Carla makes a small cardboard boat and floats it in a tub of water. when she adds a drop of dish soap behind the boat, the boat moves forward.

which statement best explains what happened?
a. the soap increased the viscosity of the water behind the boat, allowing the water in front of the boat to flow more easily.
b. the soap reduced the surface tension behind the boat, causing both water molecules and the boat to be pulled forward.
c. the soap increased the kinetic energy of the water molecules behind the boat, causing both the molecules and the boat to move forward.
d. the soap formed an immiscible layer on the water, causing the soap to spread out and push the boat forward.

The correct answer is option(B).

Explanation

Surface tension is defined as force experienced by the molecules of the surface due to the presence of unbalanced force acting downwards which makes the liquid to occupy minimum surface area.

When Carla added a drop of dish soap behind the boat the surface tension of the water got reduced due to which force between the water molecules present on the surface of the water got weakened. This reducing action of soap on the surface tension of the water caused the boat and water molecules to move forward.

So, the correct option is (B).

dynamic equilibrium is the answer.

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.