phyhw13 - valdez (vv689) Homework 13 florin (58140) 1 This...

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

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: valdez (vv689) Homework 13 florin (58140) 1 This print-out should have 10 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 75 cm apart on the same axle. From the angular displacement 23 . 4 of the two bul- let holes in the disks and the rotational speed 1396 rev / min of the disks, we can determine the speed of the bullet. 23 . 4 v 1396 rev / min 75 cm What is the speed of the bullet? Correct answer: 268 . 462 m / s. Explanation: Let : = 1396 rev / min , d = 75 cm , and = 23 . 4 . = t t = , so the speed of the bullet is v = d t = d = (75 cm) (1396 rev / min) 23 . 4 360 1 rev 1 m 100 cm 1 min 60 s = 268 . 462 m / s . keywords: 002 10.0 points A bug is on the rim of a 78 rev / min, 12 in . diameter record. The record moves from rest to its final angular speed in 3 . 37 s. Find the bugs centripetal acceleration 1 . 5 s after the bug starts from rest. (1 in = 2.54 cm). Correct answer: 2 . 01444 m / s 2 . Explanation: Let : w = 78 rev / min , t = 3 . 37 s , r = 6 in , and t = 1 . 5 s . = t , so = t = t t = 78 rev / min 3 . 37 s (1 . 5 s) 1 min 60 s = 3 . 63567 rad / s , and a r = v 2 t r = r 2 = (6 in)(3 . 63567 rad / s) 2 1 cm 2 . 54 in 1 m 100 cm = 2 . 01444 m / s 2 . 003 10.0 points A small wheel of radius 1 . 6 cm drives a large wheel of radius 15 cm by having their circum- ferences pressed together....
View Full Document

Page1 / 5

phyhw13 - valdez (vv689) Homework 13 florin (58140) 1 This...

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

View Full Document Right Arrow Icon
Ask a homework question - tutors are online