Magnetism is produced by the motion of electrons as they A. move around the nucleus. B. spin on their axes. C. both A and B D. none of the above

A race car driver is driving his car at a constant speed of 45.0 m/s on a circular track with a radius of 285 m.

A steel ball with mass 0.347 kg falls onto a hard floor and bounces. Its speed just before hitting the floor is 23.6 m/s and its speed just after bouncing is 12.7 m/s.

Precise measurements of earth indicate that its polar diameter is

Which filter is used primarily to protect the lens? a: polarizing b: macro c: haze d: nd

Which of the following is an example of sound energy? A. a tv signal lost bc of a storm B. the waves from a star seen in the sky C. a light bulb giving off energy as heat D. waves moving through air after a crash

You are in the lab and are given two rods set up so that the top rod is directly above the bottom one. The two straight rods 50-cm long are separated by a distance of 1.5-mm each with 15 A of current passing through them.

What is the explanation for feather beds being warm

A student wearing frictionless in-line skates on a horizontal surface is pushed by a friend with a constant force of 47 N. How far must the student be pushed, starting from rest, so that her final kinetic energy is 354 J?

Suppose a rocket ship in deep space moves with constant acceleration equal to 9.8 m/s2, which gives the illusion of normal gravity during the flight.

A canoeist on a lake throws a 0.145 kg baseball at 20.0 m/s to a friend in a different canoe. Each canoe with its contents has a mass of 120 kg, and is at rest initially.