Now consider a string with one free end. A free end is always at a peak or valley, since that is the only way forces can balance at the end of the string without something holding the other side. Draw the longest resonant wavelength that will fit properly on this string.

The image mentioned is in the attachment

a) P = 2450 Pa;

b) P = 2940 Pa;

c) F = 4.9 N

Explanation:

a) Pressure is a force applied to a surface of an object or fluid per unit area.

The image shows a block applying pressure on the large side of the piston. The force applied is due to gravitation, so:

P =

P =

P =

P = 2450 Pa

The pressure generated by the block is P = 2450 Pa.

b) A static liquid can also exert pressure and can be calculated as:

ρ.g.h

where

ρ is the density of the fluid

h is the depth of the fluid

g is acceleration of gravity

600.9.8.0.5

2940 Pa

The pressure in the fluid at 50 cm deep is 2940 Pa.

c) For the system to be in equilibrium both pressures, pressure on the left side and pressure on the right side, have to be the same:

=

F =

Adjusting the units, = 0.002 m².

F =

F = 4.9 N

The force necessary to be equilibrium is F = 4.9 N.