- #1

jeffrey

- 13

- 2

- Homework Statement
- Suppose mass mL has a constant vertical speed v while hoisting, block B is stationary. In that case, calculate the rotational speeds ωQ, ωR and ωS of discs Q, R and S expressed in v and D. Define clockwise as positive

- Relevant Equations
- v=omega*radius

length_a+length_b= constant

Further given:

- every beam is infinite stiff

- pulleys are massless

- cables don't stretch, no slip, and frictionless.

-Every pulley has a diameter D except pulley Q. Pulley Q has diameter 0.5*D

So what I don't understand is how to calculate/determine the velocity at R and S. Can someone help me or send me into the right direction? I know from the answers that the velocity at R is 2v and at C is 1v, but I don't understand why.

- every beam is infinite stiff

- pulleys are massless

- cables don't stretch, no slip, and frictionless.

-Every pulley has a diameter D except pulley Q. Pulley Q has diameter 0.5*D

So what I don't understand is how to calculate/determine the velocity at R and S. Can someone help me or send me into the right direction? I know from the answers that the velocity at R is 2v and at C is 1v, but I don't understand why.