Question

Assuming that the barbell is in the starting position of the exercise done by the weightlifter. At what depth in fresh water the pressure on a diver is one atmosphere? [Density of water=${{10}^{3}}kg{{m}^{-1}}$, Normal pressure =${{10}^{5}}Pa$ .$g=10m{{s}^{-2}}$ ].
A) 11m
B) 10.5m
C) 10m
D) 9.8m

Answer 1

Hint: Pressure is the amount of force applied normal to the surface area of an object.it is also stated as the force applied per unit area which is perpendicular to the surface. Pressure is designed with the letter P and can also be used on some occasions. PS is the unit of pressure or stress based on avoirdupois units. A pound per square inch which clears that pressure is relative to a vacuum rather than the ambient atmospheric pressure.

Complete step-by-step solution:
Real depth is defined as the actual distance of an object which is placed beneath the surface of the water and apparent depth is defined as the depth of an object which is in a denser medium as seen from the rarer medium.
Real depth is more than the apparent depth and the apparent depth is always lesser than the real depth. When the real depth increases then the apparent depth also increases. Real depth is measured by submerging a perfect ruler along with it.
${{P}_{g}}=Ab\cdot Pressure-{{P}_{atm}}$
$\rho gh=P$
$P=\dfrac{F}{A}$
$\dfrac{\rho gh}{A}=P=\rho gh$
${{10}^{3}}\times 10\times h={{10}^{1}}$
$h=10m$
So the correct option is C.

Note:The atmosphere ( ) is another unit of pressure widely used.1atm of pressure is considered the normal ambient pressure which is equivalent to which is. Pounds square inch(psi)is often also specified at atmosphere pressure. Blaise Pascal was also an early pioneer of “The game theory”.