Two balls are thrown off a building with the same speed, one straight up and one at a 45° angle. Which statement is true if air
1 answer:
Answer:
c. Both hit the ground with the same speed.
Explanation:
Given that speed of the both balls are same.
We know that kinetic energy given as
v=Speed , m= mass
If mass of the the balls are same then their kinetic energy will be same.
The potential energy PE
PE= m g h
h =height
Given that h is same ,therefore their potential energy will be same.
But the time taken by both the balls will be different.
Therefore answer is c.
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We make a graphic of this problem to define the angle.
The angle we can calculate through triangle relation, that is,
With this function we should only calculate the derivate in function of c
That is the rate of change of .
b) At this point we need only make a substitution of 0 for c in the equation previously found.
Hence we have finally the rate of change when c=0.
Answer:
Angular velocity,
Explanation:
The mass of the skater, M = 74.0 kg
Mass of each arm, ( since it is 13% of the whole body and each arm is considered)
Mass of the trunk,
Total moment of Inertia = (Moment of inertia of the arms) + (Moment of inertia of the trunks)
The final moment of inertia of the person:
According to the principle of conservation of angular momentum: