What is similarity?

The energy source of a protostar is gravitational contraction. This gravitational contraction is what makes it possible for the protostar to become a fully-fledged star, and it is the reason why protostars are so hot and bright when they first form.

A protostar is a dense cloud of gas and dust that forms from the gravitational collapse of a molecular cloud. As the protostar collapses under the force of its own gravity, it becomes denser and hotter, eventually reaching a temperature and pressure at which nuclear fusion can occur in the core. The energy source of a protostar is gravitational contraction.

When a protostar is first formed, it is very large and diffuse, with a low density and a low temperature. However, as it continues to collapse under the force of gravity, it becomes denser and hotter, eventually reaching a temperature and pressure at which nuclear fusion can occur in the core. Nuclear fusion in the core is what powers a fully-fledged star, but before this can happen, the protostar must first collapse enough to trigger this process.

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Answer:

distance divided by time is the speed. Your welcome

Speed= distance/time. So, the net velocity of the plane is 25kmph.

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A hallmark of courage is being ready and willing to face challenging or uncomfortable circumstances. The word "bravery" is similar. It can also include doing so, even though confronting these situations fearlessly is generally thought of as showing courage.

In reality, courage is the capacity to move forward in the face of fear. The ability to behave bravely in the face of any anxiety or tension is what is meant by having courage. One of the finest ways to be courageous is to recognize your fears and then decide not to let them stop you. having the guts to handle risk in a responsible manner as opposed to acting cowardly or irrationally confident.

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Answer:

Thermosphere A,B

Mesosphere B,C,D

Stratosphere D,E,F

Troposphere G

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Answer:

-35 \(m/s^2\)

Explanation:

Deceleration is the complete opposite of acceleration and is calculated by adding a negative sign to the formula for finding acceleration.

Since acceleration is calculated by diving the change in velocity with time, deceleration will become:

 Deceleration =   -Δv/t, where Δv = change in velocity and t = time

In this case, Δv = 70 m/s and t = 2 s, hence;

Deceleration = -70/2 = -35 \(m/s^2\)

The deceleration is 35 \(m/s^2\).

Lifting the heavy box from the ground to the shelf requires the greatest power output from the fork lift truck.

The power output required to lift a heavy box with a fork lift truck is directly proportional to the weight of the box and the height it needs to be lifted. When lifting the box from the ground to the shelf, the full weight of the box must be lifted to the desired height, which requires the greatest power output.

The power output of the fork lift truck includes the energy used to overcome the force of gravity and the resistance of the air, as well as the energy used to overcome friction and other mechanical losses. The greater the weight of the box and the height it needs to be lifted, the greater the power output required from the fork lift truck.

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Answer:

sill 100?

Explanation:

Answer:25km/s

Explanation:

The planet's orbital speed is higher when the planet is nearest to the sun.

The planet's orbital speed increases when it is nearest to the sun because of the strong gravitational force of the sun. A planet's orbital speed depends on the distance from the sun. The closer a planet is to the Sun, the stronger the Sun's gravitational pull on it, and the faster the planet moves.

The farther it is from the Sun, the weaker the Sun's gravitational pull on the planet so it moves slower in its orbit around the sun so we can conclude that the planet's orbital speed is higher when the planet is nearest to the sun.

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A hydrogen atom is in its ground state (nᵢ = 1) when a photon impinges upon it. The atom absorbs the photon, which has precisely the energy required to raise the atom to the nf = 3 state. (a) The photon's energy that was absorbed is approximately 1.51 eV (negative sign indicates absorption).(b)option B and C are correct.

To determine the photon's energy and the energies of photons that might be emitted when the hydrogen atom returns to the ground state, we can use the energy level formula for hydrogen atoms:

E = -13.6 eV / n^2

where E is the energy of the electron in the atom, and n is the principal quantum number.

(a) To find the energy of the photon that was absorbed by the hydrogen atom to raise it from the ground state (nᵢ = 1) to the nf = 3 state, we need to calculate the energy difference between the two states:

ΔE = Ef - Ei = (-13.6 eV / 3^2) - (-13.6 eV / 1^2)

Calculating the value of ΔE:

ΔE = -13.6 eV / 9 + 13.6 eV

= -1.51 eV

Therefore, the photon's energy that was absorbed is approximately 1.51 eV (negative sign indicates absorption).

(b) When the hydrogen atom returns to the ground state, it can emit photons with energies corresponding to the energy differences between the excited states and the ground state. We need to calculate these energy differences and check which values are present among the given options.

ΔE1 = (-13.6 eV / 1^2) - (-13.6 eV / 3^2) = 10.20 eV

ΔE2 = (-13.6 eV / 1^2) - (-13.6 eV / 4^2) = 10.20 eV

ΔE3 = (-13.6 eV / 1^2) - (-13.6 eV / 5^2) = 12.10 eV

ΔE4 = (-13.6 eV / 1^2) - (-13.6 eV / 6^2) = 12.10 eV

ΔE5 = (-13.6 eV / 1^2) - (-13.6 eV / 7^2) = 13.55 eV

ΔE6 = (-13.6 eV / 1^2) - (-13.6 eV / 8^2) = 13.55 eV

ΔE7 = (-13.6 eV / 1^2) - (-13.6 eV / 9^2) = 13.55 eV

Comparing the calculated energy differences with the given options:

(A) 1.89 eV: This energy difference does not match any of the calculated values.

(B) 12.1 eV: This energy difference matches ΔE3 and ΔE4.

(C) 10.2 eV: This energy difference matches ΔE1 and ΔE2.

(D) 13.6 eV: This energy difference does not match any of the calculated values.

Therefore option B and C are correct.

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Answer:

A composite wave

Answer:

surface waves

Explanation:

Answer:

The final speed is 75 m/s

Explanation:

Constant Acceleration Motion

It's a type of motion in which the velocity of an object changes uniformly in time.

Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the following relation applies:

\(v_f=v_o+at\)

The airplane comes from rest (vo=0) accelerating at a=25 m/s^2 for t=3 s.

The final speed is:

\(v_f=0+25~m/s^2\cdot 3~s\)

\(v_f=75~m/s\)

The final speed is 75 m/s

Answer:

Chk photo

Explanation:

The bulb goes out at the beginning of the conductivity test because there is no complete circuit for electricity to flow through.

The conductivity test is a simple experiment used to determine whether a substance is a conductor or an insulator. In this test, a light bulb is connected to a battery through a wire, and the substance being tested is placed between the two ends of the wire. If the substance conducts electricity, the bulb will light up.

At the beginning of the test, the wires are clipped off at the bottom, and the bulb goes out because there is no complete circuit for the electricity to flow through. When the wires are clipped to the substance being tested, if the substance is a good conductor, it will allow the flow of electricity through it, completing the circuit and causing the bulb to light up. However, if the substance is an insulator, it will not allow electricity to pass through it, and the bulb will remain unlit.

Thus, the bulb goes out at the beginning of the conductivity test because there is no complete circuit for electricity to flow through. It is only when the wires are clipped to the substance being tested that a circuit can be completed, and the bulb will light up if the substance is a good conductor.

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When a significant portion of potential energy is not converted into kinetic energy, the unconverted energy is typically transformed into other forms of energy or lost in the process.

The unconverted energy is often converted into other kinds of energy or lost during the process when a sizable amount of potential energy is not turned into kinetic energy. Here are a few possibilities:

1. Thermal Energy: The potential energy might have been converted into thermal energy, also known as heat. This occurs when there is friction or other dissipative forces present in the system. The energy is dissipated as heat, increasing the temperature of the system or the surrounding environment.

2. Sound Energy: In some cases, the unconverted energy may be transformed into sound energy. If there are vibrations or oscillations involved in the process, the energy not converted into kinetic energy can be radiated as sound waves.

3. Vibrational or Elastic Energy: If the system contains objects or materials with elastic properties, the unconverted energy could be stored as vibrational or elastic energy within those objects. This can happen in situations where the potential energy is stored in springs, elastic materials, or vibrating structures.

4. Work Done on Other Objects: The unconverted potential energy may be used to perform work on other objects or systems within the environment. For example, if the potential energy is stored in a compressed gas or a compressed fluid, it can be utilized to do work on other objects or to drive a mechanical process.

5. Energy Losses: In some cases, the unconverted energy may be lost due to inefficiencies in the system or other factors. These losses can occur due to factors like friction, air resistance, electrical resistance, or other forms of energy dissipation.

It's important to note that energy is conserved according to the law of conservation of energy. Even if a significant portion of potential energy is not converted into kinetic energy, the total amount of energy in the system (including potential, kinetic, thermal, and other forms) remains constant. The unconverted energy is simply transformed or lost in other ways.

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Answer: 115 N

Explanation:

In this case, the ball has a weight of 15 N (force due to gravity) acting on it and the cannon is shooting it with a force of 100 N.

To find the net force on the ball, we add the forces acting on it.

Net force = force due to gravity + force due to the cannon

Net force = 15 N + 100 N

Net force = 115 N

So, the net force on the ball will be 115 N. ✅

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Answer:

lm.ao i was stuck too when i was on that

Explanation:

what u need to know sis?

speed, being a scalar quantity, is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. Speed is ignorant of direction. On the other hand, velocity is a vector quantity; it is direction-aware. Velocity is the rate at which the position changes.

Answer:

waves

Explanation:

The correct word that completes the statement is that radiation transfers thermal energy in the form of waves. So, option A is correct.

Radiation is the movement of atomic and subatomic atoms as well as waves, like those that define X-rays, heat rays, and light rays. Radiation of both types, from cosmic and earthly sources, is constantly being thrown at all matter. The qualities and behavior of radiation, as well as the matter it interacts with, are outlined in this article, which also explains how energy is transmitted from radiation to its environment.

The effects of such an energy conversion to living things are given a lot of consideration, including how many aspects of life—such as photosynthesis in plants and sight in animals—are affected normally as well as any abnormal or harmful effects that may arise from exposing organisms to radiation of unusual types or to radiation doses that are higher than those found in nature.

Therefore, in radiation, the energy transfer through waves.

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Answer:

Option C is the correct statement.

Explanation:

Both coal-fired power plants and solar thermal power plants use a heat source to create steam, which then drives a turbine to generate electricity. In a coal-fired power plant, the heat is generated by burning coal to produce steam. In a solar thermal power plant, mirrors or lenses are used to concentrate sunlight onto a fluid, which is then heated to produce steam.

Option A is incorrect because coal is a non-renewable resource, while solar thermal power plants utilize renewable solar energy. Option B is incorrect because the conversion efficiency of coal-fired power plants is typically much lower than that of solar thermal power plants. Option D is partially correct, as coal-fired power plants are a major source of greenhouse gas emissions, while solar thermal power plants do not emit greenhouse gases during operation.

Some people may give up their rights out of fear or trepidation. However, you must recognize that using your rights is a kind of self-defense, not a challenge to the police.

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Answer:

Explanation:

A simple pendulum consists of a mass (usually represented as a small object or bob) attached to a string or rod of negligible mass. The mass is free to swing back and forth under the influence of gravity.

In the figure, the point of suspension is denoted by "O," and the mass (bob) is represented by the small circle. The string or rod is represented by the vertical line connecting the point of suspension to the bob.

Amplitude:

The amplitude of a pendulum refers to the maximum displacement or swing of the bob from its equilibrium position. In the figure, the amplitude can be represented by the angle formed between the vertical position and the position of the bob when it swings to its maximum distance on one side. It is usually denoted by the symbol "A."

Effective Length:

The effective length of a pendulum refers to the distance from the point of suspension to the center of mass of the bob. It represents the distance over which the mass swings back and forth. In the figure, the effective length can be measured as the length of the string or rod from the point of suspension to the center of the bob. It is usually denoted by the symbol "L."

It is important to note that the amplitude and effective length of a simple pendulum affect its period of oscillation (the time taken for one complete swing). The relationship between these parameters and the period can be described by mathematical formulas.

Overall, the simple pendulum is a fundamental concept in physics and provides a simplified model for understanding oscillatory motion and the principles of periodic motion.

Answer:

99kg m/s

Explanation:

\(p=m\Delta v \\\\\Delta v=20-0.20=19.8m/s \\\\p=5(19.8)=99\)

Hope this helps!

Answer:

Solution,

Initial speed(u)=20 m/s

final speed(v)=0.20 m/s

change in momentum∆P=m(v-u)

∆P=5(0.20-20)

∆P=5*19.8

∆P=99 kg m/s

Momentum of the body is decreased by 99 kg m/s

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Good luck on your assignment...

Answer:

B

Explanation:

Answer:

Heat capacity is the ratio of the amount of heat energy transferred to an object to the resulting increase in its temperature. Molar heat capacity is a measure of the amount of heat necessary to raise the temperature of one mole of a pure substance by one degree K.

Explanation:

hope this helps <3

The velocity of an object includes direction of the motion of an object whereas speed does not include direction. Thus, the correct options for 1, 2, 3, 4, and 5 are B, B, A, A, and B, respectively.

Velocity can be defined as the directional speed of an object in the motion as an indication of the rate of change in the position of an object as observed from a particular frame of reference by the observer and as measured by a particular standard of time.

The velocity is different from that of speed as it is a vector quantity, the velocity of an object includes direction of the motion of an object whereas speed does not include direction.

Track runners cover same distance however, the winner in the race is the one who covers the particular distance in less time than other competitors.

The slowest runner in the graph is the one represented with blue color. This is because, this runner took maximum time to cover the distance.

The distance covered by the train is 300 miles in time period of 6 hours. Therefore, the speed of the train will be the distance covered by the train divided by the total time taken.

Speed of the train = 300 miles/ 6 hours

Speed of the train = 50 miles per hour.

The example of velocity is the one with the unit of length per time. From the given options, 80 miler per hour is an example of velocity as miles is the unit of length and hour is the unit of time.

Therefore, the correct options for 1, 2, 3, 4, and 5 are B, B, A, A, and B, respectively.

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Answer:

A lens placed in a transparent liquid becomes invisible because when refractive index of the material of the lens is equal to the refractive index of the liquid in which lens is placed under this condition no bending of light takes place when it travels from liquid to the lens, so both will start behaving like both are same things.

Explanation:

hope it helps :))

The velocity of the bowling ball with its putty passenger will be 2.28 m/s.

Velocity of the moving chunk = \(V_{c}\) = 4 m/s

Mass of the chunk = \(M_{c}\) =  8 kg

Mass of the bowling ball =  \(M_{b}\) = 7 kg

Velocity of the bowling ball =  \(V_{b}\) = 0

Since this is the perfect inelastic collision, so according to the law of conservation of momentum

Conservation of momentum is a fundamental law of physics that states that the total momentum of an isolated system is conserved in the absence of an external force.

\(p_{initial} = p_{final}\)

\(p_{initial}\) = \(V_{c}\) *  \(M_{c}\) +   \(M_{b}\) * \(V_{b}\)

\(p_{initial}\) = 8*4 + 7*0

\(p_{initial}\) = 32 + 0

\(p_{initial}\) = 32 kg.m/s

\(p_{final}\) =  ( \(M_{c}\) +  \(M_{b}\) ) \(V_{final}\)

\(p_{final}\)  = ( 8 + 7 ) \(V_{final}\)

\(p_{final}\) = 14  \(V_{final}\) kg.m/s

\(p_{initial} = p_{final}\)

32 = 14   \(V_{final}\)

 \(V_{final}\) = \(\frac{32}{14}\)

 \(V_{final}\) = 2.28 m/s

The bowling ball with its putty passenger will then be set in motion with a velocity of 2.28 m/s.

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Answer:

see the various answers below

Explanation:

From the given details, we can see that we are required to solve for the work done.

1. Mr. Claspell moves 100 N of avocados straight up 2.0 meters.

Work done= Force*Distance

Work done= 100*2= 200Joules

2. The Flash tackles the Reverse-Flash and pushes him 3.0 meters using a force of 200 N.

Work done= Force*Distance

Work done= 200*3= 600Joules

3. Darth Vader moves a large rock using force. That force is 3.0 N and he moves the rock 15 meters.

Work done= Force*Distance

Work done= 3*15= 45Joules

4. Mario carries Princess Peach 45 meters away from Bowser’s Castle with a force of 5.0 N

Work done= Force*Distance

Work done= 5*45= 225Joules

5. A roller coaster car lifts a group of people 50 m to the top of the roller coaster with a force of 550 N.

Work done= Force*Distance

Work done= 550*50=27500Joules or 27.5kJ