It is proposed to have a water heater that consists of an insulated pipe of 5-cm diameter and an electric resistor inside. cold water at 20°c enters the heating section steadily at a rate of 30 l/min. if water is to be heated to 55°c, determine (a) the power rating of the resistance heater (b) the average velocity of the water in the pipe.

a)

b)

Explanation:

Given:

∵1L of water = 1 kg by mass

∴

(a)

we have,

Specific heat capacity of water,

The amount of heat to be supplied per min to the water:

∴Power required is 73.225 kW.

(b)

∵Volume flow rate,

Now area of pipe:

∴Flow velocity

the focus of lesson 1 is newton's first law of motion - sometimes referred to as the law of inertia. newton's first law of motion is often stated as. an object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

explanation:

the answer is a. the yacht traveled from the dock north to the 200-meter marker in the bay in less than 5 minutes, giving the passengers several more hours to fish.

im doing peak rn so sry if its wrong