Why is there a main sequence? (Select all that apply.) There is a relationship between the luminosity and temperature of hydrogen-burning stars. Hydrogen-burning stars reach an equilibrium between the inward gravitational pull on their atoms and the outward pressure of their hot gases, which are heated by energy produced in nuclear reactions. Hydrogen-burning stars of the same mass come in a wide range of luminosities (with a variation in L/Lalchemist sun symbol on the order of about 104). There is a relationship between the luminosity and mass of hydrogen-burning stars. none of these

Answer: around 65.

Explanation:

You are given a diameter of 10 cm (this is x value). find what y value is equal to at those 10 cm. You’ll see that it’s aroun 65

Atoms will be negatively charged whenever they gain electrons. Attraction of atoms is due to opposite charges of the atoms.

a. Negative

b. Atoms near the wall are positively charged.

This is the phenomenon whereby the carrier of electric charges are not in motion.

The fundamental law of electrostatic state that like charges repel while like charges attract each others.

If you rub an air-filled balloon on your hair, you can make it stick to a wall. when the balloon and your hair are rubbed together, electrons are transferred from your hair to the balloon.

a. The net charge on the balloon after it is rubbed on your hair will therefore be negative because it has gained electron

b. The atoms near the wall's surface are positively charged. When the balloon is brought near the wall, unlike charges will surely attract each other.

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Answer:

The efficiency of the hammer is 72%.

Explanation:

output work/input work x 100%

18J/25J x 100%

0.72 x 100%

72%

Answer:

A -- Correct (what you have on the paper)

B -- (Sphere A - negative 6 ) (Sphere B - negative 6) (Sphere C - positive 9)

(Total - negative 3)

Explanation:

Hope this helps! Please let me know if you need more help, or if you think my answer is incorrect. Brainliest would be MUCH appreciated. Have a wonderful day!

Answer:

Explanation:

a. Total charge = sum of charges of A, B and C

= -4 + -8 + 9

= -3.0C

b. After touching each other, the charges on A and B will equalized. When separated, they have the same charge = (-4 + -8) / 2 = -6.

Charge on C and the total charge will not change.

A : -6.0C

B : -6.0C

C : +9.0C

Total : -3.0C

Answer: stationary front

Explanation:

Answer:

25N

Explanation:

if you calculate it right the answer will be 25

Explanation:

Option B is correct

Answer:

Ffriction = 90 N

coefficient = 0.3

Explanation:

First, note that the sum of all the forces in the x directions equals the mass multiplied by the acceleration in the x direction.

assuming the direction of the pulling force is positive,

243 N - Ffriction = m * a

m= 30.6 kg

a= 5 m/s/s

Ffriction= 243 - m*a

Ffriction= 243 - (30.6)(5)

Ffriction=90 N

The force of friction is equal to the coefficient of friction multiplied by the normal force on the object. Because the pulling force is completely horizontal, the normal force of the object is equal to its weight, which is m * g, or (30.6 kg)(9.8 m/s/s) = 299.88 N

Ffriction = coefficient * Fnormal

90 = coefficient * 299.88

coefficient = 0.3

Answer:

Speedometer. It's in the name.

Answer:

gogo

Explanation:

Answer:

if I understand ur question, you mean does the surface area of solute, temperature of solvent and the amount of particles affect the rate of dissolution?

YES

How? The surface area of the solute is the part that is in contact with the solvent. For this reason granules or powdery substance dissolves better than it lumps.

The temperature of solvent also affects dissolution. For solid solutes, increase in temperature causes solute to disslove better but for gases increase in temperature reduces their solubility

Amount of particles also affect dissolution. A quantity of solvent has limited number of particles it can dissolve. If the particles are more than the solvent can dissolve,the excess particles will precipitate out

Answer:

∆y=30m

Vi=10m/s

a=9.8

Vf=?

(1)Vf²=Vi²+2a∆y

Vf²=(10)²+2(9.8)(30)

Vf²=100+588

Vf²=688

√Vf²=√688

Vf= 26,23

(2) Vf=Vi+a∆t

26,23=10+9,8∆t

16,23=9,8∆t

∆t=1,66 sec

Answer:

A concave lens is thinner at the center and thicker at the edges while a convex lens is thicker at the centre and thinner at the edges.

Answer:

Read below.

Explanation:

Convex lenses: have a thicker centre than their edges. Converges light rays to a point.

Concave lenses: have thicker edges than their centre. Diverges the light rays passing through it.

(a) The angular velocity of the system after the collision is 1.61 rad/s.

(b) The kinetic energy before collision is 19.31 J and the kinetic energy after collision is 1.45 J.

The angular velocity of the system is determined by applying the principle of conservation of angular momentum.

Li = Lf

P x r = Ifωf

mv x r = Ifωf

[tex]\omega _f = \frac{mvr}{I_f} \\\\\omega _f = \frac{mvr}{\frac{1}{3}Mr^2 + mr^2 } \\\\\omega _f = \frac{mvr}{r^2(\frac{1}{3}M + m )}\\\\\omega _f = \frac{mv}{r(\frac{1}{3}M + m )}\\\\\omega _f = \frac{0.055 \times 26.5}{1.2(\frac{2.1}{3} \+ \ 0.055)} \\\\\omega_f = 1.61 \ rad/s[/tex]

Kinetic energy before the collision is calculated as follows;

[tex]K.E_i = K.E_{ball} + K.E _{rod}\\\\K.E_i = K.E_{ball} + 0\\\\K.E_i = \frac{1}{2} \times m \times v^2\\\\K.E_i = \frac{1}{2} \times 0.055 \times 26.5^2\\\\K.E_i = 19.31 \ J[/tex]

The kinetic energy after the collision is calculated as follows;

[tex]K.E_f =\frac{1}{2} I_f \omega_ f^2\\\\K.E_f = \frac{1}{2} (\frac{1}{3}Mr^2 + mr^2)\omega _f^2\\\\K.E_f =\frac{1}{2} [\frac{1}{3}(2.1)(1.2)^2 + (0.055)(1.2)^2]\times (1.61)^2\\\\K.E_f = \frac{1}{2} (1.008 + 0.114) \times (1.61)^2\\\\K.E_f = 1.45 \ J[/tex]

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Answer:

Cable  B will more stretch the most.

Explanation:

Given that,

Length of material A =[tex]l_{A}[/tex]

Length of material B =[tex]l_{B}[/tex]

If A has a greater Young's Modulus than B.

We know that,

The deflection is defined as,

[tex]\delta=\dfrac{Wl}{AE}[/tex]

For material A,

[tex]\delta_{A}=\dfrac{W_{A}l_{A}}{A_{A}E_{A}}[/tex]

[tex]\delta_{A}\propto\dfrac{1}{E_{A}}[/tex]

For material B,

[tex]\delta_{B}=\dfrac{W_{B}l_{B}}{A_{B}E_{B}}[/tex]

[tex]\delta_{B}\propto\dfrac{1}{E_{B}}[/tex]

The deflection is inversely proportional to the young's modulus.

We need to find which cable  will stretch the most when loaded

Using formula of deflection

[tex]\dfrac{\delta_{A}}{\delta_{B}}=\dfrac{\dfrac{W_{A}l_{A}}{A_{A}E_{A}}}{\dfrac{W_{B}l_{B}}{A_{B}E_{B}}}[/tex]

Put the value into the formula

[tex]\dfrac{\delta_{A}}{\delta_{B}}=\dfrac{\dfrac{Wl}{AE_{A}}}{\dfrac{Wl}{AE_{B}}}[/tex]

[tex]\dfrac{\delta_{A}}{\delta_{B}}=\dfrac{E_{B}}{E_{A}}[/tex]

So, [tex]\delta_{B}>\delta_{A}[/tex]

Hence, Cable  B will more stretch the most.

The composition of the sun by mass of hydrogen drops, but the amount of helium grows because helium is heavier than hydrogen.

The percentage by mass of an element in a compound is the percentage the mass of that element contributes to the total mass of the substance.

The percentage by mass of an element depends on the mass of the element.

Heavier elements in equal amounts with less dense elements have a greater percentage mass.

Since the mass of the helium atom is greater than the mass of the hydrogen atom, the Sun's composition by mass of hydrogen drops while that of helium increases.

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The amplitude, restoring force and speed of an object undergoing simple harmonic  motion may have maximum magnitudes at the same instant of time.

Simple harmonic motion is a regular repeating motion. The acceleration of a simple harmonic motion is always directed towards the center of the motion.

There are three  quantities related to the object that can have maximum values at the same time and these are;

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Answer: 17 hours

Explanation:

Answer:

348

Explanation:

because maths ;)

The box of macaroni are in the shape of a cuboid, and the volume of the cuboid in the same unit will be 348 cm.

A three-dimensional space's volume can be calculated.  It is frequently expressed in numerical form using SI-derived units or by different imperial units (such as the gallon, quart, and cubic inch). Volume and length are related by the definition of length (cubed). In contrast to how much space the container occupies, the volume of a container is typically thought of as its carrying capacity or the amount of fluid (liquid or gas) that it could hold.

According to the question, the given values are :

Length, l = 16 cm

Width, b = 7.5 cm

Height, h = 2.9 cm

So, the volume of the Cuboid will be, V : l × b × h

V = 16 × 7.5 × 2.9

V = 348 cm³.

Hence, the volume of macaroni box will be 348 cm³.

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Answer:

The Sun has a north and south pole, just as the Earth does, and rotates on its axis. However, unlike Earth which rotates at all latitudes every 24 hours, the Sun rotates every 25 days at the equator and takes progressively longer to rotate at higher latitudes, up to 35 days at the poles. This is known as differential rotation.

Explanation:

Other characteristics that Nima can share with her students are as follows:

Visible light is one of the components of the electromagnetic spectrum (EM). It is the only part of the EM spectrum that is visible to human eyes.

According to this question, Nima has already shared this characteristics of visible light with her student.

Other characteristics that Nima can share with her students are as follows:

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Answer:

While maintaining a successful medical practice, Gilbert carried out extensive research into electricity and magnetism. Very little about these phenomena was understood when he began his experiments. The basic magnetic properties of lodestone (magnetic iron ore) were familiar, the magnetic compass had been in use for some time by navigators, and the amber effect (now called the triboelectric effect), by which amber and certain other materials acquire a static charge via friction, was generally known. But no one could adequately explain how or why such things worked. Gilbert’s investigations led him to develop a number of his own theories.

Explanation:

Answer:

Boiling Point

Explanation:

When a liquid changes to a gas is called the boiling point.