A 40W lamp wastes 34 J of energy every second by heating its surroundings. What is the efficiency of the lamp?
С
18%
D
85%
A
0.15%
15%
B

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final

Another word for electromagnetic energy is a. heat b. force c. matter d. radiation

Awhite-blue star is hotter than a red star. select the best answer from the choices provided true or false