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kotykmax [81]
3 years ago
7

Are you using more or less power if you take the same amount of time to do more work

Physics
2 answers:
Alex777 [14]3 years ago
8 0
More hope this helps!
frez [133]3 years ago
6 0
More, cause your doin more work with less time
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1.3 kg of water, at an initial temperature of 25oC, is heated at a rate of 100 W in a well-insulated container. How much time (i
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Answer:

68.25 minutes.

Explanation:

Power = Energy/time or

Power = Heat/time

P = Q/t....................... Equation 1

Q = Pt ........................ Equation 2

Where Q = quantity of heat, P = power, t = time.

Also,

Q = cm(t₂-t₁) ................. Equation 3

Where c = specific heat capacity of water, m = mass of water, t₁ = initial temperature of water, t₂ = final temperature of water.

substitute equation 2 into equation 3

Pt = cm(t₂-t₁) ............... Equation 4

make t the subject of the equation

t = cm(t₂-t₁)/P................ Equation 5

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Constant: 4200 J/kg.K

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