Question

which of the following units can be used to measure heat? choose all that apply.
cal
kg m²/s²
k
j/s
j
m/s²
°c
kg m/s²
kw
°f

Explanation:

• cal: Calorie (cal) is a unit of heat (energy), specifically the amount of heat needed to raise 1 gram of water by 1°C.
• kg m²/s²: This is the unit of joule (J), and heat is a form of energy, so joule (and its equivalent unit \( \text{kg m}^2/\text{s}^2 \)) measures heat.
• J: Joule (J) is the SI unit of energy, and heat is energy, so joule measures heat.
• K, °C, °F: These are units of temperature (a measure of thermal energy intensity, not heat itself). Heat is energy transfer, temperature is a state variable.
• J/s: This is watt (W), a unit of power (energy per unit time), not heat.
• m/s²: Unit of acceleration, not related to heat.
• kg m/s²: Unit of force (newton), not heat.
• kW: Kilowatt, a unit of power, not heat.

Answer:

• cal
• \( \text{kg m}^2/\text{s}^2 \)
• J