M A = 3 kg, M B = 4 kg and M C = 8 kg. Friction coefficient between any two surfaces is 0.25. Pulley is frictionless and string is massless. block, A is connected to the wall through a horizontal massless rigid rod as shown in figure. (g=10m/s 2 )
(i) Find the value of F to keep C moving with constant speed
Correct Answers for Comprehension Sub-Questions
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Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(i) 
f 1 = 3 × 0.25 × 10 = 7.5
F = 17.5 + 25 + 37.5 = 80 N
(ii) If F = 200 then a B = a C
T – f 1 – f 2 = m B a.........
F – T – f 2 – f 3 = m C a........
from equation and
F – f 1 – 2f 2 – f 3 = (m B + m C ) a
= 
= 
10 m/sec 2
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