{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Class 26 Notes

# Class 26 Notes - A 5.00 kg block is initially moving...

This preview shows pages 1–3. Sign up to view the full content.

11/25/09 Oregon State University PH 201, Lecture #26 1 A 5.00 kg block is initially moving horizontally at 4.00 m/s across a frictionless surface. Then it slides down a frictionless ramp, losing 2.00 m of altitude in the process. At the bottom of the ramp, it encounters another horizontal surface, but this one exerts a kinetic friction force of 10 N on the block. How far across this surface will the block slide before coming to rest? 1. 4.0 m 2. 5.8 m 3. 9.8 m 4. 13.8 m 5. None of the above.

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
11/25/09 Oregon State University PH 201, Lecture #26 2 Mechanical Power Simply put, power is a measure of the change or transfer of energy per unit time . Of course, this is the most general de fi nition—it could include any form of energy (heat, radiation, work, etc.). For our fi rst purposes, we look only at the rate at which work is done: mechanical power . P avg = W / t In general, W = Fx· cos ± , but note that when F is constant and in the same direction as x , W = Fx . In that case: P avg = Fx / t = Fv avg Example : What average mechanical power is required to accelerate a 1000 kg car from rest to 20 m/s in 10 seconds?
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

### Page1 / 8

Class 26 Notes - A 5.00 kg block is initially moving...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online