Calculate the time necessary for 2 liters of water, initially at 20°c and contained in a cylindrical pot of diameter dp=20cm, to boil on a stove that delivers 10kw/m^2.

time is 35.53 min

Explanation:

given data

mass of water m = 2 L = 2kg

temperature = 20°C

diameter dP = 20 cm

rad

delivers = 10 kW/m²

to find out

Calculate the time

solution

we know here energy required to boil water that is

Q = mcΔT   .........1

m is mass and ΔT is change in temperature and c is 4186 J/kg°C

so Q = 2 × 4186 × ( 100-20)

Q = 669760 J = 669.760 kJ

so power will be

power =

power =

power =  

power = 0.314159 kW

so

energy = power × time

669.760 = 0.314159 × time

time = 2131.9140 sec

time is 35.53 min

unlike the threaded fasteners which are used to clamp the machine members, power screws are used to transmit power. common applications of power screws are: screw jacks: to lift weight. lead screw of lathe: for axial movement of tool and its precise positioning.

1

explanation: