A block is attached to a vertical spring with a spring constant 800 N/m. The spring stretches 5 cm down and reaches equilibrium. How much elastic potential energy is stored in the system?

Suppose a wire with a current is pushed upward by a magnetic field. how would the wire move if the direction of the current reversed? explain your answer.

Convection occurs when thermal energy is transferred by the movement of

In this thread, i would like you to comment on the nature of light and how operation of telescopes. light has a duality of a particle and a wave; which one affects your life? also how does light interact with optics inside telescopic systems? answer these questions in two paragraphs. then respond the another students response.