The wheel of a car has a radius of 0.413 m. If the wheel rotates at 456 revolutions per minute, what is the speed (in m/s) at wh
2 answers:
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Answer:
Correct answer letter C.
Explanation:
As we see in this problem, the total linear momentum is conserved, since there are no external forces acting in that system.
So, we can say that or
Now, the initial momentum is zero, because before the person starts climbing, the system (balloon plus person) are floating motionless, therefore we have:
(1)
We know that M > m, therefore, m/M < 1 and using (1) we can deduce that V(balloon) < v(person).
Finally, we can say that the balloon moves down (because of the minus sign of V(balloon)) and its speed is less than v(person). Correct answer letter C.
I hope it helps you!