Physics
A large bucket of water at 40 °C and a small cup of water at 80 °C are kept on a table. Which of them has higher heat content ?
- The cup of water.
- The bucket of water.
- Both of them have an equal heat content.
- Cannot be said without knowing the mass of the water in each.
Answer
Cannot be said without knowing the mass of the water in each.
Reason — Heat content depends on the amount of heat energy, which is given by
Q = mcΔt
where
- m is mass,
- c is specific heat capacity, and
- Δt is the change in temperature.
Although the cup has a higher temperature, the bucket may contain a much larger mass of water. Since heat content depends on both mass and temperature, we cannot determine which has more heat without knowing the mass of water in each.
Related Questions
The curve which shows the rise of temperature with the amount of heat supplied for a piece of ice is :
- A
- B
- C
- D
Two bodies A and B are of the same material but A has twice the mass of B. Both are heated up to the same temperature. Identify the correct statement ?
- Heat absorbed by A is half of that by B.
- Heat absorbed by A is equal to that by B.
- Heat absorbed by A is twice of that by B.
- Heat absorbed by A is four times that by B.
Assertion (A): A desert becomes extremely hot in day time and very cold at night.
Reason (R): Sand has high specific heat capacity.
- both A and R are true and R is the correct explanation of A
- both A and R are true and R is not the correct explanation of A
- assertion is false but reason is true
- assertion is true but reason is false
Write down the approximate range of temperature at which water boils in a pressure cooker.