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3 years ago

Thanks+ BRAINLIST only for correct answers

Physics

2 answers:

Maslowich3 years ago

8 0

Answer:

First) is b

Second) is true

Third) is C (not sure tho)

Explanation:

Because of their longer wavelengths, AM waves reflect off a layer of the upper atmosphere called the ionosphere.

antiseptic1488 [7]3 years ago

7 0

1st-B

2nd-A

3rd-C variation in frequency

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Hi there!

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Wsinθ = downward acceleration along incline due to gravity (N)

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A = applied force (N)

The acceleration due to gravity and friction force act in the same direction, so:

Wsinθ + Fκ = A

Solve for sinθ using right triangle trigonometry:

sinθ = O/H = 3/6 = 0.5

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Fκ = A - 0.5W

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Now, recall that:

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Since the box's displacement is in the same axis as the force but OPPOSITE direction, we must use:

W = Fdcosθ

Angle between displacement and friction force is 180°.

cos(180) = -1

Work done by friction = -Fd = -10.4(6) = -62.4 J

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The answer to your question is.

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