When sand absorbs the electromagnetic waves of the Sun, it becomes warm through the process of______.

radiation


conduction


convection


evaporation

Answer:

Tension force.

Explanation:

Because to exert force from each other.

Observation– the process of using the five senses to gather information

Your average velocity was zero, thus choice (b) will be accurate.

Let x be the separation between my home and my friend's home. I leave my home and travel to my friend's home, where I spend some time. I then return home after that. My initial position and final position are identical, hence there is no displacement.

However, the following determines how far my car travels: d = 2x.

Let t represent the whole amount of time it takes me to travel from home to home. My instantaneous velocity will be zero at my friend's place because I spent some time there. The average velocity will be given by: Because the total displacement is zero, the average velocity will be:

\(V_{avg} = \frac{8}{t}=0\)

The acceleration changed as I traveled and stayed at a friend's house; it was never continuous. My average speed as I covered a distance of d=2x is shown by: \(v^{'}_{avg} = \frac{d}{t} = \frac{2x}{t}\)

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The 1100 lm light bulb could be placed approximately 2.24 m away and still provide the same illuminance as the 800 lm light bulb at 2 m.

The total amount of energy emitted by a star or other celestial object per second is expressed as luminosity, abbreviated L. So, this is how much power a star produces. A star's bolometric luminosity is its total power output at all wavelengths.

Illuminance is the measure of the amount of light that falls on a surface per unit area, and it is given in units of lux (lx).

The illuminance E at a distance d from a point light source of luminous flux Φ (in lumens) is given by the formula:

E = Φ / (4πd²)

In this problem, we are given the luminous flux of two light bulbs and the distance of one of them, and we need to find the distance at which the illuminance is the same for both.

For the 800 lm bulb at a distance of 2 m, the illuminance is:

E1 = 800 lm / (4π(2 m)²) = 25.45 lx

To find the distance at which the 1100 lm bulb provides the same illuminance, we can set E₂ = E₁ and solve for d:

1100 lm / (4πd²) = 800 lm / (4π(2 m)²)

Simplifying, we get:

d = √(1100/800) * 2 m

d ≈ 2.24 m

Therefore, the 1100 lm light bulb could be placed approximately 2.24 m away and still provide the same illuminance as the 800 lm light bulb at 2 m.

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#1

#2

No it happens opposite as heat transfers from high to low

#3

#4

No it can't be happened in vaccum

#5

#6

Faster the movement faster the heat transfer

#7

Light particles get transferred from low to high (sun light)

#8

#9

Answer:    Answer: The object moves forward at 5 m/s, stops, and then changes velocity.

Explanation:

With the information given in the question we can graph the points (image attached).

As we can observe, in the first segment of the graph the velocity is increasing linearly (at a constant rate) and is 5 m/s, then in the second segment we can see the position of the object remains the same from second 2 to second 4, which means the object is stopped.

Finally, in the third and last segment, we can observe a change in velocity (at a negative constant rate, because is decreasing), which is decreasing until the object stops.

Explanation:

Series connection

Now

\(\\ \rm\Rrightarrow P=\dfrac{V^2}{R}\)

\(\\ \rm\Rrightarrow P=\dfrac{15^2}{15}\)

\(\\ \rm\Rrightarrow P=15W\)

The amount of work W is performed by the engine if the mass of ice melted is 5.00 × 10⁻² kg and the time of operation is 5 minutes is 44.12 J.

To calculate the heat absorbed from the hot reservoir by the heat engine using the formula:

q₁ = m × L

Where L is the latent heat of the fusion of ice, which is 3.33 × 10⁵ J/kg.

Therefore:

q₁ = m × Lq₁ = (5.00 × 10⁻²) × (3.33 × 10⁵)

q₁ = 166.5 J

Now, let's calculate the work done by the heat engine using the formula:

η = W/q₁

Where η is the efficiency of the engine, which is given as the Carnot cycle. Hence,

η = (T₁ - T₂)/T1

Where T₁ is the temperature of the hot reservoir (boiling water), and T₂ is the temperature of the cold reservoir (ice and water mixture).

Hence,

η = (373 - 273)/(373)

η = 0.265 or 26.5%

This is the efficiency of the engine, and thus:

η = W/q₁

W = η × q₁

W = (0.265) × (166.5)

W = 44.12 J

Therefore, the work performed by the engine is 44.12 J.

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Infrared waves are ineffective for treating cancer because they do not transfer enough energy to destroy cancer cells.

One of the uses of a high frequency wave is in the treatment of cancer. These high frequency waves transfer enough energy to destroy the cancer cells.

E = hf

where;

Infrareds have low frequency, and hence low energy.

Thus, infrared waves are ineffective for treating cancer because they do not transfer enough energy to destroy cancer cells.

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J. J. Thompson created an apparatus composed of a sealed glass tube with electrodes of different polarities fixed at each end. By passing a high voltage through the gas in the sealed tube, he was able to create a cathode ray. J.J. Thompson called the particles that makeup cathode rays as negatively charged particles.

In the experiment, the flow of particles was from the negative terminal (cathode) to the positive terminal (anode). He also placed two plates of opposite charges around the cathode rays. The cathode rays were deflected towards the positive place.

J.J Thompson concluded that the cathode rays were composed of negatively charged particles.

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Answer:

-1+√251/5 s

Explanation:

The most appropriate equation of motion for this question is; s= ut+(at^2)/2

t=-1+√251/5 s

Answer:

Electrical>thermal>light

Explanation:

C) negative . the static frictional force as the accelerating truck moves a distance .

Accelerating is an increase in the speed or rate of something over time. This can refer to a variety of contexts, from the physical realm of physics to the economic realm of business. In physics, acceleration is the rate of change of velocity, or the rate at which an object's speed or direction changes over time.

It is usually measured in meters per second squared (m/s2). In business, acceleration can refer to growth, such as an increase in sales or profits, or an increase in the speed at which a process or procedure is completed. In either case, acceleration means that an increase in speed or rate has been achieved.

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The nuclear reaction becomes:

U₉₂²³⁸ → Th₉₀²³⁴+ α⁴₂

Thus, here (i) 234 and (ii) 90

Uranium-238 decays to thorium-234 via alpha decay. (The numbers after the chemical names indicate the number of protons and neutrons.) Uranium-238 loses two protons and two neutrons in this process, forming the isotope thorium-234.

Reactors based on thorium are safer since the reaction is simple to stop and does not need to be carried out under intense pressure. When compared to uranium reactors, thorium reactors produce significantly less waste, and the waste produced is far less radioactive and far shorter in duration.

Now, here (i) 234 and (ii) 90

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Answer:

(i) 234 and (ii) 90

\(\\ \tt\longmapsto Acceleration=\dfrac{v-u}{t}\)

\(\\ \tt\longmapsto Acceleration=\dfrac{2.7-0}{2}\)

\(\\ \tt\longmapsto Acceleration=\dfrac{2.7}{10}\)

\(\\ \tt\longmapsto Acceleration=27m/s^2\)

Answer:

⟼Acceleration=tv−u

⟼Acceleration=22.7−0

⟼Acceleration=102.7

⟼Acceleration=27m/s2

Yes, it is possible for two different observers to not agree on the time taken for a light beam to bounce off a mirror and return to its source.

This is because of the phenomenon of time dilation, which occurs due to the relative motion of the two observers. According to the theory of relativity, time appears to run slower for an observer who is moving relative to another observer who is stationary. Therefore, the two observers may perceive different times for the light beam to complete its journey, depending on their relative motion.

Additionally, factors such as the distance between the mirror and the source, the speed of light, and the precision of the measuring instruments used by each observer can also affect their measurements and lead to discrepancies in their perceived times.

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The force between a pair of cars in a train undergoing constant acceleration is much more significant compared to the forces between other cars in the same train.

The hypothesis on how the force between a pair of cars in a train undergoing constant acceleration compares to the forces between other cars in the same train is detailed below.

As the cars in a train undergo constant acceleration, the force between a pair of cars is more significant than the forces between other cars in the same train. This is due to the fact that as the acceleration increases, the force between a pair of cars increases because the car at the back is pushed forward while the car in front is pulling backward, and as a result, there is an increase in the force acting between the two cars.

                                    However, the forces between other cars in the same train are not as significant as the force between a pair of cars because there is no direct contact between them, and hence the force is much less. The greater the acceleration, the greater the force acting between a pair of cars in the train, while the force acting between other cars remains negligible.

Therefore, the force between a pair of cars in a train undergoing constant acceleration is much more significant compared to the forces between other cars in the same train.

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Answer:

Distance travel s = 296.8 m

Explanation:

Given:

Initial velocity u = 6.5 m/s

Constant acceleration a = 2.1 m/s²

Time T = 14 s

Find:

Distance travel s

Computation:

s = ut + (1/2)at²

s = (6.5)(14) + (1/2)(2.1)(14)²

s = 91 + 205.8

Distance travel s = 296.8 m

Answer:

A

Explanation:

Use the conservation of energy formula to calculate the velocity of the ball when it reaches the halfway point (10m down). Then, use your calculated value to obtain the kinetic energy.

Answer:

A. 49 on Plato

Explanation:

Its the right one trust me .

The magnitude of the acceleration of the elevator is 1.75 m/s^2, and it is directed downwards.

The difference between the reading on the scale when the student is stationary and when the elevator is moving is equal to the net force acting on the student. In this case, the scale reads 450N when the elevator is moving: 450N - 550N = -100N .

Using Newton's second law, we can calculate the acceleration of the elevator as follows: Net force = mass x acceleration

Acceleration = (-100N) / (550N / 9.81m/s^2) = -1.75 m/s^2

The negative sign indicates that the acceleration is directed downwards, in the opposite direction to the force of gravity.

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The time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

The cooling law is given by:

$$\frac{dQ}{dt}=-k(T-T_0)$$

where Q is the heat in the object, t is the time taken, T is the temperature of the object at time t, T0 is the temperature of the environment and k is a constant known as the cooling constant.

We need to find the time it takes for the coffee to reach a drinking temperature of 73°C given that its initial temperature is 93°C.

Therefore, we need to find the time it takes for the coffee to cool down from 93°C to 73°C when placed in a room temperature of 18°C.

Let’s assume that the heat energy that is lost by the coffee is equal to the heat energy gained by the environment. We can express this as:

dQ = - dQ where dQ is the heat energy gained by the environment.

We can substitute dQ with C(T-T0) where C is the specific heat capacity of the object.

We can rearrange the equation as follows:

$$-\frac{dQ}{dt}=k(T-T_0)$$

$$-\frac{d}{dt}C(T-T_0)=k(T-T_0)$$

$$\frac{d}{dt}T=-k(T-T_0)$$

The differential equation above can be solved using separation of variables as follows:

$$\frac{d}{dt}\ln(T-T_0)=-k$$

$$\ln(T-T_0)=-kt+c_1$$

$$T-T_0=e^{-kt+c_1}$$

$$T=T_0+Ce^{-kt}$$

where C = e^(c1).

We can now use the values given to find the specific value of C which is the temperature difference when t=0, that is, the temperature difference between the initial temperature of the coffee and the room temperature.

$$T=T_0+Ce^{-kt}$$

$$73=18+C\cdot e^{-0.09t}$$

$$55=C\cdot e^{-0.09t}$$

$$C=55e^{0.09t}$$

$$T=18+55e^{0.09t}$$

We can now solve for the value of t when T=93 as follows:

$$93=18+55e^{0.09t}$$

$$e^{0.09t}=\frac{93-18}{55}$$

$$e^{0.09t}=1.3636$$

$$t=\frac{\ln(1.3636)}{0.09}$$

Using a calculator, we can find that the time taken for the coffee to cool from 93°C to 73°C is approximately 36.1 minutes.

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In the image, the distance between A and B represents the d of the equation.

Diffraction occurs when waves, such as light or sound, spread out when they pass through a slit or around an object.

Light will spread out and overlap with light from the other slits as it travels through each of the slits.

The two-slit diffraction of light is seen in the figure below. Wave sources are represented by narrow slits at A and B, while waves interfering in various phases are displayed at C, D, E, and F.

A diagram illustrating light diffraction through two slits. On the left, narrow slits A and B operate as sources, while on the right, waves interfering in various phases are depicted at C, D, E, and F.

The given equation is;

\(\frac{\lambda}{d} =\frac{x}{L}\)

The equation represents the image form between A and B.

Hence in the image, the distance between A and B represents the d of the equation.

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When waves, like sound or light, spread out as they move through a slit or around an object, this is known as diffraction.

Thus, As light passes through each slit, it will disperse and blend with light from the other slits.

The illustration below shows how light is diffracted by two slits. Narrow slits at A and B depict the wave sources, while waves interacting in different phases are shown at C, D, E, and F.

a picture showing the diffraction of light via two slits. Narrow slits A and B act as sources on the left, and on the right, waves at C, D, E, and F are shown interacting in different phases.

Thus, When waves, like sound or light, spread out as they move through a slit or around an object, this is known as diffraction.

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Answer: 5.7

Explanation: 38% of 15.

The weight we experience ourselves and the ability to stand in the ground is due to the gravitational pull of earth. If this pull is lower we feel weight loss. So the cat will have a weight of 5.7 pounds or 2.58 kg in mars where the gravitation is about 38% of earth.

Gravitational force is a kind force by which a body attracts other objects into its centre of mass. Earth have strong gravitational effect on objects and thus we are all standing on the surface and everything falling from a height hits the ground.

As the mass of the object increases, gravitational effect also increases. The weight experienced by a body is the product of its mass and gravity. Thus massive body have greater weight.

Our mass is constant everywhere but weight will change according a change in gravity. Mars  have only 38% of gravity of earth. Thus the cat weighing 15 pounds on earth will loss its weight in mars by 38%.

Thus, 15 × 38/100= 5.7 pounds will be the weight of the cat in mars.

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The output voltage required of a defibrillating device will be 1700 V.

Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.

Given data;

I = 17 mA=17×10⁻³ A

R = 1×10⁵ ohm

Ohm's law claims that the voltage across a conductor is directly proportional to the current flowing through it.

This current-voltage connection may be expressed mathematically as,

The Equation of Ohm's Law

V=IR

V =17×10⁻³ A×  1×10⁵ ohm

V = 17 × 10²

V = 1700 V

Hence,the output voltage required of a defibrillating device will be  1700 V

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Answer:

Decreases I believe

Explanation:

I'm sorry if it isn't and I have failed you

Answer:

A. 4.67 m/s²

Explanation:

u = 145 m/s

v = 75 m/s

t = 15 s

a = v - u / t

= 145 - 75 / 15

= 4.67 m/s²

Hope this helped...

A string of fifty 15 ohm Christmas tree lights are connected parallelly. When one of them burns , the rest stay lit. The total resistance is :

Total resistance = 3.266 ohm

A break in any one of the path does not interrupt the flow of current in the remaining paths. Sum of the reciprocals of individual resistance is equal to the the reciprocal of the total resistance .

If the two resistances connected in parallel are equal and of the same value, then the total resistance, RT is equal to half the value of one resistor.

A string of fifty 15 ohm Christmas tree lights are connected parallelly. One of them burns, the rest stay lit,

Total resistance in parallel = 1/R1 +1/R2+....

= 1/15 +1/15+...…. 1/15  (49 times as one burns )

= 1/15* 49

= 3.266 ohm.

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Yes, there will be regions around the two positive charges where the electric potential is zero. These regions are known as equipotential lines or equipotential surfaces. An equipotential line is a line that connects points with the same electric potential.

The equipotential lines around the positive charges are perpendicular to the electric field lines. Since the electric potential is defined as the amount of electric potential energy per unit charge at a given point, the electric potential becomes zero at points where the electric potential energy is also zero. In this scenario, the equipotential lines intersect the line connecting the two positive charges at right angles, creating a symmetrical pattern. The equipotential lines are closer together near the charges, indicating a higher electric potential gradient, and farther apart as we move away from the charges. At points equidistant from both positive charges, the electric potentials of the charges cancel each other out, resulting in a net electric potential of zero. Therefore, these regions of zero electric potential would be located on the perpendicular bisector of the line connecting the two positive charges.

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If the table says that the atomic number of the element is 12 and the mass number of the element is 40, then the element has 12 protons and 28 neutrons, therefore the correct answer is option C.

It is the sum of the mass of all the protons as well as the neutrons that are present inside the nucleus.

The addition of protons and neutrons represents the mass number of any element.

The mass number of any element is the sum of the number of protons and the number of neutrons, therefore the correct answer is option C.

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