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ale4655 [162]
3 years ago
7

A big box of sausages (30 kg) are lifted from the ground to the top shelf of the freezer. If the box is lifted at a constant spe

ed, a distance of 1.75 m, what work is done by gravity?
Physics
1 answer:
morpeh [17]3 years ago
4 0

Answer:

The work done by gravity moving the box up is -514.5 Joules.

Explanation:

The gravity acts in the direction of the displacement, which in this case is negative (ground - top shelf), and so the resulting work is negative. The work is calculated as:

W_g = mg\Delta h = 30kg\cdot 9.8\frac{m}{s^2}\cdot(0-1.75)m=-514.5J

The work done by gravity moving the box up is -514.5 Joules.


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Answer:

Solids are easily recognized by their ability to retain a fixed shape and definite volume. Particles making

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To change the temperature of a solid, heat energy must be added. The amount of heat energy that changes

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The general equation for calculating heat energy to change the temperature of a solid is:

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Q = m c DT

10 g 10 g 10 g 10 g 10 g 10 g

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If you continue to add heat energy once the temperature of the ice reaches 0°C , the heat absorbed is called

the heat of fusion (Lf). This heat is used to cause a change of phase (from a solid to a liquid). This heat is

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The general equation for calculating heat energy to change a solid to a liquid is:

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Q = m Lf

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