Under steady state, the temperature of a body

Q. If the velocity of a body does not change with time, its acceleration is ___.

Q. The torque $\overrightarrow{\tau }$ on a body about a given point is found to be $\overrightarrow{A}\times \overrightarrow{L}$ where $\overrightarrow{A}$ is a constant vector and $\overrightarrow{L}$ is angular momentum of the body about that point. From this it follows that

Q. When the position of a body with respect to its surroundings does not change with time, it is said to be .

Q. A body is said to be at rest if it does not change its position continuously with respect to its surroundings with the passage of time.

Q. The torque $\tau$ on a body about a given point is found to be equal to $\overrightarrow{A}\times \overrightarrow{L}$, where $\overrightarrow{A}$ is a constant vector and $\overrightarrow{L}$ is the angular momentum of the body about the point. From this, it follows that $\tau =\frac{d\overrightarrow{L}}{dt}$ (where $L$ is the angular momentum and $t$ is time).
a) $\overrightarrow{A}$ is perpendicular to $\overrightarrow{L}$ at all instants of time.
b) The component of $\overrightarrow{L}$ in the direction of $\overrightarrow{A}$ does not change with time.
c) The magnitude of $\overrightarrow{L}$ does not change with time.
d) $\overrightarrow{L}$ does not change with time.