4. The Mariana trench is in the Pacific Ocean and has a depth of approximately 11,000 m. The density of seawater is approximately 1025 kg/m3. What force would someone experience at such depth?

Explanation:

It is known that relation between pressure and density is as follows.

            P =

where,    P = pressure

      = density

            g = acceleration due to gravity

            h = height

Putting the given values into the above formula as follows.

              P =

                 =

                 = 110495000 Pa

Now, relation between pressure and force is as follows.

                P =

or,            F = PA

                F =

                   =

Thus, we can conclude that a force of can be  experienced at such depth.

d. platinum would have the greatest temperature increase because it has the lowest specific heat.

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach