Select to show the energy of pendulum 1. be sure that friction is set to none. drag the pendulum to an angle (with respect to the vertical) of 30∘, and then release it. when the pendulum is at −30∘, what form(s) of energy does it have?

it have Potential energy

Explanation:

given data

Drag the pendulum to an angle 30∘

to find out

what form of energy does it have

solution

we know that pendulum start no kinetic energy when it release from any rest position then in starting it have potential energy only so that when pendulum is angle 30∘ at some height from ground so when it start it have potential energy same as in starting.

we know that the total energy is always conserve  

so it have potential energy

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible