What is the pressure exerted by a boy

weighing 80kg on the ground when he stands

on his feet whose area is 200cm2 ?

A. 80 pa

B. 1600 pa

C. 40,000 pa

D. 400 pa

The answer is C. 40,000 pa

Explanation:

Given

Mass ( m) = 80 kg

Area ( A) = 200 cm^2

= 0.02 m^2

g = 10 m/s^2

First calculating Force (F)

= m * g

= 80 * 10

= 800 N

Now

Pressure (P) = F/ A

= 800/0.02

= 40,000 pa

from

explanation:

wind is defined by the direction it blows from.   for example, a wind blowing from north to south is called a northerly wind.

igneous rocks also form where plates converge. the subducting plate melts as it sinks into the crust of the earth, and the melt rises into the overriding plate forming volcanoes. metamorphic rocks are formed mainly in the lithosphere, wherever there is high pressure and high temperature. -woods