Question

A 420.0 W heater is used to raise the temperature of water flowing through a tube of length 2.4 m by 5.00 C. Assuming that the efficiency of heating is 50%, the flow rate of water (in litre/minute) is

(A) 0.3 

(B) 0.6

(C) 1.2 

(D) 1.8

Answer 1

Correct option: (B) 0.6

Explanation:

Heat supplied by the heater in 1 sec is 420 J