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- A 1938-nickel has a diameter of 21.21 mm, a thickness of 1.95 mm, andweighs 0.04905 N. What is its density?Given that 10m of a string has a mass of 2.863g, what is the linear mass density?I need help with this problem and an explanation of why its the answer described below: ( 7330 m/s is the answer but I need an explanations as to why it's the answer.)