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laila [671]
2 years ago
15

Which of the following statements is true of electromagnetic waves but NOT mechanical waves.

Physics
1 answer:
Neko [114]2 years ago
4 0

Answer:

a

Explanation:

what the heck is a medium

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A ball was rolling downhill at 2 m/s. After 5s, it was rolling at 90 m/s. What is its acceleration?
olga55 [171]

Answer:

17.6 m/s²

Explanation:

Given:

v_{f} = 90 m/s (final velocity)

v_{i} = 2 m/s (initial velocity)

Δt = 5s (change in time)

The formula for acceleration is:

a_{avg} = Δv / Δt

We can find Δv by doing

Δv = v_{f} - v_{i}

Replace the values

Δv = 90m/s - 2m/s

Δv= 88m/s

Using the equation from earlier, we can find the acceleration by dividing the average velocity by time.

a_{avg} = Δv / Δt

a_{avg} = \frac{88m/s}{5/s}

acceleration = 17.6 m/s^{2}

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2 years ago
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Answer: 32

Explanation:

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Because AC emf is a sine wave
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