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maks197457 [2]
2 years ago
14

A heating coil inside an electric kettle delivers 2.2 kW of electrical power to the water in the kettle. How long will it take t

o raise the temperature of 0.50 kg of water from 30.0° C to 72.0° C
Physics
1 answer:
Otrada [13]2 years ago
8 0

Answer:

0.04s

Explanation:

Specific heat of water c = 4.186J/g.C

The heat energy it would take to heat up 0.5 kg of water from 30C to 72 C is

E = mc\Delta T = 0.5 * 4.186 * (72 - 30) = 87.9 J

If the power of the electric kettle is 2.2kW (or 2200W) and suppose the work efficiency is 100%, then the time it takes to transfer that power is

t = \frac{E}{P} = \frac{87.9}{2200} = 0.04 s

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ollegr [7]

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8 0
2 years ago
A 87 arrow is fired from a bow whose string exerts an average force of 105 on the arrow over a distance of 75 .
timofeeve [1]

The solution would be like this for this specific problem:

 

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So the speed of the arrow as it leaves the bow is 42.5 mps.

I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

6 0
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