Choose all of the following that represent scalars.
a
mass
b
time
c
position
d
velocity
e
acceleration
f
volume
Scalars are quantities that are described by a magnitude (size or amount) alone and do not include direction. Based on this definition, the scalars from your list are:
a) Mass - It has only magnitude (e.g., 5 kilograms) and no direction.
b) Time - It is measured only in magnitude (e.g., 10 seconds) and has no direction.
f) Volume - It is a measure of the amount of space occupied, having only magnitude (e.g., 2 liters) and no direction.
The following are not scalars since they involve both magnitude and direction:
c) Position - While often colloquially referred to in scalar terms (like "5 meters away"), in physics, it is a vector because it requires both magnitude and direction to fully describe it (e.g., 5 meters to the north).
d) Velocity - It specifies the rate of change of position with respect to time and direction (e.g., 10 meters per second to the east).
e) Acceleration - It is the rate of change of velocity over time, with both magnitude and direction (e.g., 2 meters per second squared downward).