First slide

Refrigerator

Question

A refrigerator absorbs 2000 cals of heat from ice trays. If the coefficient of performance is 4, then work done by the motor is

Moderate

A

2100 J
B

4200 J
C

8400 J
D

500 J

Solution

$\begin{aligned} β & = \frac{Q_{2}}{W} \\ W & = \frac{Q_{2}}{β} \Rightarrow W = \frac{2000}{4} = 500 cal \\ = 500 \times 4.2 = 2100 Joule \end{aligned}$

Get Instant Solutions

When in doubt download our app. Now available Google Play Store- Doubts App

Recieve an sms with download link

Doubts App

OR

SCAN ME

Doubts App

Doubts App