3. A 0.98 kg rock is attached to a 0.40-m rope and spun in a vertical
circle. The tension on the rope when the rock is at the top of the
swing is 79.0 N [down]. What is the speed of the rock?
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Ответ:
v = 6.0 m/s
Explanation:
T = m(v²/R - g)
(T/m + g)R = v²
v = √((79.0/0.98 + 9.81)0.40) = 6.0140... ≈ 6.0 m/s
Ответ:
a fnt is a diferent kind of writing
Explanation: