- AZeroth law gives the concept of temperature.
- BTemperature measures the 'hotness' of the body.
- CHeat flows from higher temperature to lower temperature until thermal equilibrium is attained.
- DAll of the above.

Heat flows from body A to body B because temperature of body A is higher. At thermal equilibrium, $\text{T}_\text{A}'=\text{T}_\text{B}'$
| A in equilibrium with C | A in equilibrium with B |
| B in equilibrium with C |
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[$A$] The resistive force experienced by the plate is proportional to $\mathrm{v}$
[$B$] The pressure difference between the leading and trailing faces of the plate is proportional to uv
[$C$] The plate will continue to move with constant non-zero acceleration, at all times
[$D$] At a later time the external force $F$ balances the resistive force.
$(A)$ the mean free path of the molecules decreases.
$(B)$ the mean collision time between the molecules decreases.
$(C)$ the mean free path remains unchanged.
$(D)$ the mean collision time remains unchanged.
