What are the two criteria necessary for a substance to be considered a magnet

A superball of mass m is dropped vertically from a height, h. if the impact time with the floor is t, what is the average force on the ball

Suppose 3 neutrons are released by an atom of U-235 in the first stage of a fission chain reaction. Each of these neutrons has enough energy to cause another fission reaction in another nucleus of U-235, releasing more neutrons.

A magnet in the form of a cylindrical rod has a length of5.00 cm and a diameter of 1.00 cm. It has a uniform magnetization of5.50 X 10^3 A/m. What is its magnetic dipole moment?

A parallel-plate capacitor is formed from two 3.1 cm - diameter electrodes Part What is the charge (in nC) on each electrode? Express your answer using two significant figures spaced 1.7 mm apart.

1. What is the relationship between electricity and electrons?

The particles in a surface water wave move back-and-forth only. Question 9 options: True False

Does the acceleration of a falling body change or is it constant

What can cause sediment to form on land? Only mechanical weathering rocks Only biological weathering rocks Any kind of weathering or rocks Melting of rock in the core

The speed of a car is decreasing uniformly from 35 m/s to 15 m/s in 4 s the magnitude of the car's acceleration is

An object that has kinetic energy must what?