10. A security gate is controlled by a 1200 lb. electromagnetic lock. During an
emergency, medical personnel are locked outside. A locksmith is called to the
scene. What is the quickest way to for the locksmith to open the gate and let the
medical personal enter the gates?
Increase the current to the lock,
Reverse the current to the lock.
Cut the current to the lock.
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What was the purpose of the apollo program? to put a man in orbit to launch a spy satellite to launch a space station to put man on the moon

Determine the time it takes for a satellite to orbit the earth in a circular "near-earth" orbit. the definition of "near-earth" orbit is one which is at a height above the surface of the earth which is small compared to the radius of the earth, so that you may take the acceleration due to gravity as essentially the same as that on the surface. does your result depend on the mass of the satellite?

How does the motion of an airplane compare to the motion of a rocket ?