Question

1) A 3.00 g bullet traveling horizontally at 400 m/s hits a 3.00 kg wooden block which is initially at rest on a smooth horizontal table. The bullet buries itself in the block without passing through. The speed of the block after the collision is

a) 0.4 m/s.

b) 1.2 m/s.

c) 2.0 m/s.

d) 2.8 m/s.

e) 3.6 m/s.

2) What type of collision was seen in the previous problem?

a) elastic collision

b) inelastic collision

c) perfectly elastic collision

d) perfectly inelastic collision

3) A cubic meter (m3) of water has a mass closest to

a) 1 kg

b) 10 kg

c) 100 kg

d) 1000 kg

e) 9800 N

4) Two objects are in direct contact with each other. Object A is currently at a temperature of20 oc, while object B is at 90 oc. Which of the following correctly indicates the direction of heat flow, and the method of heat transfer?

a) A to B; convection

b) A to B; conduction

c) B to A; convection

d) B to A; conduction

e) Heat does not flow in this situation

5) A 9.3 kg object is dropped from a height of 3.2 m above the ground. How much kinetic energy does it have just before it hits the ground?

b) 7.92 J

c) 29.76 J

d) 31.36 J

e) 291.6 J

6) You are throwing a ball straight up in the air. At its highest point, the ball's

a) velocity and acceleration are both zero

b) velocity is nonzero but its acceleration is zero

c) acceleration is nonzero but its velocity is zero

d) velocity and acceleration are both nonzero

7) Voltage is a term that we use to represent a change in

a) temperature

b) electric potential energy

c) voltage

d) electric potential

e) charge

8) An impulse of 5.0 kg m/s acts on a crate. Which of the following is an equivalent value for this impulse?

a) 5.0 x 104 g cm/s

b) 5.0 x 105 g cm/s

c) 5.0 x 106 g cm/s

d) 5.0 x 107 g cm/s

e) 5.0 x 108 g cm/s

Answer 1