Answer:
They investigated Hooke's law.
Explanation:
The correct answer would be B. It is the compound Na2S that forms an ionic bond from the given ion above. From the choices, it is the only compound that exist and is available. Metals cannot react with another metal as well as nonmetal to nonmetal.
It is most accurate to say that body mass index (BMI) provides information about an individual's height-weight ratio. The correct answer is B.
Answer: 
μc
have: 2μF = 
F
the charge on this capacitor is 
(μc)
Explanation:
We can do dimensional analysis in this particular problem. We do as follows:
PEs = 1/2 kx^2
kg . m^2 /s2 [=] k (m)²
The units in the left side should be the same units as the resulting units in the right side.
kg . m^2 /s2 [=] (kg/s²) (m)²
Therefore, the units of k should be kg/s².
