Which portion of the electromagnetic spectrum is used in a television

Answer:

0.0129 V

Explanation:

The average emf induced in the coil is given by Faraday-Newmann-Lenz:

[tex]\epsilon=-\frac{\Delta \Phi_B}{\Delta t}[/tex]

where

[tex]\Delta \Phi_B[/tex] is the variation of magnetic flux through the coil

[tex]\Delta t = 15 s[/tex] is the time interval

Here we have

B = 0.50 T is the strength of the magnetic field

The radius of the coil is

r = 35 cm = 0.35 m

So the area is

[tex]A=\pi r^2 = \pi (0.35 m)^2=0.385 m^2[/tex]

The initial flux through the coil is

[tex]\Phi_i = BA = (0.50 T)(0.385 m^2)=0.193 Wb[/tex]

while the final flux is zero, since the coil has been completely removed from the magnetic field region; so, the variation of magnetic flux is

[tex]\Delta \Phi = \Phi_f - \Phi_i = -0.193 Wb[/tex]

and so, the average emf induced is

[tex]\epsilon=-\frac{-0.193 Wb}{15 s}=0.0129 V[/tex]

Given:

u = 8.5 cm

f = -14.0 cm

v = image distance

Using the mirror formula 1/u + 1/v = 1/f

1/8.5 + 1/v = 1/-14.0

Rewrite to solve for v:

v = (8.5 * -14.0) / (8.5 - (-14.0))

v = -119 / 22.5

v = -5.29 cm  ( round answer as needed.)

Answer:

False

Explanation:

Geothermal pumps can be used for cooling and heating.

Answer:

color; brightness

Explanation:

Astronomers use the color of stars to determine how hot they are and their brightness to estimate how far away they are.

Astronomers use the color of stars to determine how hot they are and their brightness to estimate how far away they are.

A scientist who concentrates their research on a particular issue or area outside the purview of Earth is called an astronomer in the science of astronomy.

They perform observational (by evaluating the data) or theoretical astronomy when observing astronomical objects including stars, planets, moons, comets, and galaxies.

Planetary science, solar astronomy, the creation or evolution of stars, or the formation of galaxies are a few examples of subjects or domains that astronomers investigate.

Therefore, Astronomers use the color of stars to determine how hot they are and their brightness to estimate how far away they are.

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The reason why there is an abundance of metamorphic rocks in the southwestern part of Mexico is the intense geologic activity in this area. In this area there is geologic activity triggered by the convergent plate boundary of the North American plate and the Cocos plate. The Cocos plate subducts bellow the North American plate, and that causes the surrounding crust to be exposed to high temperatures and pressures. Those high temperatures and pressure lead to metamorphism of the rocks that are deep into the crust. Also, the land is lifted up because of the subduction zone, so these metamorphic rocks start to emerge on the surface or very close to it because they have been pushed upwards.

Answer:

= 129.06 moles

Explanation:

Using the ideal gas equation;

PV = nRT

Where; P is the pressure, V is the volumes, n is the number of moles, R is the ideal gas constant and T is the temperature.

In this case; V = 12.5 L, P = 25325 kpa or 249.94 atm, T = 22 + 273 = 295 K and R= 0.08206L atm/mol K

n = PV/RT

 = (12.5 × 249.94)/(0.08206 × 295)

 = 129.06 moles

Answer:

4.5 m/s

Explanation:

Initial momentum = final momentum

0 kg m/s = (15 kg) (3.0 m/s) + (10.0 kg) v

v = -4.5 m/s

The negative sign means it's moving in the opposite direction.

Answer:

4.5

Explanation:

4.5

A pulsar (pulsating star)   is a neutron star that emits very intense jets of electromagnetic radiation in the range of radio waves, X-rays or gamma rays, at short and periodic intervals due to its intense magnetic field that induces this emission.

This jet is "observable" on Earth, when the magnetic pole of the star "points" to our planet and then stops pointing a thousandth of a second later due to the fast rotation of the star, appearing again when the same pole returns to point towards Earth.

Then, what is observed in the terrestrial sky are pulses of radiation with a very exact period, which are repeated again and again.

The radio pulses of a pulsar are produced due to its spinning action. As the star spins, it emits beams of radio radiation that sweep through space. We observe these as pulses when they point towards Earth.

The radio pulses of a pulsar are produced by the spinning of the star. As the star spins, it emits beams of radio radiation that sweep through space. If one of these beams points toward Earth, we observe it as a pulse.

The other options provided are not the reasons behind the radio pulses of a pulsar. These radio pulses are not due to the star vibrating or undergoing nuclear explosions. Similarly, it's not the star's dark orbiting companion periodically eclipsing the radio waves nor a black hole near the star absorbing energy and re-emitting it as radio pulses.

So, the correct answer to this question is option (b): As the star spins, beams of radio radiation from it sweep through space. If one of these beams points toward Earth, we observe a pulse.

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Answer:

They are rechargeable

They have a longer life span

They are reusable

Explanation:

Lead acid accumulators and leclanche cells are types of electrochemical cells.

Leclanche cells are primary cells. Primary cells produce chemical reactions through which the electric current generated is irreversible.

Lead Acid Accumulators are secondary cells in which electric current generated is reversible.

This makes lead acid accumulators reusable, more durable and they have a longer life span.

The two advantages of a lead-acid accumulator over a Leclanché cell are its rechargeability and its higher current output, which makes it suitable for applications such as starting car engines.

There are two main advantages of a lead-acid accumulator (also known as a lead-acid battery) over a Leclanché cell.  

It is important to note that, despite these advantages, lead-acid batteries contain a significant amount of lead and a caustic liquid electrolyte, both of which must be handled and disposed of properly due to their environmental impact.

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They have different amount of neutrons

Answer:

They have different amounts of neutrons.  They have different mass numbers.

Answer:

a. the force between them quadruples

Explanation:

The electrostatic force between two charges is given by

[tex]F=k\frac{q_1 q_2}{r^2}[/tex]

where

k is the Coulomb's constant

q1 and q2 are the two charges

r is the separation between the two charges

In this problem, the charges on both objects are doubled, so

[tex]q_1' = 2q_1\\q_2' = 2q_2[/tex]

While the distance does not change, so the new force will be

[tex]F'= k \frac{(2q_1)(2q_2)}{r^2}=4 (k\frac{q_1 q_2}{r^2})=4 F[/tex]

so, the force will quadruple.

Answer: B) wave nature of light

Two positively charged balls will repel with greater force as the charge on one of them is increased. Grounding the second ball would cause it to lose its charge, making both balls positively charged after the process, with reduced repulsion between them.

When one ball is kept positively charged and the charge on the other ball is increased, making it more positive, the two balls will repel each other with greater force. This phenomenon is due to Coulomb's Law, which states that the force between two point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.

If the second ball, which is also positively charged, is momentarily grounded while a negatively charged rod is nearby, it would lose its negative charge to the ground. This is because grounding provides a path for the charge to dissipate into the Earth, effectively neutralizing the charged object. After being ungrounded, if the negatively charged rod is still present, the second ball will have a positive charge due to the removal of its excess electrons. Therefore, both balls would end up with a positive charge, but the magnitude of the charge on the second ball would be reduced by the grounding process, potentially changing the dynamics of their interaction.

The charge on the first ball will remain positive throughout this process, as the presence of the negatively charged rod induces the transfer of electrons from the first ball to the second ball when they are in contact, leaving the first ball positively charged.

The answer is:North South North South.

Hope this helped :)

Answer: North, south, north, south.

Explanation:

In a usual magnetic field diagram, the vectors of the field "come" from the north pole and "enter" in the south pole.

In this case, we can see from where the field comes by the small arrows in the field lines, so in the figure the poles are:

North, South, North, South.

Where in the middle, the south pole of the left magnet is receiving the field that comes from the north pole in the other magnet, and the same for the outer poles.

The statement 'For every action there is an equal and opposite reaction' is true as per Newton's third law. This law indicates that any force exerted on a body will lead to an equivalent counter force from that body. These forces apply to separate bodies and do not cancel each other out.

The statement 'For every action there is an equal and opposite reaction' is True. This principle is known as Newton's third law. As per this law, any force enacted upon a body will cause that body to exert an equivalent force in the opposite direction - an 'action-reaction' pair. For instance, if you push a wall, the wall pushes back with an equivalent force. Importantly, these forces act on separate bodies and therefore do not cancel each other out.

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Newton's third law states that for every action, there is an equal and opposite reaction. Understanding this law is crucial in physics for analyzing interactions between objects and systems to predict motion based on forces.

Newton's third law states that for every action, there is an equal and opposite reaction. This means that when one object exerts a force on another object, the second object will exert a force of equal magnitude but in the opposite direction.

This law explains the concept of action-reaction pairs, where the forces between two interacting objects are always equal and opposite. An example of this is when you push against a wall, the wall pushes back with an equal force in the opposite direction.

Understanding Newton's third law is essential in physics to analyze the interactions between objects and systems and to predict their motion based on the forces involved.

Your Answers:

1: C. Weather Services

2: B. Seaweed

3: C. He developed a particularity narrow ship (I think.)

4:  True The founder/creator of the first echo sounder was German inventor, Alexander Behm.

5: B. The solution favors human needs over environmental. (I think.)

6: True (I think)

7: C. Polar bears and Walruses (I think.)

8: B. A single approach in every situation (I think)

9: A. Most pollution occurs in the ocean

10: A. Walrus Definition of a pinniped: a carnivorous aquatic mammal of the order <i>Pinnipedia</i>, such as a seal or walrus.

11: D. Water conditions around coral reefs (I think)

12: True

13: A. Coastal regions (I think)

Sorry if any of them are incorrect. Some of these I am unsure of how to answer. Hope I helped you,

-Anime.

Answer:

1.C.

2: B.

3: C.

4:  ?

5: B.

6: True

7: C.

8: B.

9: A.

10: A..

11: D.

Explanation:

The water pushes the shower curtain. Push is a force. The water basically thrusts the shower curtain and the curtain will then not stop immediately as it has a bit of braking distance. Then braking distance differs on the total force the water has on the curtain. Simple way: The curtain moves because the water acts as a push to propel the curtain forwards.

Your shower curtain swings towards you when the water is on full blast due to a principle of physics involving pressure variations in rapidly moving fluids. The high-velocity water and air create lower pressure inside the shower, and with standard atmospheric pressure outside the shower, a net inward force results, causing the curtain to swing in.

This phenomenon is explained with the principles of physics and more specifically, fluid dynamics. When you have the shower on full blast, a high-velocity stream of water and air is created, which result in a region of lower pressure inside the shower. On the other side of the curtain, the pressure remains at standard atmospheric pressure. This difference in pressure results in a net force that pushes the curtain inward. This interaction with rapidly moving fluids and pressure is the reason why your shower curtain swings or bulges towards you when the water is at full blast. It is similar to the effect observed when passing a truck on the highway, where your car tends to veer towards it - the high velocity of air between the car and the truck creates a region of lower pressure, and the vehicles are pushed together by greater pressure from the outside.

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If you want to increase the Capacitance of Parallele Plate Capacitor then increase the surface area, reduce the separation between the plate and use a dielectric material in between the plate which have higher dielectric breakdown strength.

1.) D.electric charge 2.) B. Conduct the lighting away from the house

The first answer is actually A, conductor

Answer:

The word "gravity" refers to the force that pulls an object to another object. More specifically, it is the force that the Earth or another heavenly body exerts on people or objects, pulling them toward it.

Explanation:

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(a) The total energy increases by a factor 4

The total energy of a simple harmonic system is given by:

[tex]E=\frac{1}{2}kA^2[/tex]

where

k is the spring constant

A is the amplitude of the motion

In this part of the problem, the amplitude is doubled:

A' = 2A

So the new total energy is

[tex]E=\frac{1}{2}k(A')^2=\frac{1}{2}k(2A)^2=4(\frac{1}{2}kA^2)=4E[/tex]

So, the energy quadruples.

(b) The maximum speed increases by a factor 2

The maximum speed in a simple harmonic motion is given by

[tex]v=\omega A[/tex]

where

[tex]\omega=\sqrt{\frac{k}{m}}[/tex] is the angular frequency, with k being the spring constant and m the mass

A is the amplitude

In this part of the problem, k and m do not change, so the angular frequency does not change. Instead, the amplitude is doubled:

A' = 2A

So the new maximum speed is

[tex]v'=\omega (A')=\omega (2A)=2 (\omega A)=2 v[/tex]

so, the maximum speed doubles.

(c) The maximum acceleration increases by a factor 2

The maximum acceleration in a simple harmonic motion is given by

[tex]a=\omega^2 A[/tex]

where

[tex]\omega=\sqrt{\frac{k}{m}}[/tex] is the angular frequency, with k being the spring constant and m the mass

A is the amplitude

In this part of the problem, k and m do not change, so the angular frequency does not change. Instead, the amplitude is doubled:

A' = 2A

So the new maximum acceleration is

[tex]a'=\omega^2 (A')=\omega^2 (2A)=2 (\omega^2 A)=2 a[/tex]

so, the maximum acceleration doubles.

(d) The period does not change

The period in a simple harmonic motion is given by

[tex]T=2\pi \sqrt{\frac{m}{k}}[/tex]

where m is the mass and k is the spring constant.

In this problem, the amplitude is doubled:

A' = 2A

However, we notice that the period does not depend on the amplitude, and since both m and k do not change, then the period will remain constant.

Final answer:

Doubling the amplitude in simple harmonic motion quadruples the total energy, doubles both the maximum speed and maximum acceleration, while the period remains unchanged. If the spring constant is doubled, the mass must be doubled to keep the same frequency.

Explanation:

Impact of Doubling the Amplitude on Simple Harmonic Motion

When the amplitude A of a system undergoing simple harmonic motion (SHM) is doubled, the following changes occur:

(a) Total energy of the system, which includes both kinetic and potential energy, is proportional to the square of the amplitude. Therefore, doubling the amplitude results in quadrupling the total energy (a factor of 4).

(b) Maximum speed (Vmax) of the system in SHM is directly proportional to the amplitude. As a result, doubling the amplitude doubles the maximum speed (a factor of 2).

(c) Maximum acceleration is also directly proportional to the amplitude. By doubling the amplitude, the maximum acceleration is also doubled (a factor of 2).

(d) The period of oscillation (T) is independent of the amplitude and will remain unchanged.

If the spring constant (k) of a simple harmonic oscillator is doubled, the mass (m) of the system needs to be doubled as well, in order to maintain the same frequency of motion, based on the formula for the frequency f = 1/(2π√(m/k)).

For instance, in an alkaline battery, the anode is typically made of zinc, and manganese dioxide acts as the cathode. And the electrolyte between and inside those electrodes contains ions. ... These free electrons congregate inside the anode (the bottom, flat part of an alkaline battery)

Hope this helps:)

The anode is usually made of zinc, while the cathode is manganese dioxide. The anode is a negative electrode related with oxidation or electron release.

An alkaline battery  is a main battery that gets its power from the reaction of zinc metal and manganese dioxide.

Alkaline batteries provide a better energy density and a longer shelf life than zinc chloride batteries.

The anode is  a negative electrode related with oxidation or electron release. The anode is the negative pole during discharge and the positive pole during charge in a rechargeable cell.

Hence, the anode is typically made of zinc, while the cathode is manganese dioxide.

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Answer:

In a transformer, if the secondary coil contains more loops than the primary coil, then it is a step-up transformer.

Explanation:

Answer:

There are two correct options.

1. A transformer is used to increase or decrease an alternating current voltage.

2. In a transformer, if the secondary coil contains more loops than the primary coil, then it is a step-up transformer.

Explanation:

A transformer is a device which has two coils. One is primary coil and other is secondary coil.

Input is given to primary coil and output is taken out from secondary coil.

A transformer can increase or decrease the output voltage by setting the number of turns in primary and secondary coil.

If the number of turns in primary coil is less than the number of turns in secondary coil, then it is step up transformer. It increases the output voltage.

The relation between the number of turns and the voltage is given by

[tex]\frac{N_{s}}{N_{p}}=\frac{V_{s}}{V_{p}}=\frac{I_{p}}{I_{s}}[/tex]

Where, Np = number of turns in primary coil

Ns = number of turns in secondary coil

Vp = ac voltage across primary coil

Vs = ac voltage across secondary coil

Ip = ac current across primary coil

Is = ac current across secondary coil

Answer:

2.5s

Explanation:

Given parameters:

Decay constant of the nuclide = 4.6 x 10⁻³s⁻¹

Unkown:

Half life =?

The half life is the time take for half of the radioactive nuclei to disintegrate. It is mathematically expressed as:

Half life = 0.693/λ

Where λ is the decay constant

Since we have been given λ we plug it into the equation:

Half life = 0.693/4.6 x 10⁻³

Half life = 0.693/0.0046

Half life =150. 65s

Now we convert to minutes because the options are in minutes:

60s = 1 minute

150.65s = 150.65/60 = 2.5s

The half life of the nuclide is 2.5s

Answer:

C

Explanation:

When you watch television it is a form of radiation and radio waves is radiation.

Television uses radio waves, specifically those in the radio frequency (RF) range of the electromagnetic spectrum. Option C is correct.

Wavelength is a fundamental property of waves, including electromagnetic waves like light and radio waves, as well as other types of waves, such as sound waves or water waves.

Here,
Television uses radio waves, specifically those in the radio frequency (RF) range of the electromagnetic spectrum.

Television signals are transmitted from a broadcasting station to a television set via radio waves that are modulated to carry audio and video information. These radio waves fall in the range of frequencies between 47 MHz and 862 MHz for terrestrial television broadcasts. Cable and satellite television transmissions use higher frequencies in the gigahertz (GHz) range.

Infrared waves are used in remote controls, X-rays are used in medical imaging, and gamma waves are used in cancer treatments and industrial applications. None of these are used in television broadcasting.

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Answer:

2.14 kW, I₂ < I₁

Explanation:

The three resistors are in parallel.  The net resistance is:

1/R = 1/R₁ + 1/R₂ + 1/R₃

1/R = 1/20 + 1/8 + 1/500

1/R = 0.177

R = 5.65

The power is:

P = IV

P = (V/R) V

P = V²/R

P = (110)² / 5.65

P = 2140 W

P = 2.14 kW

For two resistors in parallel, the one with the higher resistance has the smaller current.  I₂ < I₁.

yes it is just like a sonar ping can cancel another ping it works the same way as a normal soundwave

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Answer: C) divide: distance ÷ velocity

Explanation:

The velocity [tex]V[/tex] equation is distance [tex]d[/tex] divided by time [tex]t[/tex]:

[tex]V=\frac{d}{t}[/tex]

If we isolate [tex]t[/tex] we will have:

[tex]t=\frac{d}{V}[/tex]

Hence, the correct option is C: distance divided by velocity.

Answer:

C) it moves in the same direction as the force  

D) The object moves in the opposite direction of the force

Explanation:

As we know by work energy theorem that when work is done on the system of mass then

[tex]W_{net} = KE_f - KE_i[/tex]

now as per the definition of work done we know that

[tex]W = F.d[/tex]

[tex]W = Fdcos\theta[/tex]

so here we will say that when force is applied in the direction of the displacement of the object then it is always positive work and if work is applied in the opposite direction of the displacement of object then it is always negative work.

So here when force is applied then the point of application must move either in the direction of force or in the opposite direction of the force.

so correct answer will be

C) it moves in the same direction as the force  

D) The object moves in the opposite direction of the force

Current flow in light bulbs varies between series and parallel circuits; in a series, the current is consistent but the voltage is divided, while in parallel, each bulb receives the full voltage with the total current being split among them.

When two light bulbs are connected in a series circuit, the current flows through the first light bulb and then into the second. This means that the same current flows through both bulbs. However, the voltage across each bulb is divided, which may result in both bulbs being dimmer than if they were connected separately to a voltage source. Thus, in a series circuit with a single battery source, two light bulbs would appear half as bright compared to if they were connected individually to the battery.

In contrast, two light bulbs connected in a parallel circuit have the same voltage applied to them as the source voltage. This is because each bulb is connected directly to the power supply on its own parallel path. Therefore, each light bulb receives the full voltage from the source and they will shine as bright as they would individually. However, the current drawn from the source is divided between the bulbs, with each having its separate current flow. This parallel arrangement will cause the battery to drain more quickly as it is supplying full energy to both bulbs concurrently.

Using the analogy of water flowing through hoses, a series circuit is akin to water traveling through a single hose where the current (amount of water) remains constant, whereas a parallel circuit is like having multiple hoses with the same pressure (voltage) applied, causing more water (current) to flow overall.