Multiple choice quest.

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.

Angular momentum

Group of answer choices:

is definitely conserved.

is definitely not conserved.

may or may not be conserved.

none of the above

2. The figure shows a distance vs. time graph of an object with three distinct regions, I, II, and III.

The object's velocity is positive in region(s) what?

The object's speed is greatest in region(s) what?

The object's velocity is positive in region(s) what?

3.The figure shows the distance versus time graph of an object.

The acceleration of the moving object is?

zero.

constant.

increasing.

decreasing.

not determinable.

4.

The acceleration of a ball as it rolls down a ramp is 4 m/s².The distance (in meters) from the starting point 2 s after it starts to roll is:

0.

2.

4.

8.

16.

5.

When a body moves in circular motion at constant speed

Group of answer choices

the velocity and acceleration point in the same direction.

the velocity and acceleration point in opposite directions.

the velocity and acceleration point perpendicular to each other.

the acceleration is zero.

none of the above.

6.

A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up-and-down motion.

The velocity

Group of answer choices

is zero.

has its largest magnitude.

points up.

points down.

7.

Two forces of 4 N and 12 N act on a body simultaneously. The net force on the body is?

4 N.

12 N.

16 N.

8 N.

impossible to tell from the given information.

8.

A ball is thrown straight up, and reaches the top of its trajectory. The acceleration at the top of the trajectory is:

Group of answer choices

cannot be determined without additional information.

9.8 m/s²upward.

9.8 m/s² downward

0 m/s²

9.

A 188-pound astronaut in a training exercise experiences an acceleration of 7.2 g's.What is the net force (in newtons) acting on the astronaut?

Group of answer choices

1,353.6 N

6,023.5 N

59,030.5 N

13,536 N

10.

As a body falls through air starting from rest, its velocity

Group of answer choices

stays constant.

continuously decreases.

continuously increases.

gets larger and larger, eventually reaching a constant value.

gets smaller and smaller, eventually approaching zero.

11.

Kinetic energy is conserved in

Group of answer choices

an inelastic collision.

an elastic collision.

any collision where two objects rebound off each other.

none of the above.

12. Consider a situation where two moving objects collide, stick to each other, and move off together.

Kinetic energy is?

is definitely conserved.

is definitely not conserved.

may or may not be conserved, depending on the nature of the collision.

none of the above

13.

Consider a situation where you carry a 20-N box up a flight of stairs, raising its elevation by 5 m.

The work you do is

Group of answer choices

0.

4 J.

100 J.

none of the above.

14.

The linear momentum of a truck will be greater than that of a bus if

Group of answer choices

the truck's mass is larger than the bus's but its speed is the same.

the truck's speed is larger than the bus's but its mass is the same.

the truck's mass and speed are both larger than the bus's.

any of the above.

15.

About how many 100-W light bulbs would you have to light up to use energy at the rate of one horsepower?

one or two

seven or eight

the question doesn't make sensehp and W are unrelated

dozens

none of the above

16. A person slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J.

He slides all the way down to the valley bottom where his gravitational potential energy becomes zero. His kinetic energy at the bottom will be?

0 J.

500 J.

some value between 0 and 500 J.

none of the above.

Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up.

Angular momentum?

is definitely conserved.

is definitely not conserved.

may or may not be conserved.

none of the above