# Homework Help: PHYIsics =Newton's Laws

1. Oct 4, 2009

### jiwon

1. The problem statement, all variables and given/known data

A 1500-kg car is dragged up a 20 degree rough ramp by a tow truck. The coefficient of static and kinetic friction between the car and the ramp are 0.8 and 0.5 respectively. Assume that wheels are locked.

*Note: picture of a sedan pulled up a ramp with a rope.
Find the tension in the tow rope:

a.) Just before car moves up the ramp.
b.) When the car moves up the ramp at a steady speed of 0.5 m/s.
c.) When car moves down the ramp at a steady speed of 0.5 m/s.
d.) The car is pulled up the ramp at an acceleration, a =0.2 m/s^2.

2. Relevant equations

Don't nkow i got these .

3. The attempt at a solution
mayb i started off with msintheta, so it'll be 15000kgsin20=5130N

1 a.) T=1600 and t+78.4
b.) 11946.4
c.) 4914.25
d.) 6736.08

I don' tknow if these answers are right. I'm just not sure on where to start on it. Any help on it is appreciated!

Last edited: Oct 4, 2009
2. Oct 4, 2009

:rofl: