Problem 6.66 Two blocks are connected by a very light string passing over a mass
ID: 1440855 • Letter: P
Question
Problem 6.66 Two blocks are connected by a very light string passing over a massless and otonless puiey Figure The 200-N 20.0 Part A Find the work done on200Nblock rthere is no feeton between the talle and ee 200 Nbaock Part B Find the touw work done on 120-N block there is no friction between the table and the 20oN block Part C Find the total work done on 20o-Nblock i H, 500 and wk o32sbetween the table and the 200-N block. 7.45 My Answers give up Incorrect Try Again: 4 attempts remaining Part D Find the total work done on 120NblookirH,-0.500 and Mk 0325 between the table and the 200N block.Explanation / Answer
c)
1st find the acceleration , a
a = net force / net mass
= (12 - miuk*m*g)/(m1+m2)
= (12 - 0.325*20) / (20+12)/9.8
= (5.5) / 3.265
= 1.68 m/s^2
taken 12 N object, find T
12-T= m1*a
12 - T = (12/9.8)*1.68
T = 9.94 N
Net force on 20 N = T -fk = 9.94 - 0.325*20 = 3.44 N
W = net force * displacement
= 3.44 *0.75
=2.58 J