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3 years ago

Select the correct answer.

Physics

1 answer:

mezya [45]3 years ago

6 0

Answer:

A. They diverge on refraction

Explanation:

The concave lens has the physical characteristics that both sides are curved inwardly. Due to this physical nature, the lens is thicker towards the outer circumference.
Due to such physical characteristics of a concave lens, when parallel light rays strike on a concave lens, it is refracted and diverge out from the other side.
When the diverging rays are traced back, it seems as if the rays are appearing from a point.
This point is where the rays seem to appear is called the principal focus of the lens.
Thus the image formed by the concave lens is erect, virtual and diminished.

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Which items in this picture provide insulation?

Verdich [7]

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Explanation:

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4 years ago

When a 15.00 kg mass is attached to a vertical spring, the spring is stretched 2.0 m such that the mass is 6.0 m above the table

Marysya12 [62]

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3 years ago

Caroline, a piano tuner, suspects that a piano's G4 key is out of tune. Normally, she would play the key along with her G4 tunin

alexira [117]

Answer:

e. 425.9 Hz

Explanation:

The computation of the frequency is being played by the out-of-tune key is shown below;

Given that

Δf1 = x - 349.2 = 76.7.........(1)

Δf2 = 440 - x = 14.1......(2)

Now solve (1) and (2)

(440 - x) - x + 349.2 = 14.1 - 76.7

789.2 + (-2x) = -62.6

x = 425.9 Hz

Hence, the frequency is being played by the out-of-tune key is 425.9 Hz

Therefore the option e is correct

6 0

3 years ago

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denis23 [38]

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6 0

3 years ago

Alternating Current In Europe, the voltage of the alternating current coming through an electrical outlet can be modeled by the

stealth61 [152]

Answer:

$\frac{50}{\pi }$ Hz

Explanation:

In alternating current (AC) circuits, voltage (V) oscillates in a sine wave pattern and has a general equation as a function of time (t) as follows;

V(t) = V sin (ωt + Ф) -----------------(i)

Where;

V = amplitude value of the voltage

ω = angular frequency = 2 π f [f = cyclic frequency or simply, frequency]

Ф = phase difference between voltage and current.

Now,

From the question,

V(t) = 230 sin (100t) ---------------(ii)

By comparing equations (i) and (ii) the following holds;

V = 230

ω = 100

Ф = 0

But;

ω = 2 π f = 100

2 π f = 100 [divide both sides by 2]

π f = 50

f = $\frac{50}{\pi }$ Hz

Therefore, the frequency of the voltage is $\frac{50}{\pi }$ Hz

7 0

3 years ago