When water flows from a faucet, the water molecules tend to join together and form a stream. which of the four fundamental forces most likely accounts for this, and why?

The fundamental force responsible for the cohesion of the water molecules leaving the faucet is the electromagnetic force.
Electromagnetic forces act on particles that are electrically charged. Water molecules are polar, which means that they have a positively charged end and a negatively charged end. This polarity arises from the fact that oxygen pulls the electrons in the molecule towards itself and attains a negative charge, while the hydrogen atoms in the molecules are left with a positive charge.

Electromagnetic force is responsible for the inter-molecular interaction.  The fundamental force that join water molecules together when water flows from faucet is Electromagnetic force.

Fundamental Forces:

These are the parent force of any interaction in universe. There are four type of fundamental forces.

Strong Nuclear forcesElectromagnetic ForceWeak nuclear forceGravity

Electromagnetic Force:

This force work on charged molecules. In water molecule, difference between the electronegativity of Hydrogen and Oxygen is very high , which makes water molecule polar. These polar water molecules interact with each other by forming H- bond. This interaction between water molecules known as Cohesion.

Hence, the fundamental force that join water molecules together when water flows from faucet is Electromagnetic force.

To know more about fundamental forces, refer to the link:

link

The law of conservation of momentum will be the same no matter where you apply it.the equation will be  77.4 + m (mass of canister) *3.6

The correct answer is waves