Neco Model Questions Vol1 2020 Physics Question 14

Practice objective / multiple choice question 14 from the 2020 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2020 Physics Objective / Multiple Choice Medium Difficulty
Question 14 NECO_MODEL_QUESTIONS_VOL1 • 2020 • PHYSICS • objective

A block‑and‑tackle system has an ideal mechanical advantage of 4. When it is used to lift a load of \(800\,\text{N}\), the required input force is measured to be \(250\,\text{N}\). (a) Determine the efficiency of the system (as a percentage). (b) Assuming the same efficiency, calculate the input force needed to lift a \(1200\,\text{N}\) load with the same system.

Answer Options

A. Efficiency = 70 %; Input force for 1200 N load = 450 N
B. Efficiency = 75 %; Input force for 1200 N load = 400 N
Correct Answer C. Efficiency = 80 %; Input force for 1200 N load = 375 N
D. Efficiency = 85 %; Input force for 1200 N load = 360 N
Correct Answer
C
Correct Option:
Efficiency = 80 %; Input force for 1200 N load = 375 N

About This Question

This is Neco Model Questions Vol1 2020 Physics Question 14. It is one of the objective questions from the 2020 Neco Model Questions Vol1 Physics examination.

Difficulty level: Medium .

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