Advertisements
Advertisements
Question
An electric heater of power 600 W raises the temperature of 4.0 kg of a liquid from 10.0℃ to 15.0℃ in100 s. Calculate:
- the heat capacity of 4.0 kg of liquid,
- the specific heat capacity of the liquid.
Advertisements
Solution
Power of heater P = 600 W
t = 100 S
Mass of liquid m = 4.0 kg
Change in temperature of liquid = (15 − 10)°C = 5°C (or 5 K)
Time taken to raise its temperature = 100 s
(i) Heat capacity of liquid C' = `"Q"/(Δ"T")`
∴ C' = `60000/5`
= 12000 JK-1 or 1.2 × 104 JK-1
(ii) Specific heat capacity of liquid C = ?
C = `"Q"/("m"Δ"T")`
= `60000/(4 xx 5)`
= 3 × 103 J Kg-1°C-1
APPEARS IN
RELATED QUESTIONS
Specific heat capacity of substance A is 3.8 J g-1K-1 whereas the specific heat capacity of substance B is 0.4 J g-1 K-1
(i) Which of the two is a good conductor of heat?
(ii) How is one led to the above conclusion?
(iii) If substances A and B are liquids then which one would be more useful in car radiators?
Why do the farmers fill their fields with water on a cold winter night?
A mass m1 of a substance of specific heat capacity c1 at temperature t1 is mixed with a mass m2 of other substance of specific heat capacity c2 at a lower temperature t2. Deduce the expression for the temperature t of the mixture. State the assumption made, if any.
The product of mass and specific heat is known as ..........
A burner raises the temperature of 360 g of water from 40°C to 100°C in 5 minutes. Calculate the rate of heat supplied by the burner.
Derive an expression for finding out the specific heat capacity of a body (solid) from the readings of an experiment given below:
(i) Mass of empty calorimeter (with stirrer) = m1 gm
(ii) Mass of the metal piece = M gm
(iii) Mass of colorimeter and water = m2 gm
(iv) Initial temperature and water = t1°C
(v) Temperature of hot solid (metal piece) = t2 °C
(vi) Final temperature of the mixture = t°C
(vii) Specific heat of calorimeter = 0.4 J gm / °C
Decide the unit for specific heat capacity.
Two metals A and B have specific heat capacities in the ratio 2:3. If they are supplied same amount of heat then
Which metal piece will have greater mass if the rise in temperature is the same for both metals?
Give one example where high specific heat capacity of water is used as heat reservoir.
