Physics C Gravity Questions

Two moons of equal mass are in circular orbits around a planet. Moon 1 orbits with a radius r and Moon 2 orbits with a radius 3r. What is the ratio of the gravitational force of planet on Moon 1: gravitational force on planet to Moon 2?

 $\frac{F\ on\ 1}{F\ on\ 2}$  ?

• 9/1

• 1/3

• 3/1

• 1/9

Tags

NGSS.HS-PS2-4

A comet moves in an elliptical orbit around the sun. Which of the following is a maximum when the comet is at its further distance from the Sun?

• Speed of the comet

• Acceleration of the comet

• Gravitational potential energy of the Sun-comet system

• Total energy of the Sun-comet system

Tags

NGSS.HS-ESS1-4

Identical satellites X and Y of mass m are in circular orbit around a planet of mass M and radius R. Satellite X has an orbital radius of 3R, and Y has one of 3R. The kinetic energy of satellite X is K. What is the gravitational potential energy of the planet-satellite X system?

• -2K

• -K

• -K/2

• K/2

Tags

NGSS.HS-PS2-4

Identical satellites X and Y of mass m are in circular orbit around a planet of mass M and radius R. Satellite X has an orbital radius of 3R, and Y has one of 3R. The kinetic energy of satellite X is K. What is the kinetic energy of satellite Y?

• K/4

• 3K/4

• K

• 4K/3

Tags

NGSS.HS-ESS1-4

NGSS.HS-PS2-4

Identical satellites X and Y of mass m are in circular orbit around a planet of mass M and radius R. Satellite X has an orbital radius of 3R, and Y has one of 3R. The kinetic energy of satellite X is K. Satellite X is moved to the same orbit as satellite Y by a force doing work. What is the work done on the satellite?

•  $\frac{GMm}{24R}$  

•  $-\frac{GMm}{24R}$  

•  $-\frac{7GMm}{12R}$  

•  $\frac{7GMm}{12R}$  

Tags

NGSS.HS-ESS1-4

NGSS.HS-PS2-4

NGSS.HS-PS3-1

A projectile is launch from the surface of a planet with a mass M and radius R. What minimum launch speed if required if the projectile is to rise a height of 4R above the surface of the planet?

• $\sqrt{\frac{4GM}{3R}}$

• $\sqrt{\frac{8GM}{5R}}$

• $\sqrt{\frac{4GM}{5R}}$

• $\sqrt{\frac{3GM}{4R}}$

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

That’s no moon. That’s a massive rod in space of mass and length as shown in the diagram. The rod lies along the y-axis, with its center at the origin. A small point mass of mass m lies along the x-axis a distance of away. Which of the following expression would, when evaluated give the force of gravity between the two objects?

• 
• 
• 
• 

Tags

NGSS.HS-PS2-4