Air is warmed and moisten as it moves through both the mouth and nasal passages.a. True
b. False

Answers

Answer 1

Answer:

Answer: The given statement is true.

Transport of oxygen from the air takes place through respiratory system. Oxygen from air ( that is taken from the atmosphere) enters via a system of tubes, into our lungs and then it is released into the bloodstream ( to serve in various organs) whereas opposite route is followed by CO2 ( carbon dioxide).

In the respiratory tract, the nose is lined by mucosal epithelium that possessed glands ( which secrete thick mucus). Due to this, air is moistened. Beneath the epithelium surface, there lies network of blood vessels that help in warming the nasal cavity and thus the air is warmed.

Answer 2

Answer:

Answer: True

Explanation: On Edge 2020

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A wedge is simply a form of an inclined plane. TRUE or FALSE.

Answers

The statement about "A wedge is simply a form of an inclined plane" is false. The pivot joint is the lever and the wedge are the blades of the scissors. This is to efficiently exert force on an object to cut it.

Solve the problem.The Bay area of California was shaken by an earthquake on October 17, 1989. The epicenter was located at Loma Prieta. The diameter of the earthquake's horizontal waves that shocked the area measured about 120 miles. How many square miles were affected by this earthquake?

Answers

As the shock waves travel in concentric outward circles from the epicenter, and the diameter is measured 120 miles,
area of a circle =πr*r

d=120
r=120/2r=6060*60=36003600*π=11309.734
11309.734 square miles

When two electron in a chemical bond are equally shared between two different atoms, what is the bond

Answers

When two electron in a chemical bond are equally shared between two different atoms, the bond is covalent bond.

What is covalent bond?

A chemical bond known as a covalent bond includes the exchanging of electrons between atoms to create electron pairs.

These electron couples are referred to as bonding pairs or sharing pairs. Covalent bonding is the stable equilibrium of attracting and repulsive forces that exists when two atoms share an electron.

The ability of each atom to reach the equivalent of a full valence shell, which corresponds to a stable electronic state, is made possible for many molecules by the sharing of electrons. Hence, when two electron in a chemical bond are equally shared between two different atoms, the bond is covalent bond.

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When two electrons are equally shared between two atoms it is a molecular compound using a single non polar covalent bond.

A 15g bullet travelling at 100m/s strikes and is absorbed by a 75kg object. Find the speed at which the final object moves.

Answers

The final object will move with a speed of 1.9 x 10⁻² m/s.

What is law of conservation of momentum ?

According to the law of conservation of momentum, when two objects meet in a closed system, the sum of their momentums before and after the collision is constant.

Here,

Initial velocity of the bullet, u = 100 m/s

Mass of the bullet, m = 15 g = 0.015 kg

Mass of the object, M = 75 kg

Total momentum before collision, P₁ = mu + (M x 0)

P₁ = 0.015 x 100

P₁ = 1.5 Kgm/s

Total momentum after collision, P₂ = (m + M)v

P₂ = (0.015 + 75)v

P₂ = 75.015 v

According to law of conservation of momentum,

P₁ = P₂

1.5 = 75.015 v

Therefore, the speed with which the final object moves,

v = 1.5/75.015

v = 1.9 x 10⁻² m/s

Hence,

The final object will move with a speed of 1.9 x 10⁻² m/s.

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what i got was
speed of impact that is 44.27 m/s
or 159.38 km/h
time until impact is 4.525
and last is the Energy at impact which I calauated outcome was 73500.00 joules

"At a cross-country track meet, Alicia ran 8 mph for the first part of the race, then increased her speed to 12 mph for the second part. If the race was 21 miles long and Alicia finished in 2 hours, how far did she run at the faster pace?"

Answers

Alicia ran 15 miles at the faster pace.

Formulating the equations:

Let Alicia run with the speed of 12mph for A hours and with the speed of 8mph for B hours.

Total distance is 21 miles, so we can make the first equation as:

12A + 8B = 21 .............(i)

Now the total time taken is 2 hours, which means:

A + B = 2 ..............(ii)

Now multiply equation (ii) by 8 and subtract from equation (i)

then we get, 4A = 5

A = 5/4 hours

So Alicia run at the speed of 12mph for 5/4 hours, total distance covered is:

d = 12 × 5/4

d = 15 miles

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Answer:

15 miles

Explanation:

Alicia's speed in the first part of the race is:

$v_1 = (d_1)/(t_1)=8 mph$

where $d_1$ is the length of the first part and $t_1$ the time taken to cover this part.

Alicia's speed in the second part of the race is:

$v_2 = (d_2)/(t_2)=12 mph$

where $d_2$ is the length of the second part and $t_2$ the time taken to cover this part.

The total length of the race is

$d=d_1 +d_2 = 21 mph$

And the total time taken by Alicia to complete the race is

$t=t_1 + t_2 = 2 h$

We have in total 4 equations with 4 unknown quantities. From the first 2 equations we find:

$d_1 = 8t_1\nd_2 = 12 t_2$

And substituting into the second group of equations:

$8t_1 + 12t_2 =21\nt_1 + t_2 = 2$

Calling A the first equation and B the second equation, if we compute (A-8B) we get:

$4t_2 = 5 \rightarrow t_2 = 1.25h$

And so

$t_1 = 2-t_2 = 0.75 h$

So Alicia runs for 1.25 hours at 12 mph (second part of the race). Therefore, the distance travelled during this part is:

$d_2 = v_2 t_2 = 12 \cdot 1.25 = 15 mi$

Therefore the answer is 15 miles.

An electromagnet is a device in which moving electric charges (current) in a coil of wire create a magnet. What’s one advantage of using electromagnets in devices? A Electromagnets have a strong, constant magnetic field. B Electromagnets are more powerful than permanent magnets. C Electromagnets don’t need a source of electricity to work. D Electromagnets can easily be turned on and off.

Answers

The electromagnet can be adjusted for having different levels of magnetic fields by turning it on and off. Hence, option (D) is correct.

What is an Electromagnet?

Electromagnets are made by winding a wire through a magnetic material such as a soft iron core making a coil and then passing an electric current through the coil thus making the soft iron core magnetic.

The characteristics of electromagnets are as follows -

The strength of the electromagnet depends on the number of coils and also the size of the electric current through the coil.
Permanent or regular magnets on the other hand do not require power but depend on the type of material used to make it.
It is advantageous to use electromagnets as compared to using permanent magnets since the strength of the electromagnet can be easily adjusted by regulating the amount of current flowing through the coils.

Thus, we can conclude that the electromagnet can be adjusted for having different levels of magnetic fields by turning it on and off. Hence, option (D) is correct.

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Answer;

D Electromagnets can easily be turned on and off.

Explanation;

Electromagnets are made by winding a wire through a magnetic material such as soft iron core making a coil, and then passing electric current through the coil thus making the soft iron core magnetic.
The strength of the electromagnet depends on the number of coils and also the size of the electric current through the coil.
Permanent or regular magnets on the other hand do not require power but depends on the type of material used to make it.
Therefore, its advantageous to use electromagnets as compared to using permanent magnets since the strength of the electromagnet can be easily adjusted by regulating the amount of current flowing through the coils. Thus, the electromagnet can be adjusted for have different levels of magnetic fields.