A closed system consists of a pendulum that is swinging back and forth. If the pendulum's gravitational potential
energy decreases, what else must happen to the energy of the
system?
O A. Its total mechanical energy must decrease.
O B. Its kinetic energy must decrease.
O C. Its kinetic energy must increase.
D. Its total mechanical energy must increase.

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?

Name three populations commonly found in a prairie system

An electron moving at 5.06 103 m/s in a 1.23 t magnetic field experiences a magnetic force of 1.40 10-16 n. what angle does the velocity of the electron make with the magnetic field? there are two answers between 0° and 180°. (enter your answers from smallest to largest.)