Question

A ball is moving without spinning in a straight line through a fluid
If pA and pB are pressure values at A and B, then find their ratio.​

Answer 1

Explanation:

A and B, it is the answer

Answer 2

Answer:

The ratio between the pressure values of A and B is 1.

Explanation:

Given that a ball is moving in a straight line through a fluid without spinning.

• If a body is in motion in fluid, the resultant force experienced by a body in a fluid is called dynamic lift.
• The dynamic lift cause the deviation in the parabolic trajectory of the body.
• The path of a body in a fluid can be traced by drawing imaginary lines called streamline.
• The tangents drawn to these lines represent the velocity vector field in a fluid.
• When the ball moving without spin,  the streamlines around the ball will be symmetrical.
• The fluid exerts no upward or downward force on the ball.
• This shows the velocity of fluid above and below the ball is same.
• Hence, there will not be any pressure difference above and below the ball.

Therefore, $P_A = P_B$ and hence $\dfrac{ P_A}{ P_B} =1$.

So, the ratio between the pressure values of A and B is 1.