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Concepts Of Physics MCQ Edition [Volume 1]

Exam: Concepts Of Physics MCQ Edition [Volume 1]
Subject: Physics
Chapter: Work and Energy

Concepts Of Physics MCQ Edition [Volume 1] · Physics · Work and Energy

A small block of mass 200 g is situated at the top of a...

A small block of mass

200 \text{ g}

is situated at the top of a frictionless incline which is

10 \text{ m}

long and

3.2 \text{ m}

high. Determine the work required to lift the block from the ground and place it at the top. Take

g = 10 \text{ m/s}^2

.

Options

A $20 \text{ J}$
B $64 \text{ J}$
C $3.2 \text{ J}$
D $6.4 \text{ J}$

Correct answer

D. $6.4 \text{ J}$

Step-by-step solution

Mass of the block,

m = 200 \text{ g} = 0.2 \text{ kg}

Height of the incline,

h = 3.2 \text{ m}

Acceleration due to gravity,

g = 10 \text{ m/s}^2

The work required to lift the block from the ground to the top of the incline is equal to the change in its gravitational potential energy.

W = mgh

W = 0.2 \times 10 \times 3.2

W = 6.4 \text{ J}

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