Μηχανική

14 Νοε 2013 (πριν από 4 χρόνια και 5 μήνες)

102 εμφανίσεις

AP PHYSICS

Kinematics Intro: Basic Kinematics Review NAME: _____________

1.

A person wants to measure the height of a tree. The person throws a ball straight up to the top of the
tree. He then catches the ball. The person c
ounts for 3 seconds until the ball lands back into his
hands. How tall is the tree?

2.

Two Vehicles with bodies in the trunks are drag racing. Vehicle 1 takes 9 seconds to accelerate to 45
m/s then travels at this constant velocity. Vehicle 2 takes
4 seconds to accelerate to 40 m/s, and then
travels at this constant velocity. The drag race track is 500 m long. Which car will win?

3. A swimmer attempts to swim across a 150 m wide river. The person starts swimming directly toward
the shor
e on the opposite side of the river. However, there is a current pushing the swimmer downstream.
It takes the person 2.5 minutes to cross the river. When the swimmer crosses, he notices that he has been
swept 70 m downstream.

A)

What is the velocity of the

river current?

B)

What was the velocity of the swimmer in the direction of the shore?

C) What was the resultant velocity of the swimmer?