Magnets always point towards north or south. It has been proven that magnets of the same magnetic poles repel each other and those that have different magnetic poles attract each other. Therefore, for the case of N-S magnetic pole, they attract.
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Answer:
v = 8.8 m /s
Explanation:
For listener and source going away from each other the formula of Doppler effect is as follows

V is velocity of sound , v is velocity of listner and source of sound
f₀ is apparent frequency and f is real frequency
V = 343 , v = ? ,f = 210 , f₀ = 221
Put these value in the relation above
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v = 8.8 m /s
We see more and more of the lighted side of the moon.
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