A copper rod at 25°C is 2.5 m long. How long would it take a sound to move through the rod from one end to another? how would I
2 answers:
Answer;The time taken by they sound to move from one end of the rod to another end is 0.00054 seconds.
Explanation;
Speed of sound in the copper = 4600 m/s
Length of the copper rod = 2.5 m
Distance covered by the sound = length of the copper
The time taken by they sound to move from one end of the rod to another end is 0.00054 seconds.
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Answer:
The minimum thickness = 83.92 nm
Explanation:
The relation between the wavelength in a particular medium and refractive index
where ;
= wavelength of the light in vacuum
n = refractive index of medium with respect to vacuum
For one phase change :
Replacing 1.43 for n and 480 nm for λ; we have:
t = 83.92 nm
Thus; the minimum thickness = 83.92 nm
Answer:
2. at the lowest point
Explanation:
The motion of the pendulum is a continuous conversion between kinetic energy (KE) and gravitational potential energy (GPE). This is because the mechanical energy of the pendulum, which is sum of KE and GPE, is constant:
E = KE + GPE = const.
Therefore, when KE is maximum, GPE is minimum, and viceversa.
So, the point of the motion where the KE is maximum is where the GPE is minimum: and since the GPE is directly proportional to the heigth of the bob:
we see that GPE is minimum when the bob is at the lowest point,so the correct answer is
2. at the lowest point