A rectangular block with side 5cm*10cm*20cm is made of materials of 32.5g per centimeter cube, find the maximum pressure that exert when resting with one of the face on a horizontal surface

P = 63765 [Pa]

Explanation:

In order to solve this problem we must use the definition of density which tells us that density is equal to the mass divided on the volume.

Now we must find the volume

Now we must use the density given:

Now we can calculate the mass:

m = d * V

m = 32500 * 0.001

m = 32.5 [kg]

We know that pressure is given by the following equation:

P = F/A

where:

F = Force or weigth [N] or = m*g

where:

g =  gravity = 9.81[m/s^2]

A = area [m^2]

The pressure will be maximum when the area is minimum. So the mimimun area is given by 5[cm] multiply by 10 [cm]

A = 5*10 =50[cm^2] = 0.005 [m^2]

F = 32.5 * 9.81 = 319[N]

P = 319/0.005

P = 63765 [Pa]

d

explanation:

v=uf/(u-f)

= 5.10/(5-10) convex lens has positive focal length

=50/-5

=-10 cm (formed at other side)

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray