Physics help from experts.

## QUIZ

### Gravitational Field

#### Instructions

1. What is the gravitational field (in N/kg) Earth radii above the Earth's surface?

2. What is the gravitational field (in N/kg) km above a planet with a mass of x 1022 kg and a radius of x 106 m?

3. An astronaut standing on the surface of the moon launches a projectile straight up from the surface. What should the initial speed (in m/s) of the projectile be so that it will reach a height of x 106 m above the moon's surface? (The moon's mass is 7.35 x 1022 kg and its radius is 1.74 x 106 m.)

4. What is the escape velocity (in m/s) from a planet with a radius of x 106 m and a mass of x 1022 kg?

5. How much work (in kJ) is done lifting a kg payload from the Earth's surface to a height of m above the Earth's surface? (The mass of the Earth is 5.98 x 1024 kg and the Earth's radius is 6.38 x 106 m.)

6. How much work (in MJ) is done to raise a kg payload from Earth's surface to a height of x 106 m above the Earth's surface? (The mass of the Earth is 5.98 x 1024 kg and the Earth's radius is 6.38 x 106 m.)