Me with these questions as soon as possible i need to turn it
a 60 watt light bulb uses 60 joules of electrical energy every second. however, only 6 joules of electrical energy is converted into light energy each second.
a. what is the efficiency of the light bulb? give your answer as a percentage.
b. what do you think happens to the “lost” energy?
19. the work output is 300 joules for a machine that is 50% efficient. what is the work input?
20. a machine is 75% efficient. if 200 joules of work are put into the machine, how much work output does it produce?