Answer:
31.4 m/s
Explanation:
The Doppler equation describes how sound frequency depends on relative velocities:
fr = fs (c + vr)/(c + vs),
where fr is the frequency heard by the receiver,
fs is the frequency emitted at the source,
c is the speed of sound,
vr is the velocity of the receiver,
and vs is the velocity of the source.
Note: vr is positive if the receiver is moving towards the source, negative if away.
Conversely, vs is positive if the receiver is moving away from the source, and negative if towards.
Given:
fs = 1000 Hz
fr = 1100 Hz
c = 345 m/s
vr = 0 m/s
Find: vs
1100 = 1000 (345 + 0) / (345 + vs)
vs = -31.4
The speed of the car is 31.4 m/s.
To solve any problem in math or physics, you collect all the formulas,
laws, rules, and equations that you know about the subject, then, along
with the given information, use them to find the missing information.
So the answer to "how" really depends on what information you're given.
Answer:
The answer is Friction.
Hope this helps :)
Please mark me brainliest :)
She did not have a control group, and she did not expose all three samples to wind. Because her hypothesis was a combination of things, she needed to test the different combinations.
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Answer:
b.
Explanation:
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<em><u>f</u></em><em><u>=</u></em>1/power
