Which shows the correct order of processes leading up to the formation of a main sequence star?


(A Gases condense to form a nebula, gravity causes the nebula to collapse and spin, nuclear fusion occurs, and a protostar forms.

(B A protostar forms, nuclear fusion occurs, gases condense to form a nebula, and gravity causes the nebula to collapse and spin.

(C Gases condense to form a nebula, gravity causes the nebula to collapse and spin, a protostar forms, and nuclear fusion occurs.

(D A protostar forms, gases condense to form a nebula, gravity causes the nebula to collapse and spin, and nuclear fusion occurs.

Answer:

friction

Explanation: The resistance that one surface or object encounters when moving over another.

Congo/Zaire region is the country which experienced chaos after their independence due to lack of experience in democratic self-government.

This type of government involves the people making legislative decisions and choosing those who will rule and represent them.

Congo/Zaire region was not self sufficient and were inexperienced in democratic self-government after independence which led to political crisis.

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Answer:

The proton has much greater mass

Explanation:

Answer:

D, a proton has a much greater mass.

Explanation:

An electron has a mass close to nothing.

Answer:

Much more UV radiation is absorbed and less reaches the Earth. UV levels are higher closer to the equator. Closer to the equator the sun's rays have a shorter distance to travel through the atmosphere and therefore less of the harmful UV radiation can be absorbed.

Explanation: Hope it helps you :)))))

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Answer:

720

Explanation:

240x3=720

Answer:

D. Strong nuclear forces hold the nucleus of an atom together. Weak nuclear forces are involved when certain types of atoms break down.

Explanation:

Answer:

True, the total amount of mechanical energy is merely the sum of the potential energy and the kinetic energy. This sum is simply referred to as the total mechanical energy.

Explanation: Hope it helps you:))))

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Explanation:

To be honest, it depends how far away the object is. half of 2 is 1, half of 1000000 is 500000 soo, but I would say doubling the mass.

Answer: 100,000 Pa

Explanation:

[tex]$$Applied Force $=200 \mathrm{~N}$ \\Area $=0.002 \mathrm{~m}^{2}$\\\\Pressure $=\frac{\text { Force }}{\text { Area }}$\\$=\frac{200}{0.002}$\\$=\frac{200}{2 \times 10^{-3}}$\\$=100,000 \mathrm{~Pa}$[/tex]

Answer:

As we know,

work = 77 N × 1.5m

therefore 115.5 J work was done

Answer:

Hope this helps!

Explanation:

The seeds are removed for two reasons:

- You cannot spin cotton into a yarn if there are seeds still in the cotton.

- The seeds are a very valuable component of cotton and have a variety of uses.

Answer:

True

Explanation:

hope it will help you

Answer:

b

Explanation:

Answer:

4.9

Explanation:

Velocity half second before maximum height = Velocity half second after maximum height (Return journey)

For downward journey :

Initial velocity u=0 m/s

We have g=9.8 m/s

Time t= ½s

s

Thus velocity after half second v=u+gt

v=0+9.8× ½ =4.9m/s

He can increase the total energy of the system by spinning the top faster.

The term energy refers to the ability to do work. The total energy of the system refers to the gravitational potential energy and the rotational energy of the  top.

Hence, he can increase the total energy of the system by spinning the top faster.

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Answer:

See below

Explanation:

F = ma

  = 85 * 9.8 = 833 N

OR this could be written as 187.4 pounds

    OR   187 kg-weight     (not just kg)

85 kg is a measure of MASS, but is often (though improperly) used as weight on earth.

The power dissipated by the LED is 20 Watts and the work done for 1 hour 15 minutes is 56.25 kJ.

Electrical power is the rate at which electrical work is done.

The LED is 75% efficient means that 75% of power dissipated by the LED is converted to light.

Total power dissipated = 5 × 2.5 = 12.5 Watts

Work done = 12.5 × (1 × 3600 + 15 × 60)

Work done = 56250 J = 56.25 kJ

Therefore, the power dissipated by the LED is 20 Watts and the work done for 1 hour 15 minutes is 56.25 kJ.

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Answer:

5875yuguggjgefutfhyds

Explanation:

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The dispersive power of the material of the prism is independent of the shape, angle of prism or size of the prism. It depends only on the refractive index [tex]{(\mu)}[/tex] of the material of the prism.

Answer:

We can see that the angular dispersion of a prism is dependent on the angle of the prism but dispersive power does not depend on the geometry of the prism.

Voltage is always twice the amount of power. This is statement is accurately describe the relationship between voltage and electric power.

Power is defined as amount of energy transferred or converted per unit time.

From power-current relation

P=VI

Also, From Ohm's Law we know that,

V= IR

Replacing the value of V in the above equation,

[tex]P =\frac{I^{2} }{R}[/tex]

When the values for current and resistance are given then the equation is,

[tex]P =\frac{V^{2} }{R}[/tex]

Hence , Voltage is twice to the electric Power.

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Answer:

All of the above

Explanation:

hope it helps you

Answer: 1600 km from the surface

Explanation:

[tex]E = \frac{GM}{R^{2} }\\g1 = \frac{GM}{R1^{2} } \\R1 = 6400 km\\g2 = 0.64g1\\\frac{g1}{g2} = \frac{\frac{GM}{R1^{2} } }{\frac{GM}{R2^{2} } } \\\frac{g1}{0.64g1} = \frac{R2^{2}}{R1^{2} }\\\frac{1}{0.64} = \frac{R2^{2}}{6400^{2} }\\\\\frac{1}{0.8} = \frac{R2}{6400}\\\\R2 = \frac{6400}{0.8}\\R2 = 8000 km\\[/tex]

Therefore, 8000 km - 6400 km = 1600 km from the surface

If the weight of the metal disk is 1.0 N, the normal force acting on the metal disk is also 1.0 N but acting in the opposite direction.

According to Newton Law, action and reaction are equal and opposite. The reaction force is equal in magnitude to the weight of an object but opposite in direction.

Having said that, if the weight of the metal disk is 1.0 N, the normal force acting on the metal disk is also 1.0 N but acting in the opposite direction.

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One problem with digital data is that it can be vulnerable to hackers. A Hacker is a person who gains unauthorized access to digital data. Thus, Option C is the correct answer.

The word Hacker usually refers to a person who will uses computer to access individually to overcome the technical issues. Not only technical problem some person also use the computer to involve in the unauthorized  data for the process of criminal behaviors.

They will make the data or information to get deleted and also steal or change the data in an unauthorized way.

Thus, if there was a problem with digital data is that it can be vulnerable then a person who gains unauthorized access to digital data is known as Hacker.

So, Option C is the correct answer.

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Answer:

O C. A person who gains unauthorized access to digital data

Explanation:

The speed of the cart after 3 seconds of Low fan speed is (2) cm/s. This is further explained below.

Generally, speed is simply defined as the rapidity of movement or efficiency of operation.

In conclusion, After 8 seconds with the fan set at Low, the cart will have traveled 1 cm/s. After three seconds at medium fan speed, the cart travels at a velocity of two centimeters per second.

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Answer:

The contribution of the wavelets lying on the back of the wave front is zero because of something known as the Obliquity Factor. It is assumed that the amplitude of the secondary wavelets is not independent of the direction of propagation, Sources: byju's.com

According to the Voigt and Kirchhoff's law for wavelets, the contribution of a wavelet in any direction making an angle x with the normal to the wavelet is proportional to {1+cos(x)/2)}

For wavelet lying on the back of secondary wavefront,

→ So, the proportional factor:

→ {1+cos(180°)/2}

→ (1-1/2)

→ (0/2)

→ 0

That's why the contribution of the wavelets lying on the back of secondary wave front is zero

From the calculation , we can see that the specific heat capacity is 513 kJ

The specific heat capacity is the heat that can be able to raise the temperature of 1 Kg of a material by 1K.

Now;

We know that;

Latent heat of evaporation = 855kJ/kg

Mass of the liquid = 0.60kg

H = mL

H = 0.60kg * 855kJ/kg

H = 513 kJ

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Answer:

411.84 kg m/s

Explanation:

Formula :

Momentum = mass × velocity

=========================================================

Given :

⇒ mass = 26.4 kg

⇒ velocity = 15.6 m/s

=========================================================

Solving :

⇒ Momentum = 26.4 × 15.6

⇒ Momentum = 411.84 kg m/s

Answer:

Mitosis

Explanation:

Mitosis is a process of nuclear division in eukaryotic cells that occurs when a parent cell divides to produce two identical daughter cells. During cell division, mitosis refers specifically to the separation of the duplicated genetic material carried in the nucleus.