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: truong (ajt2287) – HW#5 WorkEnergy – hester – (WVPHYSICSC2011) 1 This printout should have 17 questions. Multiplechoice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Five ramps lead from the ground to the second floor of a workshop, as sketched below. All five ramps have the same height; ramps B, C, D and E have the same length; ramp A is longer than the other four. You need to push a heavy cart up to the second floor and you may choose any one of the five ramps. A B C D E Assuming no frictional forces on the cart, which ramp would require you to do the least work? 1. Ramp B. 2. Same work for ramps B, C, D or E; more work for ramp A. 3. Same work for the straight ramps A and B; less work for ramps C, D, and E. 4. Unable to determine without knowing the exact profiles of ramps C, D or E. 5. Ramp C. 6. Ramp D. 7. Ramp E. 8. Ramp A. 9. Same work for all five ramps. 002 10.0 points A particle of mass m moves along the x axis. Its position varies with time according to x = (2 m / s 3 ) t 3 + ( 2 m / s 2 ) t 2 . What is the work done by the force from t = 0 to t = t 1 ? 1. W = 2 mt 2 1 bracketleftBig (144 m / s 6 ) t 2 1 +( 120 m / s 5 ) t 1 + (25 m / s 4 ) bracketrightBig 2. W = 81 2 mt 2 1 bracketleftBig (9 m / s 6 ) t 2 1 +( 12 m / s 5 ) t 1 + (4 m / s 4 ) bracketrightBig 3. W = 2 mt 2 1 bracketleftBig (9 m / s 6 ) t 2 1 +( 42 m / s 5 ) t 1 + (49 m / s 4 ) bracketrightBig 4. W = 1 2 mt 2 1 bracketleftBig (225 m / s 6 ) t 2 1 +( 480 m / s 5 ) t 1 + (256 m / s 4 ) bracketrightBig 5. W = 81 2 mt 2 1 bracketleftBig (1 m / s 6 ) t 2 1 +( 4 m / s 5 ) t 1 + (4 m / s 4 ) bracketrightBig 6. W = 2 mt 2 1 bracketleftBig (9 m / s 6 ) t 2 1 +( 12 m / s 5 ) t 1 + (4 m / s 4 ) bracketrightBig 7. W = 8 mt 2 1 bracketleftBig (9 m / s 6 ) t 2 1 +( 24 m / s 5 ) t 1 + (16 m / s 4 ) bracketrightBig 8. W = 1 2 mt 2 1 bracketleftBig (81 m / s 6 ) t 2 1 +( 252 m / s 5 ) t 1 + (196 m / s 4 ) bracketrightBig 9. W = 25 2 mt 2 1 bracketleftBig (9 m / s 6 ) t 2 1 +( 12 m / s 5 ) t 1 + (4 m / s 4 ) bracketrightBig 10. W = 8 mt 2 1 bracketleftBig (9 m / s 6 ) t 2 1 +( 12 m / s 5 ) t 1 + (4 m...
View
Full
Document
This note was uploaded on 11/27/2011 for the course SPANISH 101 taught by Professor Steve during the Spring '11 term at Baptist College of Health Sciences.
 Spring '11
 Steve
 Spanish

Click to edit the document details