Open main menu

Changes

Thermal Energy Store

666 bytes added, 18:54, 30 January 2019
Calculating Thermal Energy
|-
| style="height:20px; width:200px; text-align:center;" |A 2 kg [[object]] made from a [[material]] with [[Specific Heat Capacity|specific heat capacity]] 5 J/kg/°C is heated by 10°C. Calculate the '''Thermal Energy''' transferred to the [[object]].
| style="height:20px; width:200px; text-align:center;" |QA sealed metal can containing 5.5 kg of [[water]] is heated over a fire from 27°C to 100°C to sterilise the [[water]]. Calculate the increase in '''thermal energy''' of the [[water]]. The [[Specific Heat Capacity]] of [[water]] is 4200 J/kg/°C.
| style="height:20px; width:200px; text-align:center;" |Q
|-
Δθ = 10°C
| style="height:20px; width:200px; text-align:left;" |'''State the known quantities''' m = 2 kg c = 5 J/kg/°C θ<sub>1</sub> = 27°C θ<sub>2</sub> = 100°C '''Find the [[temperature]] change.''' Δθ = θ<sub>2</sub> - θ<sub>1</sub> = 100 - 27 = 73°C
| style="height:20px; width:200px; text-align:left;" |Step n
<math>E_t = 100J</math>
| style="height:20px; width:200px; text-align:left;" |Step n'''[[Substitute (Maths)|Substitute]] the numbers into the [[equation]].''' <math>E_t = m c \Delta \theta</math> <math>E_t = 5.5 /times 4200 /times 73</math> <math>E_t = 1686300</math> <math>E_t &asymp 1700000</math>
| style="height:20px; width:200px; text-align:left;" |Step n
|}