Who has chegg? Please someone help me this is important

And

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The density of a substance is 4.0 g/cm3. if a sample of the substance has a volume of 25 cm3 then what is the mass

Use the right-hand rule for magnetic force to determine the charge on the moving particle. this is a charge.

The charge on a charged sphere is: a)concentrated at its centerb)distributed uniformly throughout its volumec)clustered on its centerd)distributed uniformly over its surface