Question icon
Grade 12th passMechanics

In adjacent figure Pulley p1 is fixed and Pulley P2 is movable if w 1 = w 2 = 100 Newton ,what is the angle A p2p1? the pulleys are frictionless:

Question image for In adjacent figure Pulley p1 is fixed and Pulley
Profile image of Muskan
8 Years agoGrade 12th pass
Answers icon

1 Answer

Profile image of Venkat
8 Years ago
Assume tension in string AP2 and P2P1 as T.
Balance the force on pulley  P  → T =W1
Let the angle AP2P1  be 2 theta.
consider forces on  P2
2Tcos(theta) = W2
2W1cos(theta) = W2
As weights are same -->cos(theta)=1/2 → theta = 60  degrees
So angle AP2Pis = 2 x 60 =120 degrees
Option (4)...