A 1.5 kg ball on the end of a 0.5 m string is whirled in a horizontal circle. If it makes 60 revolutions in 45 seconds a) calculate its speed.

b) Calculate its acceleration
c)Calculate the tension in the string. (the net force)

An electric current in a wire will push or pull on a permanent magnet. which statement best explains how an electric current creates an electromagnetic force on another magnet?

Complete the statement about memory improvement. ( )involves organizing and breaking down information into easier groups to expand capacity. rehearsal is the verbal repetition of information. these techniques are especially important for the improvement of ( ) memory.

Hydrogen and helium are both members of?