Question

< Homework #4 Problem 13.19 © 20f 5 > A Review A 37-lb suitcase slides 20 ft down the ramp. The suitcase has an initial velocity down the ramp of 15 ft/s and the coefficient of kinetic friction along AB is Ilk = 0.16. (Figure 1) Part A How long does it take to go from A to C? Express your answer to three significant figures and include the appropriate units. t = 1.21 s Figure (< 1 of 1 > Submit Previous Answers ✓ Correct 20 1L Part B Determine the point where it strikes the ground at C. Express your answer to three significant figures and include the appropriate units. R= | Value 1 Units PPearson

Answer 1

pag (1) Uk WGSO - 7. Sin V.. Up = 0.16 V. -15414 . F r WE Z ZIL . EF=ma along AB A Ef = ma m = W = 37 = 1149 sleeg / 9 32.2 + Now wsino - UK w Coso = ma D a= W Sino - UK WGSO щ. & 37 Sim 300 -0.16X37X6os o 1.149 Ta= 11.639 4/52

page 2 Now n of Motion along AB - S= uit that? * 20=15tt 1 x 11.639x+² 2 5.819++15-20 = 0 t = -3.5465 2 t=0.9695 Time can't be negative t pom AB=to=/0.9695 Now Vertical component of relocity at B = Ve Sino VB = Uo tat 515 +11.639 x 0.969 Up = 96.278 ft/s] Vy = Ub Sat30 + 13.139 4/5

- pace 3 Now direta in from of motion B to c along vectical - s = ut + hgt² ► y = 13.139 xt +\x322 xt? 16.1+2 + 13.1394 -4 = 0 on soking. t = -1.052 , t = 0.236 5 time can't se negatine time from B 1 Total to C = t2 = 0.236 - time from A to C = ta+tz = 0.969 + 0.236 = 1.205 =(1.215) UBxXtz Sie horizontal ) . ? Component Xtz) - R = » R= UB los 30° x tz = 26.278 X 6s 30° x 0.236 IR = 5.371 ft 7 it where it Stikes