PLEASE help me with these questions as soon as possible i need to turn it in!!!!
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?

Question

PLEASE help me with these questions as soon as possible i need to turn it in!!!!
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?

megeliz13 · Answer

a. I believe this might be the answer but6 J/60 J= .1.1 x 100= 10%b. I'm not sure of this question19. I'm not sure if I did this correct way or if there is a better way (I'm rusty) 300 J/.50 %= 600600/100= 6 (answer)20. (200 J)(.75%) = 150 (answer)Check:Efficiency: output/input x 100150 J/200 J= .75.75 x 100= 75%

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