Pulleys Part 2

A man draws water from a well with a fixed pulley. The mass of bucket and water together is 6 kg. The woman applies a force of 70 N. Calculate the mechanical advantage

• 1

• 0.857

• 1.166

• 0.5

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 the efficiency of the pulley.

• 7.5%

• 75%

• 100%

• 85.5%

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 the power input to the pulley taking the force of gravity on 1 kg as 10 N

• 1000 W

• 10000 W

• 2000 W

• 20000 W

In a block and tackle system consisting of 4 pulleys, a load of 75 kgf is raised with an effort of 25 kgf. Find the mechanical advantage

• 1

• 2

• 3

• 4

In a block and tackle system consisting of 4 pulleys, a load of 75 kgf is raised with an effort of 25 kgf. Find the velocity ratio.

• 2

• 3

• 5

• 4

A pulley system has a velocity ratio 3. If lifts a load of 150 N by an effort of 60 N. Calculate its mechanical advantage. Is it ideal?

• M.A. = 3

  Yes, it is ideal.

• M.A. = 2.5

  No, it is not ideal.

• M.A. = 3

  No, it is not ideal.

• M.A. = 2.5

  Yes, it is ideal.

A combination pulley system has 5 pulleys: 1 fixed and 4 movable pulleys. What is the maximum MA of this system?

• 5

• 16

• 8

• 32

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 4000 N, find efficiency of the system.

• 40%

• 100%

• 80%

• 75%

You are given four pulleys and plenty of rope. Design the pulley system to achieve maximum mechanical advantage. What is the maximum Mechanical Advantage?

• 4

• 5

• 8

• 6