The average force exerted on the car due to friction and air resistance.
Answer to Problem 60P
Solution:
The average force exerted on the car due to friction and air resistance =
Explanation of Solution
Given:
Power of car
Steady speed of car=
Concept used:
Power=
Where
Power
(negative sign is neglected)
Calculation:
Hence, average force exerted by friction and air resistance =
It acts opposite to velocity.
Conclusion:
Friction and air resistance acts opposite to velocity of body, so resistance do negative work and to maintain steady speed we have to supply energy.
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