Question

1) From the top of a very tall cliff, you throw a pebble straight down with an initial speed of 12.0 m/s. How fast is the pebble moving 3.0 seconds later?

a) 17.4 m/s

b) 29.4 m/s

c) 41.4 m/s

d) 80.1 m/s

e) Impossible to say without knowing the distance it's traveled

2) Which of the following is not a vector quantity?

a) velocity

b) acceleration

c) mass

d) momentum

e) force

3) Maggie travels west at constant velocity. The net force on Maggie is

a) east

b) west

c) up

d) down

e) zero

4) A box weighing 50 N sits on the floor. If each side of the box is 20 cm long, what is the pressure between the box and the floor? a)

b) 10 Pa

c) 50 N

d) 250 Pa

e) 1250 Pa

5) Which of the following is not an example of a conservative force?

a) gravitational force/weight

b) spring force

c) friction force

d) electric force

e) all of these are conservative forces

6) Two objects are in thermal equilibrium. This means that they

a) have the same specific heat

b) have the same latent heat

c) are in contact with each other

d) have the same temperature

e) have the same heat

7) Which of the following statements is not true?

a) The total work done to an object changes that objects kinetic energy.

b) A net force acting over a time exerts an impulse on an object.

c) A net force acting over a distance does work to an object.

d) An impulse exerted on an object changes that objects momentum.

e) All of the above are true statements.

Answer 1