1. A woman standing on the surface of the Earth has a mass of 70 kilograms and a weight of 686 N. If instead she is floating freely inside a nonrotating space habitat far from the Earth, her mass would be
a. Less than 70 kg
b. 70 kg
c. More than 70 kg.
2. and her weight would be
a. Less than 686 N
b. 686 N
c. More than 686 N.
3. A 400-N person stands on the surface of the Earth. If he were somehow able to stand on a ladder so that he was twice as far from the center of the Earth, he would weight
a. 0 N
b. 100 N
c. 200 N
d. 400 N
4. This would be because
a. He would be above the atmosphere
b. His mass would be the same wherever he was
c. Gravitational force obeys an inverse square law.
5. The Earth and the moon are attracted to each other by gravitational force. The larger Earth attracts the smaller moon with a force whose magnitude is
a. Smaller than that of the force which the moon exerts on the Earth
b. Greater than that of the force which the moon exerts on the Earth
c. The same as that of the force which the moon exerts on the Earth.
6. This is in accordance with
a. The law of inertia
b. Kepler's Law's
c. The conservation of energy
d. The fact that both moon and Earth orbit about a common point, the center of mass
e. The law of action and reaction.
7. High tides are predominately produced by the
a. Strong gravitational pull of the sun
b. Centrifugal force created by the Earth-moon orbit
c. Differences in gravitational pulls of the moon on opposite sides of the Earth.
8. Because
a. Of rotation of the Earth and moon about the sun
b. The moon pulls with a significantly greater force on the closer side of the Earth than on the side farther away.
c. The sun pulls the Earth with a force 200 times stronger than the gravitational pull of the moon.
9. The body chiefly responsible for ocean tides is the
a. Moon
b. Sun
10. chiefly because
a. The moon is closer to the Earth than the sun
b. Gravitational pull by the moon is less than that of the sun
c. The difference between the moon's pull on the near and far sides of the Earth is appreciable.
11. According to Kelper's laws, the paths of planets about the sun are
a. Parabolas
b. Circles
c. Straight lines
d. Ellipses
e. None of these.
12. According to Newton, the greater the masses of interacting objects, the
a. Less the gravitational force between them
b. Greater the gravitational force between them
c. Greater the force between them by the square of the masses.
13. According to Newton, doubling the distance between two interacting objects
a. Divides by 2 the gravitational force between them
b. Multiplies by 2 the gravitational force between them
c. Divides by 4 the gravitational force between them
d. Multiples by 4 the gravitational force between them.
14. What is the force of gravity on a 500-newton woman standing on the Earth's surface?
a. 50 N
b. 250 N
c. 500 N
d. 509.8 N
e. None of these
15. Inside a freely-falling elevator, there would be no
a. Gravitational force on you
b. Apparent weight for you
c. Both of these
d. None of these.
16. An asteroid exerts a 360-N gravitational force on a nearby spacecraft. This force is directed
a. Toward the asteroid
b. Away from the asteroid
c. Toward the sun.
17. If the radius of the Earth somehow decreased with no change in mass, your weight would
a. Increase
b. Not change
c. Decrease.
18. A very massive object A and a less massive object B move toward each other under the influence of gravitation. Which force, if either, is greater?
a. The force on A
b. The force on B
c. Both forces are the same.
19. The reason the moon does not crash into the Earth is that the
a. Earth's gravitational field is weak at the moon
b. Gravitational pull of other planets keeps the moon up
c. Moon has a sufficient tangential speed
d. Moon has less mass than the Earth
e. None of these.
20. How far must one travel to get away from the Earth's gravitational field?
a. To a region above the Earth's atmosphere
b. To a region well beyond the moon
c. To a region beyond the solar system
d. Forget it; you can't travel far enough.
21. Which pulls on the oceans of the Earth with the greater force?
a. The moon
b. The sun
c. Both pull the same.
22.The weight of an apple near the surface of the earth is 1 N. What is the weight of the earth in the gravitational field of the apple?
a) 1 N
b) 6 x 1024 N
c) 0 N
d) millions of millions of tons
23.The planet Jupiter is about 300 times more massive than the earth is. However, an object on the Jupiter weighs only about three times as much as the earth. The explanation for this is that
a) the Jupiter is 100 times smaller in radius than the earth is
b) the radius of Jupiter is about 10 times larger than the earth radius
c) the Jupiter being gaseous does not apply a full force on objects near its surface
d) the high temperature at the surface makes the force less effective
24. If you were in a freely falling elevator and you dropped a pencil, you’d see the pencil hovering. Is the pencil falling?
a) yes: it is falling at the same rate as the elevator
b) yes: it is falling, but it has much smaller acceleration because of its small mass
c) no: it is basically standing still exactly at the location it was released
d) no: it is actually going upward compared to the elevator
25. The value of g at the surface of the earth is 9.8m/s2. What is the value of g at a distance of twice the radius of the earth (from the center of the earth)?
a) 9.8 m/s2
b) 4.9 m/s2
c) 2.45 m/s2
d) 0 m/s2