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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Answer:
0.075 T
Explanation:
When a current-carrying wire is immersed in a region with magnetic field, the wire experiences a force, given by
where
I is the current in the wire
L is the length of the wire
B is the strength of the magnetic field
is the angle between the direction of I and B
In this problem we have:
L = 0.65 m is the length of the wire
I = 8.2 A is the current in the wire
F = 0.40 N is the force experienced by the wire
since the current is at right angle with the magnetic field
Solving the formula for B, we find the strength of the magnetic field: