Physics
In a block and tackle system consisting of 3 pulleys, a load of 75 kgf is raised with an effort of 25 kgf.
Find —
(i) the mechanical advantage,
(ii) the velocity ratio, and
(iii) the efficiency.
Related Questions
A fixed pulley is driven by a 100 kg mass falling at a rate of 8.0 m in 4.0 s. It lifts a load of 75.0 kgf.
Calculate —
(a) The power input to the pulley taking the force of gravity on 1 kg as 10 N.
(b) the efficiency of the pulley, and
(c) the height to which the load is raised in 4.0 s.
A single fixed pulley and a movable pulley both are separately used to lift a load of 50 kgf to the same height. Compare the efforts applied in an ideal situation.
A block and tackle system has 5 pulleys. If an effort of 1000 N is needed in the downward direction to raise a load of 4500 N,
Calculate —
(a)The mechanical advantage,
(b)The velocity ratio and,
(c)The efficiency of the system.
In figure draw a tackle to lift the load by applying the force in the downward direction.
(a) Mark in the diagram the direction of load L and effort E.
(b) If the load is raised by 1 m, through what distance will the effort move?
(c) State the number of strands of tackle supporting the load.
(d) What is the mechanical advantage of the system?