A boy stands on the ground. The area below his feet is $70 c m^{2}$ . The pressure he exerts on the ground is $7 N / c m^{2}$ . Calculate the total force acting on the ground.

0.1 N

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10 N

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490 N

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4.9 N

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Solution

The correct option is C $490 N$
The pressure is given as Force/Area.
In this case, the area = $70 {c m}^{2}$ and the presure acting is $7 N / {c m}^{2}$ .
Therefore, $F o r c e = P r e s s u r e \times A r e a = 7 N / {c m}^{2} \times 70 {c m}^{2} = 490 N$ .
Hence, the total force acting on the ground is 490 N.

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A boy stands on the ground. The area below his feet is 70cm2. The pressure he exerts on the ground is 7N/cm2. Calculate the total force acting on the ground.

The correct option is C 490NThe pressure is given as Force/Area.In this case, the area =70cm2and the presure acting is 7N/cm2.Therefore, Force=Pressure×Area=7N/cm2×70cm2=490N.Hence, the total force acting on the ground is 490 N.

A boy stands on the ground. The area below his feet is $70 c m^{2}$ . The pressure he exerts on the ground is $7 N / c m^{2}$ . Calculate the total force acting on the ground.