1. Energy Calculations
∆Q = m x c x ∆θ

2. Winter surfing at the same latitude !
Newquay
New York

3. Gulf Stream

4. Water has a high specific heat capacity.
It takes a lot of heat (thermal) energy to heat up water and raise its temperature.
Water can hold a lot of heat.
Specific heat capacity is the amount of heat which raises the temperature of 1 kg of material by 10C.
1 kg of material
Specific Heat Capacity (J/kg/0C)
Copper
3800
Iron
4500
Granite
7000
Air
1010
Water

5. Energy Calculations
∆Q = m x c x ∆θ

6. ∆ Q
m x c x ∆θ

7. Calculating the specific heat capacity of water.
c = ∆Q / m x ∆θ

8. Investigating c of water
c = ∆Q / m x ∆θ

9. ∆Q = m x c x ∆θ L5 Example Question 1
The specific heat capacity of water is 4182 J/kg 0C. Calculate the energy needed to heat 2kg of water from 10 to 600C.
∆Q = m x c x ∆θ

10. A brick fireplace

11. ∆Q = m x c x ∆θ L5 Example Question 2
A brick has a specific heat capacity of 840 J/kg 0C. Calculate how much energy is needed to heat 320 kg of brick fireplace from 15 to 300C.
∆Q = m x c x ∆θ

12. Aluminium Pans

13. ∆Q = m x c x ∆θ L5 Example Question 3
An Al pan has a specific heat capacity of 878 J/kg 0C. Calculate how much energy needed to heat a pan of 0.68 kg from 20 to 1600C.
∆Q = m x c x ∆θ

14. ∆Q = m x c x ∆θ L6+ Example Question 4
J is transferred into a 0.5 kg block of metal. Its temperature is raised by 500C. What is the specific heat capacity of the metal and can you identify the metal ?
∆Q = m x c x ∆θ

15. L6+ Example Question 5
Brick has a specific heat capacity of 840 J/kg0C. Calculate how much energy the 800 kg heater in the picture stores when the bricks are 400C above the air temperature in the room ?
Calculate the temperature change when J of energy is transferred to 1 kg of brick ?