Amassless, rigid board is placed across two bathroom scales that are separated by a distance of 1.71 m. a person lies on the board. the scale under his head reads 475 n, and the scale under his feet reads 316 n. (a) find the weight of the person. (b) locate the center of gravity of the person relative to the scale beneath his head.

Let the weight of the person be W and be located at a distance 'a' from the left scale as shown in the figure

Since the body is in equilibrium we can use equations of statics to analyse the problem.

Taking Sum of Moments about A we have

Taking Sum of Moments about B we have

Solving the above 2 equations for W and 'a' we get

if they have a finite resultant

answer: the metamorphic rocks are formed when they are exposed to high pressure and high temperatures. this happens when one of the earth's plates comes in contact with the other plate by traveling in opposite directions, straight into each other or slipping under one another. the friction that is caused by this activity results in   melting of rocks and when it cools they are known as metamorphic rocks. this process needs a controlled amount of pressure and temperature otherwise it may turn into magma.