**Q3: **

What is the speed needed to escape from the Earth-Moon system from a point on the
surface of Earth? Assume there are no other bodies involved and do **not** account for
the fact that Earth and the Moon are moving in their orbits. Use a value of
km for the
distance between the centers of the Moon and Earth, kg for
Earth’s mass, and kg for the Moon’s mass.

- A m/s
- B m/s
- C m/s
- D m/s
- E m/s

**Q4: **

The distance from a solar system to the center of the Milky Way is 27 000 light years. Assume that the mass contained in the sphere of radius 27 000 light years is 100 billion solar masses, taking one solar mass as kg. What is the escape velocity for the Milky Way from the position of this solar system?

**Q5: **

Find the escape speed of a projectile from the surface of Pluto. Use a value of kg for the mass of Pluto and km for its diameter.

- A m/s
- B m/s
- C m/s
- D m/s
- E m/s

**Q6: **

What is the Schwarzschild radius for the black hole at the center of our galaxy if it has the mass of kg solar masses? Use kg as the value of the Sun’s mass.

- A km
- B km
- C km
- D km
- E km

**Q7: **

A planetoid has a mass of kg and a radius of 963.0 km. Find the magnitude of the escape velocity from the surface of the planetoid, considering it to be spherical.

**Q8: **

What would the Schwarzschild radius be if our Milky Way galaxy of 120 billion solar mass collapsed into a black hole? Use a value of kg for the mass of the Sun.