What must happen for an electromagnet to have a magnele field? A. It must be heated.
B. It has to be touching another magnet.
c. It must be connected to an electrical source.
D
It must be lined up with Earth's magnetic field.

Find the dimensions and area of the largest rectangle that can be inscribed in the upper half of the ellipse. (give your answers in terms of a and b. enter the dimensions as a comma-separated list.)

Give one example to show that when substances are mixed,it may result in a chemical or a physical change depending on the conditions.

Ahockey player of mass 82 kg is traveling north with a velocity of 4.1 meters per second he collides with the 76 kg player traveling east at 3.4 meters per second if the two players locked together momentarily in what direction will they be going immediately after the collision how fast will they be moving