1. The picture shows a weight lifter. (a) In one lift, he does 5040 J of work against gravity. (i) One lift takes 4 seconds. Complete the sentence by putting a cross (X) in a box next to your answer. The power used to lift the weight is ☐ A 1260 W ☐ B 2016 W ☐ C 12600 W ☐ D 20160 W (ii) The weight he lifts has a mass of 240 kg. Gravitational Field Strength = 10 N/Kg The energy gained by the mass is equal to the work done when lifting it. Calculate the height he lifts this mass.

GCSE Edexcel Physics Kinetic Energy: 1. The picture shows a weight li

1. The picture shows a weight lifter - Edexcel - GCSE Physics - Question 1 - 2012 - Paper 1

Question 1

1. The picture shows a weight lifter. (a) In one lift, he does 5040 J of work against gravity. (i) One lift takes 4 seconds. Complete the sentence by putting a cr... show full transcript

Worked Solution & Example Answer:1. The picture shows a weight lifter - Edexcel - GCSE Physics - Question 1 - 2012 - Paper 1

Step 1

Complete the sentence

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Answer

To calculate power, we use the formula:

$P = \frac{W}{t}$

Where:

$P$ is the power in watts (W)
$W$ is the work done in joules (J)
$t$ is the time in seconds (s)

Substituting the given values:

$P = \frac{5040 \, \text{J}}{4 \, \text{s}} = 1260 \, \text{W}$

Thus, the correct option is A 1260 W.

Step 2

Calculate the height he lifts this mass

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Answer

First, we calculate the weight of the mass using the formula:

$F = m \cdot g$

Where:

$F$ is the force (weight) in newtons (N)
$m$ is the mass in kilograms (kg)
$g$ is the gravitational field strength (N/kg)

Substituting the values:

$F = 240 \, \text{kg} \cdot 10 \, \text{N/kg} = 2400 \, \text{N}$

Since the energy gained by the mass is equal to the work done, we set the work done to the weight lifted multiplied by the height:

$W = F \cdot h$

Given that $W = 5040 \, \text{J}$ , we solve for height ( $h$ ):

$h = \frac{W}{F} = \frac{5040 \, \text{J}}{2400 \, \text{N}} = 2.1 \, \text{m}$

Thus, the height he lifts this mass is 2.1 m.

1. The picture shows a weight lifter - Edexcel - GCSE Physics - Question 1 - 2012 - Paper 1

Worked Solution & Example Answer:1. The picture shows a weight lifter - Edexcel - GCSE Physics - Question 1 - 2012 - Paper 1

Complete the sentence

Calculate the height he lifts this mass

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