Specific Heat & Temperature Changes Practice Problems
Thermal regulation of a room involves heating and cooling. If a newly constructed room in a house has a volume of 15400 L and a temperature of 5.0°C, what quantity of heat is required to raise the temperature of the room to the WHO recommended room temperature of 18°C? Take the specific heat capacity of air to be 1020 J/kg•K and the mass of 1.0L of air to be 1.3 × 10-3 kg.
Some individuals consider it faster and time-saving to boil water in an electric kettle before transferring it into cookware for subsequent use. If a 2200 W electric kettle is used to heat 1.80 kg of water from 25°C to 90°C, determine the period required to boil the water. Assume water absorbs 100% of the heater's power.
According to the conservation of energy, energy is not destroyed or created but can be converted to other forms of energy. Suppose 75% of the supplied kinetic energy by a 2.50 kg hammer at a speed of 10.2 m/s when hammering a block is converted into heat energy of the block. Determine the gain in temperature of a 500 g iron block when hammered 8 times.
A 2.0 kg iron ball is released from a 48.0 m tall building. The ball remains intact upon hitting the ground. If all the ball's mechanical energy is converted into heat energy of the ball, determine the rise in temperature of the ball.