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Andrej [43]
3 years ago
12

Mary takes 6.0 seconds to run up a flight of stairs that is 102 meters long. If Mary's weight is 87 newtons, what power has Mary

exerted?
Physics
1 answer:
fredd [130]3 years ago
8 0

Answer: 1479watts

Explanation:

Power is defined as the energy expended or work done in a specific time.

Mathematically,

Power = Workdone/time taken

Since work done is force × distance

Power = force × distance/time

Force = Mary's weight = 87N

Distance = height of the flight = 102meters

Time = 6.0seconds

Substituting in the formula we have;

Power = 87 × 102/6

Power = 1,479watts

Note that the time must be in seconds before usage. If its given in minutes, you will have to convert to seconds

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Two rigid tanks of equal size and shape are filled with different gases. The tank on the left contains oxygen, and the tank on t
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Answer:

The number of oxygen molecules in the left container greater than the number of hydrogen molecules in the right container.

Explanation:

Given:

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Molar mass of hydrogen, M_H=2

We know ideal gas law as:

PV=nRT

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V = volume of the gas

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R = universal gs constant

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m = mass of gas in grams

M = molecular mass of the gas

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PV=\frac{m}{M}.RT

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P=\rho.\frac{RT}{M}

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