Which of these is a contact force?

A. earth's attraction of the moon

B. force of a magnet that attracts paper clips

C. force of a bat on a baseball

Which of these best explains why Earth's tectonic plates move? Convection currents in the asthenosphere make fluid particles move. Cooling causes contraction and shifting of the fluid particles in the lithosphere.

What is the orbital velocity of Earth in kilometers per second?

What traits did Sir William Gilbert have that made him a good scientist?

A 50.0 kg child stands at the rim of a merry-go-round of radius 1.95 m, rotating with an angular speed of 2.80 rad/s.

What kind of wave would be observed in outer space between planets where there is very little matter?

A lever allows a 35 N load to be lifted with a force of 7 N. What is the mechanical advantage of the lever?

A container of gas is at a pressure of 3.7 * 105 Pa How much work is done by the gas if its volume expands by 1.6 m3?

A person carries a mass of 10 kg and walks along the + x-axis for a distance of 100m with a constant velocity of 2 m/s. What is the work done by this person? A) 20 J B) None of the other choices is correct. C) 0 J D) 200 J

Uranus has more than 14 times as much mass as earth, yet the gravitational force is less. how can that be?

What is velocity-time graph?