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zvonat [6]
3 years ago
7

Which diagram best illustrates what happens when electromagnetic waves strike a reflective material? ANSWER: D

Physics
2 answers:
hodyreva [135]3 years ago
6 0
We have no way to tell whether the answer is really D,
because you haven't posted the choices, so we don't
know what ' D ' says.

I hope you were helpful to yourself.
guapka [62]3 years ago
4 0

Answer:

The answer is D

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While tuning a string to the note C at 523 Hz, a piano tuner hears 2.00 beats/s between a reference oscillator and the string.
lara31 [8.8K]

Answer:

a)the possible frequencies are 521hz ,522hz, 523, 524hz,525hz

b) 526hz

c)0.989 or a 1.14% decrease in tension

Explanation:

a) While tuning a string at 523 Hz,piano tuner hears 2.00 beats/s between a reference oscillator and the string.

The possible frequencies of the string can be calculated by

fl=f' - B

where

fl= lower limit of the possible frequency

f'= frequency of the string

B= beat heard by the tuner

fl= 523hz + Or - (2beats/secs * 1hz/1beat per sc)

fl= 521hz or 525hz

So the possible frequencies are 521hz ,522hz, 523, 524hz,525hz

b)fl=f' - B

523hz= f' - 3

f'= 523 + 3= 526hz

c) The tension is directly proportional to the square of the frequencies

T1/T2 =f1^2/f2^2

523^2 / 526^2 = 0.989 or a 1.14% decrease in tensio

6 0
3 years ago
What is the kinetic energy in joules of a 0.05. kg bullet traveling 310 m/s
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