&iacute;…&igrave;‚&not;&igrave;Š&curren;6&iacute;šŒ&igrave;†”&euml;&pound;&uml;&igrave;…˜

# í…ì‚¬ìŠ¤6íšŒì†”ë£¨ì…˜

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

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.

Unformatted text preview: min (mm64262) – Homework 6 – lee – (GEDB00864) 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points The speed of a moving bullet can be deter- mined by allowing the bullet to pass through two rotating paper disks mounted a distance 64 cm apart on the same axle. From the angular displacement 25 . 6 ◦ of the two bul- let holes in the disks and the rotational speed 1403 rev / min of the disks, we can determine the speed of the bullet. 25 . 6 ◦ v 1403 rev / min 64 cm What is the speed of the bullet? Correct answer: 210 . 45 m / s. Explanation: Let : ω = 1403 rev / min , d = 64 cm , and θ = 25 . 6 ◦ . θ = ω t t = θ ω , so the speed of the bullet is v = d t = d ω θ = (64 cm) (1403 rev / min) 25 . 6 ◦ × 360 ◦ 1 rev 1 m 100 cm 1 min 60 s = 210 . 45 m / s . keywords: 002 10.0 points A bicycle is turned upside down while its owner repairs a flat tire. A friend spins the other wheel of radius 0 . 4 m and observes that drops of water fly off tangentially. She mea- sures the height reached by drops moving ver- tically. A drop that breaks loose from the tire on one turn rises 38 . 7 cm above the tangent point. A drop that breaks loose on the next turn rises 35 cm above the tangent point (the angular speed of the wheel is decreasing). h . 4 m radius ω Find the angular deceleration of the wheel. The acceleration of gravity is 9 . 8 m / s 2 . As- sume the angular deceleration is constant. Correct answer: 0 . 360685 rad / s 2 . Explanation: Let : r = 0 . 4 m , h 1 = 38 . 7 cm = 0 . 387 m , h 2 = 35 cm = 0 . 387 m , and Δ θ = 1 rev = 2 π ....
View Full Document

{[ snackBarMessage ]}

### Page1 / 5

í…ì‚¬ìŠ¤6íšŒì†”ë£¨ì…˜

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

View Full Document
Ask a homework question - tutors are online