F4 : GRAVITATION QUIZ

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1. What is the gravitational force between the Earth and the Sun? (Mass of Earth : 5.98 x 10^24 kg, Mass of Sun : 1.99 x 10^30 kg, Radius of the Earth's orbit around the Sun : 1.50 x 10^11 m)

5 points

A. 5.29 x 10^-13 N

B. 3.53 x 10^22 N

C. 7.94 x 10^44 N

D. 5.29 x 10^33 N

Clear selection

2. According to Newton's Universal Law of Gravitation, the gravitational force between two masses...... *

5 points

A. is always

B. depends on how large the masses are

C. depends inversely on the square of the distance between the masses

D. all the above

3. Two balls near each other have a certain gravitational force. What happens to the force if you triple the distance? *

5 points

A. 9x bigger

B. 3x bigger

C. 3x smaller

D. 9x smaller

4. Suppose the gravitational force between two massive spheres is 20 N. If the magnitude of each mass doubles, then what is the force between the masses? *

5 points

A. 80 N

B. 20 N

C. 40 N

D. 5 N

5. Two students are sitting 1.50 m apart. One student has a mass of 70.0 kg and the other has a mass of 52.0 kg. What is the gravitational force between them? *

5 points

A. 1.08 x 10^-7 N

B. 1.08 x 10^-6 N

C. 1.08 x 10^-5 N

D. 1.08 x 10^-4 N

6. What is gravitational force does the moon produce on earth if their centers are 3.84 x 10^8 m apart? *

5 points

A. 1.99 x 10^10 N

B. 1.99 x 10^20 N

C. 1.99 x 10^30 N

D. 1.99 x 10^40 N

7. If the gravitational force between two objects of equal mass is 2.30 x 10^-8 N when the objects are 10.0 m apart, what is the mass of each object? *

5 points

A. 183 kg

B. 184 kg

C. 185 kg

D. 186 kg

8. Calculate the gravitational force on a mass of 6.50 x 10^2 kg that is 4.15 x 10^6 m above the surface of the Earth? (Mass of Earth : 5.98 x 10^24 kg, Radius of Earth : 6.38 x 10^6 m) *

5 points

A. 2340N

B. 2430 N

C. 2330 N

D.2440 N

9. The gravitational force between two objects that are 2.1 x 10^-1 m apart is 3.2 x 10^-6 N. If the mass of one object is 55 kg what is the mass of the other object? *

5 points

A. 35kg

B. 36 kg

C. 37 kg

D. 38 kg

10. If the two objects, each with a mass of 2.0 x 10^2 kg, produce a gravitational force between them of 3.7 x 10^-6 n. what is the distance between them? *

5 points

A. 0.84 m

B. 0.85 m

C. 0.86 m

D. 0.87 m

11. According to Keppler's 2nd Law, which section takes more time for the planet to travel? *

5 points

A. A

B. B

C. Same amount of time to travel

12. What does this mean about the relative speed of an orbiting body? *

5 points

A. the closer you are to the sun, the faster the speed in its orbit

B. the further you are to the sun, the faster the speed in its orbit

13. Kepler's First Law states that a planet moves on an ellipse around the Sun. Where is the sun with respect to that ellipse? *

5 points

A. The Sun is located at the end of major axis.

B. The Sun is located at one of the two focal points.

14. The Moon's distance between the Earth and the Sun is 1.5 x 10^11 m. The mean distance between the Sun and Mars is 2.287 x 10^11 m. what is the period of Mars around the Sun in Earth-Days? *

5 points

A. 687 days

B. 657 days

C.637 days

D. 617 days

15. The Earths's distance from the Sun is 149.6 x 10^6 km and period of the Earths's revolution is 1 year. By using Third Kepler's law, find k,constant in unit year^2/km *

5 points

A. 2.98 x 10^-23

B. 2.98 x 10^-24

C. 2.98 x 10^-25

D. 2.98 x 10^-26

16. Calculate the force of gravity that exist between Ahmad and Abu with 60 kg and 80 kg respectively who are 50 cm apart from each other. *

5 points

A. 1.28 x 10^-6 N

B. 1.38 x 10^-6 N

C. 1.48 x 10^-6 N

D. 1.58 x 10^-6 N

17. Calculate the force of gravity of a 25 kg block resting on the Earth. (Mass of the Earth, 5.97 x 10^24 kg and Radius of the Earth, 6.38 x 10^6 kg) *

5 points

A. 243 N

B. 244 N

C. 245 N

D. 246 N

18. What is the force gravity that is exerted on the Earth by the Sun? (The mass of the Sun and the Earth are 1.99 x 10^30 kg and 5.97 x 10^24 kg respectively. The distance between Earth and Sun is 1.496 x 10^11 m) *

5 points

A. 3.54 x 10^21 N

B. 3.54 x 10^22 N

C. 3.54 x 10^23 N

D. 3.54 x 10^24 N

19. Planet X and Planet Y have a mass of 3 x 10^24 kg and 4.5 x 10^25 kg. The gravitation of force between 2 planets is 3.6 x 10^20 N. How far apart is Planet x from Planet Y? *

5 points

A. 5.0 x 10^9 m

B. 6.0 x 10^9 m

C. 7.0 x 10^9 m

D. 8.0 x 10^9 m

20. Calculate the mass of the Sun using the earth-Sun mean distance of 1.5 x 10^11 m. *

5 points

A. 2.01 x 10^27 kg

B. 2.01 x 10^28 kg

C. 2.01 x 10^29 kg

D. 2.01 x 10^30 kg

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