# Physics

A block and tackle with a velocity ratio of 5 is used to raise a mass of 25kg through a vertical distances of 40cm at a steady rate.if the effort is equal to 60N,determine.(a)The distance moved by the effort.(b)The workdone by the effort in lifting the load.(c)The loss in energy involve in operating the machine.

1. 👍 5
2. 👎 1
3. 👁 1,302
1. If the block moves .40 meters then the line is pulled 5 * .4 = 2 meters (a)

the work done by the puller person on that line is
W in = 60 N * 2 meters = 120 Joules (b)

the useful work done on the block was to lift it .40 meters
work out = m g h = 25 * 9.81 * .4 = 98.1 Joules
so the loss due to friction was
120 - 98.1 = 21.9 Joules (c)

1. 👍 3
2. 👎 0
2. 16

1. 👍 3
2. 👎 0

## Similar Questions

1. ### Physics

A machine with velocity ratio of 5 was used to raise a load of 1.2kg mass through a height of 10m .If the work done to raise the load is 800J . Find the useful work output , efficiency of the machine

asked by Possible on June 20, 2020
2. ### Physics

A block of mass m = 2.00 kg is released from rest h = 0.500 m from the surface of a table, at the top of a theta = 30.0° incline. The frictionless incline is fixed on a table of height H = 2.00 m. (a) Determine the acceleration

asked by Edge on February 6, 2016
3. ### physics

A baseball of mass m1 = 0.32 kg is thrown at a concrete block m2 = 6.25 kg. The block has a coefficient of static friction of μs = 0.71 between it and the floor. The ball is in contact with the block for t = 0.195 s while it

asked by Anonymous on March 26, 2014
4. ### Physics

A block and tackle system consisting of 5 pulleys is used to raise a load of 400 N through a height of 10 m. If the work done against friction is 100 j, calculate

asked by fred on July 12, 2020
5. ### Physics

A 90 kg halfback runs north and is tackled by a 120 kg opponent running south at 4 m/s. The collision is perfectly inelastic. Just after the tackle, both players move at a velocity of 2 m/s north. Calculate the velocity of the 90

asked by Kevin on February 6, 2010
1. ### Physics

A block and tackle with a velocity ratio of 7 is used to raise a mass of 50kg through a vertical distance of 800mm at a steady rate. If the effort is equal to 110N. Determine (a) The distance moved by the effort. (b) The workdone

asked by Aaron on June 24, 2020
2. ### mabathoana high school maseru

A block and tackle system of 5 pulley is used to raise a load of 500N steady through a height of 20m the work done against friction is then 2000J. Calculate the work done By effort, efficiency and effort applied

asked by Mamoeletsi on August 27, 2015
3. ### physics

An 8.0 g bullet is fired horizontally into a 9 kg block of wood and sticks in it.The block,which is free to move,has a velocity of 40cm/s after impact.Find the initial velocity of a bullet. You know the momentum (total mass) of

asked by fluffy on September 23, 2006
4. ### Physics

A 2.50g bullet, traveling at a speed of 425m/s, strikes the wooden block of a ballistic pendulum. The block has a mass of 270g (a) find the speed of the bullet/block combination immediately after the collision (b) how high does

asked by CJ on March 2, 2007
5. ### physics

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.

asked by Anonymous on November 1, 2016