# Torque of a Stationary Car

## Homework Statement

A mechanic jacks up a car to an angle of 10.0° to change the front tires. The car is 2.95 m long and has a mass of 1150 kg. Its center of mass is located 1.12 m from the front end. The rear wheels are 0.40 m from the back end. Calculate the torque exerted by the car around the back wheels.

## Homework Equations

T = F x r x sintheta
sum of the torques = 0
F = ma

## The Attempt at a Solution

Clueless when I have to figure out where the gravity is acting, and so forth. Basically, I don't know where to start.

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LowlyPion
Homework Helper
Welcome to PF.

Start by drawing a diagram.

You are going to use the back wheel at the pivot point. And the sum of the Torques are going to be 0.

But the question only looks like it wants the torque from the car, not the jack. So ... how far is the center of mass from the pivot along the horizontal after taking into account the angle the car is tilted at?