A pulley system has an efficiency of 74.2%. If you perform 200 J of work, howmuch useful work does the pulley perform?
A. 52 J
B. 113 J
C. 148 J
D. 200 J
SUBMI

Answers

Answer 1

Answer:

Answer:

Explanation:

If a pulley system has an efficiency of 74.2%, then only that fraction of the work performed will be useful. 74.2%=0.742. 0.742*200 is about 148J. Hope this helps!

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Answers

One very useful definition if energy is "the ability to do work".

Final answer:

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Explanation:

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The ____ states that between 15 and 20 billion years ago, the universe began expanding out of an enormous explosion. A. H-R diagram
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Answers

In my opinion, the correct answer among the choices listed above is option C. The Big Bang Theory states that between 15 and 20 billion years ago, the universe began expanding out of an enormous explosion. However, the exact number is approximately 13.8 billion years ago.

Answer:

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Explanation:

The big bang theory describes the beginning of the universe. According this theory, all the matter of the universe was confined at a point and about 15-20 billion years ago, it started expanding out of a huge explosion -the big bang. The universe has been expanding since then. The discovery of cosmic microwave background radiation provides the evidence to this theory.

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Answers

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