Intro to Calculating Work Video Lessons

Concept

# Problem: A 710 kg car drives at a constant speed of 23 m/s. It is subject to a drag force of 500 N. What power is required from the car's engine to drive the car (a) on level ground? (b) up a hill with a slope of 2.0°?

###### FREE Expert Solution

Power:

$\overline{)\begin{array}{rcl}{\mathbf{P}}& {\mathbf{=}}& \frac{\mathbf{W}}{\mathbf{∆}\mathbf{t}}\mathbf{=}\frac{\mathbf{F}\mathbf{∆}\mathbf{x}\mathbf{c}\mathbf{o}\mathbf{s}\mathbf{\theta }}{\mathbf{∆}\mathbf{t}}\end{array}}$

(a)

θ = 0° and Δx/tΔ = v

P = Fv

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###### Problem Details

A 710 kg car drives at a constant speed of 23 m/s. It is subject to a drag force of 500 N. What power is required from the car's engine to drive the car

(a) on level ground?

(b) up a hill with a slope of 2.0°?