The power (watts and hp) tokeep the car travelling at a constant
Answer to Problem 63P
Solution:
Explanation of Solution
Given:
Mass of car
Final speed
Initial speed
Time
FormulaUsed: From work-energy principle:
Power
Calculation:
Convert speed from km/h to m/s:
˜ ≈
Negative work done means that work done by resistive forces opposes the motion.
Power of resistive force
Average power of resistive forces
Resistive force is directly proportional to sped but
Conclusion:
If car is moving with constant speed, then resistive force (friction, air drag etc) opposes the motion. So, to maintain steady speed one needs to supply energy.
Chapter 6 Solutions
Physics: Principles with Applications
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