PHYSICS HIGH SCHOOL

16. The spreading of sound waves around openings in barriers is called A. reverberation.
B. an echo.
C. diffraction.
D. refraction.

Answers

Answer 1
Answer: C. diffraction
Diffraction by description is occurrence where the sound wave is interrupted or interacts with certain obstructions or barriers. According to Huygens-Fresnel principle, it is where the waves are interfered by said circumstances during its travel in the confined specific space. Furthermore, the amount of size the wavelength is directly proportional to its interacted slit or barrier thus, these behaviors and amount are positively correlated. Moreover, it occurs in a variety of waves –may it be sound waves, water waves or electromagnetic waves.



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Which explanation of the solar system best fits the observations of the planets and how they orbit the sun?A. The gravity of a large, massive star passing the sun ripped off blobs of material from it that formed the planets

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C. The sun and planets formed from a collapsing spinning cloud of gas and dust.

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I'm pretty sure it's C?

Answers

Answer: C. The sun and planets formed from a collapsing spinning cloud of gas and dust.

Explanation:

The entire solar system was formed from solar nebula. A nebula is a cloud of dust and gases. When this cloud spins and contracts, a protostar is formed. The temperature rises and nuclear fusion kicks in forming a star. The rest of the matter forms planets and other celestial bodies of the star system. Similarly, the Sun was formed in solar nebula from collapsing of spinning cloud of dust and gas.

You're right, Answer C

The dust and gas accumulate to form a solar nebula, which later on creates the star and the planets.

Which geochemical cycle involves mantle convection

Answers

the answer is rock cycle

What is another unit for momentum besides kg-m/s?
a. N
b. N-s
c. N-s2
d. N/s

Answers

'Newton-second' is dimensionally equivalent to 'kilogram-meter/second'.

A body of mass 2 kg is moving in the positive X-Direction with a speed of 4 m/s collides head on with an another body of mass 3 kg moving in the negative X-Direction with a speed of 1 m/s . During collision a loud sound is heard and they both start moving together . the sound energy cannot be greater than :A) 12 J
B) 14 J
C) 15 J
D) 17.5 J

Answers

m_1=2 \n m_2=3 \n v_1=4 \n v_2=1 \n v\text{ =speed after collision (to be determined)}.

The momentul of the system preserves:

m_1v_1-m_2v_2=(m_1+m_2)v \ \ \ \ \ \Rightarrow \ \ \ \ \ v=(m_1v_1-m_2v_2)/(m_1+m_2).

Ok, we found the speed after the collision.
Now, because the impact is plastic, it produces heat, sound energy and who knows what other forms of energy. We denote all this wasted energy with E.

Now, we write the energy conservation law:

(m_1v_1^2)/(2)+(m_2v^2_2)/(2)=((m_1+m_2)v^2)/(2)+E

From the above equation, you find E,  and then conclude that the sound energy can certainly not be greater than this.

How many hydrogen atoms are found in two molecules of hydroxylamine, 2NH2OH?

Answers

Answer:

There are 6 Hydrogen atoms present in two molecules of  Hydroxylamine.

Explanation:

Hydroxylamine is an inorganic compound having formula : NH₂OH

In one molecule of Hydroxylamine, NH₂OH there are 3 atoms of Hydrogen.

NH₂OH: 2+1 = 3

So two molecules of Hydroxylamine would contain 2 × 3 = 6 atoms of Hydrogen.

2 NH₂OH : (2×2)+(2×1) = 6
It would be six because in every one molecule, there are three atoms of hydrogen, so just double that and you have six.

Greyhounds can accelerate at 7 m/s2 at the start of a race. How much force does it take a 35 kg dog to produce this acceleration

Answers


Force = (mass) x (acceleration)              Newton's second law of motion.

Force = (35 kg) x (7 m/s²)  =  245 newtons

                                    (about  55 pounds)
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