By lubricating the pulley, the work needed was decreased from 50 J down to 44 J. The output work of the pulley remained 40 J. The efficiency of the pulley AFTER lubrication is

My account
Edit my Profile
Private messages
My favorites

Ask a Question
Questions
Tags
Categories
Ask a Question

Mauritz Hansen asked Oct 18, 2023

316,066 views

2 votes

By lubricating the pulley, the work needed was decreased from 50 J down to

44 J. The output work of the pulley remained 40 J.
The efficiency of the pulley AFTER lubrication is

Physics
high-school

Mauritz Hansen asked Oct 18, 2023

by Mauritz Hansen

2.6k points

0 Comments

Your comment on this question:

Email me at this address if a comment is added after mine:Email me if a comment is added after mine

Privacy: Your email address will only be used for sending these notifications.

Your answer

Email me at this address if my answer is selected or commented on:Email me if my answer is selected or commented on

Privacy: Your email address will only be used for sending these notifications.

1 Answer

12 votes

Before lubrication:

$\tt (40)/(50)* 100\%=80\%$

The efficiency of the pulley after lubrication becomes:

$\tt (40)/(44)* 100\%=91\%$

Recep answered Oct 24, 2023

by Recep

3.0k points

0 Comments

Your comment on this answer:

Email me at this address if a comment is added after mine:Email me if a comment is added after mine

Privacy: Your email address will only be used for sending these notifications.

Ask a Question

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

1.6m questions

2.0m answers

0 Comments

Your comment on this question:

Your answer

1 Answer

0 Comments

Your comment on this answer:

Other Questions