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lianna [129]
3 years ago
5

Explain how machines can be useful if the output work is always less than the input work

Physics
1 answer:
labwork [276]3 years ago
8 0
People will always have something easy to to there handy work
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Which statement is always true about objects which exert gravitational force on each other? (3 points)
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Answer:

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How is the sun related to neuclear electromagnetic and heat energy
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A sled is at rest at the top of a slope 2 m high. The sled has a mass of 45 kg. What is the sled's potential energy?
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Answer:

PE = 882 J

Explanation:

Through the International System we know that the gravity of the earth is 9.8 m/s², so...

Data:

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  • h = 2 m
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Formula:

  • \boxed{\bold{PE=m*g*h}}

Replace and solve:

  • \boxed{\bold{PE=45\ kg*\ 9.8\frac{m}{s^{2}}*2\ m}}
  • \boxed{\boxed{\bold{PE=882\ J}}}

The potential energy of the sled is <u>882 Joules</u>.

Greetings.

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It is by no doubt that our universe had had its own starting point but how it really started became a debate for the scientists over the past centuries. From theories such as Ekpyrotic theory, White Holes, Matrix theory, and Quantum theory, the Big Bang theory is the theory mostly accepted by scientists. According to the theory, the universe started as a singularity, that is, from a black hole under extreme gravitational pressure and expanded (instead of exploded) and cooled. Its cooling, according to the theory, is still happening now as of the moment.</span>
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