1 An object has a gravitational potential energy of
41772.5J and has a mass of 1550kg. How high is
it above ground?

Aneutron and a proton combine to form a nucleus. why does the mass of the nucleus differ from the sum of the masses of the individual nucleons?

An incident ray through the focal point of a spherical mirror will: reflect through the center of curvature. reflect back through the focal point. reflect parallel to the principle axis. reflect the same direction as the incident ray.

If angle "a" is 25°, angle "b" is: a) equal to angle c b) less than angle c c) greater than angle c