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A machine whose efficiency is 75% is used to lift a load of 1000N. Calculate...

Physics
JAMB 2014

A machine whose efficiency is 75% is used to lift a load of 1000N. Calculate the effort put in to the machine if it has a Velocity ratio of 4.
  • A. 343.32N
  • B. 233.33N
  • C. 333.33N
  • D. 334.33N
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Correct Answer: Option C
Explanation
\(\frac{MA}{VR}\times\frac{100}{1}=efficiency\)

\(\frac{L}{E}\frac{1}{VR}\times\frac{100}{1}=75\)

\(\frac{1000}{E}\frac{1}{4}\times\frac{100}{1}=75\)

\(E = \frac{250 \times 100}{75}\)

E = 333.3N

There is an explanation video available below.


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WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Join your school's WhatsApp group
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts
WAEC Past Questions, Objective & Theory, Study 100% offline, Download app now - 24709
Join your school's WhatsApp group
NECO June/July 2024 - Get offline past questions & answers - Download objective & theory, all in one app 48789