Question
1. Lincoln is driving a remote controlled car around a circular track. The car is traveling at a constant speed of 8.3 m/s, and the
1.
Lincoln is driving a remote controlled car around a circular track. The car is traveling at a constant speed of
8.3
m/s, and the track has a radius of
9.6
m. What is the car's centripetal acceleration?
| 7.2 m/s
2 |
| 0.86 m/s
2 |
| 4.9 m/s
2 |
| 8.3 m/s |
2.
Many roller coasters begin with a motor pulling the carts to the top of a large hill. A larger initial hill allows the roller coaster to travel for a longer period of time. Why is this the case?
3.
The planet Neptune has a mass of
1.024
10
26
kg, and a radius of
24
,
620
km. An astronaut in a full suit has a mass of 195 kg. How much would this astronaut weigh on the surface of Neptune?
| 16 , 450 N |
| 1913 N |
| 12 , 710 N |
| 2199 N |
.
If a
885
N force is applied over an area of
0.655
m
2
, what is the pressure that is being exerted?
| 885 Pa |
| 1350 Pa |
| 2120 Pa |
| 580 Pa |
5.
A certain sheet of glass will break if it experiences a pressure greater than
1250
Pa. In order to place a
65
N weight on the glass sheet, over how large an area would the weight need to be distributed?
| 0.011 m
2 |
| 0.26 m
2 |
| 0.19 m
2 |
| 0.052 m |
6.
A communications satellite is orbiting Earth, and its orbit has a radius of
42
,
160
km. If the Earth has a mass of
5.97
10
24
kg, then what is the orbital period for the satellite?
| 8.19
10 6 s |
| 7.42
10 9 s |
| 86 , 200 s |
| 34 , 200 s |
7.
A fully loaded semi truck has a mass of
33
,
800
kg. If the truck is driving at a speed of
29.6
m/s, how much kinetic energy does the truck have?
| 2.96
10 7 J |
| 5.00
10 5 J |
| 2.44
10 6 J |
| 1.48
10 7 J |
.
Gino is pushing a box of football equipment back into storage. He pushes with a force of
454
N over a distance of
12.9
m. If the force and displacement vectors are in the same direction, how much work did Gino do on the box?
| 495 J |
| 5860 J |
| 0 J |
| 3610 J |
9.
Theodore is pulling a cart with a rope. Assuming he always pulls the rope with the same amount of force, which arrangement would allow him to most rapidly change the kinetic energy of the cart: pulling at
24
above horizontal, or
16
below horizontal? Explain your answer.
10.
When a spacecraft wants to change orbits, they can achieve this by adjusting their velocity. What effect would an increase in velocity have on the orbit of a spacecraft?
11.
Gordon is flying in a small, propeller-driven airplane. If the propeller is rotating at a rate of
2320
RPM, what is the period of rotation for the propeller?
| 37 s |
| 0.027 s |
| 0.11 s |
| 0.00045 s |
12.
An airplane is flying in a circular pattern. If the airplane traveling at a speed of
57.1
m/s, and it takes his
134
s to complete an entire circle, what is the radius of the circle the aircraft is tracing out?
| 4940 m |
| 7650 m |
| 1220 m |
| 2440 m |
13.
Jenna is pulling a sled with a rope. She pulls on the rope with a force of
44.5
N, at an angle of
20.0
above horizontal. If Jenna performs
865
J of work on the sled, how much distance does she cover?
| 22.4 m |
| 16.7 m |
| 20.7 m |
| 24.1 m |
14.
Two skyscrapers are located next to each other. One has a mass of
2.04
10
8
kg, and the other has a mass of
1.77
10
8
kg. Their respective centers of mass are a distance of
62.5
m apart. What is the force of the gravitational attraction between the two buildings?
| 38 , 600 N |
| 617 N |
| 2490 N |
| 7710 N |
15.
A team of astronomers discovers a new planet. They estimate that the planet has a mass of
8.98
10
25
kg, and a radius of
16
,
100
km. What is the acceleration of gravity at the surface of this newly discovered planet?
| 23.1 m/s
2 |
| 8.84 m/s
2 |
| 19.6 m/s
2 |
| 11.7 m/s |
16.
The wheel of a car is spinning with a period of
0.138
s. If the wheel has a radius of
0.343
m, what is the velocity of a point on the edge of the wheel?
| 9.15 m/s |
| 19.2 m/s |
| 13.4 m/s |
| 15.6m/s |
17.
Havilah is pushing a shopping cart with a force of
19.9
N, at angle of
16.1
downward from the horizontal. If she pushes the cart 9.55 m, how much work has she done on it?
| 165 J |
| 183 J |
| 190 J |
| 195 J |
18.
At sea level, the air pressure is
101
,
325
Pa. How much force is the air at sea level exerting on an area of
4.41
m
2
?
| 4.47
10 5 N |
| 7.68
10 4 N |
| 1.29
10 5 N |
| 2.3
10 4 N |
19.
Florence is spinning a
770
g weight tied to a string over her head. The string is
0.94
m long, and the weight is moving with a speed of 4.24 m/s. What is the centripetal force pulling the weight inward?
| 20.6 N |
| 19.7 N |
| 11.0 N |
| 14.7 N |
20.Earth's orbit is nearly circular. If, however, Earth's orbit were more elongated and elliptical, what other effects would that have on Earth's orbit?
21.
A certain type of centrifuge spins specimens by attaching them to a
0.4
m cable. If the specimen being spun has a mass of
250
g, and the cable is designed to fail at a force greater than
660
N, what is the maximum velocity the specimen can reach?
| 24.2 m/s |
| 29.1 m/s |
| 32.5 m/s |
| 16.0 m/s |
22.
In a circus stunt sometimes called a "globe of death," a motorcyclist rides inside of a spherical cage. When they are traveling fast enough, they exhibit uniform circular motion. What is causing the centripetal force that keeps them in uniform circular motion?
23.
An Olympic-size swimming pool has a length of
50.0
m, a width of
25.0
m, and contains
2.5
10
6
kg of water. What is the pressure that the water exerts on the floor of the pool?
| 2000 Pa |
| 7790 Pa |
| 8450 Pa |
| 19 , 600 Pa |
24.
A carnival ride spins riders in a circle. The ride operator does not want the centripetal acceleration on the ride to exceed
19.62
m/s
2
. If the radius of the ride is
5.50
m, what is the maximum speed the riders can achieve, and stay under the acceleration limit?
| 25.1 m/s |
| 3.57 m/s |
| 10.4 m/s |
| 108 m/s |
25.
Lindsay is in an airplane, preparing to skydive. Lindsay has a mass of
71.1
kg, and the airplane is flying at an altitude of
3620
m above the ground. Before she jumps from the airplane, how much gravitational potential energy does he have?
| 2.52
10 6 J |
| 6.44
10 5 J |
| 2.57
10 5 J |
| 1.90
10 6 J |
26.
Robert is riding his skateboard around a skate park. At the top of one feature, he has
475
J of kinetic energy, and
2240
J of gravitational potential energy. Ignoring friction, how much total energy will Robert have when he is at the bottom of the feature.
| 2715 J |
| 2240 J |
| 475 J |
| 1765 J |
27.
On a certain planet, a
4950
kg rock weighs
22
,
030
N. If this planet has a radius of
4200
km, what is the mass of the planet?
| 1.92
10 25 kg |
| 1.18
10 24 kg |
| 4.51
10 24 kg |
| 3.06
10 25 kg |
28.
One of Saturn's moons orbits with a period of approximately
2.7
days. If Saturn has a mass of
5.68
10
26
kg, then what is the orbital radius of this moon?
| 8.76
10 10 m |
| 5.23
10 25 m |
| 6.29
10 16 m |
| 3.74
10 8 m |
28.
One of Saturn's moons orbits with a period of approximately
2.7
days. If Saturn has a mass of
5.68
10
26
kg, then what is the orbital radius of this moon?
| 8.76
10 10 m |
| 5.23
10 25 m |
| 6.29
10 16 m |
| 3.74
10 8 m |
29.
Leslie is packing up her items to move. One box has a weight of
340
N. The base of the box is
0.36
m
2
. What is the pressure exerted by the box on the floor?
| 120 Pa |
| 360 Pa |
| 340 Pa |
| 940 Pa |
30.
A
815
kg roller coaster cart is at rest at the top of a
51.2
m hill. When the cart reaches the bottom of the hill, how quickly will it be moving?
| 21.5 m/s |
| 30.0 m/s |
| 31.7 m/s |
| 28.2 m/s |
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