Question

solve these Questions Please
1. A force of 15 N is applied over a surface area of 0.6 m2
. What is the pressure?
2. Why do suit cases and school bags have broad straps?
3. If the area of head of a man is 10cm X 10cm. How much weight of air would be carrying on his head?
4. A rectangular box has weight 100 N when placed on a floor, the area of contact is found to be 5 m2.
Find the pressure exerted on the floor?

Answer 1

1)
$pressure = \frac{15}{0.6 } \\ = 24.10 \: pascal$
2) pressure is inversely proportional to area . Hence if there are broad straps in suit cases and school bags the pressure will be less on our solder and we can carry it without pain.
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Answer 2

2. Suit cases and school bags have broad straps as it reduces pressure because when the area increases pressure decreases.

4. force=100N

area=5m2

pressure=force/area=100N/5m2

                                 = 20 pascal 0r 20 N/m2

hope it helps you