JAMB CBT Software 2025 - Free Download
JAMB CBT Mobile App 2025 - Free Download

The diagram shown represents a block-and-tackle pulley system on which an effort of W Newtons...

Physics
JAMB 2018

The diagram shown represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40, then the value of W is?

  • A. 28.0
  • B. 48.0N
  • C. 233.0N
  • D. 50.0N
JAMB CBT Mobile App 2025 - Free Download
JAMB CBT 2025 - Candidates, Schools, Centres, Resellers - Get Ready!
JAMB CBT Software 2025 - Free Download
Myschool's prices for products & services are going up again in February - Buy what you need now
Correct Answer: Option D
Explanation

Given Data:

Efficiency = 40% Load = 120N, V.R = 6 (Number of Pulleys)

Efficiency = \(\frac{M.A}{V.R} * 100\)

40 = \(\frac{M.A}{6} * 100\)

6 * 40 = 100 M.A

M.A = \(\frac{240}{100}\) → 2.4

Where M.A = \(\frac{Load}{Effort}\) 

2.4 = \(\frac{120}{Effort}\)

: Effort = \(\frac{120}{2.4}\)  → 50N

There is an explanation video available below.


Report an Error Ask A Question Download App
JAMB CBT Software 2025 - Free Download
JAMB CBT Mobile App 2025 - Free Download
JAMB CBT 2025 - Candidates, Schools, Centres, Resellers - Get Ready!
Myschool's prices for products & services are going up again in February - Buy what you need now

Explanation Video

JAMB CBT Mobile App 2025 - Free Download
JAMB CBT Software 2025 - Free Download
JAMB CBT 2025 - Candidates, Schools, Centres, Resellers - Get Ready!
Myschool's prices for products & services are going up again in February - Buy what you need now

Contributions ({{ comment_count }})

Please wait...

{{ settings.no_comment_msg ? settings.no_comment_msg : 'There are no comments' }}

Quick Questions

Post your Contribution

Please don't post or ask to join a "Group" or "Whatsapp Group" as a comment. It will be deleted. To join or start a group, please click here

{{ quote.posted_by.display_name }}
{{ settings.form_textarea_description }}
 
JAMB CBT Mobile App 2025 - Free Download
JAMB CBT Software 2025 - Free Download
JAMB CBT 2025 - Candidates, Schools, Centres, Resellers - Get Ready!
Myschool's prices for products & services are going up again in February - Buy what you need now
JAMB CBT 2025 - Candidates, Schools, Centres, Resellers - Get Ready!
JAMB CBT Software 2025 - Free Download
JAMB CBT Mobile App 2025 - Free Download