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Concepts Of Physics MCQ Edition [Volume 1]

Exam: Concepts Of Physics MCQ Edition [Volume 1]
Subject: Physics
Chapter: Introduction to Physics

Concepts Of Physics MCQ Edition [Volume 1] · Physics · Introduction to Physics

The average speed of a snail is 0.020 miles/hour, whereas that of a...

The average speed of a snail is

0.020

miles/hour, whereas that of a leopard is

70

miles/hour. Determine these speeds in SI units.

Options

A $0.89 \text{ m/s}$ , $310 \text{ m/s}$
B $0.0055 \text{ m/s}$ , $19 \text{ m/s}$
C $0.032 \text{ m/s}$ , $112 \text{ m/s}$
D $0.0089 \text{ m/s}$ , $31 \text{ m/s}$

Correct answer

D. $0.0089 \text{ m/s}$ , $31 \text{ m/s}$

Step-by-step solution

The SI unit of speed is

\text{m/s}

.

We know that

1 \text{ mile} \approx 1609 \text{ m}

and

1 \text{ hour} = 3600 \text{ s}

.

The conversion factor from

\text{miles/hour}

to

\text{m/s}

is

\dfrac{1609}{3600} \approx 0.447 \text{ m/s}

.

Speed of the snail

= 0.020 \text{ miles/hour} = 0.020 \times 0.447 \text{ m/s} \approx 0.0089 \text{ m/s}

.

Speed of the leopard

= 70 \text{ miles/hour} = 70 \times 0.447 \text{ m/s} \approx 31 \text{ m/s}

.

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