# Ch 3.1 Help

## Ch 3.1 Help

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 point in km does the person reach the opposite shore if the river is 0.1771 km wide (sheet 13, similar to 15, but figure on the right on sheet 16"' is relevant )?

How to solve:

Question 2: (1 point)

A person in a rowboat crosses a river which flows with 3.367 km/hr. The person rows with maximum velocity of 7.743 km/hr relative to the water (measured while rowing on a still lake) and wants to reach the opposite shore directly across from the start point - along a line at 90 degrees with respect to the river shore . At what angle with respect to this line does the person have to point the boat (sheet 15 to 16")? Indicate with a negative (positive) sign whether the boat has to be pointed upstream (downstream).

How to solve:

Question 3: (1 point)

A football is kicked from level ground and lands after 4.659 s at a distance of 52.48 yards from the kicker. What is the horizontal component of the velocity with which the ball leaves the kicker's foot (sheet 17,19, drawing in 21 helps)?

How to solve:

Question 4: (1 point)

A football is kicked from level ground and lands after 1.067 s back on the ground. What is the risetime of the ball (the time when the maximum height is reached) (see sheet 23, Ch2)?

How to solve:

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 point in km does the person reach the opposite shore if the river is 0.1771 km wide (sheet 13, similar to 15, but figure on the right on sheet 16"' is relevant )?

How to solve:

Question 2: (1 point)

A person in a rowboat crosses a river which flows with 3.367 km/hr. The person rows with maximum velocity of 7.743 km/hr relative to the water (measured while rowing on a still lake) and wants to reach the opposite shore directly across from the start point - along a line at 90 degrees with respect to the river shore . At what angle with respect to this line does the person have to point the boat (sheet 15 to 16")? Indicate with a negative (positive) sign whether the boat has to be pointed upstream (downstream).

How to solve:

Question 3: (1 point)

A football is kicked from level ground and lands after 4.659 s at a distance of 52.48 yards from the kicker. What is the horizontal component of the velocity with which the ball leaves the kicker's foot (sheet 17,19, drawing in 21 helps)?

How to solve:

Question 4: (1 point)

A football is kicked from level ground and lands after 1.067 s back on the ground. What is the risetime of the ball (the time when the maximum height is reached) (see sheet 23, Ch2)?

How to solve:

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