Answer:
Option A
Explanation:
At segment T-U, the substance changes from a liquid to a gas and does not change temperature.
The reason is because latent heat of vaporisation allows for the absorption of heat in the change of state and temperature remains constant until it has fully changed state.
A
More concentrated means more collisions per unit volume, and as the volume stays the same and only concentration changes, the there are more collisions
The effective acceleration or deceleration due to gravity depends on the inclined angle of the track relative to ground; the steeper the slope is the greater the effective acceleration.
The common formula for work is:
Work = force x displacement
W = F x d