DP Physics (last assessment 2024)
Question 21M.2.SL.TZ1.c
| Date | May 2021 | Marks available | [Maximum mark: 3] | Reference code | 21M.2.SL.TZ1.c |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Determine | Question number | c | Adapted from | N/A |
c.
[Maximum mark: 3]
21M.2.SL.TZ1.c
A mass of 1.0 kg of water is brought to its boiling point of 100 °C using an electric heater of power 1.6 kW.
The heater is removed and a mass of 0.30 kg of pasta at −10 °C is added to the boiling water.
Determine the equilibrium temperature of the pasta and water after the pasta is added. Other heat transfers are negligible.
Specific heat capacity of pasta = 1.8 kJ kg−1 K−1
Specific heat capacity of water = 4.2 kJ kg−1 K−1
[3]
Markscheme
use of mcΔT ✓
0.86 × 4200 × (100 – T) = 0.3 × 1800 × (T +10) ✓
Teq = 85.69«°C» ≅ 86«°C» ✓
Accept Teq in Kelvin (359 K).
