PHYSICS HIGH SCHOOL

BAlpha Centauri has an apparent magnitude of -0.27, whereas the apparent
magnitude of Alpha Crucis is 0.77. Identify which star appears brighter when observed from
Earth. Explain your answer.

Answers

Answer 1
Answer:

Answer:

Alpha centauri will be brighter than Alpha Crucis .

Explanation:

Apparent magnitude of a star measures how bright a star is .

This scale is reverse logarithmic ie , the brighter  the  star , the lower is its magnitude . A magnitude equal to 5 scale higher represents less magnitude by a factor of 1/ 100 . In this way a difference of 1 magnitude represents a brightness ratio of 2.512 . Hence a star of brightness magnitude of 7 is less bright by a factor 2.512  than that of a star magnitude of 6 .

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A frictionless, massless pulley is attached to the ceiling, in a gravity field of 9.81 m/s2. Mass M2 is greater than mass m1. The quantities Tn and g are magnitudes.a.The center of mass accelerates.b.T1 is ..... M1g.c. T3 is ..... m1g + M2gd.T1 is ..... T2e.The magnitude of the acceleration of M2 is ..... the magnitude of the acceleration on m1.f. T1 + T2 is ..... T3

Which of the following best explains why most chemical reactions proceed more quickly when the concentrations of reactants are increased?a. The increased concentration increases the number of collisions between molecules.
b. The products of chemical reactions are more stable at higher concentrations.
c. At higher concentrations, reactant molecules move more quickly.
d. At higher concentrations, product molecules are able to catalyze the reaction.

Answers

A. 
Because you increase the concentration of the reactants, it means that there are more molecules of the reactants present in a smaller amount of space.

This being the case, there is a higher chance that these molecules will collide with enough energy to overcome the activation barrier.

The other ones are completely wrong, but if you would like an explanation as to why they are, just ask :)

Answer:

The increased concentration increases the number of collisions between molecules.

Explanation:

I just took the test. Flvs

A cart is loaded with a brick and pulled at a constant speed along an inclined plane the the height of a seattop. If the mass of the loaded cart is 3.0 kg and the height of the seat top is 0.45 meters, then what is the potential energy of the loaded cart at the height of the seattop?

Answers

gravitational potential energy = mass (kg) x gravitational field strength (N/kg) x height (m)

Therefore, 

3 x 0.45 x 10 = 13.5J <- it's joules because it's energy

Which model of the atom has electrons traveling in specific paths around the nucleus? Bohr's model Rutherford's model Thomson's model Dalton's model

Answers

The model of the atom that has electrons traveling in specific paths around the nucleus is Rutherford's model.

Therefore, the correct answer is option B

J. J Thomson proposed that the atom is a sphere of positively charged matter in which negatively charged electron are embedded.

In Rutherford's model of atomic structure, the electrons moves in orbits by electrostatic attraction to the positively charged nucleus.

According to Dalton's atomic theory, atom were indestructible and indivisible  solid particle.

Bohr's model made assumption that electron can only exist in circular orbits of definite quantum energy.  

According to the question, the model of the atom that has electrons traveling in specific paths around the nucleus is Rutherford's model.

Therefore, the correct answer is option B

Learn more here : brainly.com/question/16776207

Answer:

A, Bohr's model

Explanation:

Took the quiz, hope it's right for you.

(The other three did have something to do with it they just didn't create that specific model)

A 1.00 l sample of a gas at 25.0◦c and 1.00 atm contains 50.0 % helium and 50.0 % neon by mass. what is the partial pressure of the neon. express your answer in atmospheres.

Answers

V = Volume of sample of gas = 1.00 L = 0.001 m³

T = temperature of the gas = 25.0 ⁰C = 25 + 273 = 298 K

P = pressure = 1.00 atm = 101325 Pa

n = number of moles of gas

using ideal gas equation

PV = n RT

101325 (0.001) = n (8.314) (298)

n = 0.041

n₁ = number of moles of helium

n₂ = number of moles of neon

m₁ = mass of helium = n₁ (4) = 4 n₁

m₂ = mass of neon = n₂ (20.2) = 20.2 n₂

given that :

m₁ = m₂

4 n₁ = 20.2 n₂

n₁ = 5.05 n₂

also

n₁ +  n₂ = n

5.05 n₂ +  n₂ = 0.041

n₂ = 0.0068

mole fraction of neon is given as

mole fraction = n₂ /n = 0.0068/0.041 = 0.166

P₂ = partial pressure of neon = (mole fraction) P

P₂ = (0.166) (1)

P₂ = 0.166 atm

The partial pressure of the neon is  0.16 atm.

Explanation:  

 A 1.00 l sample of a gas at 25.0◦c and 1.00 atm contains 50.0 % helium and 50.0 % neon by mass. what is the partial pressure of the neon. express your answer in atmospheres.

The partial pressure is the notional pressure of constituent gas if it is occupied alone by the entire volume of the original mixture at the same temperature.

50.0 % helium and 50.0 % neon by mass.

P = 1 atm

Mass of the gases = M

Moles of helium = (0.5M)/(4 g/mol)\nMoles of neon = (0.5M)/(20 g/mol)

By using ideal gas equation we get:

PV=nRT\nn=(PV)/(RT)=(1.00 L* 1.00 atm)/(0.0820 L atm/mol K* 298 K)=0.0409 mol

where n =total number of moles of gases

0.0409 mol=(0.5M)/(4 g/mol)+(0.5M)/(20 g/mol)

M = 0.2728 g

Then we can find the mass and mole of gases

The gas molar volume is the volume of one mole of the gas at a given temperature and pressure.

Mass of helium gas = (0.2728g)/(2)=0.1364 g

Moles of helium gas =n_1=(0.1364 g)/(4 g/mol)=0.0341 mole

Mass of neon gas  = (0.2728g)/(2)=0.1364 g

Moles of neon gas = n_2=(0.1364 g)/(20 g/mol)=0.00682mole

Partial pressure of the neon gas:P* \chi_2=P* (n_2)/(n_1+n_2)=1 atm* (0.00682)/(0.00682+0.0341)=0.16 atm

Therefore the partial pressure of the neon gas is 0.16 atm.

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Iron has a mass of 7.87 g per cubic centimeter of volume, and the mass of an iron atom is 9.27 × 10-26 kg. If you simplify and treat each atom as a cube, (a) what is the average volume (in cubic meters) required for each iron atom and (b) what is the distance (in meters) between the centers of adjacent atoms?

Answers

known values; mass per / volume and mass of each atom 

average volume= volume per atom. 
density*mass per atom = volume per atom 

1cm^3 / 7.87 gram * 9.27 *10^-26 kg /atom* 1000 gram / kg=
=1.178 * 10^-22 cm^3 per atom 

Convert that to mass 
1 cm^3 * (1 m / 100 cm)^3 
 average volume= 1.178 *10^-29 m^3 per  atom 

distance: 

Volume of a cube is L^3 


so L = (1.178*10^-29)^(1/3) 

Half way through the cube is distance 1/2 L. 
Second cube is 1/2 L 
So distance between the center of 2 cubes = L 

=2.28 *10^-10 m 

A stone falls from a ledge and takes 8 seconds to hit the ground. The stone has an original velocity of 0 m/s. How tall is the ledge? A. 313.6 meters B. 78.4 meters C. 39.2 meters D. 1,254.4 meters

Answers

The right answer for the question that is being asked and shown above is that: "D. 1,254.4 meters." A stone falls from a ledge and takes 8 seconds to hit the ground. The stone has an original velocity of 0 m/s. The ledge has the height of D. 1,254.4 meters

By the way, on the Penn Foster test, C. 1,254.4 meters is incorrect.
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