You wish to place a spacecraft in a circular orbit around the earth so that its orbital speed will be 4.00×103m/s. what is this orbit's radius?

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.