Heat & Thermodynamics
Answers
Unit 42: Specific Heat Capacity & Phase Changes
Q42.1) 1.67 x 10⁵ J
Q42.2) 6.7 x 10⁵ J
Q42.3) 4.52 x 10⁶ J
Q42.4) 3.1 x 10⁷ J
Q42.5) 0.57 kg
Q42.6) 9.56 hours
Unit 43: Heat Exchange
Q43.1) 31°C
Q43.2) 4.38 kg
Q43.3) Approximately 200 000 slaps
Unit 44: Heat Conduction
Q44.1) 8.36 x 10⁷ J
Q44.2) 4.5
Q44.3) a) -7.7°C
b) 461 W
Q45.1) a) 2839 W/m²
b) 364 W/m²
c) 31 100 W
Q45.2) a) 502 nm
b) 9.56 μm
c) 2.28 μm
Q45.3) 1.35 m²
Q45.4) 1/3 or 0.33, which means it’s biologically advantageous to be larger in cold conditions.
Unit 45: Thermal Radiation
Unit 46: Newton’s Law of Cooling
Q46.1) 19°C
Q46.2) 0.074 s⁻¹
Q46.3) 55 minutes