edandjill24
06.11.2020 •
Physics
IF YOU HELD TWO PENNIES IN YOUR HAND, ONE DATED 1979 AND ONE DATED 1984, WHICH WOULD BE HEAVIER?
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Ответ:
It might be the older copper. idk for sure though.
Explanation:
Ответ:
the older coin The coin was larger and made of pure copper, while today's penny is made of copper and zinc. In 1982, Congress told the Mint to make the cent smaller and to mix the copper with nickel. so it would be 1979
Explanation:
Ответ:
a = 0.55 m / s²
Explanation:
The centripetal acceleration is given by the relation
a = v² / r
angular and linear velocities are related
v = w r
we substitute
a = w² r
In the exercise they indicate the angular velocity w = 1 rev/min, let's reduce to the SI system
w = 1 rev / min (2pi rad / 1rev) (1min / 60s) = 0.105 rad/ s
let's calculate
a = 0.105² 50.0
a = 0.55 m / s²