What can Lisa do to increase the strength of the electromagnet?


She can use a nail with weaker magnetic properties.

She can change the direction of the nail.

She can move the wire loops closer together.

She can reduce the number of wire loops.

Answer:

Light entering  through a small hole in a door is an example if Diffraction.

Explanation:

Slight bending of light passing  through an edge or  opening  of an object is called as diffraction of light.  The rate of bending of light depends on the size of slit or opening in the object and relative size of light’s wavelength.

If the slit or the opening is much larger than the wavelength of the light, the bending  of the light will be almost  smaller and becomes unnoticeable. If  both the slit and the opening are equal in  size, the light bends to an considerable amount.There are two types of diffraction namely  Fraunhoffer diffraction and Fresnel diffraction.

Answer:

450 Bq, 0.15325u

Explanation:

Half life equation:

A = A₀ (½)^(t / T)

A = (7200 Bq) (½)^(22 min / 5.50 min)

A = 450 Bq

Mass defect is the difference between the sum of the proton and neutron masses and the isotope mass.

The mass of a proton is 1.007276u, and the mass of a neutron is 1.008665u.

So the mass defect is:

(8 × 1.007276u + 10 × 1.008665u) − 17.99161u

0.15325u

A nuclear reaction will not be affected with the use of a catalyst.

The incorrect statement is that the rate of a nuclear reaction is increased by the addition of a catalyst. Nuclear reactions result in significant energy changes and the transformation of elements or isotopes, but they are not influenced by catalysts or the chemical state of atoms.

One of the statements about nuclear reactions provided in the student's question is not true. In fact, the statement that the rate of a nuclear reaction is increased by the addition of a catalyst is incorrect. Unlike chemical reactions, the rate of a nuclear reaction is not affected by catalysts because nuclear reactions involve changes within the nucleus of an atom, and catalysts do not have the ability to affect the nuclear forces that govern these reactions.

Nuclear reactions are significant because they involve much larger energy changes compared to ordinary chemical reactions. The energy released or absorbed during nuclear reactions can result in a measurable change in mass, according to the principle of mass-energy equivalence. Also, these reactions often lead to the formation of different isotopes or even different elements, depending on the changes within the atomic nucleus.

Furthermore, nuclear reactions are not influenced by the chemical state of the atoms involved or by the presence of a catalyst. They depend primarily on factors related to the nuclei themselves, such as neutron flux in a fission reactor or temperature and pressure in a fusion reaction.

Answer:

Peaks

Explanation:

- A transverse wave is a wave in which the oscillation occurs in a direction perpendicular to the direction of propagation of the wave

- A longitudinal wave is a wave in which the oscillation occurs in a direction parallel to the direction of propagation of the wave

In a transverse wave, the highest and the lowest points of the wave are determined by the presence of crests (peaks) and troughs. On the contrary, in a longitudinal wave, the wave consists of alternating regions of higher particle density (called compressions) and of lower particle density (called rarefactions).

Therefore, the correct answer is

peaks

Answer:

Peaks, Dips

Explanation:

I got the question right

Answer:

I'm not sure if I have the right words for it, but it is most likely that all three rays will form a larger inverted image after they pass through the lens because the arrow is outside the focal point. The image will be outside of F2, like the arrow is outside of F1.

Explanation:

Due to the shape of the lens in the diagram, you can imagine 3 lines branching out from point Q. I've made a digital sketch about what will happen as they pass through. It's a little crude, but it still works. I hope this was helpful.

The three principal rays intersect at the right side of the convergent lens.

To find the answer, we need to know about the trace of the principal rays.

The three principal rays are as follows

All the above rays are drawn from the tip of the pointed arrow.

Thus, we can conclude that the three principal rays intersect at the right side of the convergent lens.

Learn about the principal rays here:

brainly.com/question/766997

#SPJ2

C is the answer if not I’m sorry but I came to the conclusion of C being the answer

Answer:

The answer is A. Because it describes better a semiconductor diode

Explanation:

A semiconductor diode is formed of a junction of P dopped material (excess of electrons), with a N dopped material (absence of electrons). Under the correct polarization, the electron flows from one side to another, other way electrons wont flow.

Answer:

A the distance between the positive charge and the electron

B the charge on the electron

D the charge of the positive charge

Explanation:

The electric field produced by the positive charge Q at the location of the electron is given by

[tex]E=k\frac{Q}{r^2}[/tex]

where

k is the Coulomb constant

Q is the charge

r is the distance between the charge Q and the electron

The force exerted on a charged particle by an electric field is given by

[tex]F=qE[/tex]

where q is the magnitude of the charged particle. So, the force exerted on the electron in this problem is

[tex]F=eE = k\frac{eQ}{r^2}[/tex]

where e is the charge of the electron. As we see from the equation, the force depends only the following quantities:

A the distance between the positive charge and the electron (r)

B the charge on the electron (e)

D the charge of the positive charge (Q)

Final answer:

The force on an electron in an electric field depends on the distance between the positive charge and the electron, the charge on the electron, and the charge of the positive charge. Factors such as the masses and radii of the charges do not directly affect the electrostatic force.

Explanation:

An electric field is created by electric charges and can exert a force on other charges within the field. The force on an electron in an electric field created by a positive point charge depends on several factors. Let's identify these dependencies.

A. The distance between the positive charge and the electron: The force is inversely proportional to the square of the distance between the charges (r2).

B. The charge on the electron: The electrostatic force exerted on the electron is proportional to the magnitude of its charge.

D. The charge of the positive charge: The magnitude of the electric field, and therefore the force on the electron, is proportional to the charge of the positive point charge (Q).

The mass of the electron (C), the mass of the positive charge (E), the radius of the positive charge (F), and the radius of the electron (G) do not affect the electrostatic force the electron experiences.

Explanation:

The Drag Force equation is:

[tex]F_{D}=\frac{1}{2}C_{D}\rho A_{D}V^{2}[/tex]   (1)

Where:

[tex]F_{D}[/tex]  is the Drag Force

[tex]C_{D}[/tex]  is the Drag coefficient, which depends on the material

[tex]\rho[/tex]  is the density of the fluid where the bicycle is moving (air in this case)

[tex]A_{D}[/tex] is the transversal area of the body or object

[tex]V[/tex] the bicycle's velocity

Now, if we assume [tex]C_{D}[/tex], [tex]\rho[/tex] and [tex]A_{D}[/tex] do not channge, we can rewrite (1) as:

[tex]F_{D}=C.V^{2}[/tex]   (2)

Where [tex]C[/tex]  groups all these coefficients.

So, if we have a new velocity [tex]V_{n}[/tex] , which is the double of the former velocity:

[tex]V_{n}=2V[/tex]   (3)

Equation (2) is written as:

[tex]F_{D}=C.V_{n}^{2}=C.(2V)^{2}[/tex]

[tex]F_{D}=4CV^{2}[/tex]   (4)

Comparing (2) and (4) we can conclude the Drag force is four times greater when the speed is doubled.

The 30-gram bullet fired and 50-gram bullet dropped from the same height, ignoring air resistance, will hit the ground at the same time. The reason is that the acceleration due to gravity is a constant and act only vertically downward. If air resistance were present, the fired bullet would hit the ground first due to deceleration caused by air resistive force.

The subject of this question is Physics, and it deals with the concept of free fall and projectile motion. Free fall is a type of motion in which an object falls downward due to gravitational force only, with no other forces having an impact. Projectile motion is the motion of an object that is launched into the air and subject to gravity and air resistance.

In this case, we are asked which of the two objects, a bullet fired horizontally and another dropped directly downward from the same height, will hit the ground first, ignoring air resistance. The surprising answer is that they hit the ground at the same time. While the fired bullet travels a further horizontal distance, the vertical component of its motion behaves just like that of the dropped bullet. Therefore, both bullets hit the ground simultaneously.

However, if air resistance is taken into account, the bullet will decelerate quicker due to its higher speed resulting in a greater air resistive force. This would cause the fired bullet to hit the ground first. This is derived from the fundamental laws of Physics that describe the effect of gravity on an object's motion. The acceleration due to gravity is a constant and acts only vertically downward, therefore, it affects both scenarios the same, making both bullets hit the ground at the same time in vacuum.

https://brainly.com/question/15710362

#SPJ12

Answer:

decrease by a factor 10

Explanation:

The parallax angle of a close star is given by

[tex]p=\frac{1}{d}[/tex]

where

p is the parallax angle

d is the distance of the star from Earth, in parsecs

From the formula we see that the parallax angle is inversely proportional to the distance.

In this problem, the distance of the star is increased by a factor 10:

d' = 10 d

so the new parallax angle would be

[tex]p'=\frac{1}{10 d}=\frac{1}{10}\frac{1}{d}=\frac{p}{10}[/tex]

So, the parallax angle would decrease by a factor 10.

If the star Alpha Centauri were moved to a distance 10 times farther than its current position, its parallax angle would become 10 times smaller due to the inverse relationship between parallax and distance.

The concept in question is related to the parallax method in astronomy, a way to measure the distances to nearby stars relative to distant ones. This method works because of Earth's annual motion around the Sun, essentially creating a large baseline and a triangle. Parallax is defined as the one-half angle that a star appears to shift when observed from different sides of the Earth's orbit, and this shift decreases with distance.

If the star Alpha Centauri were moved to a distance 10 times farther than it is now, it’s parallax angle would become 10 times smaller. This is because parallax and distance have an inverse relationship: as distance increases, parallax decreases, and vice versa. This rule applies to any interstellar object observed from Earth, including Alpha Centauri. Therefore, the parallax angle of Alpha Centauri would be one tenth of what it is now if it were 10 times farther away.

https://brainly.com/question/31173601

#SPJ3

Answer:

Amygdala, Frontal cortex

Explanation:

The amygdala is part of the brain responsible for aggressive behavior, fear and immediate reactions associated with high risks. The frontal cortex, on the other hand, is the part of the brain responsible for reasoning. Because the former matures faster than the latter in adolescents, then teens' behavior is generally associated with high risks and little reasoning before acting.

Answer: They move more slowly, causing the forces of attraction holding them together to increase, resulting in a liquid.

Explanation:

The attraction overcomes the movement of particles, and bonds form.

The path difference between the two waves is the path difference between the two waves should be one and one-quarter of a wavelengths.

Wavelength is the distance between two identical or similar positions it means that it is the distance between crests or trough in the adjacent cycle of the waveform.

Wavelength is denoted by (lambda).

It is measured in meter, or centimeter, or millimeters.

Mathematically,

Wavelength is equal to velocity divided by frequency,

So,

Wavelength (lambda) = Velocity/frequency.

Velocity is in meter per second.

Frequency is in 1/second.

Prism is a transparent object in which if  sunlight is passed then it will be split in a VIBGYOR

where V = vilot, I = indigo, B = blue, G = green, Y = Yellow, O = orange, R = red.

In this series wavelength of red is higher and vilot is smaller and frequency of violet is higher and red is smaller.

Therefore, The path difference between the two waves is the path difference between the two waves should be one and one-quarter of a wavelengths.

Learn more about wavelength here:

https://brainly.com/question/13533093

#SPJ6

Answer:

Red light has longer wavelength, while blue light has higher frequency

Explanation:

Red light and blue light corresponds to two different portion of the visible part of the electromagnetic spectrum.

The two colors have different wavelengths - more precisely:

Blue: 450 - 500 nm

Red: 620 - 750 nm

So, we see that red light has a longer wavelength than blue light.

Moreover, the frequency of an electromagnetic wave, f, is inversely proportional to the wavelength, [tex]\lambda[/tex]:

[tex]f=\frac{c}{\lambda}[/tex]

where c is the speed of light. This means that blue light, which has a shorter wavelength, has a higher frequency than red light.

-- turbulence

-- well mixed, non layered atmosphere

-- tornados

-- cumulonimbus clouds

-- thunderstorms

-- a lot of heavy clouds

Answer:

A

Explanation:

First of all the answer is less than the smallest resistor, so it is less than 18 ohms.

1 / r1 + 1/ r2 = 1/r

1/18 + 1/23.5 = 1/r

1/18 = 0.05555555

1/23.5 = 0.0422532

1/18 + 1/23.5 = 0.0555555 + 0.0422532

1/r = 0.0981087  

r = 1/0.0981087

r = 10.193

A

Final answer:

The equivalent resistance for two resistors in parallel, one with 18.0 ohms and the other with 23.5 ohms, is approximately 10.2 ohms, which is answer choice A.

Explanation:

When calculating the equivalent resistance for resistors in parallel, you use the formula 1/Req = 1/R1 + 1/R2 where Req is the equivalent resistance, and R1 and R2 are the resistances of the individual resistors. For the two resistors with resistances of 18.0 ohms and 23.5 ohms, the calculation would be:

1/Req = 1/18.0 + 1/23.5

1/Req = 0.0556 + 0.0426

1/Req = 0.0982

Req = 1 / 0.0982

Req ≈ 10.18 ohms

Therefore, the correct answer is A. 10.2 ohms.

Answer:

the current flowing in each is the same.

Explanation:

When resistors are connected in series, they are connected in the same branch of the circuit - this means that the same current flows through each resistor.

The other options listed are wrong because:

the same power is dissipated in each one --> false: the power dissipated in each resistor is [tex]P=I^2 R[/tex], where I is the current and R the resistance, so it depends on the value of the resistance

the potential difference across each is the same.-- > false: this is true in parallel circuits, not series circuits

the equivalent resistance of the circuit is less than that of the smallest resistor.--> false: the equivalent resistance of a series circuit is the sum of the individual resistances: [tex]R = R_1 + R_2 + ...[/tex], so it is larger than the resistance of the smallest resistance

the equivalent resistance of the circuit is equal to the average of all the resistances. --> false: the equivalent resistance of a series circuit is the sum of the individual resistances: [tex]R = R_1 + R_2 + ...[/tex], not the average

Ultraviolet light, whose wavelength is approximately between 100 nm and 380 nm; is a type of electromagnetic radiation that is not visible to the human eye.

This light is used for many purposes, among which is the identification of fluerescent minerals.

In this sense, fluorescence is a property that certain materials have in which they absorb energy in the form of short wavelength not visible electromagnetic radiation (the ultraviolet, for example) and then emit some of that energy in the form of longer wavelength electromagnetic radiation (in the visible spectrum). This is also called luminiscence.

Hence, the correct option is a.

Answer:

Mercury

Explanation:

The term is “ISOTOPES” These describe atoms with different atomic masses.

The term which describes different atomic masses of similar atom because of varying numbers of neutrons are Isotopes.

Explanation:

The isotopes are the chemical element which has different atomic masses due to the fact that number of neutrons are not same but it has same number of proton.

When the number of neutron increases in a nucleus, with the same electronic configuration and same number of proton, element is said to have isotopes. There are may be variants of isotopes of an element. For example, hydrogen has 3 isotopes.

Answer:

4 seconds

Explanation:

Average acceleration is change in velocity over change in time:

a = Δv / Δt

Δt = Δv / a

Δt = (15 m/s - 5 m/s) / 2.5 m/s²

Δt = 4 s

Answer: The time taken by the bicycle rider is 4 seconds.

Explanation:

To calculate the time taken by the rider, we use first equation of motion:

[tex]v=u+at[/tex]

where,

v = final velocity of the rider = 15 m/s

u = initial velocity of the rider = 5 m/s

a = acceleration of the car = [tex]2.5m/s^2[/tex]

t = time taken = ?

Putting values in above equation, we get:

[tex]15=5+(2.5\times t)\\\\t=\frac{15-5}{2.5}\\\\t=4s[/tex]

Hence, the time taken by the bicycle rider is 4 seconds.

Answer: [tex]90\°[/tex]

Explanation:

The Compton Shift [tex]\Delta \lambda[/tex] in wavelength when the photons are scattered is given by the following equation:

[tex]\Delta \lambda=\lambda_{c}(1-cos\theta)[/tex]     (1)

Where:

[tex]\lambda_{c}=2.43(10)^{-12} m[/tex] is a constant whose value is given by [tex]\frac{h}{m_{e}c}[/tex], being [tex]h[/tex] the Planck constant, [tex]m_{e}[/tex] the mass of the electron and [tex]c[/tex] the speed of light in vacuum.

[tex]\theta)[/tex] the angle between incident phhoton and the scatered photon.

We are told the maximum Compton shift in wavelength occurs when a photon isscattered through [tex]180\°[/tex]:

[tex]\Delta \lambda_{max}=\lambda_{c}(1-cos(180\°))[/tex]     (2)

[tex]\Delta \lambda_{max}=\lambda_{c}(1-(-1))[/tex]    

[tex]\Delta \lambda_{max}=2\lambda_{c}[/tex]     (3)

Now, let's find the angle that will produce a fourth of this maximum value found in (3):

[tex]\frac{1}{4}\Delta \lambda_{max}=\frac{1}{4}2\lambda_{c}(1-cos\theta)[/tex]      (4)

[tex]\frac{1}{4}\Delta \lambda_{max}=\frac{1}{2}\lambda_{c}(1-cos\theta)[/tex]      (5)

If we want [tex]\frac{1}{4}\Delta \lambda_{max}=\frac{1}{2}\lambda_{c}[/tex], [tex]1-cos\theta[/tex]   must be equal to 1:

[tex]1-cos\theta=1[/tex]   (6)

Finding [tex]\theta[/tex]:

[tex]1-1=cos\theta[/tex]

[tex]0=cos\theta[/tex]  

[tex]\theta=cos^{-1} (0)[/tex]  

Finally:

[tex]\theta=90\°[/tex]    This is the scattering angle that will produce [tex]\frac{1}{4}\Delta \lambda_{max}[/tex]      

super nova is named for such explosion

Answer:

supernova

Explanation:

gradpoint

Answer:

c) ability to store charge

Explanation:

The capacity of an object gives a measure of the ability of the object to store electric charge. In formula, it is defined as the ratio between the charge stored on the object and the electric potential on the object:

[tex]C=\frac{Q}{V}[/tex]

where

Q is the charge

V is the voltage

Therefore, an object with a larger capacity than another object means that if the two objects are at same voltage V, the first object can store more charge than the second object.

Capacitance measures an object's ability to store charge, and is dependent on the geometry of conductor arrangement and the dielectric properties between conductors. It is measured in farads, with one farad being equivalent to one coulomb of charge per one volt.

The property of objects that is best measured by their capacitance is their ability to store charge. A capacitor, which is an arrangement of objects that can store electrical energy due to their geometry, has a capacitance that is directly proportional to the electric potential energy it can store per unit electric potential. The capacitance of a system depends only on the geometry of the conductor arrangement and the physical properties of the dielectric between the conductors.

It is important to note that capacitance is not related to a material's ability to conduct electric current nor is it primarily about distorting an external electrostatic field. Instead, it defines how much charge can be separated for a given electric potential, that is, how much electric energy is stored or held in potential. The SI unit of capacitance is the farad (F), where 1 farad equals 1 coulomb (C) per 1 volt (V).

Answer:

Tundra Biome

Explanation:

Permafrost is a type of soil that is frozen all year round. It consists of rocks, soils and ice. The ice or frost holds the earth materials together.

The tundra biome lies below the arctic circle close to the north pole. Most of the earth here is predominantly frozen all year round. A layer of glacier covers  the surface and a deep lying layer of permafrost follows suit.

Some mountain tops capped with ice shows this tundra features.

Most tundras are termed cold deserts as they have little to no precipitation all year round. There is absence of vegetation cover as a result of low growing season of the plants.  

Answer:

They have a round shape

Explanation:

The gas giants which are the outer planets, and the terrestrial planets which are the inner ones have lot of differences between them. They have different sizes, different composition, different atmospheres, temperatures etc. But they also have something in common, which is pretty much the most obvious thing, they all have round shape. All of the planets have round shape, or rather they are slightly elliptical as they are more elongated around their equators, and slightly more flattened around their poles. This kind of shape has occurred because of these planets spin around their own axis, and around the Sun, thus the surface has become much smoother over time because of the friction.

Answer: they have a round shape

Explanation:

Answer:

d) 182 mm Hg

Explanation:

The ratio of partial pressure to total pressure is equal to the molar ratio.

P / 870 mm Hg = 0.21

P = 182 mm Hg

Answer is D.

Final answer:

At  an atmospheric pressure of 870 mm Hg with 21 percent oxygen, the partial pressure of oxygen is D) 182mm

Explanation:

The question is asking to calculate the partial pressure of oxygen in the atmosphere when the total atmospheric pressure is 870 mm Hg, given that oxygen constitutes 21% of the atmosphere. The partial pressure of oxygen (Po₂) is found by multiplying the total pressure by the percent content of oxygen in the mixture. This can be calculated as follows:

Po₂ = (870 mm Hg) × (0.21)

Therefore, the partial pressure of oxygen is:

Po₂ = 182.7 mm Hg

Since we only have whole numbers in the options provided, we round this to the nearest whole number, which is 183 mm Hg. This is not exactly one of the options given, so it seems there might be a typo in the choices; the closest correct answer would be 182 mm Hg.

Answer:

Is the equation for Ec=1/2 m(Dv)^2 where Dv is the difference between the angular speed & the areolar speed?

Answer: It seems i am made for this since, i LOVE eclipses, so basically it's when the moon goes in front of the moon, and is kinda hidden, making an eclipse

Hello There!

A partial solar eclipse is when the moon comes between the sun and our planet "Earth" but they do not align in a perfect straight line. Because of this, the moon only covers around half of the suns disc

Over the first 2.30 s, the wheel turns by angle [tex]\theta[/tex] according to

[tex]\theta=\left(20.0\dfrac{\rm rad}{\rm s}\right)t+\dfrac12\left(35.0\dfrac{\rm rad}{\mathrm s^2}\right)t^2[/tex]

so that after 2.30 s, it will have turned

[tex]\theta=138.575\,\mathrm{rad}[/tex]

Then the wheel turns a total of [tex]\theta+433\,\mathrm{rad}[/tex] over this entire interval, or [tex]572\,\mathrm{rad}[/tex].