Question
A block and tackle has a velocity ratio of 4 and it is used to vertically raise a load of mass 50kg.if the effciency is 80%,determine the minimum effort reguired to raise the load.
Answers
Velocity ratio (V.R) is:
distanced moved by effort / distance moved by by load
Mechanical Advantage (M.A)
=Load/Effort
Efficiency = M.A/V.R
In the problem:
Velocity Ratio = 4
Efficiency = 0.80
Load = 50kg * 9.81m/s^2 = 490.5N
Using the formula:
Efficiency = M.A / V.R
=> .80 = M.A / 4
=> M.A = 3.2
Now,
M.A = Load/Effort
3.2 = 490.5 / Effort
Effort ?
distanced moved by effort / distance moved by by load
Mechanical Advantage (M.A)
=Load/Effort
Efficiency = M.A/V.R
In the problem:
Velocity Ratio = 4
Efficiency = 0.80
Load = 50kg * 9.81m/s^2 = 490.5N
Using the formula:
Efficiency = M.A / V.R
=> .80 = M.A / 4
=> M.A = 3.2
Now,
M.A = Load/Effort
3.2 = 490.5 / Effort
Effort ?
-487.3
487.3
153.28
_143
493.7
153.28
156.25
Related Questions
Draw a block and tackle system of pulleys with a velocity ratio of 5 is used to raise a mass of a 25...
Draw a block and tackle system of pulleys with a velocity ratio of 5.A block and tackle with a veloc...
A block and tackle system has 3 pulley in the upper fixed block and 2 pulley in the lower movable bl...