A metal sphere is neutral because it has an equal number of protons and electrons. Draw how the charges in the sphere are redist
2 answers:
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The speed of the wave in the string is 83.4 m/s
Explanation:
For a standing wave in a string, the speed of the wave is given by the equation:
where
L is the length of the string
T is the tension in the string
m is the mass of the string
In this problem, we have:
L = 0.72 m
m = 4.2 g = 0.0042 kg
T = 84.1 N
Solving the equation, we find the speed of the wave:
Learn more about waves:
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a) 10.5 m/s
While for observer 1, in motion with the car, the ball falls down straight vertically, according to observer 2, which is at rest, the ball is also moving with a horizontal speed of:
As the ball falls down, it also gains speed along the vertical direction (due to the effect of gravity). The vertical speed is given by
where
is the initial vertical speed
g = 9.8 m/s^2 is the acceleration of gravity
t is the time
Therefore, after t = 1.00 s, the vertical speed is
And so the speed of the ball, as observed by observer 2 at rest, is given by the resultant of the horizontal and vertical speed:
b)
As we discussed in previous part, according to observer 2 the ball is travelling both horizontally and vertically.
The direction of travel of the ball, according to observer 2, is given by
We have to understand in which direction is this angle measured. In fact, the car is moving forward, so has forward direction (we can say it is positive if we take forward as positive direction).
Also, the ball is moving downward, so is negative (assuming upward is the positive direction). This means that the direction of the ball is forward-downward, so the angle above is measured as angle below the positive horizontal direction: