2 years ago

How does the Doppler effect cause a siren's pitch to increase as it

Physics

1 answer:

Likurg_2 [28]2 years ago

5 0

Answer:

Sound waves are pushed closer together, decreasing wavelength

and increasing frequency.

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A ball that has a mechanical energy of 65 J has 12 J of kinetic energy. The ball has J of potential energy.

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An object is placed 10 cm in front of a diverging mirror. What is the focal length of the mirror if the image appears 2 cm behin

Dafna1 [17]

Answer:

the focal length of the mirror is : $f=-2.5\,\,cm$

Explanation:

Use the formula for the formation of image using a divergent mirror and recalling that the image (s') that this mirror formed is virtual, so it is entered as a negative number in the formula. Use the object position (s) as 10, the image position (s') as -2, and derive the value of the focal length:

$\frac{1}{s} +\frac{1}{s'}=\frac{1}{f}\\\frac{1}{10} +\frac{1}{-2}=\frac{1}{f}\\\frac{1}{10} -\frac{1}{2}=\frac{1}{f}\\\frac{10\,f}{10} -\frac{10\,f}{2}=\frac{10\,f}{f}\\f-5\,f=10\\-4\,f=10\\f=-2.5\,\,cm$

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3 years ago

What is an example of an ionic bond

Anvisha [2.4K]

Na + Cl

An ionic bond is made between a metal and a non-metal

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2 years ago

Balance this chemical equation Fe(s) + 02(g) --- Fe0(s)

Softa [21]

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3 years ago

An object is projected with initial speed v0 from the edge of the roof of a building that has height H. The initial velocity of

Vsevolod [243]

Answer:

Explanation:

Initial velocity u = V₀ in upward direction so it will be negative

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Displacement s = H . It is downwards so it will be positive

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Using the formula

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3 years ago