a btu is defined as the amount of energy required to raise the temperature of one lb of water by one degree celsius group of answer choices true false

When you are working on a magnetic levitation experiment in a lab and beta radiation is emitted directly at you, passing through the magnets first, you are not safe because it was beta radiation and very dangerous.

The correct answer is option a.

Beta radation is a form of ionizing radiation that is made up of high-energy beta particles. Beta particles are high-energy, high-speed electrons or positrons that are emitted by certain radioactive isotopes. The emission of beta radiation from radioactive materials is referred to as beta decay.

Beta particles, unlike alpha particles, have a longer range and can penetrate through paper, skin, and other low-density materials but can be blocked by high-density materials.

Therefore, option a is correct.

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If q1 and q2 are like charges of equal magnitude, the third charge q3 must be placed at the origin (x = 0) on the x-axis to be in electrostatic equilibrium.

In this case, since q1 and q2 are like charges, they repel each other. To achieve equilibrium, the net force on q3 must be zero. Placing q3 at the origin (x = 0) ensures that the electrostatic forces from q1 and q2 cancel each other out, resulting in a net force of zero on q3. If q1 and q2 are unlike charges of equal magnitude, the third charge q3 must be placed at a point on the x-axis between q1 and q2 to be in electrostatic equilibrium.In this scenario, since q1 and q2 are unlike charges, they attract each other. To achieve equilibrium, the net force on q3 must be zero. By placing q3 at a point on the x-axis between q1 and q2, the electrostatic forces from q1 and q2 can balance each other out, resulting in a net force of zero on q3.The specific location on the x-axis between q1 and q2 where q3 needs to be placed for electrostatic equilibrium can be determined using the principles of electrostatics and Coulomb's Law.

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The velocity of the ion released from rest and accelerated through a potential difference of 152V is 6.34 × 10^5m/s.

The electric potential difference is a scalar quantity that measures the energy required per unit of electric charge to transfer the charge from one point to another. The electric potential difference between two points in an electric circuit determines the direction and magnitude of the electric current that flows between those two points. A lithium-ion containing three protons and four neutrons has a mass of 1.16 × 10-26 kg. The ion is released from rest and accelerates as it moves through a potential difference of 152 V.

The change in electric potential energy of an object is equal to the product of the charge and the potential difference across two points. The formula to calculate the velocity of the ion released from rest and accelerated through a potential difference of 152V is:

v = √(2qV/m) where q is the charge of the ion, V is the potential difference, and m is the mass of the ion.

Substituting the values in the formula, we get:

v = √(2 × 1.6 × 10-19 C × 152 V/1.16 × 10-26 kg)v = 6.34 × 10^5m/s

Therefore, the velocity of the ion released from rest and accelerated through a potential difference of 152V is 6.34 × 10^5m/s.

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Answer: 5.26 x 10 -7 squared m

Explanation: I did the CK12 assignment :)

Answer:

B

Explanation:

Got it right

Answer:

B. X: Releases energy to the photosphere

Y: Takes longer for photons to move through

Explanation:

Right on ED2021, goodluck!

The current through the 2Ω resistor is 9.5A

The terminal voltage is 10.8 V

a) The voltage V across 8 Ω resistor is V = I*R = 8*0.5 = 4V

the current through 16Ω resistor is then I = V/R = 4/16 = 0.25 A

the current through 20Ω resistor is then I = current through 8Ω resistor + current through 16Ω resistor = 0.75 A

voltage across 20Ω is V = I*R = 0.75*20 = 15 V

the source voltage is Vs = V8 + V20 = 4+15 = 19 V

therefore the current through 2Ω resistor is

I = V/R = 19/2 = 9.5 A

b) The terminal voltage is

Vterminal = VR = I*R = 0.450*24 = 10.8 V

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Answer:

a} Infrared radiant heaters.

b} Fan heaters.

Explanation:

I hope this is okay, should I give more.

Atoms of the pair of elements that will form ionic bonds in a compound are : C.) I and F.

Ionic bonds are a type of linkage created by electrostatic attraction between ions with opposing charges in chemical compounds.

Iodine has electronegativity of 2.66 and Fluorine has electronegativity of 3.98, which is a difference of 1.32. This large difference in electronegativity makes it favorable for Iodine to lose an electron and for Fluorine to gain an electron, forming ionic bond in compound.

The formation of ionic bonds occurs between atoms with large difference in electronegativity, where one atom loses electrons and other gains electrons to achieve  stable electron configuration.

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The initial velocity of the ball that was thrown downward from a height of  35 m is 4.53 m/s².

Velocity is the rate of change of displacement.

To calculate the initial velocity of the ball, we use the formula below,

Formula:

Where:

From the question,

Given:

Substitute these values into equation 1 and solve for u

Hence, the initial velocity is 4.53 m/s².

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Answer:

A - energy is absorbed in the reaction

Explanation:

We know

\(\boxed{\sf Spring\:constant(K)=\dfrac{F}{x}}\)

\(\\ \sf\longmapsto K=\dfrac{1}{0.5}\)

\(\\ \sf\longmapsto K=2N/m\)

The car slows down by acceleration - 10 m/s² before stopping.

Given data are:

Initially moving at 30 m/s

The car's final speed is 0 m/s as it comes to a halt.

t = 3.0 seconds.

Acceleration equals a.

using the equation v = u + at, we obtain

0 = 30 + 3t

a = - 10 m/s²

The vehicle suffers a - 10 m/s² slowdown as a result.

Acceleration is the general term for any process where the velocity changes. There are only two ways to accelerate: either by increasing speed or decreasing direction, or both. The reason for this is that velocity includes both a speed and a direction.

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According to the given statement the car slows down by acceleration - 10 m/s² before stopping.

Any procedure where the velocity varies is referred to as acceleration. There are only two ways to accelerate: either by accelerating faster, or by accelerating in the opposite direction. This is because velocity consists of both a speed and a direction.

v = initial velocity (20m/s)

u = final velocity (0 m/s)

t = 3.0 seconds.

Acceleration equals a.

Using the equation v = u + at, we obtain

30 = 0 + at

a = - 10 m/s²

The car's acceleration  is -10m/s².

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Answer:Falling objects form an interesting class of motion problems. For example, we can estimate the depth of a vertical mine shaft by dropping a rock into it and listening for the rock to hit the bottom. By applying the kinematics developed so far to falling objects, we can examine some interesting situations and learn much about gravity in the process.

Explanation:

hello! it is velocity.

i say this because, Inertia is the tendency of an object to resist changes in its state of motion. ... The state of motion of an object is defined by its velocity - the speed with a direction.

The advantage of selecting the wavelength of maximum absorption for determining absorbance values for the preparation of a beer’s law plot is the absorbance value at a certain wavelength is calculated for each spectrum.

In general, choosing a wavelength where the absorbance is highest is preferable since it will reduce the measurement's relative error. The next step is to create a plot of absorbance vs. concentration (a Beer's Law plot). It will be the wavelength with the highest absorption that will be used for the other measurements. This is due to the species present in the solution is at their most reactive wavelength, which has the highest absorbance.

This implies that there will still be meaningful measurements at low concentrations. In UV-Vis spectroscopy, the wavelength of the target chemical that has the highest absorption is chosen for investigation. This decision guarantees utmost sensitivity.

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Stars form from molecular clouds through a process known as stellar formation.

These clouds, characterized by low temperatures and high densities, provide the ideal conditions for atoms to combine and form molecules. With a mass range spanning from a few solar masses to millions of solar masses, molecular clouds serve as the birthplaces of new stars. The Pleiades cluster serves as a notable example of stars that have recently formed within such a stellar nursery.

The formation of stars from molecular clouds involves several key steps. Firstly, gravitational forces acting on regions of higher density within the cloud cause them to collapse under their own gravity. As the cloud collapses, it begins to fragment into smaller, denser clumps called protostellar cores. These cores continue to collapse, and their central regions become increasingly dense and hot. At this stage, they are known as protostars.

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Answer:

The kinetic energy is 16 joules.                        

Explanation:

Kinetic energy (E) is given by:

\( E = \frac{1}{2}mv^{2} \)

Where:

m: is the mass

v: is the speed

When the kinetic energy is 4 joules, the speed of the object is:

\( v_{1}^{2} = \frac{2E_{1}}{m} = \frac{8}{m} \)                         

Now, if the speed is increased twice then we have:

\( E_{2} = \frac{1}{2}mv_{2}^{2} = \frac{1}{2}m(2v_{1})^{2} = \frac{1}{2}m[4(\frac{8}{m})] = 16 J \)

Therefore, the kinetic energy is 4 times the initial value.  

I hope it helps you!                                

Answer:

True

Explanation:

idk

Answer:

1226.25 N

Explanation:

w = mg = 125 (9.81) = 1226.25 N

The movement of a pool ball, after being struck by a cue, is an example of Newton's second law of motion.

According to Newton's second law of motion, an object's acceleration is directly proportional to the magnitude of the applied net force.

Newton's second law of motion is also known as law of momentum. It says that the rate of change of momentum is equal to the net force acting.

The cue ball will stop moving immediately after colliding with a still pool ball if it hits it directly. The other ball, which will now be moving forward at the same speed as the cue ball did before the collision, will have received all of the kinetic energy that was in the first ball.

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Answer:

Approximately \(6.5 \times 10^{5}\; {\rm W}\).

Explanation:

At a speed of \(v\), the kinetic energy of the ride and the riders of mass \(m\) (combined) would be:

\(\begin{aligned} \text{KE} &= \frac{1}{2}\, m\, v^{2}\end{aligned}\).

If friction is negligible, \(\text{KE} = (1/2)\, m\, v^{2}\) would be the work required to achieve this speed. That is:

\(\begin{aligned} \text{work} = \text{KE} = \frac{1}{2}\, m\, v^{2}\end{aligned}\).

Given that this work was completed in a duration of \(t\), the average power would be:

\(\begin{aligned} & (\text{average power})\\ =\; & \frac{(\text{work})}{(\text{time required})} \\ =\; & \frac{(1/2) \, m\, v^{2}}{t}\end{aligned}\).

Substitute in \(m = 5000\; {\rm kg}\), \(v = 27\; {\rm m\cdot s^{-1}}\), and \(t = 2.8\; {\rm s}\):

\(\begin{aligned} & (\text{average power}) \\ =\; & \frac{(1/2) \, m\, v^{2}}{t} \\ =\; & \frac{(1/2) \times 5000\; {\rm kg} \times 27\; {\rm m\cdot s^{-1}}}{2.8\; {\rm s}} \\ \approx \; & 6.5 \times 10^{5}\; {\rm W}\end{aligned}\).

(Note that if acceleration is constant, the power input to the ride would be proportional to \(t^{2}\). The average power of input to the ride would be a quarter of the peak power input. Multiplying average velocity (proportional to \(t\)) by average force (proportional to \(t\)) would overestimate the average power by \(100\%\).)

Answer:

6,400

Explanation:

i made sure  the other person was right and i got the same answer

Answer:

option A

Explanation:

the diameter is twice the length of the radius

hope it helps

In addition to heating the Earth's oceans and atmosphere and causing weather patterns, the Sun also gives energy to the planet's green, expanding vegetation, which provides food and oxygen for life.

Despite the fact that its heat and light are what make the Sun so well-known to us, it also has other, less obvious effects on the planet and human culture. The emission or transmission of energy as waves or particles through space or through a material medium is referred to as radiation in physics. The electromagnetic spectrum, which encompasses radio waves, microwaves, infrared, visible light, ultraviolet, x-rays, and gamma radiation, is included in this. One of a body's fundamental characteristics is mass. Before the discovery of the atom and particle, it was widely believed that it was tied to the amount of matter in a physical body.

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It emits solar energy, which enables life to exist on Earth, in the form of light and heat. To flourish, plants require sunshine. Humans and other animals alike depend on plants for food and the oxygen they create.

Solar energy is a renewable resource that plays a significant part in lowering greenhouse gas emissions and preventing climate change, which is essential for safeguarding people, animals, and ecosystems. Additionally, the usage of solar energy can minimize water consumption and enhance air quality.

When natural resources are restored more quickly than they are used up, it is said to be using renewable energy. Such sources that are constantly replenished include the sun and the wind, for instance.

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ANSWER

False.

EXPLANATION

In radioactive decay (or nuclei decay), an unstable nucleus emits radiation into a nucleus that is table and has less energy and a lower mass.

Therefore, nuclei decay from a less stable form to a more stable form.

The answer is false.

The focal length should be 60 cm.

The distance between the pole of the mirror ( or the optical center of the lens) and the focal point of a mirror (or lens) is called the focal length.

In optics, the relationship between the distance of the image (v), the distance of the object (u), and the focal length (f) of the lens is given by the formula known as the Lens formula. The Lens formula is applicable for convex as well as concave lenses. These lenses have negligible thickness.

The person suffers from long sighted-ness. The near point has gone far . For an object kept at 30 cm to be visible, the image of it must be formed at 60 cm i.e. the ray of light must appear to be coming from 60 cm . For  it, convex lens is required.  So

u = -30 cm

v = -60 cm

Using lens formula, we get:

1/v - 1/u = 1/f

- 1/ 60 + 1/ 30 = 1/f

( - 1 + 2) / 60 = 1 / f

f =  60 cm

So, the focal length should be 60 cm.

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