Answer:
The velocity is 
Explanation:
From the question we are told that
The diameter of the pipe is 
The magnetic field is 
The hall voltage is 
Generally the average fluid velocity is mathematically represented as

=> 
=> 
Answer:
false. it's positive terminal of an electric cell
<span>A rocket in its simplest form is a chamber enclosing a gas under pressure. A small opening at one end of the chamber allows the gas to escape, and in doing so provides a thrust that propels the rocket in the opposite direction. A good example of this is a balloon. Air inside a balloon is compressed by the balloon's rubber walls. The air pushes back so that the inward and outward pressing forces are balanced. When the nozzle is released, air escapes through it and the balloon is propelled in the opposite direction.</span>
Answer:

Explanation:
Given:
height above the horizontal form where the ball is hit, 
angle of projectile above the horizontal, 
initial speed of the projectile, 
<u>Firstly we find the </u><u>vertical component of the initial velocity</u><u>:</u>



During the course of ascend in height of the ball when it reaches the maximum height then its vertical component of the velocity becomes zero.
So final vertical velocity during the course of ascend:
Using eq. of motion:
(-ve sign means that the direction of velocity is opposite to the direction of acceleration)

(from the height where it is thrown)
<u>Now we find the time taken to ascend to this height:</u>



<u>Time taken to descent the total height:</u>
- we've total height,


- during the course of descend its initial vertical velocity is zero because it is at the top height, so



<u>Now the total time taken by the ball to hit the ground:</u>


