Thermal Energy and Specific Heat

This video tutorial covers the concept of specific heat capacity, explaining the formula E = mcΔθ and its components. It includes several example problems that demonstrate how to calculate thermal energy, temperature change, specific heat capacity, and mass. An extension problem is also provided, involving the calculation of current using energy transfer and voltage.

What does the symbol 'c' represent in the equation E = mcΔT?

• Energy

• Mass

• Specific heat capacity

• Change in temperature

In the equation E = mcΔT, what is the unit of energy?

• Degrees Celsius

• Joules

• Kilograms

• Watts

If a block of metal has a mass of 1.04 kg and a specific heat capacity of 5530 J/kg°C, what is the increase in thermal energy when the temperature rises by 39.9°C?

• 229,473 J

• 100,000 J

• 150,000 J

• 300,000 J

How do you rearrange the equation E = mcΔT to solve for the temperature change (ΔT)?

• ΔT = E * mc

• ΔT = E / (m + c)

• ΔT = E / (mc)

• ΔT = mc / E

A block of metal has a mass of 3.68 kg and a specific heat capacity of 2650 J/kg°C. If the thermal energy increases by 954 kJ, what is the temperature change?

• 120°C

• 75°C

• 98°C

• 50°C

What is the specific heat capacity of a block of metal if its mass is 1.4 kg, the temperature change is 62.1°C, and the energy increase is 0.479 MJ?

• 4500 J/kg°C

• 5000 J/kg°C

• 5510 J/kg°C

• 6000 J/kg°C

How do you convert energy from megajoules to joules?

• Multiply by 1,000,000

• Divide by 1000

• Multiply by 100

• Divide by 1,000,000

If a block of metal has a specific heat capacity of 4.58 kJ/kg°C and the temperature increases by 142°C with an energy increase of 2760 kJ, what is the mass of the block?

• 3.5 kg

• 6.0 kg

• 4.2 kg

• 5.0 kg

What is the specific heat capacity of water in kJ/kg°C?

• 3.5 kJ/kg°C

• 2.5 kJ/kg°C

• 4.2 kJ/kg°C

• 5.0 kJ/kg°C

If 1.2 kg of water is heated from 20°C to 100°C in 3 minutes using a kettle, what is the current if the mains voltage is 230 V?

• 8.5 A

• 9.7 A

• 10.5 A

• 11.2 A