Show that the motion of a helical spring with a small mass attached to its end is simple harmonic. If this system has the same period of oscillation as the simple pendulum in (A) above, find its angular speed and show that the displacement can be written down as = sin , where is the angular displacement, and obtain similar expressions for the velocity and acceleration.

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?

The ability to make things happen is also called a. heat b. force c. matter d. energy

Aloop of wire is in a magnetic field such that its axis is parallel with the field direction. which of the following would result in an induced emf in the loop? choose all that apply. a loop of wire is in a magnetic field such that its axis is parallel with the field direction. which of the following would result in an induced emf in the loop? choose all that apply. moving the loop outside of the magnetic field region. spin the loop such that its axis does not consistently line up with the magnetic field direction. change the magnitude of the magnetic field. change the diameter of the loop