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Zarrin [17]
2 years ago
9

Which statements describe a situation in which work is being done? Select three options. A mover carries a box up a flight of st

airs. A mover carries a box across a room. Wind blows against a steel table anchored to the ground. Wind blows a pool chair across the yard. A weightlifter lifts a barbell off the ground. A weightlifter holds a barbell above the head.
Physics
2 answers:
Sever21 [200]2 years ago
7 0

Answer:

Explanation:

A mover carries a box across a room. A weightlifter lifts a barbell off the ground. A weightlifter holds a barbell above the head.

that what i think

disa [49]2 years ago
7 0

Answer:

A, D, and E

Explanation:

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A 5,000 kg satellite is orbiting the Earth in a circular path. The height of the satellite above the surface of the Earth is 800
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Explanation:

The given data is as follows.

            m = 5000 kg,            h = 800 km = 0.8 \times 10^{6} m

    R_{e} = 6.37 \times 10^{6} m,    r = R + h = 7.17 \times 10^{6} m

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As we know that,

              \frac{mv^{2}}{r} = \frac{GmM_{e}}{r^{2}}

                      v = \sqrt{\frac{GM_{e}}{r^{2}}}

And, it is known that formula to calculate angular velocity is as follows.

               \omega = \frac{v}{r} = \sqrt{\frac{GM_{e}}{r^{3}}}

                            v = \sqrt{\frac{GM_{e}}{r^{3}}}

                               = \sqrt{\frac{6.67 \times 10^{-11} Nm^{2}/kg^{2} \times 5.98 \times 10^{-24} kg^{-2}}{(7.17 \times 10^{6} m)^{3}}}

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Which is the phase change in which a substance changes from a gas to liquid?
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Answer:

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The phase change in which a substance changes from a gas to liquid is Condensation.

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Matter under certain conditions can change from one state to another. When Solids are heated they change into Liquids through the process of Heating. Upon cooling, the Liquids convert to Solid through freezing. When a Liquid such as water is heated, it converts into the Gaseous state through evaporation. Upon cooling, the Gas converts back into the Liquid state through Condensation.

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