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egoroff_w [7]
3 years ago
6

The atmosphere is made up of several layers of air. The bottom two layers are the troposphere and the stratosphere. How does the

troposphere differ from the stratosphere?
Physics
1 answer:
Andrej [43]3 years ago
6 0

Troposhere is differ from stratosphere by the following reason

1. all weather pheonamena take place in trosphere

2. in trosposphere temperature increase by increasing height which is just opposite in the case of stratosphere

3. the maximum air is found in trosposphere

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What are chlorofluorocarbons and what impact do they have on the atmosphere?
Sladkaya [172]

Explanation :

Chlorofluorocarbons are abbreviated as CFC. It contains only carbon, fluorine, and chlorine. Initially, CFC is used as refrigerants.

Impact of chlorofluorocarbons on the atmosphere are :

(1) It damages the earth's ozone layer. So, it was banned in 1996.

(2) It also contributes to global warming.  

(3) They have lived in atmosphere of about 20 to 100 years.

8 0
3 years ago
Calculate the energy that 1.5 kg of mass contains
Vsevolod [243]

Answer:

4.5(10)^8 joules

Explanation:

Mass–energy equivalence is the principle that says that anything that has mass has an equivalent amount of energy. Converse is also true.

The relation between energy and mass is given by E=mc^2

Here, E denotes energy, m denotes mass and c denotes speed of light

Mass (m)=1.5\,\,kg

Speed of light (c) = 3 × 10^8 m/s

Therefore,

E=1.5(3)(10)^8=4.5(10)^8  joules.

The S.I. unit of energy is joules which is equal to 1\,\,kg\,\,m^2/s^2

4 0
3 years ago
Date
sergiy2304 [10]

Answer:

Because Kinetic Energy(KE) is not the same as Momentum(P)

Kinetic Energy is a scalar(has magnitude only). For a body of mass M, velocity V:

KE = 0.5MV^2

The units of KE: Joules.

Energy is the ability to do work.

Momentum is not a form of energy.

Momentum is a vector(has magnitude and direction).

P = MV

Units of momentum: kg m/s

If you have rifles of mass 2, 4, 8, 16 kg, using the same cartridge, with the same load, barrel length(remember momentum of projectile is proportional to velocity), they all have the same recoil momentum.

But the kinetic energy of recoil would be inversely proportional to the mass of the gun.

Thus the 2kg gun(possible even in large powerful calibers due to modern materials like titanium etc), would have 8 times the recoil ENERGY of the 16kg gun.

A lot of confusion exists in America because of retention of old units, namely Foot Pounds(force) for KE, and Pounds(mass) Feet Per Second for Momentum(P). Because of the more awkward momentum units, a lot of old books had a bad habit of calling the momentum units Pounds Feet, leaving out the rest. Naturally this created confusion with Foot Pounds. Multiplication being commutative and all that:).

Remember that the momentum of the rifles is the same. But the ones with the highest recoil energy hurt the most.

Speaking of hurt:

If momentum killed, then consider two dinosaur killer asteroids with the same masses and velocities, striking vertically at the same time antipodal points on the Earth’s surface. Total momentum delivered would be Zero. That would not make us safe at all:)

Similarly, being shot simultaneously at close range from opposite sides with a 5 round burst from each from two M4 assault rifles(by definition must be able to fire full auto) delivered in 0.3 seconds, would deliver zero momentum. But not zero harm.

Also, the recoil momentum of any firearm is equal to the mass of projectile x velocity + mass of propellant x exit velocity of propellant. This is obviously greater, often much greater, depending on range, than the striking momentum of the projectile at the target.

The recoil kinetic energy is vastly less than the kinetic energy of the bullet/projectile. Neglecting propellant contribution:

recoil Momentum = bullet momentum

BUT:

recoil KE/bullet KE = projectile mass/gun mass

This is a very small fraction.

If we consider the M4 carried by American military:

M855(SS109 equivalent) 5.56 bullet of mass 0.004kg(62 grains)is fired from M4 assault rifle of mass, with optic and full mag 4kg, a thousand times as much!

Even allowing for the 0.0015kg powder charge, and the higher velocity of the powder(approx 1400=1500 m/s vs approx 900 m/s muzzle velocity of the bullet), the recoil energy is hundreds of times less than the muzzle energy of the bullet.

That’s why you want to be behind the gun, and not in front.

Explanation:

7 0
3 years ago
Which choice is the BEST source of PROTEIN?<br> 1 Meat<br> 2 Bread<br> 3 Rice<br> 4 Apples
Kryger [21]

Answer: It's 1 meat.

Explanation: Meat is a protein, bread and rice are grains, Apples are fruit!

Your welcome

8 0
2 years ago
Read 2 more answers
How do you measure the wavelength of a wave?
antiseptic1488 [7]

Answer: velocity divided by frequency

Explanation: wave speed or velocity measured in meters per second divided by frequency of wave measured in hz

4 0
3 years ago
Read 2 more answers
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