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3 years ago

15

11. Which of the following phenomena is taking place when sound waves are reflected from a surface along parallel lines? A. Refr

acting B. Absorption C. Focusing D. Diffusion

1 answer:

allsm [11]3 years ago

4 0

The Answer is C. Focusing

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A satellite is launched to orbit the Earth at an altitude of 2.90 x10^7 m for use in the Global Positioning System (GPS). Take t

marin [14]

Answer:

$T=66262.4s$

Explanation:

From the question we are told that:

Altitude $A=2.90 *10^7$

Mass $m=5.97 * 10^{24} kg$

Radius $r=6.38 *10^6 m.$

Generally the equation for Satellite Speed is mathematically given by

$V=(\frac{GM}{d} )^{0.5}$

$V=(\frac{6.67*10^{-11}*5.97 * 10^{24}}{6.38 *10^6+2.90 *10^7} )^{0.5}$

$V=3354.83m/s$

Therefore

Period T is Given as

$T=\frac{2 \pi *a}{V}$

$T=\frac{2 \pi *(6.38 *10^6+2.90 *10^7}{3354.83}$

$T=66262.4s$

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If a stereo has a dial that changes the volume of sounds the stereo makes what is the dial doing

vredina [299]

The volume dial is acting as a voltage divider or a variable resistor.

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Elements are arranged in the periodic table based on various patterns. For example, the element magnesium (Mg) A. has a higher a

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The right answer is A just did the question.

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Suddenly a worker picks up the bag of gravel. Use energy conservation to find the speed of the bucket after it has descended 2.3

fiasKO [112]

Explanation:

A worker picks up the bag of gravel. We need to find the speed of the bucket after it has descended 2.30 m from rest. It is case of conservation of energy. So,

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h = 2.3 m

$v=\sqrt{2\times 9.8\times 2.3} \\\\v=6.71\ m/s$

So, the speed of the bucket after it has descended 2.30 m from rest is 6.71 m/s.

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This kinda sus

Explanation:

maybe not on brainly?

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