Question

1. Which of the following facts best explain why it is hotter in the summer and colder in the winter?

a) Kepler’s laws

b) Newton’s universal law of gravity

c) the Earth has an elliptical orbit around the sun

d) the Earth’s axis is tilted

2. Planet X has three times the mass of the Earth and half the radius. What is the acceleration of an object in free fall on Planet X?

a) 14.7 m/s^{2}

b) 29.4 m/s^{2}

c) 58.8 m/s^{2}

d) 117.6 m/s^{2}

3. What is the force of gravity between a 1000 kg car and a 2000 kg truck when they are 2.0 m apart?

a) 3.34 x 10^{–5} N

b) 6.67 x 10^{–5} N

c) 1.33 x 10^{–4} N

d) 1.96 x 10^{–4} N

4. A 1000 kg rocket orbits the Earth (mass 5.97 x
10^{24} kg) at a radius of 1.5 x 10^{7} m. How fast
is it traveling?

a) 5.15 x 10^{–8} m/s

b) 6.67 x 10^{–8} m/s

c) 5.15 x 10^{3} m/s

d) 6.67 x 10^{3} m/s

5. A 1000 kg rocket orbits the Earth (mass 5.97 x
10^{24} kg) at a radius of 1.5 x 10^{7} m. What is
the total energy of this system?

a) –2.65 x 10^{10} J

b) –1.33 x 10^{10} J

c) 1.33 x 10^{10} J

d) 2.65 x 10^{10} J

Answer #1

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