Two satellites are in circular orbits around Earth. Satellite A has speed vA . Satellite B has an orbital radius nine times that of satellite A. What is the speed of satellite B? Read More >

Find the net gravitational force on a 2.0 kg sphere midway between a 4.0 kg sphere and a 7.0 kg sphere that are 1.2 m apart. Read More >

The distance from earth to sun is 1.0 AU. The distance from Saturn to sun is 9 AU. Find the period of Saturn’s orbit in years. You can assume that the orbits are circular. Read More >

A satellite circling Earth completes each orbit in 132 minutes. Find the altitude of the satellite. What is the value of g at the location of this satellite? Read More >

The Earth’s radius is 6.37 x 10^6 m. What is the radius of a planet that has the same mass as earth but on which the free-fall acceleration is 5.50 m/s2？ Read More >

A 3300-m-high mountain is located on the equator. How much faster does a climber on top of the mountain move than a surfer at a nearby beach? The earth’s radius is 6400 km. Read More >

A 1.5 kg object is located at a distance of 1.7 x105 m fr220m the center of a larger object whose mass is 7.4 x 10 kg. What is the size of the force acting on the smaller object? Read More >

Two identical satellites are placed in orbit, one orbits Mars, the second orbits Jupiter. The orbital speeds of each satellite are the same. Which satellite has a greater orbital radius? Read More >

The International Space Station has a mass of 4.2 x105 kg and orbits Earth at a distance of 4.0 x102 km above the surface. Earth has a radius of 6.37 x106 m, and mass of 5.97 x104 kg. Calculate… Read More >

The gravitational force that the moon exerts on Earth is often cited as the source for the tides we witness. However, the gravitational force the Sun exerts on Earth is over 100 times greater than the force the moon exerts on Earth. Why is the force from the moon credited for the tides, and not the force from the sun? Read More >

Imagine a hypothetical planet that has two moons. Moon #1 is in a circular orbit of radius R and has a mass M. Suppose Moon #2 has a mass M, equal to Moon #1 but has an orbital radius twice that of Moon #1, 2R. What is the ratio of the force the planet exerts on Moon #1 compared to the force the planet exerts on Moon #2. Read More >