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Figure 6 represents a block-and-tackle pulley system…

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PHYSICS

Figure 2 represents a block- and-tackle pulley system

Figure 6 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. 28.0N

B. 48.0N

C. 288.0N

D. 50.0N

QUICK ANSWER…

D

DETAILS…  

This problem is a repeated question, (2018 JAMB-UTME physics question 10) we resolved it HERE

Now for the right answer to the above question:

  1. A is not the right answer.
  2. B is incorrect.
  3. C is incorrect.
  4. D is correct.

KEY-POINTS…

You may please note this/these:

  • Velocity ratio of a block and tackle pulley system is exactly equal to the number of pulleys in the machine.

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/ culled from 2020 JAMB-UTME physics past question 34 /

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