3 years ago

Which statement about a flat magnet that can stick onto a refrigerator is true

1 answer:

7 0

The magnetic particles are mixed with other substances to make it flexible.

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xxMikexx [17]

Answer:

a) 30.84m/s

b) 348.32Hz

c) 32.34m/s

d) 289.69Hz

Explanation:

a) If 1 mile=1609,34m, and 1 hour=3600 seconds, then 69mph=69*1609.34m/3600s=30.84m/s

b) Based on Doppler effect:

/*I will take as positive direction the vector $\vec r_{observer}-\vec r_{emiter}$ */

$f_{observed}=(\frac{v_{sound}-v_{observed}}{v_{sound}-v_{emited}})f_{emited}$

$f_{observed}=(\frac{343m/s-0m/s}{343m/s-30.84m/s})317Hz=348.32Hz$

c) $350Hz=(\frac{343m/s-0m/s}{343m/s-v_{ambulance}})317Hz, V_{ambulance}=343m/s-\frac{317Hz}{350Hz}.343m/s=32.34m/s$

d) $f_{observed}=(\frac{343m/s-0m/s}{343m/s+32.34m/s})317Hz=289.69Hz$

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Vikki [24]

Transparent - Diamond, water, air, prism, cellophane sheet, frosted glass, glasses, clear tape, non colored plastic, lenses

Translucent - Butter paper, parchent paper, plastics, clouds, thin fabrics, colored plastics, tinted glass

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Cloud [144]

If basically means to move quickly

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frutty [35]

Your answer should be A, because every reaction has an equal opposite reaction

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Andrej [43]

I'm not sure about the magnitude, but the direction of the normal force is upward.

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