Question

In a loading a lorry a man lifts boxes each weight 200N through a height of 3.5m.

Answer 1

The work done on the boxes and the energy spent is 700J while the power required to lift 4 boxes per minute is 2.8kW

This work done on an object is the force required to move that object from point A to point B.

Data Given;

• Weight (mg) = 200N
• Distance (s) = 3.5m

Work Done

This is the work done to move the boxes from point A to point B.

$w = F.s\\F = ma = mg = 200N\\w = 200 * 3.5\\w = 700J$

The work done to move the object is 700J

Energy

This is used to calculated the energy used to carry the work done and the formula is given as

$E = force * displacement\\E = F.s\\E = 200 * 3.5\\E = 700J$

The energy transferred when he lifts one box is 700J

Power

Power is the rate at which energy is used with respect to time

$P = E/t$

The energy required to lift 4 boxes in one minutes is

$700 * 4 = 2800$

Now we can calculate the power used

$P = Energy / time\\P = 2800 / 1 \\P = 2800W = 2.8kW$

The power required to move four boxes in 1 minutes is 2.8kW

From the calculations above, the following was gotten

• work done = 700J
• Energy = 700J
• Power = 2800W or 2.8kW

Learn more on work done, energy and power here;

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