Find the gravitational potential energy of a 500 g object sitting on a shelf that is 3.5 m above the ground

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

The dipole moment of the water molecule (h2o) is 6.17x10^-30 c.m. consider a water molecule located at the origin whose dipole moment p points in the +x-direction. a chlorine ion ( of charge-1.60x10^-19c , is located at x=3.00x10^-9m . assume that is much larger than the separation d between the charges in the dipole, so that the approximate expression for the electric field along the dipole axis can be used. a) find the magnitude of the electric force that the water molecule exerts on the chlorine ion. b) what is the direction of the electric force. -x-direction or +x-direction c) is this force attractive or repulsive?