# power and efficiency alevel help

#1
can anyone help me work out this problem its the first question about a car. I don't know if I'm a bit slow but I cannot for the life of me figure it out. apparently the answer is 56.9 W.
thank you!
0
4 weeks ago
#2
This question is driving me insane. I can't figure out how to do this unless you were given another value such as the coefficient of friction or just the efficiency. And as the system is in equilibrium, there is no resultant force, do you try to figure it out by imagining it without friction and finding what the acceleration would be ???????

AHSIHBDHKBEKDBDWBIWD this is very confusing. I might be missing something but I can't see it. sorry I can't help :/
0
4 weeks ago
#3
I think ans key is wrong.
P = Fv
= 5250 W
0
4 weeks ago
#4
(Original post by Ethanity007)
I think ans key is wrong.
P = Fv
= 5250 W
yeah it makes no sense that an engine would output 50W
0
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