Understanding Specific Heat

What is the primary purpose of specific heat in thermodynamics?

• To calculate the energy required to change temperature

• To find the density of a material

• To measure the mass of a substance

• To determine the volume of a liquid

Which equation is commonly used to represent specific heat?

• E = mc^2

• F = ma

• Q = mcΔT

• P = IV

If a material has a specific heat of 50 J/kg°C, how much energy is needed to raise the temperature of 1 kg by 2°C?

• 200 Joules

• 25 Joules

• 50 Joules

• 100 Joules

How does the mass of a material affect the energy required to change its temperature?

• Mass does not affect energy requirement

• More mass requires more energy

• More mass requires less energy

• Energy requirement is inversely proportional to mass

What is the specific heat of a material if 40,500 J of energy raises the temperature of 30 kg of iron by 3 K?

• 300 J/kg K

• 600 J/kg K

• 150 J/kg K

• 450 J/kg K

What happens to the temperature of water if 200,000 J of energy is removed from 4 kg of it?

• It remains the same

• It decreases by 11.9°C

• It decreases by 20°C

• It increases by 11.9°C

How much energy is needed to heat 10 kg of water by 8°C, given its specific heat?

• 200,000 Joules

• 334,880 Joules

• 100,000 Joules

• 500,000 Joules

What is the mass of water that would increase by 30°C if 10,000 J of energy is added?

• 2 kg

• 1 kg

• 0.5 kg

• 0.08 kg

Why can't the specific heat equation be used when a material changes state?

• Because the temperature remains constant

• Because the mass changes

• Because the energy is used for phase change

• Because the volume changes

What is the significance of the specific heat value in practical applications?

• It is used to measure atmospheric pressure

• It aids in designing heating and cooling systems

• It determines the boiling point of liquids

• It helps in calculating the speed of sound