- #1

Northbysouth

- 249

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## Homework Statement

An insulated copper block receives energy at a rate of 100 W from an embedded resistor. If the block has a volume of 10

^{-3}m

^{3}and an initial temperature of 20°C, how long would it take, in minutes, for the temperature to reach 60°C?

## Homework Equations

Copper specific heat = 0.385 KJ/Kg°K

Copper Density = 8930 Kh/m

^{3}

Q' = du/dt + d(KE)/dt + d(PE)/dt + W but there is no kinetic energy, potential energy or work done

Q = mcΔT

## The Attempt at a Solution

Initially, I found the mass of the copper

m

_{copper}= (8930 Kg/m

^{-3})(10

^{-3}m

^{3})

m

_{copper}= 8.930 Kg

But I'm not sure if this will help me.

How do I interpret the energy give? Is the 100 W = Q?