hw 15 sol

# hw 15 sol - Patel(pnp223 homework 15 Turner(92160 This...

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

Patel (pnp223) – homework 15 – Turner – (92160) 1 This print-out should have 12 questions. Multiple-choice questions may continue on the next column or page – fnd all choices beFore answering. 001 (part 1 oF 2) 10.0 points Given: A block is pulled at a constant speed along a horizontal surFace by a rope with ten- sion F T . The rope is inclined at an angle From the horizontal as shown in the fgure below. The block moves a distance 13 m along the horizontal surFace. The acceleration oF gravity is 9 . 8 m / s 2 . 39 kg μ = 0 . 63 F T 43 What is the net work done by all the Forces acting on the block? 1. W net = - 1838 . 74 J 2. W net = 0 correct 3. W net = - 4968 . 6 J 4. W net = 4968 . 6 J 5. W net = 3130 . 22 J 6. W net = - 3130 . 22 J 7. W net = 1971 . 81 J Explanation: Because the block is moving at a constant speed, the net Force on it is zero. So the net work is also zero. 002 (part 2 oF 2) 10.0 points Suppose that the Force on the block F T is in- creased so that the block accelerates (starting From rest) at a = 1 . 6 m / s 2 . Now what is the net work done by all the Forces acting on the block as it moves a dis- tance oF 13 m? 1. W net = 1971 . 81 J 2. W net = - 811 . 2 J 3. W net = - 1971 . 81 J 4. W net = 2482 . 81 J 5. W net = 811 . 2 J correct 6. W net = 1460 . 81 J Explanation: Let L = 13 m . W = Δ K = 1 2 m Δ v 2 = 1 2 m (2 aL ) = maL = (39 kg) (1 . 6 m / s 2 ) (13 m) = 811 . 2 J . 003 (part 1 oF 2) 10.0 points An amusement park ride consists oF a rotating circular platForm 9 . 68 m in diameter From which 10 kg seats are suspended at the end oF 3 . 37 m massless chains. When the system rotates, the chains make an angle oF 21 . 9 with the vertical. The acceleration oF gravity is 9 . 8 m / s 2 . θ l d What is the speed oF each seat?

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

hw 15 sol - Patel(pnp223 homework 15 Turner(92160 This...

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

View Full Document
Ask a homework question - tutors are online