This physics problem tests your understanding of fundamental physical laws and their applications. The step-by-step solution below breaks down the problem using relevant equations and physical reasoning.
ScanSolve AI Answer
a) Two factors that should be considered when choosing fuel for cooking are: • Calorific value: The amount of heat produced per unit mass or volume of the fuel. • Cost and availability: The economic feasibility and ease of obtaining the fuel. b) i) Heat evolved during the experiment. Given data: Volume of water (V) = 450 cm^3 Initial temperature of water (T_i) = 25^ C Final temperature of water (T_f) = 46.5^ C Density of water () = 1 g/cm^3 Specific heat capacity of water (c) = 4.2 kJ/kg K (assuming the given 4.2 kg/kg K is a typo and should be 4.2 kJ/kg K) Step 1: Calculate the mass of water. The mass of water can be calculated using its density and volume. m = × V m = 1 g/cm^3 × 450 cm^3 m = 450 g Convert mass to kilograms: m = 450 g × 1 kg1000 g m = 0.450 kg Step 2: Calculate the change in temperature of the water. T = T_f - T_i T = 46.5^ C - 25^ C T = 21.5^ C Note that a change in temperature of 21.5^ C is equivalent to a change of 21.5 K. Step 3: Calculate the heat evolved (heat absorbed by the water). The heat absorbed by the water (Q) is calculated using the formula Q = mc T. Q = m × c × T Q = 0.450 kg × 4.2 kJ/kg K × 21.5 K Q = 39.825 kJ The heat evolved during the experiment is 39.825 kJ. Send me the next one 📸