Exam 1 Target 7 Preap Numbers 21-25
.
- 1.21. A baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the mitt. At what point in the ball’s path does it experience zero velocity and nonzero acceleration at the same time?
- A.
a. midway on the way up
- B.
b. at the top of its path
- C.
c. the instant it leaves the catcher’s hand
- D.
d. the instant before it arrives in the catcher’s mitt
- 2.22. Acceleration due to gravity is also called
- A.
A. negative velocity.
- B.
B. free-fall acceleration.
- C.
C. displacement.
- D.
D. instantaneous velocity.
- 3.23. Objects that are falling toward Earth in free fall move
- A.
A. faster and faster.
- B.
B. at a constant velocity.
- C.
C. slower and slower.
- D.
D. slower then faster.
- 4.24. An object in free fall
- A.
A. experiences no air resistance.
- B.
B. undergoes a downward acceleration.
- C.
C. has an acceleration with a magnitude of 9.81 m/s2 near Earth’s surface.
- D.
D. all of the above
- 5.25. When there is no air resistance, objects of different masses dropped from rest
- A.
A. fall with equal accelerations and with equal displacements.
- B.
B. fall with different accelerations and with different displacements.
- C.
C. fall with equal accelerations and with different displacements.
- D.
D. fall with different accelerations and with equal displacements.
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