.
Gravity
7. (28) Calculate the force of earth's gravity on a spacecraft 12,800 km (2 earth radii) above the earth's
surface if it's mass is 1350 kg.
b) Calculate its ac
c) Calculate its velocity
8. (29) At the surface of a certain planet, the gravitational acceleration g has a magnitude of 12.0 m/s².
A 21kg brass ball is transported
to this planet, what is
a) The mass of the brass ball on the earth and on the planet?
b) The weight of the brass ball on the earth and on the planet?
9. (30) Calculate the acceleration due to gravity on the moon. The moons radius is 1.74 x 106 m and its
mass is 7.35 x 1022 kg. Hint:
remember the equation for "g".