Define Newton's third law: A) states that forces=m Xa

B)states that all forces occur in pairs

C)states that forces keep moving until acted upon by unbalanced force

D)states that gravity affects all objects

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Glass has a hardness that is in the middle of the hardness scale. what is the hardness of glass?

The nuclear potential that binds protons and neutrons in the nucleus of an atom is often approximated by a square well. imagine a proton conned in an innite square well of length 105 nm, a typical nuclear diameter. calculate the wavelength and energy associated with the photon that is emitted when the proton undergoes a transition from the rst excited state (n 2) to the ground state (n 1). in what region of the electromagnetic spectrum does this wavelength belong?

Which property is expressed in distance units? o a. period o b. wavelength o c. speed o d. frequency