What allows the bimetallic coil to turn on or off a heating or cooling system? The two metals contract the same amount. The thermostat is set at a particular temperature. The two metals expand differently. The coil comes in contact with air.

The two metals expand differently.

Explanation:

The bimetallic strip has two metal strips positioned like a bridge, these strips connect the electrical circuit to the heating system. When these strips are linear or "down" they allow the electricity to move through the circuit to the heating system to turn the heat on. When the strips are "up" the disconnect the electricity flow, thus turning the heating system off, thus the room becomes cool/cold.

some think that theories become laws, but theories and laws have separate and distinct roles in the scientific method. a law is a description of an observed phenomenon in the natural world that hold true every time it is tested. it doesn't explain why something is true; it just states that it is true.

answer: a) y=-8x+5

a) m= -8

b) m= -2

c) m= 7

d) m= 6