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Georgie was pulling her brother (of mass 23.5 kg) in a 11 kg sled with a constant force of 39 N for one block (56 m). How much work did Georgie do? Answer in units of J.

Part 2: How long would a 100 W lightbulb have to glow to produce the same amount of energy expended by Georgie? Answer in units of s.
asked Jan 26, 2016 in PHYSICS by anonymous

2 Answers

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Part 1:

Georgie was pulling her brother with a constant force is image.

The sled moves distance is image.

The component of force that is in the direction of the sleds movement is image.

The work done is image.

Substitute image and image.

image

image.

The work done by Georgie is image.

answered Jan 26, 2016 by Sammi Mentor
0 votes

Part 2:

The power of the light bulb is image.

From Part 1: The work done by Georgie is image.

The power is image.

The time image.

Substitute image and image.

image

image.

image light bulb needs to glow image.

answered Jan 26, 2016 by Sammi Mentor
edited Jan 26, 2016 by Sammi

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