Question

physics honors
chapter 11.2 – heat transfer a
name: miranda e
period: 6
score:

1. define heat

1. define specific heat

1. write the equation for heat transfer and define all the variables.

1. what is the si unit for heat transfer?

1. in the equation for heat transfer, temperature must have what units? use complete sentences to receive full credit.

1. complete the table below by writing the correct specific heat. see table 11.2 on page 333 for help.

substances | specific heat (c)
aluminum | 900
iron |
gold | 129
glass | 840
human body |
mercury | 139
silver | 88.3
water | 4186

Explanation:

1. Heat is defined as thermal energy transferred between objects due to a temperature difference.
2. Specific heat is the amount of heat required to raise the temperature of 1 kilogram of a substance by 1 Kelvin (or Celsius).
3. The standard heat transfer equation relates heat, mass, specific heat, and temperature change, with each variable representing a key property in the transfer.
4. The SI unit for heat (a form of energy transfer) is the joule.
5. In the heat transfer equation, temperature values must be in Kelvin (or Celsius, since the change is equivalent) to ensure consistent, unit-correct calculations.
6. Specific heat values are taken from standard physics reference tables for common substances.

Answer:

1. Heat is the transfer of thermal energy between systems or objects due to a temperature difference.
2. Specific heat is the amount of thermal energy required to raise the temperature of 1 kilogram of a substance by 1 Kelvin (or 1 degree Celsius).
3. Heat transfer equation: $Q = mc\Delta T$

• $Q$: Heat energy transferred (in joules, J)
• $m$: Mass of the substance (in kilograms, kg)
• $c$: Specific heat capacity of the substance (in J/(kg·K) or J/(kg·°C))
• $\Delta T$: Change in temperature ($\Delta T = T_{final} - T_{initial}$, in Kelvin K or degrees Celsius °C)

1. The SI unit for heat transfer is the joule (J).
2. In the heat transfer equation, temperature must be measured in Kelvin (K) or degrees Celsius (°C). The unit choice does not affect the calculation because we use the change in temperature, and a 1-degree change in Celsius is equal to a 1-degree change in Kelvin.

6.

Substances	Specific Heat (c) (J/(kg·K))
Iron	450
Gold	129
Glass	840
Human Body	3500
Mercury	139
Silver	88.3
Water	4186