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: xu (xx638) Homework #10 nevils (77401) 1 This printout should have 21 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points A 2 . 8 kg block is pushed 1 . 34 m up a vertical wall with constant speed by a constant force of magnitude F applied at an angle of 60 . 4 with the horizontal. The acceleration of gravity is 9 . 8 m / s 2 . 2 . 8 kg F 6 . 4 If the coefficient of kinetic friction between the block and wall is 0 . 561, find the work done by F . Answer in units of J. 002 (part 1 of 2) 10.0 points A frictionless roller coaster is given an ini tial velocity of v at height h = 21 m . The radius of curvature of the track at point A is R = 31 m. The acceleration of gravity is 9 . 8 m / s 2 . R 2 3 h h h v A B Find the maximum value of v so that the roller coaster stays on the track at A solely because of gravity. Answer in units of m / s. 003 (part 2 of 2) 10.0 points Using the value of v calculated in question 1, determine the value of h that is necessary if the roller coaster just makes it to point B. Answer in units of m. 004 10.0 points A particle of mass m moves along the x axis. Its position varies with time according to x = (8 m / s 3 ) t 3 + ( 7 m / s 2 ) t 2 . What is the power delivered to the particle at any time t ? 1. P = 144 mt bracketleftBig (8 m / s 6 ) t 2 +( 6 m / s 5 ) t + (1 m / s 4 ) bracketrightBig 2. P = 2 mt bracketleftBig (81 m / s 6 ) t 2 +( 189 m / s 5 ) t + (98 m / s 4 ) bracketrightBig 3. P = 2 mt bracketleftBig (81 m / s 6 ) t 2 +( 216 m / s 5 ) t + (128 m / s 4 ) bracketrightBig 4. P = 2 mt bracketleftBig (729 m / s 6 ) t 2 +( 405 m / s 5 ) t + (50 m / s 4 ) bracketrightBig 5. P = 32 mt bracketleftBig...
View
Full
Document
This note was uploaded on 12/10/2010 for the course PHY 101L taught by Professor None during the Spring '08 term at University of Texas at Austin.
 Spring '08
 None
 Work

Click to edit the document details