Work Energy And Power Question 274

Question: The energy content of gasoline is 3.6×107J/L . A motor with an efficiency of 20% is needed at fall output power of 45 kW for 50.0 minutes. How many litres of gasoline are required to operate the motor for this amount of time?

Options:

A) 0.31 L

B) 0.38 L

C) 1.6 L

D) 19 L

Show Answer

Answer:

Correct Answer: D

Solution:

[d] E=Pt=45×103×50×60=1.35×108

V=1.35×1083.6×107=3.75L Since the motor is 20% efficient, five times as much gasoline is needed.



NCERT Chapter Video Solution

Dual Pane