How do collisions between molecules transfer energy from a system of reacting substances to its surroundings?
A. They cause molecules to flow into the system from the
surroundings.
B. They cause heat to flow from the system to the surroundings.
C. They cause the thermal energy of the surroundings to decrease.
D. They cause the potential energy of the system to increase.

false

explanation:

boats, things on boats luggage are way more heavy then water.

50 inches should be the resultant vector

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia