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Q: A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machine? A. 96 percent B. 92 percent C. 94 percent D. 97
percent
A: The answer is: A. 94 percent (which is easily calculated, 3760/4000x100).
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Original conversation
User: A machine is supplied energy at a rate of 4,000 W and does useful work at a rate of 3,760 W. What is the efficiency of the machine? A. 96 percent B. 92 percent C. 94 percent D. 97 percent

Weegy: The answer is: A. 94 percent (which is easily calculated, 3760/4000x100).
Koolsum|Points 1456|

User: A car travels from Boston to Hartford in 4 hours. The two cities are 240 kilometers apart. What was the average speed of the car during the trip? A. 960 km/hour B. 36 km/hour C. 60 km/hour D. 4 km/hour

Weegy: C. 60 km/hour
taben29|Points 777|

User: . An object has a mass of 120 kg on the moon. What is the force of gravity acting on the object on the moon? A. 20 N B. 1,176 N C. 12.24 N D. 196 N

Weegy: C. 196 N
stan_r|Points 1382|

User: According to Ptolemy's model of the movement of celestial bodies, A. planets orbit in circular paths around the earth. B. the sun is the center of the universe. C. the earth rotates around the moon. D. the earth rotates around the sun.

Weegy: According to Ptolemy's model of the movement of celestial bodies,: C. planets orbit in circular paths around the earth.
andrewpallarca|Points 27593|

User: A man standing on a bus remains still when the bus is at rest. When the bus moves forward and then slows down the man continues moving forward at the original speed. This is an example of the effect of A. weight. B. velocity. C. gravity. D. inertia.

Weegy: A man standing on a bus remains still when the bus is at rest. When the bus moves forward and then slows down the man continues moving forward at the original speed. This is an example of the effect of velocity. [ ]
Expert answered|wisbest|Points 2850|

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Asked 11/20/2013 1:47:20 PM
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Rarefaction occurs only in a _______ wave. A. sympathetic. B. transverse. C. longitudinal. D. forced.
Question
Not Answered
Updated 4/20/2014 6:22:41 PM
1 Answer/Comment
Rarefaction occurs only in a longitudinal wave.
Added 4/20/2014 6:22:41 PM
This answer has been confirmed as correct, not copied, and helpful.
Confirmed by andrewpallarca [4/20/2014 6:31:00 PM]
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