What happens to the temp of the liquid in a cup if water as some of the water evaporates

The correct answer is cooling effect is observed.

Explanation:

With the evaporation of some of the water, it can be said that the molecules of water have captivated heat from the environment and the liquid state of water get convert into the vapor state. Thus, a cooling effect is witnessed because the heat of the surrounding molecules has got diminished due to the absorption of the molecules of water. Therefore, there will be a reduction in the temperature and a cooling effect is witnessed.

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied