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ss7ja [257]
3 years ago
6

What is the thermal efficiency a carnot engine operating between the highest and lowest temperatures reached by this engine?

Physics
1 answer:
vladimir1956 [14]3 years ago
6 0
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A 3 kg rock sits on a 0.8 meter ledge. If it is pushed off, how fast will it be going at the bottom?
andrey2020 [161]

As long as it sits on the shelf, its potential energy
relative to the floor is . . .

   Potential energy =      (mass) x (gravity) x (height) =

                                       (3 kg) x (9.8 m/s²) x (0.8m) = <u>23.52 joules</u> .

If it falls from the shelf and lands on the floor, then it has exactly that
same amount of energy when it hits the floor, only now the 23.52 joules
has changed to kinetic energy.

   Kinetic energy =                                          (1/2) x (mass) x (speed)²

                                                 23.52 joules = (1/2) x (3 kg) x (speed)²

Divide each side by  1.5 kg :     23.52 m²/s² = speed²

Take the square root of each side:    speed = √(23.52 m²/s²) =  <em>4.85 m/s </em> (rounded)


6 0
3 years ago
II. IDENTIFY THE TYPE OF FORCE
uysha [10]

Answer:

Explanation:

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5.When a person is pushing a trolley then object experience a normal reaction from ground.

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[]Answer the question below[]
marysya [2.9K]
Answer:

The answer is D. density.
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Which of the following statements BEST explains why ball-and-socket joints have the greatest range of motion?
galina1969 [7]

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