A worker has to raise a heavy load to a certain height. Four ideal machines are available. Their mechanical advantages are given below: Machine P: MA = 0.5 Machine Q: MA = 0.8 Machine R: MA = 2 Machine S: MA = 4 Assume all machines are frictionless and the load must be lifted through the same vertical height. Which of the following statements is correct?

Question

A worker has to raise a heavy load to a certain height. Four ideal machines are available. Their mechanical advantages are given below: Machine P: MA = 0.5 Machine Q: MA = 0.8 Machine R: MA = 2 Machine S: MA = 4 Assume all machines are frictionless and the load must be lifted through the same vertical height. Which of the following statements is correct? — Exam MCQ

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B. Machine S requires the least effort but the effort moves through the greatest distance. — The correct choice is Machine S requires the least effort but the effort moves through the greatest distance.. It follows from the relevant Newtonian mechanics, motion, work, energy, power or simple-machine relationship.

rrbjepyq.in · Answer

A. Machines R and S require the same effort since the load is unchanged.

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C. Machine P requires the least effort because it has the smallest MA.

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D. Machine S performs less work than the other machines.

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