# Ch 4.1 Help ## Ch 4.1 Help

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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 N force directed south act on a 1.93 kg object. What is the direction of the object's acceleration (sheet 5)? Give the direction as an angle in degrees and measured from the west direction going counter clockwise.

How to solve:
First take the arctan of the first force divided by the second.

arctan(4.888/3.879)=51.5653

then subtract your number from 90 degrees

90-51.5653=38.43468

Question 3: (1 point)

A 2.077 kg block is held at rest on a plane which is inclined by 14.82 degrees with respect to the horizontal. The force holding the object on the plane is directed parallel to the inclined plane. What is the magnitude of this force (sheet 11,13, neglect friction)?

How to solve:

Question 4: (1 point)

A person's mass is 64.82 kg. What is the person's apparent weight when riding in an elevator which moves with constant velocity (sheet 16)? Indicate with a positive (negative) sign whether the result is the same (is not the same) as for the elevator at rest.

How to solve:[/b]

Last edited by Admin on Wed Sep 17, 2008 10:59 pm; edited 1 time in total

## Question 3

Question 3
A 2.077 kg block is held at rest on a plane which is inclined by 14.82 degrees with respect to the horizontal. The force holding the object on the plane is directed parallel to the inclined plane. What is the magnitude of this force (sheet 11,13, neglect friction)?

How to solve:
2.077 kg * 9.81 * sin(14.82) = 5.2116

## Question 4

Question 4: (1 point)

A person's mass is 64.82 kg. What is the person's apparent weight when riding in an elevator which moves with constant velocity (sheet 16)? Indicate with a positive (negative) sign whether the result is the same (is not the same) as for the elevator at rest.

How to solve:
64.82 * 9.81 = 635.8842

## Question 2

Question number 2 is incorrect. If someone knows how to do that problem please reply soon.

Guest
Guest

## Re: Ch 4.1 Help

For question 2:

Take arctan of 2nd force/1st force.

superwhi
Guest

## Re: Ch 4.1 Help

Solution for problem two worked for me and I tried it on multiple problems before I posted the solution. I hope it is working for most people.

## Chapter 4_1 Practice Quiz

In case anyone forget their CDs.

nick1230
Guest

## Q3 in 4_1 can any one help

has anybody done that?

## Re: Ch 4.1 Help

see the post where is said ch4.1 help!!

## Re: Ch 4.1 Help 