PHYSICS
HIGH SCHOOL

Answer:

Answer:

Niels Bohr was a Danish physicist who contributed to the understanding of the atom and quantum mechanics. He was awarded the Nobel Prize in Physics in 1922.

Based on the theories of Ernest Rutherford, he published his own atomic model (Bohr's atomic model) in 1913, introducing the theory of quantized orbits, which in quantum mechanical theory consists of the characteristics that, around the Atomic nucleus, the number of electrons in each orbit increases from the inside to the outside.

In his model, in addition, the electrons could fall (to go from one orbit to another) from an outer orbital to an inner one, emitting a photon of discrete energy, fact on which quantum mechanics is based.

In 1922 he received the Nobel Prize in Physics for his work on atomic structure and radiation.

Answer: That the hydrogen atom was based on the Quantum theory

HIGH SCHOOL

In a ballistics test, a 1.50-g bullet is fired through a 28.0-kg block traveling horizontally toward the bullet. In this test, the bullet takes 11.4 ms to pass through the block as it reverses the block's velocity from 1.75 m/s to the right to 1.20 m/s to the left with constant acceleration. Find the magnitude of the force that the bullet exerts on the block during this ballistics test.

By newtons 3rd law of motion

Rate of change in momentum of the bullet = Rate of change in momentum of the block

ForceBullet=Forceblock

Force∙=mblock∗(vfinal−vinitial)/t

ForceBullet=28(1.20−(−1.75)/11.4×10−3

Rate of change in momentum of the bullet = Rate of change in momentum of the block

ForceBullet=Forceblock

Force∙=mblock∗(vfinal−vinitial)/t

ForceBullet=28(1.20−(−1.75)/11.4×10−3

HIGH SCHOOL

The decomposition a → b + c of a molecule a obeys the rate-law expression rate = 0.080 min−1 [a]. if the initial concentration of a is 0.30 m, what is the concentration after 2.6 minutes? 1. 0.028 m 2. 0.24 m 3. 0.38 m 4. 0.13 m 5. 0.32 m 0

The correct option from given choices is 2, that is 0.24 m

We can find this by using the following formula;

ln A = ln Ao - kt

Ao = 0.30

k = 0.080 min⁻¹

t = 2..6 min

ln A = ln 0.30 - (0.080 min⁻¹) (2.6 min)

ln A = -1.412

A = 0.24 m

We can find this by using the following formula;

ln A = ln Ao - kt

Ao = 0.30

k = 0.080 min⁻¹

t = 2..6 min

ln A = ln 0.30 - (0.080 min⁻¹) (2.6 min)

ln A = -1.412

A = 0.24 m

HIGH SCHOOL

Which of these models of the solar system first proved that the sun is at the center of the solar system? Ptolemy's geocentric model

Brahe view of the solar system

Kepler view of the solar system

Copernicus' heliocentric model

I think the answer is C-Kepler, because of the word "proved" in the question.

This is why, "Kepler used the meticulous notes and data gathered by Brahe to make discoveries about the motion of the planets. Kepler’s work proved Copernicus’s view that the solar system was heliocentric.".

Can someone confirm my thinking? Hate tricky questions :)

Answer:

Copernicus' heliocentric model

Explanation:

Nicolaus Copernicus was the first one to give the heliocentric model of the solar system. The heliocentric model of the solar system describes the sun to be at the center of the solar system and earth and other planets with their moons revolving about it in concentric orbits.

Kepler believed in Copernicus's heliocentric model but gave laws of planetary motion that described the orbit of the planets to be elliptical instead of circular.

Tycho Brahe view of the solar system was that sun revolved around earth but other planets revolved around the sun.

Ptolemy's geocentric model considered earth to be the center of the universe and sun and other planets revolving about it.

I believe it was Copernicus' heliocentric model.

heliocentric - the sun is at the center and the planets revolve around it.

hope this helps :)

heliocentric - the sun is at the center and the planets revolve around it.

hope this helps :)

HIGH SCHOOL

A car starting from rest covers a displacement of 200m over a time interval of 10 seconds. Find the acceleration of the car

Multiply 200x10 then you will have your answer

HIGH SCHOOL

If object A has more mass than object B, does object A contain more matter? Explain why it is so.

Mass is a unit of measurement that is concern about the amount of substance present in the body. Because substance A has more mass than Substance B, then it clearly contains more matter than B. So, the answer to the question is YES.

COLLEGE

A 0.412 kg metal cylinder is placed inside the top of a plastic tube, the lower end of which is sealed off by an adjustable plunger. The cylinder comes to rest some distance above the plunger. The plastic tube has an inner radius of 7.41 mm and is frictionless. Neither the plunger nor the metal cylinder allow any air to flow around them. If the plunger is suddenly pushed upwards, increasing the pressure between the plunger and the metal cylinder by a factor of 2.55 , what is the initial acceleration a of the metal cylinder? Assume the pressure outside of the tube is 1.00 atm .

Answer:

108.18 m/s2

Explanation:

1 atm = 101325 Pa

r = 7.41 mm = 0.00741m

Since the pressure is increased by a factor of 2.55, the new inner pressure inside the system would be

P = 101325 * 2.55 = 258378.75 Pa

This pressure exerts a force on the metal cylinder, knowing the radius, we can calculate the cross-section area:

Then the force exerted:

Finally we can calculate the initial acceleration in accordance with Newton's 2nd law of motion:

HIGH SCHOOL

A sudden discharge of static electricity during a thunderstorm is called

Hello

It is called lightning. Lightning in a storm occurs when there are two regions (it can be cloud-cloud or cloud-ground), one with a strong excess of positive charges and the other one with a strong excess of negative charges. The two types of charge attract each other, and then a sudden flow of charges from one region to the other occurs, which is called lightning.

It is called lightning. Lightning in a storm occurs when there are two regions (it can be cloud-cloud or cloud-ground), one with a strong excess of positive charges and the other one with a strong excess of negative charges. The two types of charge attract each other, and then a sudden flow of charges from one region to the other occurs, which is called lightning.

MIDDLE SCHOOL

The state of matter that keeps its shape and volume when it is placed in different containers

A solid is the only state of matter that keeps it shape and volume when placed in different containments

HIGH SCHOOL

Find the impedance of the load for maximum power transfer in the attached circuit.

I can't find the attached circuit.

Maximum power transfer occurs when the load impedance

is equal to the internal impedance of the power source.

Maximum power transfer occurs when the load impedance

is equal to the internal impedance of the power source.