QUESTION 1 A planet Y is moving in circular orbit around the Sun. If its distance from the Sun is four times the average distance of the Earth from the Sun, what is the Y's period in Earth years? 03 O O 32 O 64 QUESTION 2 Two masses are precisely 1 m apart from each other. The gravitational force each exerts on the other is exactly 1 N. If the masses are identical, what is each mass? 1.22 x 103 kg 1.34 x 10 kg 2.50 x 109 ka 1.58 x 1010 kg QUESTION 3 What is the acceleration due to gravity on the surface of the planet Pluto if its mass is 1.2 x 10-- kg and radius is 1.14 x 10 m? 6.4 mis O 0.62 my=2 0.34 mys2 QUESTION 4 The distance between a spaceship and the center of the Earth increases from 1.5 Earth radii to 3.0 Earth radii. By what factor does the force of gravity acting on the spaceship change? 0 0.25 0 4.0 0 0.50 O 2.0 O none of them QUESTION 5 The radius of a planet is three times that of Earth and its mass is nine times that of Earth. The acceleration due to gravity on this planet is times the acceleration due to gravity on Earth. 03 01 O O none of themQUESTION 6 What is the gravitational force between two identical bodies with a mass of 2.0 x 10" kg each if they are 2.0 m apart? 5.7 x 10"-N 1.3 x 10-2N 0 6.7 x 10- N O 1.2 x 10 N QUESTION 7 Two point masses are placed 10.0 om apart and attract each other with a force of 10.0 N. Find the force of gravitational attraction between the masses when they are placed 5.00 om apart. O 3.00 N O 4.50 N O 20.0 N O 40.0 N QUESTION & The radius of the orbit of a certain asteroid is four astronomical units. What is the period (in years) of this asteroid? 2 years 4 years 6 years 8 years QUESTION 9 A satellite is orbiting the earth at an altitude where the acceleration due to gravity is 8.70 m's-. What is its speed? 2.65 x 10 m/'s 7.45 x 10# m/s O 7.68 x 10# m/s O 7.91 x 10# mis QUESTION 10 Two bodies, masses my and my, attract each other with force F. If one of the masses is doubled, the new gravitational force will be: O 2F 0 4F QUESTION 11 The value of g at an altitude above Earth equal to one Earth diameter is: 9.8 mis2 4.9 m/2 2.5 mis2 0 1.9 mis2 0 1.1 m/s2QUESTION 12 The escape velocity at the surface of Earth is 11 kim's. What is the escape velocity at the surface of a planet whose radius is 4 times and whose mass is 100 times that of Earth? O 1.60 km's 8 km's 55 km's O 200 km's O none of the above