Question

(ii) The hardness of 1000 liters of a sample was removed by
passing it through a Zeolite softener. The softener then required
30 liters of sodium chloride solution containing 15 g/L of NaCl
for regeneration Calculate the hardness of the sample of water.​

Answer 1

Answer:

The work needed to be done is 156187 J.

Given :

Initial velocity(u) = 30 km/h = 30 × 5/18 = 25/3 m/s.

Final velocity(v) = 60 km/h = 60 × 5/18 = 50/3 m/s

Mass = 1500 kg

To Find :

Work needed to be done = ?

Solution :

We know the formula to calculate the work done,

So by using it,

➠ Work done = 1/2mv² - 1/2mu²

➠ W = m/2(v²-u²)

➠ W = 1500/2(50/3²-25/3²)

➠ W = 156187 J

━━━━━━━━━━━━━━━

➤ Additional information :

Work is done when a force that is applied to an object moves that object or body!!

The work is calculated by multiplying the force by the amount of movement of an object itself !!

Formula = f × d

━━━━━━━━━━━━━━━