# Please solve q 69?

##### 2 Answers

#### Answer:

The answer is

#### Explanation:

The speed of water in the pipe is

The diameter of the pipe is

The volumetric rate flow is

The power is

where,

Therefore,

The answer is

#### Answer:

(c)

#### Explanation:

Alternate method.

Let

Quantity

#Q=Av# .....(1)

We know that power

#"Work done"=1/2mv^2# ........(2)

Since

#"Work done per unit time"propQv^2#

Inserting value of

#"Work done per unit time"prop(Av)v^2#

#=>Ppropv^3#