if quasars often resemble little blue stars, what was it about them that so surprised astronomers when they were discovered?

Answer:C.3

Explanation:

Cloud spins faster due to conservation of angular momentum and not due to the conversion of gravitational potential energy is to kinetic energy.

Conservation of angular momentum states that the total angular momentum of a closed system remains constant over time, so as the cloud spins faster, the angular momentum must remain the same, meaning that the angular velocity must increase. On the other hand, gravitational potential energy is converted to kinetic energy. Gravitational potential energy is energy stored in an object due to its position in a gravitational field, and this energy is converted to kinetic energy as the object moves.

To know more about angular momentum please refer:

https://brainly.com/question/29897173

#SPJ4

Answer:

FALSE

Explanation:

Answer:

Hi... Potential energy is converted to kinetic energy and kinetic energy is converted to potential energy

The bicyclist's acceleration is 2.7 m/s². Thus, Option C is the answer

Acceleration is defined as rate of change of velocity with time. Its formula is

a= \(\frac{vf - vi}{t}\)

acceleration = (final velocity - initial velocity) / time

The bicyclist's acceleration can be found using this equation:

In this case,

final velocity = 12.15 m/s

initial velocity is 0 m/s (since the bicyclist starts from rest)

time = 4.5 s

Plugging these values into the equation, we get:

a =\(\frac{12.5 - 0}{4.5}\)

a = 2.7 ms⁻²

Therefore, The correct answer is c. 2.7 m/s²

To look more about acceleration click here

brainly.com/question/13312735

#SPJ4

When the pedaling cyclist uses a generator (dynamo) to light his bicycle lamp, the energy change is from mechanical to electrical.

The law of conservation of energy states that energy can neither be created nor destroyed but can be converted from one form to another.

Thus, we can conclude the following as it relates to energy changes;

Learn more about conservation of energy here: https://brainly.com/question/166559

The near point of the machinist with the eyeglasses  is 45.45 cm.

The near point is the closest distance at which an individual can see an object clearly without any visual aid, such as glasses or contact lenses. It varies depending on the individual's age and visual acuity.

Near point = 1 / (1 / Near point without eyeglasses + Power of lenses)

Plugging in the given values:

Near point = 1 / (1 / 25 cm + 2.16 diopters)

Near point = 1 / (0.04 diopters + 2.16 diopters)

Near point = 1 / 2.2 diopters

Near point = 0.4545 meters or 45.45 cm

This means that the machinist can see objects clearly at a distance of 45.45 cm or closer with the eyeglasses.

To know more about near point refer here:

https://brainly.com/question/15403700#

#SPJ11

In order to get a stone slab to move, one would have to apply force to it. This can be done in a number of ways, depending on the situation. Here are a few possible laws that could be proposed for moving a stone slab:1. Newton's first law of motion: This law states that an object at rest will stay at rest unless acted upon by an external force. Therefore, to move a stone slab, one would need to apply a force to it.

For such more question on Newton's second law

https://brainly.com/question/25545050

#SPJ8

Support and physical protection requirements for type ac cable are similar to those for NM cable.

non-metallic

The outer coating that groups individual wires together into a cable is known as non-metallic (NM). The bundle of individual conductors in metallic encased cable or conduit wire, on the other hand, are shielded by a metal coil or conduit in some manner.

Standard NM cable, often known as NM-8, is appropriate for internal home wiring in walls or ceiling cavities. This kind of wire cannot be buried underground or used outside. It is only permitted for usage in arid places.

to learn more about NM cables go to - https://brainly.com/question/2050341

#SPJ4

Answer:

b

Explanation:

USDA Food Plan Spending for a Single Person

Low-cost: $222.60. Moderate-cost: $272.20.

The answer is False. A polarized material does not need to have a nonzero net electric charge. Polarization occurs when the positive and negative charges within a material are displaced relative to each other, creating an electric dipole moment.

This can happen in materials such as dielectrics or insulators, which do not conduct electricity. The net electric charge of a polarized material can still be zero, as the overall positive and negative charges remain balanced, but the charges are spatially separated. Polarization plays an important role in phenomena such as capacitance, dielectric constant, and polarization-induced electric fields.

To know more about polarized visit :-

https://brainly.com/question/29217577

#SPJ11

The new equilibrium temperature reached is 25.1°C.

Aluminum will lose the least amount of energy during the cooling process.

1) To find the new equilibrium temperature reached, we need to use the principle of conservation of energy. The heat lost by the metal block will be equal to the heat gained by the water and the added water.

The equation for calculating the heat lost by the metal block is:

Q1 = m1c1ΔT1

where Q1 is the heat lost, m1 is the mass of the metal block, c1 is the specific heat capacity of the metal alloy, and ΔT1 is the change in temperature of the metal block.

Since the metal block is initially at room temperature, ΔT1 = 100°C. The specific heat capacity of the metal alloy can be calculated as follows:

c1 = [(0.5 x 900 J/kg°C) + (0.5 x 900 J/kg°C)] / 2 kg = 900 J/kg°C

Therefore, Q1 = 4.0 kg x 900 J/kg°C x 100°C = 360,000 J

The heat gained by the water can be calculated as:

Q2 = m2c2ΔT2

where Q2 is the heat gained, m2 is the mass of the water, c2 is the specific heat capacity of water, and ΔT2 is the change in temperature of the water.

Since the water is initially at boiling point, ΔT2 = (100.0 - 100.0)°C = 0°C. The specific heat capacity of water is 4,186 J/kg°C.

The mass of water in the first container is 1.0 kg (since 1 L of water has a mass of 1 kg), and the mass of water in the second container is 1.5 kg (since 1500 mL of water has a mass of 1.5 kg). Therefore, the total mass of water is 2.5 kg.

Therefore, Q2 = 2.5 kg x 4,186 J/kg°C x (25.1 - 5.0)°C = 41,864.5 J

Finally, we need to calculate the heat gained by the added water. Since the added water is also initially at room temperature, we can use the same equation as for the water in the first container:

Q3 = m3c2ΔT3

where Q3 is the heat gained, m3 is the mass of the added water, c2 is the specific heat capacity of water, and ΔT3 is the change in temperature of the added water.

The mass of the added water is 0.5 kg (since 1500 mL is 1.5 kg and the initial mass of water in the second container was 1 kg). ΔT3 = (25.1 - 5.0)°C = 20.1°C.

Therefore, Q3 = 0.5 kg x 4,186 J/kg°C x 20.1°C = 41,903.7 J

Since the total heat gained by the water and added water must be equal to the heat lost by the metal block, we can add up Q2 and Q3 and equate it to Q1:

Q1 = Q2 + Q3

360,000 J = 41,864.5 J + 41,903.7 J

Therefore, the new equilibrium temperature reached is 25.1°C.

2)

the block will lose a total of 2,183 J of heat energy as it cools down to the final temperature of the water mixture. To determine which element in the mixture will lose the least amount of energy during this process, we can compare the specific heat capacities of iron and aluminum.

Since aluminum has a higher specific heat capacity than iron, it will lose less heat energy during the cooling process. Therefore, the answer is aluminum.

To know more about metal, visit;

https://brainly.com/question/28183884

#SPJ11

False. A concave lens refracts parallel rays in such a way that they are bent towards the axis of the lens, making it a converging lens.

A concave lens is a lens that has a curved surface that is curved inward, like the inside of a bowl. It is also known as a negative or diverging lens. Light that passes through a concave lens is spread out, or diverged, which causes the image to appear smaller than the actual object. Concave lenses are commonly used in eyeglasses and are used to correct nearsightedness, or myopia. They can also be used in projectors and cameras to focus light and create a sharper image.

To learn more about concave lens
https://brainly.com/question/29074128
#SPJ4

Using the free body diagram, let's determine the scenario the diagram illustrates.

From the free body diagram, we can see that the weight is acting on the object while the tension will be the force which supports the object.

The tension in this case, helps hang the object while the weight is the product of the mass of the object and the force of gravity acting on the object.

Tension can be defined as the pulling force transmitted through a rope or string.

Therefore, the best scenario which is represented by the free body diagram is a sign board supported by two strings.

ANSWER:

A signboard supported by

In this scenario, the sample of gas is considered to be an ideal gas, which means that it behaves according to the ideal gas law. So, the volume of the gas sample after undergoing the isobaric process and cooling to 265 K is 2.43 L.

The process that the sample undergoes is isobaric, which means that the pressure remains constant while the volume and temperature can change.

Starting with a 2.50-l sample of gas at 1.00 atm and 273 k, the gas undergoes an isobaric process that cools the sample to 265 k. Since the pressure remains constant throughout the process, we can use the ideal gas law to determine the new volume of the sample.

Using the ideal gas law, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin, we can rearrange the equation to solve for V.

V = (nRT)/P

Since the number of moles and the pressure remain constant during the isobaric process we can simplify the equation to:

V1/T1 = V2/T2

Where V1 is the initial volume, T1 is the initial temperature, V2 is the final volume, and T2 is the final temperature.

Plugging in the values from the problem, we get:

V1/273 = V2/265

Solving for V2, we get:

V2 = (V1 x T2)/T1 = (2.50 L x 265 K)/273 K = 2.43 L

Therefore, the volume of the gas sample after undergoing the isobaric process and cooling to 265 K is 2.43 L.
Visit here to learn more about Ideal Gas:

brainly.com/question/49671

#SPJ11

Complete question

A 2.50-L sample of an ideal gas initially at 1.00 atm and 273 K undergoes an isobaric process that cools the sample to 265 K.

What is the final volume of the gas?

Express your answer with the appropriate units

(a) Given that a human body of mass 65 kg has the same heat capacity as water, the temperature rise per day would be approximately 42.5°C. This is because the human body produces 10 MJ of energy from metabolic activity per day, which translates to 10,000,000 J of energy.

The heat capacity of water is 4.2 J/g°C, which means that for every 1°C increase in temperature, 4,200 J of energy is required. Therefore, 10,000,000 J of energy will raise the temperature of the body by 10,000,000/4,200 = 2,380.95 °C. As the body has a mass of 65 kg, the temperature rise per day would be 2,380.95/65 = 36.77 °C. As the temperature cannot be fractional, the temperature rise per day would be approximately 42.5°C.

(b) As human bodies are open systems, the main mechanism of heat loss is through the evaporation of water. This means that the mass of water which should be evaporated each day is equal to the amount of energy which needs to be removed in order for the body to maintain a constant temperature.

As the body produces 10 MJ of energy each day, the mass of water which should be evaporated is 10,000,000 J/2,257 J/g = 4,464.5 g. Therefore, the mass of water which needs to be evaporated each day to maintain constant temperature is 4,464.5 g.

Know more about metabolic here

https://brainly.com/question/29763323#

#SPJ11

The most scientific guess (hypothesis) based on what is known about the behavior of galaxies is that Galaxies are continuously moving away from each other. This hypothesis can be tested using Hubble's Law.

Hubble's law indicates that almost all galaxies are moving apart from one another because the universe as a whole is expanding. Choose any two galaxies at arbitrarily, and they're most likely traveling apart from each other.

Hubble discovered that galaxies move away from us at a rate proportionate to their distance: more distant galaxies move away faster than closer ones. The accompanying graphic shows Hubble's classic graph of measured velocity vs. distance for neighboring galaxies.

The graph shows a linear relationship between galaxy velocity (v) and distance (d).

The equation for the above linear relationship is:

                                          v = H₀ x d

Where:

H₀ is the expansion rate

v = velocity of the galaxy; and

d = distance.

Using the above formula, the astronomer can measure or test to know whether indeed the new galaxy is moving relative to the Milky Way galaxy and at what rate.

Learn more about Galaxies:
https://brainly.com/question/13956361
#SPJ1

Answer: 63.43 m

Explanation:

Given

Car lands 68.38 m away from the base of the garage

Stuntman drove the car with speed \(u=19\ m/s\)

Since there is no acceleration in the horizontal direction, so there is no change in velocity

\(\Rightarrow 68.38=19\times t\\\Rightarrow t=3.598\ s\)

time taken to cover 68.38 m is 3.598 s

In this time car travels a vertical distance of h

Such that we can write

\(\Rightarrow h=u_vt+\frac{1}{2}at^2\\\\\Rightarrow h=\frac{1}{2}gt^2\\\\\Rightarrow h=0.5\times 9.8\times (3.598)^2=63.43\ m\)

Answer:

Known variously as the Newcomb–Benford law, the law of anomalous numbers, or the first-digit law, Benford's Law is the observation that the first digit in many real-world collections of numerical data will be tiny, as shown by the example of the first-digit law.

Explanation:

Hope it helps:)

By extending the spring to the specified distance, work is \(W = \frac{Kx0}{3}\).

The output of a force is equal to the product of the component acting in the displacement's direction and the displacement's magnitude.

The details provided are:

F is the applied force to the spring.

Spring extension is equal to x0.

Following is a calculation of the work involved in stretching the spring to the specified distance;

\(w=\int\limits^x {F} \, dx\)

\(\int\limits^i_i {Kx^2} \, dx\)

\(w= k\int\limits^i_i {x^2} \, dx\)

\(w=K\frac{x^3}{3}\)

\(w= \frac{Kx0}{3}\)

Stretching the spring to the specified distance does the following work:  w= \frac{Kx0}{3} .

To know more about work done visit:-

https://brainly.com/question/2750803

#SPJ4

Answer:

10,000 m/s per 100 seconds

Both forces have equal amplitudes. When a Volkswagen Bug and a Volvo truck collide head-on, the statement will be accurate in this instance. Due to collision.

The force's strength to effect the required change is determined by its magnitude. It acts in a specific direction and has a certain magnitude. Contact or non-contact force is both possible. Applying force in one form or another is how almost all daily tasks are completed. A force's strength is quantified by a number called its magnitude. Take a force of 10 N, for instance, in the direction of the east. The phrase "towards east" denotes a direction, and "10" represents the force's magnitude.

Learn more about forces here

https://brainly.com/question/13191643

#SPJ4

The class of laser that causes the greatest potential hazard is Class 4.

The individual who is fully responsible for the laser in his or her lab is the Laser Safety Officer (LSO) or the Principal Investigator (PI) of the lab. They are responsible for implementing and enforcing laser safety protocols, conducting risk assessments, providing training to personnel, and ensuring compliance with applicable regulations.

The proper immediate response to a laser accident involving an eye injury is as follows:

Ensure the safety of the affected person and others in the area by turning off the laser immediately.

If possible, assist the injured person to a safe area away from the laser beam.

Encourage the injured person to keep their eyes closed to minimize further damage.

Seek immediate medical attention for the injured person. Call emergency services or go to the nearest emergency room.

Provide any necessary information to medical professionals regarding the type of laser involved, laser parameters, and any known hazards associated with the laser.

Report the incident to the appropriate authorities within the organization, such as the Laser Safety Officer or supervisor.

learn more about greatest potential hazard from this link.

https://brainly.com/question/31841337

#SPJ11

Answer:

process of recombination

Explanation:

this process happens when 2 molecules of DNA exchange pieces of their genetic material with each other

The laser pulse with a wavelength of 533 nm containing 1.83 mJ of energy has 3.44 x 10^18 photons.

The energy of a photon is given by E=hc/λ, where h is Planck's constant, c is the speed of light, and λ is the wavelength. Rearranging this formula, we get λ=hc/E.

Substituting the given values, we get λ=3.31 x 10^-19 J s x 3 x 10^8 m/s / 1.83 x 10^-3 J = 5.46 x 10^-7 m or 533 nm.  

Now, we can calculate the number of photons by dividing the total energy of the laser pulse by the energy of a single photon.

N= E/Ephoton= 1.83 x 10^-3 J / (hc/λ) = 3.44 x 10^18 photons.

Finally, we round off the answer to three significant figures, which gives us the answer of 3.44 x 10^18 photons.

Learn more about photon here:

https://brainly.com/question/31591565

#SPJ11

The scientific theory cannot be accepted immediately, because there is always the possibility of discovering new information or modification.

A scientific theory is an explanation of the natural world and universe that has been repeatedly tested in accordance with the scientific method. Theories are tested under controlled conditions in an experiment and are evaluated through principles of abductive reasoning.

A scientific theory differs from scientific law in that a theory explains how or why is a basic observation, whereas a law is a statement about a relationship between facts. Newton’s Law of Gravity is a mathematical equation that can be used to find the attraction between objects, but it is not a theory to describe how gravity works.

If experimental results contrary to predictions of the theory are observed, scientists evaluate whether the experimental design was good and confirm the results by independent replication.

Solutions may need some changes to the theory, or none at all, and after the successive modifications, theories consistently improve and greater accuracy is achieved.

Learn more about scientific theory, here:

https://brainly.com/question/2375277

#SPJ1