MyQuestionIcon

1

You visited us 1 times! Enjoying our articles? Unlock Full Access!

Work Done by Force of Gravity

A block and t...

Question

A block and tackle system of 5 pulleys is used to raise a load of 50 kgf steadily through a height of 20 m. The work done against friction is 2000J. Calculate the work done by the effort

A

12000 J

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

B

16000 J

No worries! We‘ve got your back. Try BYJU‘S free classes today!

C

20000 J

No worries! We‘ve got your back. Try BYJU‘S free classes today!

D

8000 J

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is:D:12000 J
Given Data:
Number of pully, $= 5$
Load of one object, $= 50 k g f = 50 \times 10 = 500 N$
Hight of lifting the load, $= 20 m$
Work done to lift the load, $500 N \times 20 m = 10000 J$
Work done against friction, $W_{f} = 2000 J$
Total work done, $= W_{f} + W_{L} = 2000 + 10000 = 12000 J$

Suggest Corrections

thumbs-up

45

Similar questions

A block and tackle system of 5 pulleys is used to raise a load of 50 kgf steadily through a height of 20 m. Calculate the effort and MA

Q. A machine raises a load of

750 N

through a height of

16 m

5 s

. Calculate work done by machine:

Q. 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 the efficiency of the system.

Q. 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 the velocity ratio.

A block and tackle system has 5 pulleys. If an effort of 1250 N is needed in the downward direction to raise a load of 5000 N calculate(a) M.A. (b) V.R.(c)efficiency of the system. Also find the magnitude of extra force needed to overcome the friction.

View More

Join BYJU'S Learning Program

similar_icon

Related Videos

lock

Work done by the force of gravity

PHYSICS

Watch in App

explore_more_icon

Explore more

Work Done by Force of Gravity

Standard X Physics

Join BYJU'S Learning Program

CrossIcon