring with a spring constant of 53.899 N/m which is aligned vertically is compressed by 18.426 cm ... Maple TA HW Help 121 Tue, 28 Oct 2008 00:31:04 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-93-help-t67.htm#562 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-93-help-t67.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-92-help-t66.htm Anonymous Question 1: (1 point) An object in SHM with a period of 7.741 s has a maximum velocity of 4.957 m/s. What is the amplitude (see sheet 6)? (How to solve): Question 2: (1 point) An object in SHM has a maximum velocity of 11.86 m/s and an amplitude of 0.6553 m. What is the magnitude of the maximum acceleration (see sheet 6)? Indicate with a positive (negative) sign whether the acceleration as a function of time can (cannot) be written as -(2 /T)2x, where x is the displacement ... Maple TA HW Help 121 Mon, 27 Oct 2008 13:19:30 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-92-help-t66.htm#559 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-92-help-t66.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-9_1-quiz-t59.htm Anonymous 1) Uniform circular motion in the x-y plane is projected onto the x-axis resulting in an oscillation, simple harmonic motion (SHM). If the radius of the circle is 0.1535 m what is the amplitude of the oscillation (see sheet 3)? Indicate with a negative (positive) sign whether the projection onto the y-axis would (not) result in SHM, however with different initial (t = 0) condition (see sheet 4'). 2) Uniform circular motion in the x-y plane is projected onto the x-axis resulting in an oscillation, ... Maple TA HW Help 121 Sun, 26 Oct 2008 01:26:36 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-9_1-quiz-t59.htm#503 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-9_1-quiz-t59.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-62-help-t28.htm Guest01 Question 1 A person starting with an initial downward velocity of 2.446 m/s falls a vertical distance of 0.858 m. What is the final velocity of the person (see sheet 15)? Neglect friction in the air and indicate with a negative (positive) sign whether your equation for the conservation of the mechanical energy leads (does not lead) to equation (2.7) in Ch 2, that is an equation which does not use any energy principle. How to solve (Answer is negative) vfinal=√(v02+(2*g*h)) vfinal=√(2.446m/s22+(2*9.81m/s2*0.858m) vfinal=√(5.982916+16.83396) vfinal=√(22.816876) vfinal=Spoiler:4.777 Question ... Maple TA HW Help 121 Wed, 01 Oct 2008 09:51:51 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-62-help-t28.htm#158 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-62-help-t28.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-92-help-t60.htm Guest01 Question 1 An object in SHM with a period of 11.139 s has a maximum velocity of 1.323 m/s. What is the amplitude (see sheet 6)? How To Solve Answer is positive Question 2 An object in SHM has a maximum velocity of 24.48 m/s and an amplitude of 0.5913 m. What is the magnitude of the maximum acceleration (see sheet 6)? Indicate with a positive (negative) sign whether the acceleration as a function of time can (cannot) be written as -(2/T)2x, where x is the displacement as ... Maple TA HW Help 121 Sun, 26 Oct 2008 19:32:04 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-92-help-t60.htm#521 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-92-help-t60.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-8_3-help-t54.htm Anonymous Can't seem to get these two problems, any help would be greatly appreciated.... 3) A mass m = 0.7977 kg hangs from a 3.593 kg uniform disk via a string which is wound around the circumference of the disk (see sheet 21 with no counter weight on the left hand side). After you release the mass it accelerates downward. (Assume that the the string does not slip while unwinding from the disk). What is the linear acceleration of the mass ? (see sheet 23 on how to express the torque due to m in ... Maple TA HW Help 121 Tue, 21 Oct 2008 03:44:58 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-8_3-help-t54.htm#414 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-8_3-help-t54.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-82-help-t51.htm Anonymous Question 1: (1 point) A wheel starts out at rest and makes 2.763 revolutions under a constant angular acceleration of 3.076 rad/s2. It then stops abruptly. How long was the wheel in motion (see sheet 11)? Indicate with a negative (positive) sign whether the angle through which the wheel turns is (is not) given in SI units. (How to solve): Question 2: (1 point) A disk under a constant angular acceleration of 0.9853 rad/s2 increases its initial angular velocity of ... Maple TA HW Help 121 Sun, 19 Oct 2008 15:52:04 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-82-help-t51.htm#368 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-82-help-t51.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-81-help-t40.htm Guest01 Question 1 A disk turns with an average angular velocity of 0.4173 rad/s. Through which angle in degrees does the disk turn in 2.613 sec (see sheet 3)? Indicate with a negative (positive) sign whether a point on the disk at larger distance r from the center of rotation moves faster (slower) than a point at smaller distance r from the center. How to Solve: (Answer is _______) ω = (ΔΘ)/(Δt) Question 2 A point marked at the edge of a rotating disk which has a radius of ... Maple TA HW Help 121 Wed, 15 Oct 2008 00:05:42 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-81-help-t40.htm#246 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-81-help-t40.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-73-help-t39.htm Anonymous anyone have any clue? Maple TA HW Help 121 Tue, 14 Oct 2008 19:17:08 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-73-help-t39.htm#233 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-73-help-t39.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-8_1-quiz-t49.htm Anonymous Question 1: (1 point) A disk turns with an average angular velocity of 0.9245 rad/s. Through which angle in degrees does the disk turn in 4.245 sec (see sheet 3)? Indicate with a negative (positive) sign whether a point on the disk at larger distance r from the center of rotation moves faster (slower) than a point at smaller distance r from the center. Question 2: (1 point) A point marked at the edge of a rotating disk which has a radius of 21.59 cm moves a distance of 8.806 ... Maple TA HW Help 121 Fri, 17 Oct 2008 14:10:47 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-8_1-quiz-t49.htm#351 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-8_1-quiz-t49.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/maple-ta-quiz-73-t36.htm Anonymous Question 1: (1 point) A 44.01 gram bullet with a speed of 207.9 m/s hits the 1.001 kg suspended block of a ballistic pendulum and stays embedded in the block. How high does the struck block rise (see sheet 21-23)? Indicate with a negative (positive) sign whether the collision between the bullet and the block is perfectly inelastic (elastic). Question 2: (1 point) A billiard ball with a velocity of 19.96 m/s makes an elastic head-on collision with another ball (same mass) ... Maple TA HW Help 121 Mon, 13 Oct 2008 19:24:02 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/maple-ta-quiz-73-t36.htm#220 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/maple-ta-quiz-73-t36.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-72-help-t33.htm Anonymous Question 1: (1 point) NOTE! See the corrected sheet 15' under "Lectures" on the web! Two cars, car(1) with 1,043 kg mass and a velocity of 15 m/s and car(2) with 2,081 kg mass and unknown velocity approach an intersection at 90o with respect to each other and collide. Immediately after the collision the cars slide stuck together with a velocity of 18.48 m/s. What is the speed of car (2) before the collision (see sheet 10,12-15, 15' summarizes the quick way )? (How ... Maple TA HW Help 121 Fri, 10 Oct 2008 03:50:01 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-72-help-t33.htm#202 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-72-help-t33.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-72-help-t34.htm Anonymous Does anyone know how to solve these? Maple TA HW Help 121 Mon, 13 Oct 2008 13:30:39 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-72-help-t34.htm#211 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-72-help-t34.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-71-help-t32.htm Guest01 Question 1 An object of 1.1988 kg mass has a horizontal velocity component of 2.409 m/s and a vertical velocity component of 3.82 m/s. What is the magnitude of the momentum of the particle (see sheet 3; (7.1) stands for 2 equations, x-and y-component)? Indicate with a negative (positive) sign whether the SI unit of momentum is the combination kg·m/s reflecting the definition of momentum (is the combination kg·m/s contracted into a new name). How to Answer (Answer is Negative) p ... Maple TA HW Help 121 Fri, 10 Oct 2008 02:48:57 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-71-help-t32.htm#201 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-71-help-t32.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-63-help-t30.htm Guest01 Question 1 A 50 kg person starting with an initial downward velocity of 1.2048 m/s dips into a 2.395m deep pool. If 699.4J kinetic energy are lost due to friction what is the arrival speed at the bottom of the pool (see sheet 15) (If you know about "Buoyancy" disregard it.)? Indicate with a negative (positive) sign whether the potential energy of the person does (does not) change while sinking in the pool. How to solve (Answer is negative) First Calculate the KE and PE. KE ... Maple TA HW Help 121 Sun, 05 Oct 2008 01:12:31 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-63-help-t30.htm#174 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-63-help-t30.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-31-help-t4.htm Admin I will fill in the blanks as answers get solved but seeing as this is old I doubt anybody needs them. Question 1: (1 point) A person in a rowboat crosses a river which flows with 2.748 km/hr. The person rows with maximum velocity of 1.268 km/hr relative to the water (measured while rowing on a still lake) and heads the boat straight across the river - along a line at 90 degrees with respect to the river shore pointing to a point on the opposite shore. How far downstream from this ... Maple TA HW Help 121 Wed, 17 Sep 2008 20:36:55 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-31-help-t4.htm#4 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-31-help-t4.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-61-help-t27.htm Anonymous Question 1: (1 point) A box on a frictionless horizontal plane is pulled a distance of 15.83 m by an attached rope which makes an 35.46 degrees angle with the vertical and is under a 7.915 N tension. What is the work done (see sheet 3). Indicate with a negative (positive) sign whether the component of the tension perpendicular to the displacement is doing work (does not do any work). (How to solve:) Question 2: (1 point) An object with a 3.69 kg mass is lifted by ... Maple TA HW Help 121 Tue, 30 Sep 2008 23:56:39 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-61-help-t27.htm#154 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-61-help-t27.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-53-help-t25.htm Anonymous Question 1: (1 point) A bobsled at 158 km/hr turns around a curve with a 46.69 m radius of curvature on a banked ice track. What is the banking angle if banking alone (friction neglected) is to hold the sled on its track (see sheet 19,20)? Indicate with a negative (positive) sign whether the banking angle increases (decreases) with increasing speed. (How to solve): Question 2: (1 point) A planet has a radius of 6.491 x106 m and a mass of 6.82 x1024 kg. What is the gravitational ... Maple TA HW Help 121 Mon, 29 Sep 2008 03:17:04 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-53-help-t25.htm#130 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-53-help-t25.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-52-help-t23.htm Anonymous Question 1: (1 point) The cabin of a merry-go-round moves in a vertical circle of 5.874 m radius making a full turn every 12.45 seconds. What is the apparent weight of a 31.48 kg passenger at the top of the circle (see sheet 12, Ch4 sheet 16)? Indicate with a negative (positive) sign whether the apparent weight at the top is smaller (larger) than the apparent weight at the bottom. (How to solve): Question 2: (1 point) You swing an 0.3579 kg mass held by a wire in ... Maple TA HW Help 121 Fri, 26 Sep 2008 13:35:34 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-52-help-t23.htm#103 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-52-help-t23.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-51-help-t20.htm Anonymous Question 1: (1 point) An angle subtends a fraction 0.1146 of the circumference of a circle. What is the angle in radians (see sheet 3) ? Indicate with a negative (positive) sign whether your numerical result when expressed in degrees is smaller (larger) than your result in radians. How to solve: Question 2: (1 point) An object moves with constant speed on a circle of 0.5314 m radius due to a centripetal acceleration of 4.306 m/s2. What is the speed of the object (see sheet ... Maple TA HW Help 121 Thu, 25 Sep 2008 13:34:10 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-51-help-t20.htm#90 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-51-help-t20.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-43-help-t9.htm Admin Question 1: (1 point) A 4.285 kg block slides with constant velocity on a horizontal plane. The coefficient of friction is 0.2134 . The block is pushed by a force which is parallel to the plane. How large is this force (see sheet 6,30 and 24,29,29')? Indicate with a negative (positive) sign whether the direction of this force can (cannot) be obtained from the direction in which the block is sliding. How to solve: Question 2: (1 point) A block slides down an inclined ... Maple TA HW Help 121 Thu, 18 Sep 2008 04:52:18 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-43-help-t9.htm#12 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-43-help-t9.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-42-help-t8.htm Admin Question 1: (1 point) A person's weight is 416.3 N. What is the person's apparent weight when riding in an elevator which accelerates with 0.6748 m/s2 on its way down (see sheet 16,18')? Indicate with a positive (negative) sign whether the result is the same (not the same) if the elevator accelerates with the same acceleration on its way up. How to solve: Question 2: (1 point) Two blocks are connected via a string that runs over a pulley (see sheet 19, replace the 30 ... Maple TA HW Help 121 Thu, 18 Sep 2008 01:32:41 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-42-help-t8.htm#8 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-42-help-t8.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-41-help-t7.htm Admin ***Make use of this site. Get Help, Give Help, Pass Physics*** Question 1: (1 point) A 5.373 N force directed north and a 3.29 N force directed east act on an object of 456.3 grams. What is the acceleration of the object (sheet 5)? How to solve: Use a^2+b^2=c^2 5.373^2+3.29^2=c^2 c^2=39.6932 c=6.3003 Then use F=M*A to solve for a (change grams to kg) 6.3003/.4653=A A=13.8073 Question 2: (1 point) A 4.888 N force directed west and a 3.879 ... Maple TA HW Help 121 Wed, 17 Sep 2008 21:08:52 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-41-help-t7.htm#7 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-41-help-t7.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-33-help-t6.htm Admin Question 1: (1 point) A football is kicked from level ground and lands after 1.076 s back on the ground. What is the vertical component of the velocity with which the ball leaves the kicker's foot (sheet 17,19,21)? How to solve: first divide t by 2 to get the time of the maximum height where V=0 t/2=.538 use equation V=V0+At to solve for V0 0=V0-9.81*.538 V0=9.81*.538 V0=5.2778 Question 2: (1 point) A projectile is launched horizontally from a height ... Maple TA HW Help 121 Wed, 17 Sep 2008 21:04:10 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-33-help-t6.htm#6 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-33-help-t6.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-32-help-t5.htm Admin I will fill in the blanks as answers get solved but seeing as this is old I doubt anybody needs them. Question 1: (1 point) The x-component of a velocity vector is 4.348 m/s and the y-component is 3.19 m/s. What is the magnitude of the velocity (sheet 3,4 and 5)? How to solve: Question 2: (1 point) The magnitude of a velocity vector is 6.011 and its direction is 152.8 degrees (measured counter clockwise from the positive x-axis). What is the y-component (sheet ... Maple TA HW Help 121 Wed, 17 Sep 2008 20:40:09 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-32-help-t5.htm#5 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-32-help-t5.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-23-help-t3.htm Admin I will fill in the blanks as answers get solved but seeing as this is old I doubt anybody needs them. Question 1: (1 point) An object, initially at rest, falls under the influence of gravity (neglect air resistance) and reaches a speed of 8.34 m/s. For how many seconds did it fall (see sheet 19)? Indicate with a positive (negative) sign whether with air resistance the fall time is smaller (larger) than without air resistance. How to solve: Question 2: (1 point) An ... Maple TA HW Help 121 Wed, 17 Sep 2008 20:33:56 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-23-help-t3.htm#3 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-23-help-t3.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-22-help-t2.htm Admin I will fill in the blanks as answers get solved but seeing as this is old I doubt anybody needs them. Question 1: (1 point) An object moves for 8.435 s with an average acceleration of 4.384 m/s2. What is the change in velocity (see sheet 11)? How to solve: Question 2: (1 point) An object moves with constant acceleration of 1.679 m/s2 for 4.318 s and reaches a final velocity of 50.19 m/s. What was its initial velocity (see sheet 13)? How to solve: Question ... Maple TA HW Help 121 Wed, 17 Sep 2008 20:31:25 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-22-help-t2.htm#2 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-22-help-t2.htm http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-21-help-t1.htm Admin I will fill in the blanks as answers get solved but seeing as this is old I doubt anybody needs them. Question 1: (1 point) An object travels from a position 343.7 cm to 788.5 cm with an average velocity of 1.055 m/s. How many seconds does the trip last (see sheet 3 , 3')? How to solve: Question 2: (1 point) The position vs time graph of an object moving with constant speed is described by x=3.454 t with position x and time t in SI units. Give the value of the ... Maple TA HW Help 121 Wed, 17 Sep 2008 20:28:17 GMT http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-21-help-t1.htm#1 http://sbphysics121.forumotion.net/maple-ta-hw-help-121-f1/ch-21-help-t1.htm