V. A worker is exerting a force F on a hydraulic press to raise a car of 1000 kg in mass at a constant rate. The cross sectional area of the pistons at the worker's side and the car's side is respectively 0.01m2 and 0.5 m2. What is F ?

A. 1000N

B. 9800N

C. 196N

D. 490000N

E. 1960N

Ans. C

 

VI. Two satellites A and B of the same mass are going around Earth in concentric orbits. The distance of satellite B from Earth's center is two times that of satellite A. What is the ration of the tangential speed of B to that of A?

A. 

B. 2

C. 

D. 

E. None of above

Ans. D

VII. Assuming upward direction as the positive direction. A ball is thrown straight up in the air, at the very top its

A. velocity is negative, but not zero.

B. velocity is positive, but not zero.

C. acceleration is zero.

D. acceleration is + 9.8 m/s2.

E. acceleration is -9.8 m/s2.

Ans. E

VIII. Which of the following can best be described as an elastic collision?

A. A falling tree hitting the earth.

B. A linebacker stopping a fullback.

C. A golf club striking a golf ball.

D. A pie hitting the face of Bill Gates.

E. A falling beanie baby hitting the floor.

Ans. C