Posted by **Jarin** on Friday, August 3, 2007 at 7:46am.

Jack rides his 213kg motor cross bike 25.3m up a 30.0 degree slope at a constant speed. what is the energy his bike expends if the frictional force opposing its movement is one-tenth its weight?

Are you sure the mass is 213 kg? Shouldn't it be 21.3 kg? Or does that include Jack's own mass? Eithner way, 213 kg seems too hign.

The work is expended by the bike rider, not the bike itself.

The actual work done, including frictional work, is the weight times the vertical diatance change (25.3 sin 30) PLUS the frictional force times the distance moved.

Sorry, I assumed this was a bicycle. It is apparently a motor vehicle. The method of solution remains what I outlined, but the 213 kg should include the weight of the rider

## Answer This Question

## Related Questions

- physics - there are 3 parts to my question. i need help on the last part. 1.a. A...
- Science - A boy exerts a force of 15N to push a motor bike which has flat tyre ...
- Science - A boy exerts a force of 15N to push a motor bike which has flat tyre ...
- physics - Shawn and his bike have a total mass of 57.1 kg. Shawn rides his bike ...
- Physics - Shawn and his bike have a total mass of 58.5 kg. Shawn rides his bike...
- physics - Shawn and his bike have a total mass of 51.1 kg. Shawn rides his bike ...
- Physics - A student holds a bike wheel and starts it spinning with an initial ...
- sciencce - Mrs. Scheib was riding her bike and leaves home and rides due east ...
- Physics waves- help please - A police officer with good ears hears an ...
- Physics - - a 1200 W motor bike can move at a maximum speed of 30.0 m/s . how ...

More Related Questions