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2 years ago

Select the correct answer

Physics

2 answers:

Monica [59]2 years ago

8 0

Explanation:

Constant speed => Zero acceleration

Since Fnet = ma, when a = 0, Fnet = 0.

The best answer here is:

"The net force acing on the car from all directions is zero."

Rasek [7]2 years ago

5 0

Answer:

I would say the net force acting on the car is in the opposite direction of the car's motion is correct

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If two equal forces act on an object in opposite directions, what is the net

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Answer:

Net Force = 0

Explanation:

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3 years ago

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Answer:

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2 years ago

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Answer:

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Which single force acts on a object in a free fall

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Answer:

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2 years ago

Help with the two questions above? Correct answers?

LenKa [72]

(6) first choice: the frequency appears higher and wavelength is shorter.

The car approaches a stationary observer and so the sound will appear to have shorter wavelength. This creates an effect of its siren to sound with higher frequency than it would do if both were stationary.

(7) The Doppler formula for frequency in the case of a stationary observer and source approaching it is as follows:

$f_O = \frac{v}{v-v_s}\cdot f= \frac{343\frac{m}{s}}{(343-25)\frac{m}{s}}\cdot 400Hz \approx 431Hz$

The wavelength is then

$\lambda = \frac{343\frac{m}{s}}{431Hz}\approx 0.80 m$

The third choice "0.80m; 431Hz" is correct

7 0

2 years ago