Which of the following statements is false? Dissolving salt into water is an example of a mixture.
Dissolving salt into water is an example of a mixture.

The mass of one piece of paper is the same even after it is ripped in half and the 2 pieces are measured again.
The mass of one piece of paper is the same even after it is ripped in half and the 2 pieces are measured again.

Increasing the temperature of water to a boil is a physical change.
Increasing the temperature of water to a boil is a physical change.

The formation of a precipitate is the only way to see if a chemical change has occurred.

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

b. false

explanation:

suppose a rock in free fall is dropped off a cliff. after falling for 5 seconds, its speed would not be 100 m/s.