Cooling systems, such as air conditioners and refrigerators, transfer thermal energy in order to keep homes and cars cool or to keep food cold. In a refrigerator, for example, thermal energy is transferred from the cool air inside the refrigerator to the warmer air in the kitchen. Thermal energy naturally moves from a warmer area to a cooler area, so how can it move from the cooler refrigerator to the warmer room?

Answer:

Relative dating involves the dating of geological events and

formations that occured/existed throughout the whole geological

history, and this eventually gives the relative age of the earth.

While, Absolute dating involves the use of isotopes and radioactive

elements (radioactivity) and also the study and relation of

meteorites and moon rocks, which eventually gives the   actual/absolute age of the earth. The meteorites and moon rocks are

believed to have formed virtually at the same time with earth and

are therefore, considered to be of the same age as earth.

Explanation:

Answer:

Absolute dating and relative dating are both methods used to determine the age of a fossil. Absolute dating gives the actual age of a fossil in years based on the amount of radioactive and stable elements in the fossil. Relative dating gives an estimate of the age of a fossil based on the location of the fossil in relation to other fossils.  

Explanation:

sample response

Answer:

Atacama Large Millimeter/Submillimeter Array (ALMA) Observatory's primary goal is to provide a radio telescope array that will allow scientists to observe and image galaxies out to the edge of the universe, and stars and planets in their formative stages with unprecedented clarity.

Explanation:

Answer:

- the location of dust and gases in space

- places where stars will be born

Explanation:

got it right on edmentum.

Answer:

4.988kW

Explanation:

According to the question, energy E extracted from the ocean breaker is directly proportional to the intensity I. It can be expressed mathematically as E ∝ I

E = kI where k is the constant of proportionality.

From the formula; k = E/I

This shows that increase in energy extracted will lead to increase in its intensity and vice versa.

If the device produces 10.0 kW of power on a day when the breakers are 1.20 m high

E = 10kW and I = 1.20m

k = 10/1.20

k = 8.33kW/m

To know how much energy E that will be produced when they are 0.600 m high, we will use the same formula

k = E/I where;

k = 8.33kW/m

I = 0.600m

E = kI

E = 8.33 × 0.6

E = 4.998kW

The device will produce energy of 4.998kW when they are 0.600m high.

Answer:

It will produce 2.5 Kw at 0.6m high

Explanation:

We are given;

Initial Power output of device; P_i = 10 Kw

Initial amplitude; A_i = 1.2m

Final Amplitude; A_f = 0.6m

We know that power is directly proportional to energy because

P = Energy(work done)/time taken

Thus; P ∝ E - - - - (eq1)

Now,from the question, we are told that Energy is proportional to the intensity. Thus;

E ∝ I - - - - (eq2)

where I is intensity

Now, from formula of Intensity, which is; I = (1/2)(ρ²•β²•ω²•A²)

We can see that I is directly proportional to square of Amplitude A²

Thus, I ∝ A² - - - - (eq3)

Combining eq 1,2 and 3,we can deduce that;

P ∝ E ∝ I ∝ A²

Thus, P ∝ A²

Now, let's set up the proportion as;

P_i/P_f = A_i²/A_f²

Since we are looking for final power, let us make P_f the subject.

So,

P_f = (P_i•A_f²)/A_i²

Plugging in the relevant values to obtain ;

P_f = (10 x 0.6²)/1.2² = 2.5 Kw

Answer: Option (b) is the correct answer.

Explanation:

Physical equilibrium is defined as a system in which there will occur no change in the physical state of substance. For example, at zero degree celsius water is present in both liquid and solid state as follows.

      [tex]H_{2}O(l) \rightleftharpoons H_{2}O(s)[/tex]

For a system to be present in physical equilibrium is as follows.

The system must be a closed system.

It should be dynamic in nature.

There will occur no change in measurable property along with change in time.

Thus, we can conclude that ice floats in water at [tex]0^{o}C[/tex] this an example of physical equilibrium because no new substances form when the water molecules change state.

Answer:

-5.8 m/s

Explanation:

Given:-

- The mass of Big Bubba, mb = 125 kg

- The mass of Lil' Pete, mp = 80 kg

- The initial velocity of Big Bubba, vb = 7 m/s

- The initial velocity of Lil Pete , vp = -10 m/s

- The velocity after impact of Lil' Pete, vp' = + 10 m/s

- The velocity after impact of Big Bubba = vb'

Find:-

what is  Big Bubba's velocity after the collision?

Solution:-

- We will consider the two football players as particles of mass mb and mp with their respective velocities vb and vp heading towards each other.

- The masses collide and both reverse in direction with velocities vb' and vp'.

- The system of the two masses have no external forces acting on it; hence, the system is isolated from any fictitious forces.

- For above conditions we can apply the principle of conservation of linear momentum. The linear momentum of two football players before ( Pi ) and after the impact ( Pf ) remain constant. The conservation is:

                             Pi = Pf

           mb*vb + mp*vp = mb*vb' + mp*vp'

           mb*vb + mp*( vp - vp' ) = mb*vb'

- Develop an expression for Big Bubba's velocity after impact vb':

           vb' = vb + mp/mb*( vp - vp' )

- Plug in the values and evaluate:

         vb' = 7 + 80/125*( -10 - 10 )

         vb' = 7 - 80*20 / 125

          vb' = -5.8 m/s  

Answer: The velocity of Big Bubba after impact is vb' = -5.8 m/s

Answer:10 hz

Explanation

A wave has a speed of 30 m/s and a wavelength of 3 meters then its frequency is 10 Hz.

Wave is is a disturbance in a medium that carries energy as well as momentum . wave is characterized by amplitude, wavelength and phase. Amplitude is the greatest distance that the particles are vibrating. especially a sound or radio wave, moves up and down. Amplitude is a measure of loudness of a sound wave. More amplitude means more loud is the sound wave.

Wavelength is the distance between two points on the wave which are in same phase. Phase is the position of a wave at a point at time t on a waveform.

There are two types of the wave longitudinal wave and transverse wave.

Longitudinal wave : in which, vibration of the medium (particle) is parallel to propagation of the wave. Sound wave is a longitudinal wave.

Transverse wave : in which, vibration of the medium (particle) is perpendicular to propagation of the wave. Light wave is a transverse wave.

Frequency of the wave is given by,

f = c/λ

f = 30/3 = 10 Hz

To know more about frequency :

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Answer:

Increases

Explanation:

Since power P=IV

Then it means when current increases, the power increases hence brightness increases. I represent current, P is power and v is voltage.

Current of capacitor when in series connection is given by

[tex]I=2\pi fCV[/tex]

where I is current across capacitor, f is frequency, C is capacitance and v is voltage across capacitance. From this second formula, it is evident that an increase in capacitance increases the current across the capacitor. Therefore, if current increases, power also increases leading to an increase in brightness

Increasing the capacitance in a series circuit with an AC source and a light bulb generally increases the bulb's brightness because it reduces the capacitive reactance and allows more current to flow through the bulb. So, the correct option is A.

When an AC source is connected to a series combination of a light bulb and a variable capacitor, the brightness of the bulb is affected by the capacitive reactance of the circuit, which is inversely proportional to both the frequency of the AC source and the capacitance of the capacitor.

As the capacitance is increased (considering the frequency of the AC source is constant), the capacitive reactance decreases. This allows more current to flow through the bulb, which generally increases the bulb's brightness.

Since capacitors in an AC circuit cause the current to lead the voltage, an increase in capacitance will mean that the current increases while the voltage across the capacitor does not change significantly. Therefore, the energy dissipated by the light bulb in the form of light (and heat) increases.

Answer:

False

Explanation:

the three types are transverse, longitude, and boundary

Answer:

The heater use 583 kWh of electrical energy per month.

Explanation:

Given that,

Power of the water heater, P = 550 watts

It is operated for 106 hours

The electrical energy used by the heater per unit time is called its power. So,

[tex]P=\dfrac{E}{t}\\\\E=P\times t\\\\E=5500\ W\times 106\ h\\\\E=583000\ Wh\\\\E=583\ kWh[/tex]

So, the heater use 583 kWh of electrical energy per month.

Answer:D

Explanation:

Answer:

d.

Explanation:

You really can't tell.

Power = I^2 × R = V^2 / R ( unit in Watt)

For P = I^2 × R

Where we have P directly proportional to R, increase in Power leads to increase in R

So if we have 100 will have higher resistance

For P = V^2/R

Power is inversely proportional to resistance.

So increase in Power leads to decrease in resistance.

60 watt will have a higher resistance.

Answer:

Black color absorbs heat more quickly and it also emits heat at a faster rate.

Whereas silver is one of the best conductor of heat and electricity. Therefore, it absorbs heat more quickly but it does not emit heat at a faster rate.

Therefore, we can conclude that the statement black pot emits heat at a faster rate than the silver pot best explains that black pot is significantly cooler than the water in the silver pot.

Explanation:

Hope this helps :)

Final answer:

The black pot cools faster than the silver pot because black emits infrared radiation more efficiently, thereby losing heat quicker.

Explanation:

The difference in the temperature of the water in the two identical pots, one black and the other silver, after being heated and left to cool in the same room, can be explained by the properties of radiative heat transfer. Darker colors, especially black, are known to radiate heat more efficiently than lighter colors. This means that the black pot will emit more infrared radiation than the silver pot and thus cool down faster. Both pots start at the same temperature, and given identical conditions aside from color, the differing cooling rates are due to how effectively each color emits heat as radiation.

Answer:

i think its true

Explanation:

Polarization is the non-symmetrical distribution of charges within a neutral object, and it does not mean that the object becomes charged.

The statement, "When an object becomes polarized, it acquires a charge and becomes a charged object," is false. Polarization is the separation of positive and negative charges within an inherently neutral object. For example, consider two metallic spheres that are neutral. When a charged glass rod is approached to the spheres, it induces a negative charge on the side nearest to the rod, leaving the other side of the spheres positively charged. However, the spheres as a whole remain electrically neutral. This is an instance of induced polarization.

It's also crucial to understand that charging by polarization does not require direct contact with a charged object. When the spheres are separated before the charged rod is removed, each sphere will have a net charge, which is the result of charging by induction, not by transfer of charge through contact. This process can be repeated multiple times without depleting the excess charge on the rod, emphasizing the non-contact nature of the process.

Answer: to win the game by at least two points. If the score reaches 20–20, then 21 points are no longer enough to win the game. You need to win two clear points: two points in a row, one after the other. For example, 22–20 would be a winning score, as would 25–23.

Explanation:    you need a lot of points to be won

your welcome

In badminton, a game is won by a player or team reaching a specific number of points first with a 2-point lead.

Badminton is a racquet sport played either as singles or doubles, with the objective of hitting a shuttlecock over a net to the opponent's side. It requires agility, speed, and hand-eye coordination and is popular for recreational play and competitive tournaments worldwide. In badminton, a game is won by a player or team reaching a specified number of points first. In singles, the first player to reach 15 points wins, while in doubles, the first team to reach 21 points wins.

However, in order to win, a player or team must also have a lead of at least 2 points. This means that if both players or teams reach the required number of points simultaneously, the game continues until one player or team has a 2-point lead. In addition, there are specific rules regarding serving and scoring that players must follow to win a badminton game.

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Answer:

An example of kinetic energy due to gravity can be a ball held in the air (Kinetic energy is energy an object has because of it's motion.).

Explanation:

Answer:

4. C, B, D, A

Explanation:

This is a simple experiment to make electromagnets. Electromagnets are the instrument/object which behave like magnet when electricity is passed around them. As long as electricity is supplied they will behave like magnet. When the electricity is stopped, they will no longer behave like magnet.

The correct sequence, as per the question, to make electromagnet are listed below:

Wrap a wire to create loops around a piece of metal, such as iron. (As of now it will not behave like magnet)

As soon as we close the circuit, current starts flowing through the loops and generate magnetic field.

This magnetic field forces the magnetic domains inside metal piece to align  and the metal starts behaving like a magnet.

Answer:

This is as a result that about the central axis a collapsed hollow cone is equivalent to a uniform disc

Explanation:

The integration of the differential mass of the hollow right circular cone yields

[tex]I=\int\limits dmr^2 = \int\limits^a_b {\frac{2Mxr^2}{R^2 +H^2} } \, dx = \frac{2MR^2dx}{(R^2 +H^2)^2} \frac{(R^2 +H^2)^2}{4} = \frac{1}{2}MR^2[/tex]

and for a uniform disc

I = 1/2πρtr⁴ = 1/2Mr².

Final answer:

Both a uniform disc and a hollow right circular cone have the same formula for their moment of inertia when rotating about the central axis because their shapes and mass distributions result in similar rotational behavior.

Explanation:

Both a uniform disc and a hollow right circular cone have the same formula for their moment of inertia when rotating about the central axis because their shapes and distributions of mass result in similar rotational behavior.

The moment of inertia depends on the distribution of mass around an axis of rotation. In both objects, the mass is distributed symmetrically about the central axis, resulting in similar moment of inertia values.

For a uniform disc, the moment of inertia is given by the formula I = 1/2 MR², where M is the mass of the disc and R is its radius. Similarly, for a hollow right circular cone, the moment of inertia is also given by the formula I = 1/2 MR², where M is the mass of the cone and R is the radius of its base.

Answer:

Steam-methane reforming

Electrolysis of water

Explanation:

Steam methane reforming involves reaction of methane with water in the presence of a catalyst such as nickel to form Carbon oxides and Hydrogen.

CH4 + H2O ⇌ CO + 3 H

Electrolysis of water involves splitting of water through application of electric current to give Hydrogen and Oxygen gas.

2 H2O(l) → 2 H2(g) + O2(g)

Hydrogen gas for fuel cells is commonly produced through steam reforming and electrolysis. In steam reforming, steam is passed over coke to produce hydrogen and carbon monoxide. In electrolysis, water is split into hydrogen and oxygen gases with a power supply.

The two most common ways to produce hydrogen gas used in fuel cells are through steam reforming and electrolysis. Steam reforming involves passing steam over coke at high temperatures, which produces a mixture of carbon monoxide and hydrogen gas, also known as water gas.

In the electrolysis process, water is split into hydrogen and oxygen gases by the addition of energy using a battery or power supply. For fuel cells, hydrogen obtained from these processes is continuously fed into the cell with an oxidant and undergoes redox chemistry that generates electrical energy and water as the waste product. The fuel cell reactions are catalyzed on graphite electrodes embedded with platinum-based catalysts.

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Answer:

Red

Explanation:

Red is a colour which has the lowest frequency. Violet has the highest frequency. Frequency has a direct relationship with energy. This means the higher the frequency, the higher the energy. Red has the lowest energy of all the colors too.

The frequency and Energy has an inverse relationship with the wavelength.

However Red has the longest wavelength of about 620 - 780 nanometer.

Answer:

[tex]0.0112 \Omega[/tex]

Explanation:

The resistance of an object tells us how much the object opposes to the flow of current through it.

The resistance of a conductor is given by the formula

[tex]R=\frac{\rho L}{A}[/tex]

where

[tex]\rho[/tex] is the resistivity of the material

L is the length of the conductor

A is the cross-sectional area

For the tungsten rod in this problem, we have:

L = 20.0 m is the length

[tex]A=1.00\cdot 10^{-4}m^2[/tex] is the cross-sectional area

[tex]\rho=5.6\cdot 10^{-8} \Omega \cdot m[/tex] is the resistivity of tungsten at 20C

Substituting into the formula, we find the resistance of the tungsten rod:

[tex]R=\frac{(5.6\cdot 10^{-8})(20.0)}{1.00\cdot 10^{-4}}=0.0112 \Omega[/tex]

Answer:

Magnetism

Explanation:

The carpenter can separate the iron nails from the plastic nails using a magnet. The iron nails have magnetic properties therefore they would be attracted to the magnet living only the plastic nails. This process is known as magnetic separation because it is based on the physical properties of the mixed components separating a mixture of components containing magnetic and non magnetic materials.

Answer:

[tex]-20.0 kg m^2/s[/tex]

Explanation:

The angular momentum of an object in rotation is given by

[tex]L=I \omega[/tex]

where

I is the moment of inertia

[tex]\omega[/tex] is the angular speed

In this problem, initially we have

[tex]I=2 kg m^2[/tex] is the moment of inertia of the wheel

[tex]\omega_i = 6.0 rad/s[/tex] is the initial angular speed

So the initial angular momentum is

[tex]L_i = I\omega_i = (2)(6.0)=12 kg m^2/s[/tex]

Later, a counterclockwise torque of

[tex]\tau=-5.0 Nm[/tex] is applied

So the angular acceleration of the wheel is:

[tex]\alpha = \frac{\tau}{I}=\frac{-5.0}{2}=-2.5 rad/s^2[/tex] in the direction opposite to the initial rotation.

As a result, the final angular velocity of the wheel will be:

[tex]\omega_f = \omega_i + \alpha t[/tex]

where

t = 4.0 is the time interval

Solving,

[tex]\omega_f = +6.0 +(-2.5)(4.0)=-4 rad/s[/tex]

which means that now the wheel is rotating in the counterclockwise direction.

Therefore, the new angular momentum of the wheel is:

[tex]L_f = I\omega_f =(2)(-4.0)=-8.0 kg m^2/s[/tex]

So, the change in angular momentum is:

[tex]\Delta L=L_f - L_i = (-8.0-(12))=-20.0 kg m/s^2[/tex]

Answer:

1.250

Explanation:

Answer:

[tex]1.11\times10^{-4} C[/tex]

Explanation:

Coulomb's force:

[tex]F=\frac{kqq'}{d^2}[/tex]

where, q and q' are two charges, d is the distance between them and k is the Coulomb constant.

The net force on charge q at origin is 17 N.

[tex]17 = 9\times 10^9 \times 8.5\times10^{-6}[\frac{-28\times 10^{-6}}{0.21^2}+\frac{q_2}{0.36^2}]\\17 = 76.5 \times 10^3[-6.35 \times 10^{-4}+7.72q_2]\\q_2 = 1.11\times10^{-4} C[/tex]

Answer:

5.35 x 10^-5 C

Explanation:

q1 = - 28 micro Coulomb =- 28 x 10^-6 C

q2 = ?

q3 = 8.5 micro Coulomb = 8.5 x 10^-6 C

y1 = 0.21 m

y2 = 0.36 m

q3 is at origin.

Let F1 is the force between q1 and q3 and F2 is the force between q2 and q3.

By use of Coulomb's law, the force between the two charges is given by

[tex]F = \frac{Kqq'}{r^{2}}[/tex]

Now, [tex]F_{1} = \frac{Kq_{1}q_{3}}{0.2^{2}}[/tex]

[tex]F_{1} = \frac{9\times 10^{9}\times 28\times 10^{-6}\times 8.5\times 10^{-6}}{0.21^{2}}[/tex]

F1 = 48.6 N    .... (1)

Now, [tex]F_{2} = \frac{Kq_{2}\times q_{3}}{0.36^{2}}[/tex]

[tex]F_{2} = \frac{9\times 10^{9}\times q_{2} \times 8.5\times 10^{-6}}{0.36^{2}}[/tex]

F2 = 590277.78 q2   .... (2)

Now, F1 - F2 = 17

48.6 - 590277.78 q2 = 17     from (1) and (2)

q2 = 5.35 x 10^-5 C

Thus, the charge on q2 is 5.35 x 10^-5 C.  

Answer:

Explanation:

Lightning is seen before the thunder is heard because , velocity of light exceeds velocity of sound. We also know that velocity , wavelength and frequency are related as follows

velocity = frequency x wavelength

velocity of light > velocity of sound

frequency of light x wavelength of light > frequency of sound x wavelength of sound

But given wavelength of light = wavelength of sound

Putting this relation in the equation above

frequency of light x wavelength of light > frequency of sound x wavelength of light

cancelling out equal terms on both sides

frequency of light  > frequency of sound

frequency of light will be greater than frequency of sound.

Answer:

the frequency of thunder is more than the frequency of lightning

Explanation:

Light waves (lightning) are faster than sound waves (thunder). If their wavelengths are the same, then the frequency of light waves must be larger

Answer:

7.33 rounded

Explanation:

Speed = distance divided time

S = d/t

Suppose a Rollerblade racer finished a 132 meter race in 18 seconds. What is the average speed of the Rollerblade racer?

S = 132 divided 18

Speed = 7.33 rounded

Answer: 7.3 meters a second

Explanation: 132/18=7.3

Answer:

Energy is inversely proportional to wavelength.

Explanation:

The amount of energy, E, a wave carries is given as:

E = hf

where h = Planck's constant and f = frequency of the wave

Frequency and wavelength are related by the equation:

c = λf

=> f = c/λ

where λ = wavelength

Therefore, energy is:

E = hc/λ

This shows that energy is inversely proportional to wavelength. As wavelength increase, energy decreases and vice versa.