Power of a car weighing 1200kg is 134.05hp and its efficiency is 90%. How long will it take to raise of the car to 20m/s from rest.
solution:v2=u2+2as
400=2as
as=200
real power=13.05hp
=100001.3W
effective power=90001.17W
Power=W/t
=mas/t
=1200*200/t
t=90001.17/240000
=2.67s
but the answer doesn't match. The answer sheet shows 5min
2 answers
How did you go from 134.05 hp to 13.05 hp ?
sorry that was a mistake in typing but the calculation is okay
0 answers