ans: B
Kinetic energy =
=
= 50J
ps. the height will only affect its potential energy, not kinetic.
Suppose a piano tuner hears 3 beats per sec-
1 answer:
Answer: 3 The string should be loosened because the frequency of the string is 5 Hz above the correct frequency.
Explanation: In order to explain this problem we have to consider the relationship bewteen the Tension and the frequency, this is given by:
We know that:
where μ and T are the mass linear density and Tension of teh string, respectively.
We also know that v=λ*ν the speed is related to the wavelength (λ) and the frequency (ν).
Then we have that frequency depents directely of the Tension (T) on the string.
In our case the frequency to be tuned is 3 Hz, firstly the piano tuner slightly tightening then he hears 5 beats per second (5 Hz). Then it is neccesary loose the tension on the string because the actual frequency is above to the correct frequency (3 Hz).
You might be interested in
Answer:
L= 2 mH
Explanation:
Given that
Frequency , f= 10 kHz
Maximum current ,I = 0.1 A
Maximum energy stored ,E= 1 x 10⁻⁵ J
The maximum energy stored in the inductor is given as follows
Where ,L= Inductance
I=Current
E=Energy
Now by putting the values in the above equation
L=0.002 H
L= 2 mH
We know that frequency f is given as
C=Capacitance , f=frequency ,L=Inductance
Now by putting the values
Therefore the inductance and capacitance will be 2 mH and 1.26 x 10⁻⁷ F respectively.