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
Unformatted text preview: Version One Homework 7 savrasov 39822 Nov 13, 2007 1 This printout should have 9 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. The due time is Central time. Serway CP 07 18 10:02, trigonometry, numeric, > 1 min, nor mal. 001 (part 1 of 3) 1 points A race car starts from rest on a circular track of radius 400 m. The cars speed increases at the constant rate of 0 . 5 m / s 2 . At the point where the magnitudes of the radial and tangential accelerations are equal, determine the speed of the race car. Correct answer: 14 . 1421 m / s. Explanation: Given : r = 400 m , v i = 0m / s , and a t = 0 . 5 m / s 2 . a t = a c = v 2 f r v f = a t r = q (0 . 5 m / s 2 )(400 m) = 14 . 1421 m / s . 002 (part 2 of 3) 1 points Find the distance traveled at the same mo ment. Correct answer: 200 m. Explanation: Linear and angular velocities are related by v = r . The velocity is given by v f 2 = v i 2 + 2 a t s = 2 a t s since v i = 0, so s = v f 2 2 a t = (14 . 1421 m / s) 2 2(0 . 5 m / s 2 ) = 200 m . 003 (part 3 of 3) 1 points Find the elapsed time at the same moment. Correct answer: 28 . 2843 s. Explanation: v f = v i + a t = a t since v i = 0, so t = v f a = 14 . 1421 m / s . 5 m / s 2 = 28 . 2843 s ....
View
Full
Document
This note was uploaded on 01/10/2010 for the course PHY na taught by Professor Richardscalettar during the Fall '09 term at UC Davis.
 Fall '09
 RichardScalettar
 Work

Click to edit the document details