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Consider a cylindrical tank of radius 1m is filled with water. The top surface of water is at 15 m from the bottom of the cylinder. There is a hole on the wall of cylinder at a height of 5m from the bottom. A force of  5 × 105 N is applied an the top surface of water using a piston. The speed of efflux from the hole will be: (Assume that there is no atmosphere above the piston)

Question

Consider a cylindrical tank of radius 1m is filled with water. The top surface of water is at 15 m from the bottom of the cylinder. There is a hole on the wall of cylinder at a height of 5m from the bottom. A force of  5 × 105 N is applied an the top surface of water using a piston. The speed of efflux from the hole will be: (Assume that there is no atmosphere above the piston)

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Solution

To solve this problem, we can use Torricelli's theorem, which states that the speed of efflux (v) is given by the square root of 2gh, where g is the acceleration due to gravity and h is the height of the water above the hole. However, in this case, there is an additional force applied on the top surface of the water, which increases the pressure at the hole.

First, we need to calculate the additional pressure (P) at the hole due to the force applied. The pressure is given by the force divided by the area over which it is applied. The area (A) of the top surface of the water is πr², where r is the radius of the cylinder. So, A = π(1m)² = 3.14 m².

Therefore, P = F/A = 5 × 10⁵ N / 3.14 m² = 1.59 × 10⁵ Pa.

This additional pressure will increase the speed of efflux from the hole. The pressure at the hole due to the height of the water is given by ρgh, where ρ is the density of water. So, the total pressure at the hole is P + ρgh.

The speed of efflux is then given by the square root of (2(P + ρgh)/ρ). Substituting the values for P, ρ, g, and h, we get:

v = sqrt[2(1.59 × 10⁵ Pa + 1000 kg/m³ * 9.8 m/s² * 5m) / 1000 kg/m³]

After calculating the above expression, we will get the speed of efflux from the hole.

This problem has been solved

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