PHY 111-While standing in a low tunnel, you raise your arms

Subject: Physics    / General Physics
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Question

1 of 20
While standing in a low tunnel, you raise your arms and push against the ceiling with a force of 100 N. Your mass is 70 kg. What force does the ceiling exert on you?
10 N
100 N
690 N
790 N
980 N

Question

2 of 20
While standing in a low tunnel, you raise your arms and push against the ceiling with a force of 100 N. Your mass is 70 kg. What force does the floor exert on you?
10 N
100 N
700 N
800 N
1000 N

Question

3 of 20
A 3-kg puck slides due east on a horizontal frictionless surface at a constant speed of 4.5 m/s. Then, a force of magnitude 6.0 N, directed north, is applied for 1.5 seconds. What is the northward component of the puck’svelocity after the force is applied?
0.50 m/s
2.0 m/s
3.0 m/s
4.0 m/s
4.5 m/s

Question

4 of 20
A 3-kg puck slides due east on a horizontal frictionless surface at a constant speed of 4.5 m/s. Then, a force of magnitude 6.0 N, directed north, is applied for 1.5 seconds. What is thespeed of the puck after the force is applied?
4.9 m/s
5.4 m/s
6.2 m/s
7.5 m/s
11 m/s

Question

5 of 20
Jeremy has a mass of 60 kg. He is standing on a scale in an elevator that is accelerating downward at 1.7 m/s/s. What is the approximate reading on the scale?
O N
400 N
500 N
600 N
700 N

Question

6 of 20
Certain SUV ads claim that their vehicles can climb a slope of 45º. What is the minimum coefficient of static friction between the tires and the road for this to be possible?
0.5
0.7
0.9
1.0
None of these

Question

7 of 20
A truck is traveling at 30 m/s on a slippery road. The driver slams on the brakes, and the truck start to skid. The coefficient of kinetic friction between the tires and the road is 0.20. How far will the truck skid before stopping?
230 m
300 m
450 m
24.5 km
None of these

Question

8 of 20
Two blocks are at rest on the surfaces shown in the diagram. What is the mass of Block B?
4.9 kg
6.1 kg
7.9 kg
9.8kg
12 kg

Question

9 of 20
A ball on a string moves around a complete circle once a second. The tension in the string is measured to be 6.0 N. What would the tension in the string be if the ball went around in 0.5 seconds?
1.5 N
3.0 N
12 N
24 N
None of the above

Question

10 of 20
Suppose the radius of the Earth doubled but its mass stayed the same. What would be the approximate new value for the free fall acceleration at the surface of the Earth?
2.5 m/s/s
5.0 m/s/s
10 m/s/s
20 m/s/s
None of the above

Question

11 of 20
A 10 kg box sits on a frictionless inclined plane with an angle of incline of 42o. What is the magnitude of theacceleration of the box?
The reference frame must be at rest.
8 .3m/s/s
7.4 m/s/s
6.7 m/s/s
10 m/s/s

Question

12 of 20
A 10-kg box sits on a frictionless inclined plane that has an angle of incline of 42o. What is the magnitude of thenormal force on the box?
83 N
74 N
67 N
100 N
79 N

Question

13 of 20
A 500 g golf ball swings in avertical circle at the end of a 1.5 m long string. When the ball is at the bottom of the circle, the tension in the string is 15 N. What is the speed of the ball at that point?
4.5 m/s
5.0 m/s
5.5 m/s
6.0 m/s
10 m/s

Question

14 of 20
A car drives over the top of a hill that has a radius of 50 m. What is the maximum speed the car can go without flying off the road at the top of the hill?
18 m/s
22 m/s
27 m/s
31 m/s
37 m/s

Question

15 of 20
Planet Z is 10,000 km in diameter. The free-fall acceleration on planet Z is 8.0 m/s/s. What is the mass of planet Z?
2.5 E 24 kg
3.0 E 24 kg
4.5 E 24 kg
6.0 E 24 kg
None of these

Question

16 of 20
Planet Z is 10,000 km in diameter. The free-fall acceleration on planet Z is 8.0 m/s/s. What is the free-fall acceleration (closest value) at 10,000 km above Planet Z’s north pole?
0.7 m/s/s
0.8 m/s/s
0.9 m/s/s
1.0 m/s/s
1.2 m/s/s

Question

17 of 20
A 20-kg sphere is at the origin and a 10-kg sphere is at (x, y) = (20 cm, 0 cm). At what point or points could you place a small mass such that the net gravitational force on it due to the spheres is zero?
(12 cm, 0 cm)
(-12 cm, 0 cm)
(12 cm, 6 cm)
(12 cm, -6 cm)
None of these

Question

18 of 20
A spacecraft orbits the moon in a very low, circular orbit, just a few hundred meters above the lunar surface. The moon has a diameter of 3,500 km, and the free-fall acceleration at the surface of the moon is 1.6 m/s/s. What is the direction of the net force on the spacecraft?
Away from the surface of the moon
In the direction of motion
Toward the center of the moon
Nonexistent, because the net force is zero
Not enough information to tell

Question

19 of 20
A spacecraft orbits the moon in a very low, circular orbit, just a few hundred meters above the lunar surface. The moon has a diameter of 3,500 km, and the free-fall acceleration at the surface of the moon is 1.6 m/s/s. How fast is the spacecraft moving (closest value)?
53 m/s
75 m/s
1,700 m/s
2,400 m/s
3,000 m/s

Question

20 of 20
A spacecraft orbits the moon in a very low, circular orbit, just a few hundred meters above the lunar surface. The moon has a diameter of 3,500 km, and the free-fall acceleration at the surface of the moon is 1.6 m/s/s. How much time does it take the spacecraft to complete one orbit (closest value)?
38 min
76 min
110 min
220 min
285 min