1. If a rock is dropped from a 600 meter cliff, how long will it take to hit the ground? Dl
1 answer:
Answer:
11.1s
Explanation:
Given parameters:
Height of cliff = 600m
Unknown:
How long it takes to hit the ground = ?
Solution:
To solve this problem, we use one of the kinematics equation;
H = ut + gt²
H is the height
u is the initial velocity = 0m/s
t is the time taken
g is the acceleration due to gravity
600 = x 9.8 x t²
600 = 4.9t²
t² = 122.5
t = 11.1s
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Where n is the resonance node, v is the speed of sound in air and L is the length of a cylinder.
The fundamental frequency is simply the lowest resonant frequency.
We find it by plugging in n=1:
To find what harmonic has to be excited so that it resonates at f>20Hz we simply plug in f=20 Hz and find our n:
We can see that any resonant frequency is simply a multiple of a base frequency.
Let us find which harmonic resonates with the frequency 20 Hz:
Since n has to be an integer, final answer would be 323.