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Sergeeva-Olga [200]
2 years ago
14

If you want to lift a 5-kg box to a height of 2 meters, how much work must be

Physics
1 answer:
BlackZzzverrR [31]2 years ago
5 0

Answer:100joules

Explanation:

Mass(m)=5kg

Acceleration due to gravity(g)=10m/s^2

Height(h)=2 meters

Work=m x g x h

Work=5 x 10 x 2

Work=100joules

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If you seal a container of air at room temperature (20.0 degrees celcius) and then put it in the refrigerator (2.00 degrees celc
zheka24 [161]

The pressure inside the container will be <u>9.39×10⁴Pa</u>

At constant volume, the pressure in a container is directly proportional to its absolute temperature.

If air in a container is sealed at 20⁰C at a pressure equal to the atmospheric pressure and cooled to 2.00⁰C, the pressure inside the container falls.

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T_1=20.0^oC+273.15=293.15K\\T_2=2.00^oC+273.15=275.15K

Use the expression for the pressure law.

\frac{P_2}{P_1} =\frac{T_2}{T_1}

Substitute 100,000 Pa for P₁, 293.16 K for T₁ and 275.15K for T₂.

\frac{P_2}{P_1} =\frac{T_2}{T_1}\\ P_2=P_1(\frac{T_2}{T_1})\\ =(100,000Pa)(\frac{275.15K}{293.15K} )\\ =9.386*10^4Pa

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