Complete these sentences. If a bouncing ball has a total energy of 20 J and a kinetic energy of 5 J, the ball's potential energy isJ. If the kinetic energy of the ball decreases, then the potential energy will.

a particle is constrained to move along a straight line through O. it starts initially at D, which is a fixed distance from O in the positive direction& moves at a constant velocity of 4ms^-1 for 15 sec.

During a thunder storm, movement of water molecules within clouds creates friction which causes the bottom of the clouds to become negatively charged. This means that the bottom of the cloud and the ground begin to act like parallel plates.

Does an electromagnetic waves speed affected by the changes in media?

Describe two ways to change the frictional force between two solid surfaces.

If an engine is described as having 150bhp/6000, the engine produces

SI unit of mass and gravity

What is the difference between porosity and permeability

In the diagram below, the planets' relative distances from the Sun are shown. The sizes of the planets are not drawn to scale.

Should athletes be benched if their grades are too low, or should they be allowed to play anyway?

How is radioactivity produced