Physics Midterm

12. As the student slowly increased the ramp angle, the component of the force of gravity acting on the block parallel (down the ramp) to the ramp ____________

A. first increased, then decreased.

B. first decreased, then increased.

C. increased.

D. decreased.

E. remain unchanged

13. If the block slides down the ramp at a constant speed for an angle of 40°, what is the force of kinetic friction between the block and the ramp?

A. 89. N

B. 75. N

C. 63. N

D. 57. N

E. 48. N

14. What is the coefficient of kinetic friction in this problem?

A. 0.12

B. 0.58

C. 0.64

D. 0.77

E. 0.84

26. Find the acceleration of the cart at t = 1.0 s.

A. 2.0 m/s²

B. –2.0 m/s²

C. 0 m/s²

D. 0.15 m/s²

E. -4.0 m/s²

27. Find the displacement of the cart from t = 2 s to t = 10 s.

A. –8.0 m

B. –4.0 m

C. 0.0 m

D. 4.0 m

E. 8.0 m

28. Find the average speed of the cart between t = 4 s to t = 10 s.

A. –4.0 m/s

B. –3.0 m/s

C. 0.0 m/s

D. 4.0 m/s

E. 2.7 m/s