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Answer:
The time taken for the ball to fly up in the air and back down again is 3.058 seconds.
Explanation:
Since the ball ends up at the same vertical distance ( on the ground) as it was at the start of its motion, we can set the total displacement of the ball equal to 0.
Thus, this problem can be simply solved by the following equation of motion:
Here, s = total change in distance = 0 m
u = initial speed = 15 m/s
a = acceleration due to gravity = -9.81 m/s^2
t = time (to be found)
Substituting these values in the equation we get:
t = 3.058 seconds
So, the time taken for the ball to fly up in the air and back down again is 3.058 seconds.
When two sound sources of the same amplitude and similar frequencies f₁ and f₂ are played at a time, beats are produced with a frequency given by:
Since the guitar player wants to hear 9 beats in 2 seconds, then:
Then, the pitches that can be used are those whose difference with respect to the frequency of 343Hz is 4.5Hz:
Therefore, the pitches he could bend the string to, are 347.5Hz and 338.5Hz.