a ball is kicked on level ground with a speed of 30 m/s at angle of 40 degrees above horizontal g Find the minimum velocity of t
1 answer:
Answer:
<em>The minimum velocity of the ball during its flight is 22.98 m/s.</em>
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Explanation:
The velocity of the ball v = 30 m/s
The angle it makes with the horizontal ∅ = 40°
The minimum velocity of the ball during flight will be the horizontal axis component of the velocity, as acceleration is zero on this axis.
= v cos ∅
= 30 cos 40°
= 30 x 0.766 = <em>22.98 m/s</em>
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Explanation:
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Initial speed of the bag, u = 7.3 m/s
Height above ground, s = 24 m
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v = 22.88 m/s
So, the speed of the bag just before it reaches the ground is 22.38 m/s. Hence, this is the required solution.
Answer:
4.6 kHz
Explanation:
The formula for the Doppler effect allows us to find the frequency of the reflected wave:
where
f is the original frequency of the sound
v is the speed of sound
vs is the speed of the wave source
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f = 41.2 kHz
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vs = 33.0 m/s
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