Physics 201 October 4, 2001 name____________________

1) A section of land has an area of 1 square mile and contains 640 acres. Determine the number of square meters in 1 acre. 1 mile = 1601 meters.

2) A vase falls from rest from a window that is 6.2 m above the ground.

a) What is the vases speed as it hits the ground?

b) How long does it take for the vase to hit the ground?

c) How far has the vase fallen after 0.5s?

d) What is the vases speed after 0.5s?

e) What is the vases acceleration after 0.5s (trick question)?

3) An bird descending towards a lake is moving at 10 m/s at an angle of 60^o below horizontal. If the sun shines directly overhead, how fast is the bird's shadow moving along the ground?

4) Two forces act on the object as shown in the diagram.

a) What are the x and y components of each force?

b) What is the sum of these two vector forces (give the magnitude and direction of the new vector)?

5) A brick is thrown upward from the top of a building with a speed of 15 m/s at an angle of 25^o.

a) What are the x and y components of the initial velocity?

b) What is the y acceleration?

c) What is the x acceleration?

d) What are the x and y velocities after 2s?

e) At what angle is the brick traveling after 2s?

f) If the brick is in flight for 3s, how tall is the building?

Bonus:

a) A plane releases a bomb and continues to travel at the same speed. Where is the plane relative to the bomb when the bomb hits the ground?

b) Describe the motion which would lead to the following graph on a TI graphing calculator with a LabPro motion sensor attached.

c) A person in a moving car throws a ball straight upwards. What does the path of the ball look like from outside the car?