Question

Количество теплоты,отданное холодильнику,равно 42кДж.КПД равен 32%.Определить количество теплоты,получаемой машиной от нагревателя.

Answer 1

Q1=Q2*(1-КПД)=42*(1-0,32)=61,76 кДж

Answer 2

Calculating Heat Received from the Heater

To calculate the amount of heat received from the heater, we can use the formula for efficiency (η) of a heat engine, which is given by:

η = (Useful energy output / Energy input) * 100%

Given: - Useful energy output (Qc) = 42 kJ - Efficiency (η) = 32%

We can use the efficiency to find the energy input (Qh) and then calculate the heat received from the heater.

Calculations

Using the formula for efficiency, we can rearrange it to solve for the energy input (Qh):

η = (Qc / Qh) * 100%

Solving for Qh: Qh = Qc / (η / 100%)

Substitute the given values: Qh = 42 kJ / (32 / 100)

Calculating: Qh = 42 kJ / 0.32 Qh = 131.25 kJ

So, the amount of heat received by the machine from the heater is 131.25 kJ.