when the c4 key on a piano keyboard is pressed, a string inside the piano is struck by a hammer and begins vibrating back and fo
2 answers:
Answer:
260 Hz
Explanation:
The frequency of a sound wave is defined as the number of oscillation which is given in cycles per time. Frequency (f) is given by the formula ;
and it is measured in Hertz(Hz)
Given that;
a vibration is caused by a struck string in piano at 260 cycles and Time (T) = 1 seconds
Frequency (f) can be determined as; 260 cycles × 1 seconds
= 260 Hertz (Hz)
Hence, the frequency of the sound wave is 260 Hertz (Hz).
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To solve this problem we will apply the concepts related to the momentum.
This is defined as the product between the change in velocity and the mass of the object, that is
Where,
m = mass
Final velocity
Initial velocity
Our values are given as,
m = 14kg
= 11m/s
<em>the negative Symbol implies that the direction is opposite to the initial one and therefore there is also a change in the sense of magnitude</em>
The negative symbol indicates that the momentum has a direction opposite to that of the initial velocity. Or failing that, it has the same direction of the final speed