Asked by Laura
What power is required to accelerates a 1980kg car from 30km/h to 70km/h against a constant force of resistance of 750N over a distance of 85m.
Thank you for your help!
Thank you for your help!
Answers
Answered by
Scott
the average speed of the car is 50 kph
convert the speeds to m/s
find the time to cover the 85 m
find the change in kinetic energy
... KE = 1/2 m v^2
the work against resistance (friction)
... work = f d = 750 N * 85 m
work and energy are the same thing
add the work and the change in KE
... divide by the time
... this is the power (in Watts)
convert the speeds to m/s
find the time to cover the 85 m
find the change in kinetic energy
... KE = 1/2 m v^2
the work against resistance (friction)
... work = f d = 750 N * 85 m
work and energy are the same thing
add the work and the change in KE
... divide by the time
... this is the power (in Watts)
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