physics
posted by anonymous .
1. Calculate the speed in m/s at which the Earth revolves about the sun. You may assume the orbit is nearly circular.
2. A satellite is about 6.5 x 10^3 km from the (center of the) Earth. Find its average orbital speed about the Earth.
3a. A certain satellite has a kinetic energy of 8 billion joules at perigee (closest to Earth) and 7 billion joules at apogee (farthest from Earth). As the satellite travels from apogee to perigee, how much work does the gravitational force do on it?
3b. Does its potential energy increase or decrease during this time, and by how much? (Enter a positive answer if the energy increases, and a negative answer if the energy decreases.)

physics 
vinay
2.96 x 10^4 m/s
Respond to this Question
Similar Questions

Physics
Consider the earth following its nearly circular orbit about the sun. The earth has mass 5.98*10^24 and the sun has mass 1.99*10^30. They are separated, center to center, by r=150 million k. What is the size of the gravitational force … 
physics
Two Earth satellites, A and B, each of mass m, are to be launched into circular orbits about Earth's center. Satellite A is to orbit at an altitude of 7460 km. Satellite B is to orbit at an altitude of 20500 km. The radius of Earth … 
physics
Two Earth satellites, A and B, each of mass m, are to be launched into circular orbits about Earth's center. Satellite A is to orbit at an altitude of 7460 km. Satellite B is to orbit at an altitude of 20500 km. The radius of Earth … 
fizik asas
The earth travels in a nearly circular orbit about the sun. The mean distance of the earth from the sin is 1.5¡Á1011 m. What is the approximation speed of the earth in its orbit around the sun? 
Physics
A communications satellite with a mass of 400 is in a circular orbit about the Earth. The radius of the orbit is 3.7×104 as measured from the center of the Earth. Calculate the gravitational force exerted on the satellite by the Earth … 
Physics
A communications satellite with a mass of 450 kg is in a circular orbit about the Earth. The radius of the orbit is 2.9×10^4 km as measured from the center of the Earth. Calculate the weight of the satellite on the surface of the … 
College Physics
A satellite in an elliptical orbit has a speed of 9.00km/s when it is at its closes approach to the Earth(perigee). The satellite is 7.00x10^6 m from the center of the Earth at this time. When the satellite is at its greatest distance … 
Physics
Calculate the speed in m/s at which Earth revolves about the Sun. You may assume the orbit is nearly circular. 
Physics
Consider the earth following its nearly circular orbit (dashed curve) about the sun.(Figure 2) The earth has mass mearth=5.98×1024kg and the sun has mass msun=1.99×1030kg. They are separated, center to center, by r=93millionmiles=150millionkm. … 
physics
A satellite is in a circular orbit around the Earth at an altitude of 3.30 106 m. (a) Find the period of the orbit. (Hint: Modify Kepler's third law so it is suitable for objects orbiting the Earth rather than the Sun. The radius of …