Plzzz
a piston in a heat engine does 600 j of work, and 1,700 j of heat are added to the system. determine the change in internal energy and explain how this example demonstrates the conservation of energy. enter your answer in the space provided

Ten students stand in a circle and are told to make a transverse wave. what best describes the motion of the students? each student bumps the shoulder of his or her neighbor. at the exact time, all students take a step to the right. the students skip clockwise, going in a circular motion. one at a time, each student lifts his or her hands up and then down.

What is hidden during a lunar eclipse? isn't the moon hidden?

Abeam of electrons with of wavelength of 7.5 x 10-6 m is incident on a pair of narrow rectangular slits separated by 0.75 mm. the resulting interference pattern is projected onto a screen 10.0 m from the slits. what is the separation of the interference maxima in the resulting interference pattern?