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Homework Statement
In order for a car of 4000kg to travel at 10m/s with a frictional force of 400N, find the power output of the engine.
Homework Equations
P=Fv
The Attempt at a Solution
I found
40000*10+400*10=400400W,
is this right?
No, not really.Homework Statement
In order for a car of 4000kg to travel at 10m/s with a frictional force of 400N, find the power output of the engine.
Homework Equations
P=Fv
The Attempt at a Solution
I found
40000*10+400*10=400400W,
is this right?
No, it's not 4000 N. Write the force balance equation for the horizontal direction:oh. SO it's 4000N?
The initial condition is irrelevant here. You're told that, right now the car is moving at a constant rate of 10 m/s. This, along with the applied force, is enough info to determine the power output right now.But what if the question did not state whether the car started from rest or with an initial velocity of 10m/s?