Answer: option 1. thermal expansion and contraction.
The thermostat uses the thermal expansion and contraction of metals: when the metal expands it acts as a switch, a coiled ribbon expands and the electric circuit is off, then the current stops. When the temperatures decrease, the coiled ribbon contracts and the circuit is on, then the current starts to flow and the resistance starts to radiate heat.
The best and most correct answer among the choices provided by your question is the third choice or letter C.
<span>The statement "Your hypothesis must be testable." is true about the scientific process.
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The balanced chemical reaction is expressed as:
<span>2Al(s)+3FeO(s)->3Fe(s)+Al2O3(2)
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We are given the amount of FeO to be used in the reaction. This amount will be the starting point for our calculations. It is as follows:
1.2 mol FeO ( 2 mol Al / 3 mol FeO) = 0.8 mol Al needed to react completely
Answer:
x22.=L1cosθ1θ1. + L2cosθ2θ2.
y22.=-L1sinθ1.θ1. + L2sinθ2.θ2.
θ1.=θ1.+θ1..dt
Explanation:
the step-by-step solution is in the image