Energy, Heat Capacity and Latent heat

Question 1:

A kettle transfers 9 MJ of energy in 5 minutes to boil water. Calculate the power of the kettle.

Answer W

Question 2:

A microwave oven transfers 1.2 MJ of energy in 2 minutes. Calculate its power.

Answer W

Question 3:

A heater transfers 24 MJ of energy in 8 minutes. Calculate its power.

Answer W

Question 4:

A washing machine transfers 4.5 MJ of energy in 15 minutes. Calculate its power.

Answer W

Question 5:

An electric motor transfers 18 MJ of energy in 6 minutes. Calculate its power.

Answer W

Question 1:

A kettle heats water from 15°C to 85°C.
The energy output of the kettle is 3.36 kJ.
The specific heat capacity of water is 4200 J/kg°C.
Calculate the mass of water.

Answer kg

Question 2:

A tea maker heats water from 25°C to 95°C.
The energy output of the tea maker is 4.2 kJ.
The specific heat capacity of water is 4200 J/kg°C.
Calculate the mass of water.

Answer kg

Question 3:

A soup warmer heats water from 10°C to 80°C.
The energy output is 5.88 kJ.
The specific heat capacity of water is 4200 J/kg°C.
Find the mass of water.

Answer kg

Question 4:

A heating device raises the temperature of water from 30°C to 90°C.
The energy provided is 2.1 kJ.
The specific heat capacity of water is 4200 J/kg°C.
Calculate the mass of water.

Answer kg

Question 5:

A laboratory heater warms water from 5°C to 75°C.
The energy supplied is 6.3 kJ.
The specific heat capacity of water is 4200 J/kg°C.
Determine the mass of water.

Answer kg

Question 1

A sample of water at 0°C freezes completely, releasing 1.32 kJ of energy.
The specific latent heat of fusion of water is 330 kJ/kg.
Calculate the mass of ice produced.

Answer kg

Question 2

A block of ice at 0°C melts, absorbing 2.64 kJ of energy.
The specific latent heat of fusion of water is 330 kJ/kg.
Calculate the mass of ice that melted.

Answer kg

Question 3

A sample of water releases 0.99 kJ of energy as it freezes completely at 0°C.
The specific latent heat of fusion of water is 330 kJ/kg.
Calculate the mass of ice produced.

Answer kg

Question 4

A beaker contains water at 0°C. If 3.30 kJ of energy is removed, how much ice is formed?
The specific latent heat of fusion of water is 330 kJ/kg.

Answer kg

Question 5

A mass of ice melts completely at 0°C, absorbing 5.94 kJ of energy.
The specific latent heat of fusion of water is 330 kJ/kg.
Calculate the mass of ice that melted.

Answer kg

Question 1:

A kettle heats water from 25°C to 100°C.
The power output of the kettle is 3.0 kW.
The specific heat capacity of water is 4200 J/kg°C.
Calculate the mass of water that the kettle can heat in 10 seconds.

Answer kg

Question 2:

A heating system warms water from 15°C to 70°C.
The power output is 5 kW.
The specific heat capacity of water is 4200 J/kg°C.
Find the mass of water heated in 20 seconds.

Answer kg

Question 3:

An electric boiler heats water from 10°C to 80°C.
The power output is 4.5 kW.
The specific heat capacity of water is 4200 J/kg°C.
Calculate the mass of water heated in 12 seconds.

Answer kg

Question 4:

A coffee maker heats water from 18°C to 95°C.
The power output is 2.8 kW.
The specific heat capacity of water is 4200 J/kg°C.
Determine the mass of water that can be heated in 15 seconds.

Answer kg

Question 5:

A tea kettle heats water from 22°C to 92°C.
The power output is 3.5 kW.
The specific heat capacity of water is 4200 J/kg°C.
Find the mass of water heated in 8 seconds.

Answer kg