The density for manganese is 7.47 g/cm3. What would be the mass of a 45 cm3 piece of manganese? A. 336.15g
B. 6.02g
C. 672.3g
D. 333g

A. 336.15g

Explanation:

Sana makatulong

r=rho l/a where a is the area, l is the length and rho is resistivity so the greater the area the lesser the resistance thats why the earth pin is thicker bcos current follow the shortest path, so less resistive .

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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