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Q. Iron has a density of 7.87 g/cm3 and the mass of an iron atom is 2.40 x 10-26 Kg. If the atoms are spherical and tightly packed, what is the volume of an iron atom?

Q. From the top of a cliff, a person uses a slingshot to fire a pebble straight downward, which is the negative direction. The initial speed of the pebble is 9.4 m/s. (a) What is the acceleration (magnitude and direction) of the pebble during the downward motion?

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Category:- Physics
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