A student using a stopwatch finds that the time for 15 complete orbits of a ball on the end of a string is 40 seconds. The period of the orbiting ball is

Acoil formed by wrapping 80 turns of wire in the shape of a square is positioned in a magnetic field so that the normal to the plane of the coil makes an angle of 28.0° with the direction of the field. when the magnetic field is increased uniformly from 200 µt to 600 µt in 0.400 as, an emf of magnitude 80.0 mv is induced in the coil. what is the total length of the wire?

Matter that emits no light at any wavelength is called

Which wave is the result of amplification and produces a louder sound