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3 years ago

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The angle of incidence is the angle between the the normal of the surface. and A. point of incidence B. reflected ray C. inciden

t ray D. refracted ray

2 answers:

hichkok12 [17]3 years ago

7 0

Answer:

The right answer is (A)

Explanation:

Trust me

lutik1710 [3]3 years ago

6 0

Answer: c. incident ray

Explanation:

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Which symbol represents a type of electromagnetic radiation released during radioactive decay?

Lena [83]

The correct option is (D) Gamma ( $_0^0\gamma$ )

Explanation:
Now this question is a tricky one because all of these options are somehow involved in radioactive decay; however, in this case the SYMBOL is required NOT the elements. There are three symbols involved in radioactive decay, which are:
1. α for alpha decay
2. β for beta decay
3. γ for gamma decay

In the options only one symbol is present which is gamma. Hence option (D) Gamma ( $_0^0\gamma$ ) is the correct answer.

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Todo sistema heterogêneo é bifásico

strojnjashka [21]

I don't understand the language.....

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In 2004 astronomers reported the discovery of a large Jupiter-sized planet orbiting very close to the star HD 179949 (hence the

sp2606 [1]

<span>I'll tell you how to do it but you must crunch the numbers.

Use Kepler's 3rd Law

T^2 = k R^3

where k = 4(pi)^2/ GM
G =gravitational constant = 6.67300 × 10-11 m3 kg-1 s-2
M = mass of this new planet
pi = 3.14159265
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R = (579,000,000km)/9 = 64333333.3 km

a)
Solve Kepler's 3rd Law for M. Your answer will be in kg

b)
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Form the ratio
M(planet)/M(sun) </span>

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3 years ago

Which describe the image formed by an object in

iris [78.8K]

Answer:

In a concave mirror, if an object is located between the center of curvature and the focal point, what is the best way to describe the image formed? Real, inverted, and smaller than the object. Real, inverted, and larger than the object. light rays travel parallel to each other, no other image is formed.

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3 years ago

Read 2 more answers

Practice: The speed of sound at sea level is normally about 340 m/s. A car honks its horn as it drives toward an observer. The f

stepan [7]

Answer:

25.5 m/s

Explanation:

The Doppler effect occurs when there is relative motion between a source of a wave and an observer. In such situation, there is a shift in the apparent frequency of the wave perceived by the observer.

The formula that gives the apparent frequency perceived by the observer is:

$f'=\frac{v\pm v_o}{v\pm v_s}f$

where

f is the real frequency of the wave

f' is the apparent frequency of the wave

v is the speed of the wave

$v_s$ is the velocity of the source (negative if the source is moving towards the observer, positive otherwise)

$v_o$ is the velocity of the observer (positive if the observer is moving towards the source, negative otherwise)

In this problem:

v = 340 m/s is the speed of sound

f = 800 Hz is the frequency of the horn

f' = 860 Hz is the apparent frequency

$v_o=0$ (the observer is at rest)

Re-arranging the equation for $v_s$ , we can find the velocity of the horn and the driver:

$f'=\frac{v}{v-v_s}f\\(v-v_s)f'=vf\\vf'-v_sf'=vf\\v_s=v\frac{f'-f}{f'}=(340)\frac{860-800}{860}=25.5 m/s$

So, 25.5 m/s towards the observer.

3 0

3 years ago