{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Homework 8

# Homework 8 - Gozick Brandon Homework 8 Due Oct 6 2006 5:00...

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

Gozick, Brandon – Homework 8 – Due: Oct 6 2006, 5:00 pm – Inst: D Weathers 1 This print-out should have 11 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points A cheerleader lifts his 24 kg partner straight up off the ground a distance of 0 . 268 m before releasing her. The acceleration of gravity is 9 . 8 m / s 2 . If he does this 11 times, how much work has he done? Correct answer: 693 . 37 J. Explanation: The work done in lifting the cheerleader once is W 1 = m g h = (24 kg)(9 . 8 m / s 2 )(0 . 268 m) = 63 . 0336 J . The work required to lift her n = 11 times is W = n W 1 = (11)(63 . 0336 J) = 693 . 37 J . keywords: 002 (part 1 of 1) 10 points A man cleaning his apartment pushes a vac- uum cleaner with a force of magnitude 24 . 6 N. The force makes an angle of 16 . 2 with the hor- izontal floor. The vacuum cleaner is pushed 2 . 01 m to the right along the floor. Calculate the work done by the 24 . 6 N force. Correct answer: 47 . 4827 J. Explanation: Using the definition of work, we have W = ~ F · ~s = F s cos θ = (24 . 6 N) (2 . 01 m) cos 16 . 2 = 47 . 4827 J . Note: The normal force N , the weight m~g , and the upward component of the applied force, (24 . 6 N) sin 16 . 2 , does no work because they are perpendicular to the displacement. keywords: 003 (part 1 of 3) 0 points A cart loaded with bricks has a total mass of 9 . 3 kg and is pulled at constant speed by a rope. The rope is inclined at 21 . 2 above the horizontal and the cart moves 30 . 9 m on a horizontal floor. The coefficient of kinetic friction between ground and cart is 0 . 6 .

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.

{[ snackBarMessage ]}

### Page1 / 4

Homework 8 - Gozick Brandon Homework 8 Due Oct 6 2006 5:00...

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

View Full Document
Ask a homework question - tutors are online