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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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If you lift the front wheel of a poorly maintained bicycle off the ground and then start it spinning at 0.69 rev/s , friction in
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