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3 years ago

Which atom contains exactly 15 protons

Physics

2 answers:

Dima020 [189]3 years ago

8 0

An atom with 15 protons also has an atomic number of 15

VMariaS [17]3 years ago

5 0

Every atom with 15 protons in its nucleus
is an atom of Phosphorus.

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Of the four most important pathways by which stress affects health, the first one to occuris usually related to physiology

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Answer: Physiologic response to fear is very similar to that of PTSD and stress. Fear is accompanied by increased heart rate due to the release of adrenaline, sympathetic nervous system is aroused. The release of adrenaline also causes increased sweating, pulse and blood pressure. In line with this, the parasympathetic nervous system experiences reduced activity such as decrease in digestion.

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4 years ago

An aeroplane cruises at normal speed. Upon fl ying into turbulent (unstable) air, it suddenly drops downwards vertically. Passen

fredd [130]

Answer:

Your answer would be D. be pushed down into their seats.

Explanation:

You can think of it this way:

If you're not wearing a seat belt on an airplane that drops suddenly, in this case, vertically, which often happens with turbulence- you're the one at rest. You'll stay at rest as the plane (literally) drops out from under you.

If you're strapped in, the seat belt serves as an outside force acting on you, taking you with the plane as it drops and saving you from hitting the ceiling.

Always remember Newton's first law of motion: A body at rest will remain at rest unless an outside force acts on it.

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3 years ago

what is the acceleration produced by the resultant force acting on an object if the coefficient of friction acting between the b

LenKa [72]

The acceleration of the block is $-0.98 m/s^2$

Explanation:

The expression for the force of friction acting on the block is (assuming the surface is horizontal and flat):

$F_f = -\mu mg$

where

$\mu$ is the coefficient of friction

m is the mass of the block

g is the acceleration of gravity

and where the negative sign means the direction of the force is opposite to that of the motion of the block

If this is the only force acting on the object, then this is also the resultant force, so we can rewrite Newton's second law as:

$F=ma\\-\mu mg = ma$

where

a is the acceleration of the block

Re-arranging the equation,

$a=-\mu g$

And so this is the expression for the acceleration of the block acted upon the force of friction.

In this problem, we have:

$\mu=0.1$

$g=9.8 m/s^2$

Solving,

$a=-(0.1)(9.8)=-0.98 m/s^2$

Learn more about friction:

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#LearnwithBrainly

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3 years ago

Which of the following has to happen before the eardrum begins to vibrate with the same frequency as the source of the sound wav

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Answer:

C. The outer ear has to collect the sound waves and lead them to the middle ear.

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In the process of hearing, the first thing that happens is that sound waves enter the outer ear through a passage called "auditory canal" that reaches the eardrum.

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