Question

10. A book has a mass of 400 g. The surface of the book in contact with a table has dimensions 0.10m x 0.20 m. The gravitational field strength g is 10 N/kg. What is the pressure exerted on the table due to the book? A 0.08 N/m? B 8.0 N/m C 20 N/m2 D 200 N/m

Answer 1

The pressure exerted on the table due to the book is 200 N/m².

The given parameters;

• mass of the book, m = 400 g = 0.4 kg
• dimension of the table,  = 0.10m x 0.20 m.
• gravitational field strength g =  10 N/kg.

The area of the table is calculated as follows;

A = 0.1 x 0.2 = 0.02 m²

The pressure exerted on the table due to the book is calculated as follows;

$P = \frac{F}{A}$

where;

• F is the force of the book due to its weight

$P =\frac{F}{A} = \frac{mg}{A} = \frac{0.4 \times 10}{0.02} = 200 \ N/m^2$

Thus, the pressure exerted on the table due to the book is 200 N/m².

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