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if a refridgerator uses 1300 KJ to remove 1850 kj of heat. Find the efficiency.? if...

if a refridgerator uses 1300 KJ to remove 1850 kj of heat. Find the efficiency.?

if the lowest temp is -15 find T_(hot)?

if a styrofoam cube with a side area of 25 m^2. holds a sample of material at -25c How thick would the foam have to be to have a transfer rate of 125j/s max occur?

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