Physicshard · Past Paper
If the mass of a planet is 4 times Earth's mass and its radius is 2 times Earth's radius, what is 'g' on that planet?
Ag_earth
B2 g_earth
C0.5 g_earth
D4 g_earth
✓ Correct Answer: A — g_earth
g = GM/R^2. New g' = G(4M)/(2R)^2 = 4GM/4R^2 = GM/R^2 = g_earth.
Share this question
More from Physics
- The frequency of a source of sound is 10 Hz. How many times does it vibrate in 1 minute?
- If you are standing 100 meters away from a mountain and you shout, how much time will it take for the echo to reach you? (Speed of sound = 340 m/s)
- What is the unit of the Universal Gravitational Constant G?
- A person claps their hands near a high wall and hears an echo after 2 seconds. If the speed of sound is 340 m/s, how far is the wall?
- What is the SI unit of electric charge?