Drag Force and Power on an inclined plane

[kraaaaamos]

Homework Statement

A 710 kg car drives at a constant speed of 23 m/s. It is subject to a drag force of 500N. What power is required from the car’s engine to drive the car
a. on a level ground?
b. up a hill with a slope of 2.0 0?

Homework Equations

P=Fv

The Attempt at a Solution

a) P = (500)(23)?

b) P = (500cos2)(23)?

I HAVE NO IDEA.

 

[rl.bhat]

In the second part slope is given. Slope = tan(theta). From that find sin(theta). Now the total drag force during up hill drive = 500 + Mgsin(theta)

 

[kraaaaamos]

so for b
its:


P = (500+ mgsin(theta))(v)
= [500 + (710)(9.8)(sin2) ](v)
= 17 085 W?

 

[rl.bhat]

P = (500+ mgsin(theta))(v)
= [500 + (710)(9.8)(sin2) ](v)
= 17 085 W?
Tan(theta) = 2. Using trigonometrical tables find theta and then find theta or if Tan(theta) = 2. the sin(theta) = (sqrt.5)/2 Use this and find the value.