Physics
A fire truck uses 10,000 litres of water to extinguish a fire, cooling down the burning material from 500°C to 100°C. If the temperature of water increases by 40°C, how much heat energy is absorbed by it? (Specific heat capacity of water = 4200 J kg⁻¹ K⁻¹)
Calorimetry
89 Likes
Answer
Given,
Volume of water (V) = 10,000 L
Temperature increased (△t) = 40°C = 40 K
Specific heat capacity of water (c) = 4200 J kg⁻¹ K⁻¹
As,
Density of water (d) = 1 Kg/L
Let, Heat absorbed is Q.
From relation,
Substituting the values in the above formula,
Heat absorbed by water is 168 x 107 J.
Answered By
26 Likes
Related Questions
A car's cooling system uses water to absorb heat from the engine. If 5 kg of water absorbs 420 kJ of heat, what is the temperature increase of water? (Specific heat capacity of water = 4200 J kg⁻¹ K⁻¹)
Find the time taken by a 500 W heater to raise the temperature of 50 kg of material of specific heat capacity 960 J kg-1 K-1, from 18°C to 38°C. Assume that all the heat energy supplied by heater is given to the material.
An electric heater of power 600 W raises the temperature of 4.0 kg of a liquid from 10.0° C to 15.0° C in 100 s. Calculate — (i) the heat capacity of 4.0 kg of liquid, and (ii) the specific heat capacity of liquid.
0.5 kg of lemon squash at 30°C is placed in a refrigerator which can remove heat at an average rate of 30 J s-1. How long will it take to cool the lemon squash to 5°C ? Specific heat capacity of squash = 4200 J kg-1 K-1.