(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The 1900 kg mass of a car includes four tires, each of mass (including wheels) 40 kg and diameter 0.80 m. Assume each tire and wheel combination acts as a solid cylinder.

(a) Determine the total kinetic energy of the car when traveling 60 km/h.

(b) Determine the fraction of the kinetic energy in the tires and wheels.

%

(c) If the car is initially at rest and is then pulled by a tow truck with a force of 2500 N, what is the acceleration of the car? Ignore frictional losses.

(d) What percent error would you make in part (c) if you ignored the rotational inertia of the tires and wheels?

2. Relevant equations

I would understand where to go in step two. For step 1 i was using K=1/2 mv^2

For step 3 i used F=ma. Apparantly Im totally wrong.

3. The attempt at a solution

Help. The formulas I use are giving me incorrect results. about 200,000 J is what I got

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Car problem-rotational motion?

**Physics Forums | Science Articles, Homework Help, Discussion**