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?

Answers

Answer 1

Answer: a. I believe this might be the answer but
6 J/60 J= .1
.1 x 100= 10%

b. I'm not sure of this question

19. I'm not sure if I did this correct way or if there is a better way (I'm rusty)
300 J/.50 %= 600
600/100= 6 (answer)

20. (200 J)(.75%) = 150 (answer)
Check:
Efficiency: output/input x 100
150 J/200 J= .75
.75 x 100= 75%

Related Questions

The table lists pressure and volume values for a particular gas. Which is the best estimate for the value of V at P = 7.0 × 103 pascals? P (pascals) V (liters) 5.0 × 103 6.0 1.5 × 104 3.0 2.0 × 104 2.0 2.5 × 104 1.5
A fulcrum is? A. A support for an inclined plain. B. The place where a lever is supported. C. Measured in Newton-meters. D. Measured in joules.
What is the term for the ability to cause change in matter?A. Energy B. Temperature C. Acceleration D. Force
John can travel to atlanta 560 miles in 9 hours what is his velocity
When object A collides with object B and bounces back, its final momentum is ____ its initial momentum.

How long does it take the moon to go from full-moon phase to new-moon phase

Answers

A complete cycle of phases is 29.531 days.
From full-moon to new-moon is half of that.

Answer:

About two weeks (15 days to be exact)

Explanation: Look at this cool emoji thing I did :)

⁣Scroll fast!

⁣

True or False.. Although the Kinetic Theory of Matter states that the particles that make up all matter are in perpetual motion, we know that this isn’t really correct because solids don’t move.

Answers

The answer is false because kinetic energy contains motion!

The answer is false because the Kinetic Theory of Matter does not involve particles that make up all matter

How do the locations of frequent earthquakes help support the theory of plate tectonics?a. They shake the top layer of the earth.
b. They create large rifts in the earth.
c. They occur along the edges of the tectonic plates.
d. They alter the topography of the surface of the earth. Please help

Answers

The correct answer for the question that is being presented above is this one: "c. They occur along the edges of the tectonic plates." Frequent Earthquakes occur along the edges of tectonic plates and therefore show that these fault lines are in constant motion. supporting the theory of plate tectonics.

A marble statue has a mass of 6,200 grams and a volume of 2,296 cm3. What is the density of marble?

Answers

d= m/v
d= 6200/2296
density = about 2.7

In ultrasound physics, which of the following is improved by increasing packet size ?

Answers

You're going to have to give me the choices.
I'm pretty sketchy on that subject.

The current stellar "yardstick" is the ______

Answers

The light year is the unit often used to describe distance in terms of astronomy

It the 'parsec', equal to about 3.26 light years.

Other Questions

The efficiency of the wedge is low because of _____.width friction length height

A ping pong ball with a mass of 2.20 grams rolls along a frictionless table with a velocity of 0.850 m/s. What is the momentum of the ping pong ball?

An equinox occurs whena. neither end of Earth’s axis is tilted toward or away from the sun.b. the north end of Earth’s axis is tilted away from the sun.c. the north end of Earth’s axis is tilted toward the sun.d. Earth’s axis is parallel to the sun’s rays.

A bowling ball with a mass of 4.5 kg travels at a velocity of 37 m/s for 2.5 s until it is stopped at the end of the lane by the ball return. What additional information is required to determine the weight of the bowling ball?a. the speed at which the ball return captured the ballb. the amount of friction from the bowling lane acting on the bowling ballc. the acceleration due to gravity acting on the bowling balld. the force the bowler applied to the bowling ball