Question
A water wheel rotates with a period of 2.26 s. If the water wheel has a radius of 1.94 m, what is the velocity of
A water wheel rotates with a period of
2.26
s. If the water wheel has a radius of
1.94
m, what is the velocity of a point on the edge of the wheel?
| 5.39 m/s |
| 5.84 m/s |
| 6.15 m/s |
| 6.20 m/s |
2.
Claire is setting up a
1070
N bird bath on her lawn. If the pressure on the lawn exceeds
5450
Pa, the soil will shift and compact, making the bird bath unstable. What is the minimum area over which the bird bath's weight should be distributed to avoid compacting the soil too much?
| 0.196 m
2 |
| 5.09 m
2 |
| 1.16 m
2 |
| 0.844 m |
3.
If a
11
,
250
N force is applied over an area of
3.122
m
2
, what is the pressure that is being exerted?
| 11 , 250 Pa |
| 19 , 980 Pa |
| 35 , 120 Pa |
| 3603 Pa |
4.
Ronald is pushing a shopping cart with a force of
16.0
N, at angle of
11.5
downward from the horizontal. If Ronald pushes the cart
14.9
m, how much work has he done on it?
| 2110 J |
| 744 J |
| 189 J |
| 234 J |
5.
Clara is pushing a broken down car. She pushes with a force of
625
N, and is able to move the car a distance of
18.8
m. If the force and displacement vectors are in the same direction, how much work did Clara do on the car?
| 2240 J |
| 33.2 J |
| 11 , 800 J |
| 0 J |
6.
On a certain planet, a
145
kg rock weighs
2378
N. If this planet has a mass of
3.85
10
25
kg, what is the radius of the planet?
| 19 , 600 km |
| 17 , 400 km |
| 23 , 900 km |
| 12 , 500 km |
7.
Cody is at the top of a
6.2
m tall slide. He has a mass of
35
kg. Before he begins moving, how much gravitational potential energy does he have?
| 2100 J |
| 340 J |
| 1100 J |
| 220 J |
8.
The planet Neptune has a mass more than
17
times greater than Earth's, but the gravity at the surface of Neptune is similar to Earth's:
11.15
m
s
2
. What attributes of Neptune would account for this?
9.
The planet Mercury has a mass of
3.30
10
23
kg, and a radius of
2440
km. How much would a
924
kg robotic rover weigh on the surface of Mercury?
| 3420 N |
| 9060 N |
| 5640 N |
| 12 , 200 N |
10.
An asteroid is headed towards a certain planet. The planet has a mass of
2.33
10
27
kg, and a radius of
70
,
400
km. What is the acceleration of gravity that the asteroid will experience when it is about to crash into the surface of the planet?
| 14.6 m/s
2 |
| 28.3 m/s
2 |
| 31.4 m/s
2 |
| 19.9 m/ |
11.
A
694
kg roller coaster cart is at rest at the top of a
49.9
m hill. When the cart reaches the bottom of the hill, how quickly will it be moving?
| 38.0 m/s |
| 26.4 m/s |
| 36.9 m/s |
| 31.3 m/s |
12.
Dakota is spinning a
400
g weight tied to a string over her head. The string is
1.38
m long, and the weight is moving with a speed of
3.91
m/s. What is the centripetal force pulling the weight inward?
| 8.44 N |
| 4.43 N |
| 2.16 N |
| 1.13 N |
13.
Monique is pulling a wagon with a rope. She pulls on the rope with a force of
68.0
N, at an angle of
33
above horizontal. If Monique performs
1840
J of work on the wagon, how much distance does she cover?
| 29 m |
| 24 m |
| 18 m |
| 32 m |
14.
The International Space Station (ISS) experiences something called orbital decay, causing the ISS to get
90
m closer to Earth every hour. What effect does orbital decay have on the velocity and orbital period of the ISS?
15.
Jonas throws a ball up into the air. On its trip upward, the ball's velocity goes from
9.1
m/s to
0
m/s. On its trip downward, the ball's velocity goes from
0
m/s to
9.1
m/s. Did gravity do any work on the ball during the trip upward? Did gravity do any work on the trip downward? Justify your answer.
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