Neco Model Questions Vol1 2017 Physics Question 30

Practice objective / multiple choice question 30 from the 2017 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2017 Physics Objective / Multiple Choice Medium Difficulty
Question 30 NECO_MODEL_QUESTIONS_VOL1 • 2017 • PHYSICS • objective

A motor lifts a \(500\ \text{kg}\) load vertically through a height of \(20\ \text{m}\) in \(10\ \text{s}\). The motor operates at an efficiency of \(80\%\). (a) What is the mechanical power output of the motor? (b) What is the electrical power input? (c) What average upward force does the motor exert on the load?

Answer Options

A. (a) \(8.2\ \text{kW}\); (b) \(10.25\ \text{kW}\); (c) \(4.0\times10^{3}\ \text{N}\)
Correct Answer B. (a) \(9.8\ \text{kW}\); (b) \(12.25\ \text{kW}\); (c) \(4.9\times10^{3}\ \text{N}\)
C. (a) \(10.0\ \text{kW}\); (b) \(12.5\ \text{kW}\); (c) \(5.0\times10^{3}\ \text{N}\)
D. (a) \(11.8\ \text{kW}\); (b) \(14.75\ \text{kW}\); (c) \(5.9\times10^{3}\ \text{N}\)
Correct Answer
B
Correct Option:
(a) \(9.8\ \text{kW}\); (b) \(12.25\ \text{kW}\); (c) \(4.9\times10^{3}\ \text{N}\)

About This Question

This is Neco Model Questions Vol1 2017 Physics Question 30. It is one of the objective questions from the 2017 Neco Model Questions Vol1 Physics examination.

Difficulty level: Medium .

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