# HW_6 - P1112 Fall 2008 Homework#6 3 Due week of Oct 6...

This preview shows pages 1–2. Sign up to view the full content.

P1112 Fall 2008 Homework #6 Due week of Oct 6. Reading: 4.3-4.6, Chapter 5. Not all concepts will be covered in class – you are responsible for all material in the reading and in the homework problems. Problems: 1. An athlete whose mass is 90.0 kg is performing weight-lifting exercises. Starting from the rest position he lifts, with constant acceleration, a barbell that weighs 490 N. He lifts the barbell a distance of 0.60 m in 1.6 s. a) Draw a clearly labeled free-body diagram for the barbell and for the athlete. b) Use the diagrams in part a) and Newton’s laws to find the total force that his feet exert on the ground as he lifts the barbell. 2. A box whose weight is w is pulled at constant speed along a level floor by a force F that is directed at an angle θ above horizontal. The coefficient of kinetic friction between the floor and box is μ k . (a) In terms of θ , μ k , and w, calculate the required force F. (b)

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

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 08/28/2009 for the course PHYS 1112 taught by Professor Leclair,a during the Fall '07 term at Cornell.

### Page1 / 2

HW_6 - P1112 Fall 2008 Homework#6 3 Due week of Oct 6...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online