Space debris left from old satellites and their launchers is becoming a hazard to other satellites. (a) calculate the speed of a satellite in an orbit 900 km above earth’s surface. (b) suppose a loose rivet is in an orbit of the same radius that intersects the satellite’s orbit at an angle of 90º relative to earth. what is the velocity of the rivet relative to the satellite just before striking it?

Part a)

Part b)

Explanation:

Part a)

As we know that orbital velocity at certain height from the surface of Earth is given as

here we know that

now we have

Part b)

When a loose rivet is moving in same orbit but at 90 degree with the previous orbit path then in that case the relative speed of the rivet with respect to the satellite is given as

good for her? ? where is the question?

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.