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xenn [34]
3 years ago
12

Cellular phones use _____?

Physics
2 answers:
mina [271]3 years ago
6 0

3. D-Microwaves

1. C-electromagnetic spectrum

2. B-radio waves

^^(for those doing the three question physical science test)

dangina [55]3 years ago
3 0
Let's see: frequency of cellular phone waves (GSM phones) is (800-1900 MHz). If we look at the table of the electromagnetic spectrum, we can see that this range is contained within the frequencies of the microwaves, which include waves in the range 300 MHz-300 GHz.

So, summarizing, the correct answer is "microwaves".
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Typically, atoms gain or lose electrons to achieve
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Typically, atoms gain or lose electrons to achieve a stable electron configuration.

Explanation:

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Slow moving vehicles must display ___________ emblem at the rear to warn of their low speed.
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There are (one can say) three coequal theories of motion for a single particle: Newton's second law, stating that the total forc
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Answer:

vf = 14.2176 m/s

Explanation:

Given

m = 4 Kg

viy = 7.00 ĵ m/s

Fx = 11.0 î N

t = 4.5 s

vf = ?

Using the Impulse - Momentum Theorem, we have

F*Δt = m*Δv    ⇒  F*Δt = m*(vf - vi)

⇒    vf = (F*Δt + m*vi) / m

⇒    vf = (F*Δt + m*vi) / m

For <em>x-component</em>

⇒    vfx = (Fx*Δt + m*vix) / m = (11 N*4.5 s + 4 Kg*0 m/s) / (4 Kg)

⇒    vfx = 12.375 î m/s

For <em>y-component</em>

⇒    vfy = (Fy*Δt + m*viy) / m = (0 N*4.5 s + 4 Kg*7 m/s) / (4 Kg)

⇒    vfy = 7 ĵ m/s

Finally:

vf = √(vfx² + vfy²)

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⇒   vf = 14.2176 m/s

8 0
3 years ago
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