why is black the good absorber of radiation?​

Answers

Answer 1

Answer:

=> Black colour do not reflect the wavelength of light and is a good emitter of heat . This, black is a good absorber of radiation.

Answer 2

Answer:

Black coloured objects absorb all the wavelengths of light and do not reflect any of them. Therefore, it looks black in colour and is considered to be a good absorber and a good emitter of heat. On the other hand, white coloured objects reflect all the light that falls into it and therefore they look white


Related Questions

Titanium's specific heat capacity is 0. 523 j/g*k. how many joules of heat are required to raise the temperature of 2. 50g of titanium from 65. 0°c to 600. 0°c?

Answers

The amount of heat required to raise the temperature is 706.05J.

To find the answer, we need to know more about the specific heat capacity.

How to find the heat required to raise the temperature?Specific heat can be defined as, the amount of heat needed to increase a substance's temperature by one degree for every gram.We have the expression for amount of heat required to raise the temperature from T1 to T2 as,

                                 Q=msΔT

We have given with the following values,

                 [tex]m=2.50g=2.50*10^{-3}kg\\s=0.523 J/gK=\frac{0.523}{10^{-3}} J/kgK=523J/kgK\\T_1=65^0C=338K\\T_2=600^0C=873K\\[/tex]

Thus, the amount of heat required to raise the temperature is,

            [tex]Q=2.5*10^{-3}*523*(873-333)=706.05 J[/tex]

Thus, we can conclude that, the amount of heat required to raise the temperature is 706.05J.

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Select all the correct answers. which three forms of light are invisible light? blue light infrared rays radio waves red light x-rays

Answers

Infrared rays, radio waves, and x-rays are the three kinds of light that are invisible to human vision.

What is a visible spectrum?

The region of the electromagnetic spectrum that the human eye can see is known as the visible light spectrum. This group of wavelengths is most commonly referred to as visible light. The range of wavelengths that the human eye can typically see is from 380 to 700 nanometers.

Example of visible spectrum is visible light.

Examples of invisible light are;

Infrared raysRadio wavesx - rays

Thus, the three forms of light that are invisible light or invisible to human eyes are Infrared rays, Radio waves and x - rays.

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Why is there an error between the calculated values of r and the nominal value of r?.

Answers

The nominal value is based on experimental results whereas this model is likely based on the ideal gas law, which real gasses don't follow precisely.

What is nominal value?In economics, nominal values guide the unadjusted rate or current price, without taking inflation or other elements into account as opposed to real discounts, where adjustments are made for available price level changes over the period.The nominal price of a guarantee is its stated value, its saving price, or its unadjusted price, without taking into account inflation and other elements. The real value of a guarantee is its market value or a modified price that accounts for price level transitions that have occurred over a period.In economics, the nominal significance is the unadjusted value of an asset without carrying into account deductions and compensations, such as expenses, taxes, and inflation. It is the difference between the real value of an asset, which contemplates deductions and premiums.

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If a spaceship approaches you at 0. 5c, and a light on the spaceship is turned on pointing in your direction, how fast will the light be traveling when it reaches you?

Answers

The light will be travelling at its own speed 300,000 km/s which is the speed of the light.

Speed of light:

One universal physical constant that is significant in many branches of physics is the speed of light in a vacuum, typically abbreviated as c. Its precise value is 299792458 meters per second or roughly 300000 kilometers per hour or 186000 miles per hour. The maximum speed at which common matter, energy, or any signal carrying information may move through space is c, according to the special theory of relativity.

Similar to how electromagnetic waves in wire cables move more slowly than c, light moves more slowly through transparent materials like glass or air. The refractive index n of a substance (n = c/v) is the ratio between c and the speed v at which light moves through it.

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Given that ethylene has a λmax of 175nm, butadiene has a λmax of 220nm, and 2-methyl-1,3-butadiene has a λmax or 215nm, what is the λmax of 2,3,4-trimethylhexatriene?

Answers

The λmax of 2,3,4-trimethylhexatriene is 280 nm.

Ethylene has a λmax of 175nm.

Butadiene has a λmax of 220nm.

2-methyl-1,3-butadiene has a λmax or 215nm.

1,3,5-hexatriene has a λmax of 258nm.

Woodward's rules, sometimes known as Woodward-Fieser rules (after Louis Fieser) and named after Robert Burns Woodward, are a number of sets of empirically developed principles that aim to forecast the wavelength of the absorption maximum (max) in an ultraviolet-visible spectrum of a certain molecule.

By using the Woodward Fieser rule,

R- (Alkyl Group) .... +5 nm = 5 × 2 = 10

RO- (Alkoxy Group) .. +6 = 6 × 2 = 12

Adding 22nm to the λmax of 1,3,5-hexatriene as it has 2 alkyl groups and 2 alkoxy groups to form 2,3,4-trimethylhexatriene.

The λmax of 2,3,4-trimethylhexatriene is 280 nm.

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Compute the torque developed by an industrial motor whose output is 175 kw at an angular speed of 4300 rev/min.

Answers

The torque developed by an industrial motor whose output is 175 kw at an angular speed of 4300 rev/min will be 389 Nm.

Given

Power = 175kw = 17500 WAngular Speed(ω) = 4300 rev/min = 450 rad/s

Let Torque = т

P = т * ω

т = P/ ω

т = 17500 / 450 = 388.88 Nm (approx. 389 Nm)

Hence , the torque developed by an industrial motor whose output is 175 kw at an angular speed of 4300 rev/min will be 389 Nm.

In physics and mechanics, torque is the rotational equivalent of linear force. It is also referred to as the moment, moment of force, rotational force or turning effect, depending on the field of study. It represents the capability of a force to produce change in the rotational motion of the body.

We can define power as the rate of doing work, it is the work done in unit time. The SI unit of power is Watt (W) which is joules per second (J/s). Sometimes the power of motor vehicles and other machines is given in terms of Horsepower (hp), which is approximately equal to 745.7 watts.

Angular speed is the speed of the object in rotational motion.

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B. the hockey player is moving at a speed of 9. 5 m/s. if it takes him 2 seconds to come to a stop under constant acceleration, how far does he travel while stopping? (2 points)

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The hockey player is moving at a speed of 9. 5 m/s. if it takes him 2 seconds to come to a stop under constant acceleration, will be s = 9.5 m.

The branch of physics that defines motion with respect to space and time, ignoring the cause of that motion, is known as kinematics. Kinematics equations are a set of equations that can derive an unknown aspect of a body’s motion if the other aspects are provided.

These equations link five kinematic variables:

Displacement (denoted by Δx)

Initial Velocity v0

Final Velocity denoted by v

Time interval (denoted by t)

Constant acceleration (denoted by a)

These equations define motion at either constant velocity or at constant acceleration. Because kinematics equations are only applicable at a constant acceleration or a constant speed, we cannot use them if either of the two is changing.

v = u + at

0 = 9.5 + a (2)

a = - 9.5 /2  m/[tex]s^{2}[/tex]

[tex]v^{2}[/tex] = [tex]u^{2}[/tex] + 2as

0 =  [tex](9.5)^{2}[/tex] + 2* (- 9.5 /2) * s

-  [tex](9.5)^{2}[/tex]  = - 9.5 s

s = 9.5 m

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As a supplement to some diets, iron is consumed in tablet form. The mass of iron in these tablets is often measured in?

Answers


Mg or can be measured in land then split in a machine called Spock
Answer is milligrams or mg

The amount of a medicine in a tablet is usually measured in milligrams.

An infinitely long cylinder of radius r = 2 cm carries a uniform charge density rho = 18 μc/m3. calculate the electric field at distance r = 1 cm from the axis of the cylinder?

Answers

The electric field at distance r = 1 cm from the axis of the cylinder is   [tex]1.02*10^{4} N/C[/tex]

Electric Field= 2kρπr

Given,

Charge density(ρ)= 18 μc/m3.

radius = 1 cm = 0.01m

k=9*[tex]10^{9}[/tex]

Electric Field= 2kρπr=2*9*[tex]10^{9}[/tex]*18*[tex]10^{-6}[/tex] * π* 0.01= [tex]1.02*10^{4} N/C[/tex]

Electric Field

Physically, electrically charged particles are surrounded by an electric field, which acts to either attract or repel all other charged particles in the vicinity. A system of charged particles' physical field is also referred to in this phrase. Charges and time-varying currents in electric systems give rise to electric fields. The electromagnetic field—one of the four basic interactions of nature—exudes both electric and magnetic fields. Many branches of physics place a premium on electric fields, which are also used to great effect in modern electrical engineering. The attractive force holding the atomic nucleus and electrons together in an atom, for example, is the electric field in atomic physics and chemistry. The chemical bonds that form between atoms to form molecules are also caused by this force.

An infinitely long cylinder of radius r = 2 cm carries a uniform charge density rho = 18 μc/m3. calculate the electric field at distance r = 1 cm from the axis of the cylinder?

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The human body has an average density of 979 kg/m^3. What fraction of a person is submerged when floating gently in fresh water?

Answers

A person is submerged of about 97.9%

The average density of the human body is given as

[tex]979kg/m {}^{3} [/tex]

What is Law of Floating?

Law of floating can be defined as the volume of the liquid

displaced when a body floats on the liquid surface is equal to the body submerged in water.

As body has the stable equilibrium state,the buoyant of the fluid will be equal to the weight.

weight of the body floating=weight of the body immersed in fluid

Law of floating=Density of the floating object/density of fluid

As fluid is the freshwater here,the density of fluid will be

[tex]1000kg/m {}^{3} [/tex]

[tex] = (979kg/m {}^{3})/(1000kgm {}^{3} )[/tex]

=97.9%

A person is submerged when floating gently in fresh water about 97.9%

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What effect does the diameter of the string have on the lever arm? explain why we can ignore this effect

Answers

The effective lever arm will be enhanced if we utilize a big diameter string.

What is Lever Arm?

The perpendicular distance from the axis of rotation to the force's line of action is specified as the lever arm.

When a big diameter string is utilized, the effect of the diameter on the string of the lever arm will be enhanced.

This is due to the reason that if the radius of the pulley is R and the radius of the string is r, then the effective lever arm becomes R+r.

If the radius,r of the string is very minute such that its addition to the radius of the pulley, R will hardly make a change to the effective lever arm, then it is avoided. However, if the radius of the string is a big number then it can not be avoided as it can make significant errors in the calculation of the effective lever arm.

Hence, The effective lever arm will be enhanced if we utilize a big diameter string.

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Please help me!! 1 a) Compare the speed that light waves travel in air to the speed that sound waves travel in the air. (Show results in meters/second) 1 b) How many times faster do light waves travel in the air in comparison to sound waves in air? (show working out) 2) Compare the speed of light in water to the speed of sound in water. (Show results in meters/second)

Answers

The speed of light waves travel in air is 3.0 * 10⁸ m/s, while the speed of sound waves in air at 25° C is 346.3 m/s.

Light waves travels 8.66 * 10⁵ times faster in air in comparison to sound waves in air.

The speed of light in water is 3.0 * 10⁸ m/s while the speed of sound in water is 1.481 m/s

What is wave speed?

The distance covered by a wave per second is known as the wave speed.

The speed of a wave varies according to the density of the medium it is travelling as well as the due to the frequency of the wave.

The speed that light waves travel in air = 3.0 * 10⁸ m/s

The speed that sound waves travel in the air at 25° C = 346.3 m/s

The ratio of the speed of speed that light waves travel in air to that of the speed that sound waves travel in the air at 20° C = 3.0 * 10⁸/346.3 = 8.66 * 10⁵

Therefore, light waves travels 8.66 * 10⁵ in the air in comparison to sound waves in air

The speed of light in water = 3.0 * 10⁸ m/s

The speed of sound in water = 1,481 m/s

Therefore, light waves travels much faster water than sound waves in water.

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What is the energy of a photon given that the radiation has a wavelength of 440 nm?

Answers

The energy of a photon given that the radiation has a wavelength of 440 nm will be  .045 * [tex]10^{-17}[/tex] J

A photon is the quantum of electromagnetic radiation that describes the particle properties of an electromagnetic wave. The energy of a photon is given by the equation E = hf, where E is energy, h is Planck's constant, and f is frequency.

Forms of electromagnetic radiation like radio waves, light waves or infrared (heat) waves make characteristic patterns as they travel through space. Each wave has a certain shape and length. The distance between peaks (high points) is called wavelength

Energy = h*c / lambda

h= plank's constant =  6.626 * [tex]10^{-34}[/tex] J

c = speed of light = 3 * [tex]10^{8}[/tex] m/s

lambda = wavelength = 440 nm = 440 * [tex]10^{-9}[/tex] m

energy of a photon = 6.626 * [tex]10^{-34}[/tex] * 3 * [tex]10^{8}[/tex] / 440 * [tex]10^{-9}[/tex]

                                 = 19.878 * [tex]10^{-26}[/tex] /  440 * [tex]10^{-9}[/tex]

                                 = .045 * [tex]10^{-17}[/tex] J

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What expression gives the wavelength of the third harmonic for a 1.5 m pipe that is closed at one end?

Answers

The expression that gives the wavelength of the third harmonic for a 1.5 m pipe that is closed at one end is,

λ = (4/3)*L

where, λ represents the wavelength and L represents Length of the pipe.

What is a wave?The distance between sound wave points or waves crests that follow one another is known as wave.What are a crest?The crest of a wave refers to its highest surface area.What is a trough?

The trough refers to a wave's lowest surface area.

Basic properties of waves include:

wavelength - the distance between successive crests is said to be known as wavelength.

frequency - number of vibrations per second is considered to be frequency.

time period -  the time taken by a complete cycle of the wave to pass a point is defined as time period.

speed  - the rate at which an object covers distance can be defined as speed.

amplitude - the maximum displacement or distance moved by a point on a vibrating body or wave measured from its equilibrium position is known as amplitude.

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The astronomer who first worked out the mathematical description of black hole event horizons was?

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Karl Schwarzschild devised the first general relativity model that would adequately describe a black hole in 1916.

What is Black Hole?

A black hole is an area of spacetime with such intense gravitational pull that nothing can escape from it, not even light or other electromagnetic waves. According to general relativity theory, a compact enough mass can bend spacetime into a black hole. The event horizon is the line beyond which there is no escape.

Black holes were once thought to be a mathematical curiosity, but theoretical research in the 1960s revealed that they were actually a general prediction of general relativity.

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Mercury at 25°c flows over a 3-m-long and 2-m-wide flat plate maintained at 75°c with a velocity of 0. 01 m/s. Determine the rate of heat transfer from the entire plate?

Answers

The rate of heat transfer from the entire plate is 710.8 kW

The properties of mercury at the film temperature of (75+25)/2= 50°C

k = 8.83632 W/m °C

v = 1.056 × [tex]10^-^7[/tex] m²/s

Pr = 0.0223

The local Nusselt number relation for liquid metals is given by

 [tex]N_u =\frac{h_sx}{k} = 0.565 9Re_x Pr)^\frac{1}{2}[/tex]

The average heat transfer coefficient for the entire surface can be determined from

[tex]h = \frac{1}{L} \int\limits^1_0 {h_x} \, dx[/tex]

Substituting the local Nusselt number relation into the above equation and performing the integration we obtain

[tex]N_u = 1.13 (Re_s Pr)^\frac{1}{2}[/tex]

The Reynolds number is

[tex]Re_L = \frac{VL}{v} = \frac{(0.01)(3m)}{1.056 * 10^-^7 m^2/s} = 0.028 * 10^7[/tex]

Using the relation for the Nusselt number, the average heat transfer coefficient and the heat transfer rate are determined to be

                       Q = 710.8 kW

Therefore, the rate of heat transfer from the entire plate is 710.8 kW

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A space shuttle is flying north at 6,510 m/s. It
then begins accelerating at 28.4 m/s² directly
northeast to properly align its path towards
orbit around the Earth. After 60.0 s, what is
the magnitude of its velocity?
Vf = [?] m/s
a
Vf

Answers

Answer:

7808 m/s

Explanation:

Find NE velocity after 60 s  of acceleration in that direction:

  = a t  =  28.4 m/s^2 * 60 s = 1704  m/s

    Vertical component = 1704 sin 45 = 1204.9 m/s

     Horiz component = 1704 cos 45 = 1204.9  m/s

Add the two vertical components

  6510 + 1204.9 = 7714.9 m/s = vertical velocity

Pythagorean theorem to find resultant of vertical and horiz  v's

Vf ^2 = 1204.9^2   + 7714.9^2 0

Vf = 7808. m/s

Answer: 81.1 for the direction of its velocity and 7808 for the magnitude of its velocity

Explanation:

determine the voltage of the diagram in the image




Answers

Answer:

total voltage is 9 V is the correct answer of given question

A vector has a component of 10 m in the x-direction, a component of 10 m in the y-direction, and a component of 5 m in the z direction. The magnitude of this vector is?

Answers

The magnitude of this vector is 15

A vector is a quantity or phenomenon that has two independent properties: magnitude and direction. The term also denotes the mathematical or geometrical representation of such a quantity. Examples of vectors in nature are velocity, momentum, force, electromagnetic fields, and weight.

The magnitude of a vector formula is used to calculate the length for a given vector (say v) and is denoted as |v|. So basically, this quantity is the length between the initial point and endpoint of the vector.

Let vector be = a

component of vector in x direction = 10 i

component of vector in y direction = 10 j

component of vector in z direction = 5 z

vector a = 10 i + 10 j + 5 z

magnitude of vector a = |a| = [tex]\sqrt{10^{2} +10^{2} + 5^{2} }[/tex]

                                             = 15

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WORD BANK:
base, derived, scalar, vector

1.) Displacement is ___ and ___
2.) Acceleration due to gravity is ___ and ___
3.) Position is ___ and ___
4.) Speed is ___ and ___
5.) Time is ___ and ___

Answers

Answer:

1. Vector, base

2. Vector, derived

3. Vector, ?

4. Scalar, derived

5. scalar, base

What did the author mean when he said that summer storms can ""snap"" a heat wave? why was the word snap used?

Answers

The word snap was utilized on the grounds that mid year tempests can end heat waves rapidly by acquiring colder temperatures.

why was the word snap used?

Sweltering summer heat waves are on the ascent across the Northern Hemisphere. The ascent is being driven by changes in the air prodded by a warming Arctic, new exploration shows.

Researchers call this cycle the nursery impact. The gases that retain the approaching sun based radiation are called ozone harming substances. Consequently, the nursery impact helps in keeping up with the temperature of Earth during summers and winters.

Researchers arrived at that resolution in the wake of analyzing 35 years of climate information. They detected a decrease in the strength of summer storms. These tempests get welcome alleviation to northern landmasses the type of cool, clammy air.

Wind design changes welcomed on by the quickly warming Arctic debilitated summer storms. The scientists depicted their discoveries online March 13 in Science.

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Answer:

The word snap was used because summer storms can end heat waves very quickly by bringing in colder temperatures.

Explanation:

Edmentum answer

The helium-neon lasers most commonly used in student physics laboratories have average power outputs of 0. 250 mw. True or false?.

Answers

True

The helium-neon lasers most commonly used in student physics laboratories have average power outputs of 0. 250 mw

Intensity of laser beam is 72.3W/m²

Given:

average power output = 0. 250 mw

To Find: intensity of laser beam

Solution:

First of all, we need to find the area of the circular spot, which is given by:

A = πr^2

where r is the radius of the spot, which is half the diameter, therefore

r = d/2 = 2.10mm/2 = 1.05mm = 1.05 x 10^-3m

So, the area of the spot is

A = π(1.05 10^-3m)^2 = 3.46 10^-6m²

We know that the power output of the laser is

P = 0.250mW = 2.5.10^-4W

So the intensity of the laser beam is

I = P/A = 2.5^-10 W/3.46-10^-6m^2 = 72.3W/m²

So, intensity of laser beam is 72.3W/m²

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You are approaching a police car at 68. 1 mph and the police car is approaching you at 94. 8 mph. Assume that the speed of sound is 700 mph. A. If the police car has a 1224 hz siren, what frequency do you hear? 1s.

Answers

We will hear the sound of siren of frequency 1553.4606 Hz.

What is Doppler Effect?

The apparent change in wave frequency brought on by the movement of a wave source is known as the Doppler effect. When the wave source is coming closer and when it is moving away, the perceived frequency changes. The Doppler effect explains why we hear a passing siren's sound changing in pitch.

according to Dopplers Effect,

[tex]f'=[\frac{v + v_{0} }{v - v_{s} } ]f[/tex]

[tex]f'= [\frac{700+68.1}{700-94.8} ]* 1224[/tex]

[tex]f'= 1553.4606 Hz[/tex]

the frequency would be 1553.4606 Hz.

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Ten seconds after starting from rest, a car is moving at 60 m/s. what is the carâs acceleration?

Answers

Ten seconds after starting from rest, a car is moving at 60 m/s. what is the cars acceleration? 6 m/s^2

What is acceleration?

Average acceleration= (final velocity-initial velocity)/time

The rate at which an object's velocity with respect to time changes is referred to as acceleration in mechanics. It is a vector quantity to accelerate (in that they have magnitude and direction). The direction of the net force acting on an object determines the direction of its acceleration. According to Newton's Second Law, an object's acceleration is the result of two factors working together: the object's mass, which varies depending on the materials it is made of, and the net balance of all external forces acting on it. The magnitude of an object's acceleration is inversely proportional to the object's mass.

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Determine the shortest frequency of light required to remove an electron from a sample of ti metal if the binding energy of titanium is 3. 14 × 10^3 kj/mol

Answers

The shortest frequency of light required to remove an electron from a sample of ti metal if the binding energy of titanium is 3. 14 × [tex]10^{3}[/tex] kj/mol will be  v = 0.47 * [tex]10^{37}[/tex] Hz

Binding energy, amount of energy required to separate a particle from a system of particles or to disperse all the particles of the system. Binding energy is especially applicable to subatomic particles in atomic nuclei, to electrons bound to nuclei in atoms, and to atoms and ions bound together in crystals.

Work function is defined as the minimum amount of energy needed to remove an electron from the atom. So, the minimum energy required to remove an electron is called the Work function.

plank's constant = 6.62 × [tex]10^{-34}[/tex] [tex]m^{2}[/tex] kg/s

Binding energy   = 3. 14 × [tex]10^{3}[/tex] kj/mol

Energy = plank's constant * frequency

3. 14 × [tex]10^{3}[/tex] = 6.62 × [tex]10^{-34}[/tex] *  v

       v  =  3. 14 × [tex]10^{3}[/tex]  /  6.62 × [tex]10^{-34}[/tex]

       v = 0.47 * [tex]10^{37}[/tex] Hz

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The sahara and australian deserts (among others) are associated with which pressure belt?

Answers

The Sahara and Australian deserts (among others) are associated with a sub-trpical high-pressure belt.

This location is for that reason a place of high stress. it's also called the pony range. Winds usually blow from excessive strain to low strain. So the winds from the subtropical region blow towards the Equator as change winds and some other winds blow toward Sub-Polar Low-pressure as Westerlies.

For the duration of the Northern Hemisphere's summer, the oceans are generally cooler in comparison to the warmer continents. In flip, cooler, denser maritime air that overlies the oceans serves to enhance surface pressures, paving the way for quite robust subtropical highs throughout summer.

The subtropical high-pressure belt vicinity is also referred to as the pony range. Those latitudes are characterized via calm winds and little precipitation.

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An object weighs 7. 84 n when it is in air and 6. 86 n when it is completely immersed in water. what is the density of the object?

Answers

Answer:

The density of the object is 8000 kg/m^3

Explanation:

Weight in air = 7.84 n

Weight in water = 6.86 N

density of water = 1000 kg/m^3

Let d be the density of the object

According to the Archimedes principle, when a body is immersed in a liquid partly or wholly, it experiences an upward force which is called buoyant force. The buoyant force is equal to the loss in weight of the body.

Loss in weight of the object = Weight of object in the air - the weight of an object in the water

Loss in weight = 7.84 - 6.86 = 0.98 N

The volume of body x density of water x g = 0.98

Let V be the volume of the body

V x 1000 x 9.8 = 0.98

V = 10^-4 m^3

Weight in air = Volume of body x density of body x g

7.84 = 10^-4 x d x 9.8

d = 8000 kg/m^3

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The density of the object is ([tex]\rho_{ob}[/tex])= 80,000 [tex]kg/m^3[/tex]

How can we calculate the value of the density of the object?

To calculate the density, we have to calculate the buoyancy force that the water exerts on the object. To calculate the buoyancy force we use the formula,

[tex]B= W_{air}- W_{water}[/tex]

Here we are given,

[tex]W_{air}[/tex] = The weight of the object in air = 7.84 N

[tex]W_{water}[/tex]= The weight of the object in water= 6.86 N

We have to calculate the buoyancy force =B

Now we put the known values in the above equation, we get

[tex]B= 7.84-6.86[/tex] = 0.98 N.

We know that the buoyant force depends on the volume of water displaced by the Volume of the object, so the formula stands,

[tex]B= \rho_{water} \times V_{ob}\times g[/tex]

Or, [tex]V_{ob}=\frac{B}{g\times \rho_{water}}[/tex]

Here we are given,

B= The buoyancy force = 0.98N.

[tex]\rho_{water}[/tex]= The density of water = 1000 [tex]Kg/m^3[/tex]

g= gravitational acceleration= 9.81[tex]m/s^2[/tex]

We have to calculate the volume of the object= [tex]V_{ob}[/tex]

Now we put the known values in the above equation, we get

[tex]V_{ob}=\frac{B}{g\times \rho_{water}}[/tex]=[tex]\frac{0.98}{9.81\times 1000}[/tex]=[tex]1.0\times 10^{-5} m^3[/tex].

So, now the volume of the object ([tex]V_{ob}[/tex])= [tex]1.0\times 10^{-5} m^3[/tex]

The weight of the object in the air can be calculated using the following formula, [tex]W_{ob}= m_{ob} \times g[/tex]

[tex]m_{ob}[/tex]=the mass of the object.

From this equation we can calculate the mass of the object,

[tex]m_{ob}=\frac{W_{ob}}{g}[/tex]= [tex]\frac{7.84}{9.81}[/tex]=0.80Kg.

(We know that the weight of the object in the air is the original weight of the object, so [tex]W_{ob} = W_{air}[/tex]=7.84N )

So, the mass of the object is ([tex]m_{ob}[/tex])= 0.80 Kg.

Now, let us consider the density of the object is [tex]\rho_{ob}[/tex]

From the definition of the density we can simply know that,

[tex]\rho_{ob}=\frac{m_{ob}}{ V_{ob}}[/tex]

Or,[tex]\rho_{ob}=\frac{0.80 }{1.0\times 10^{-5} }[/tex]

Or.[tex]\rho_{ob}=8\times 10^{4} Kg/m^3[/tex]

Or, [tex]\rho_{ob}=80,000 Kg/m^3[/tex]

From the above calculation we can define that the  density of the object is 80,000 [tex]kg/m^3[/tex]

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An object having a fixed emissivity of 0. 725 radiates heat at a rate of 10 w when it is at an absolute temperature t. If its temperature is doubled to 2t. At what rate will it now radiate?.

Answers

160 W rate it will radiate.

What, using an example, is absolute temperature?

The Kelvin scale, where 0 represents absolute zero, is used to measure absolute temperature. The temperature at which matter's particles move the least and cannot cool down is known as the zero point (minimum energy)

What is the temperature's absolute value?

The lowest energy state for a thermodynamic system is absolute zero. In terms of temperature, it is equivalent to 459.67 °F in Fahrenheit and 273.15 °C in Celsius.

Why is absolute temperature used?

The temperature of an object on a scale where 0 is assumed to be absolute zero is known as its absolute temperature, also known as thermodynamic temperature. The Kelvin and Rankine scales measure absolute temperature.

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Whats the usefulness or inconvenience of frictional force in a soccer player running with soccer boots (studs underneath)

Answers

Answer:

They're are useful in providing larger frictional force

Explanation:

The football shoes have spikes or studs because the studs or spikes provides larger frictional force than normal shoes while running on the grass.

The studs helps to prevent a player from slipping on the grass and help to run faster and change direction quickly without slipping.

When the red light is on, the pigeon does not peck on the disk because it has learned that food will only be presented when the green light is on. this demonstrates the concept of:________

Answers

When the red light is on the pigeon does not peck on the disk and picks on green light, this demonstration is Stimulus reinforcement.

Fantastic reinforcement refers to the introduction of a perfect or quality stimulus after a conduct. The acceptable stimulus reinforces the conduct, making it more likely that the conduct will reoccur.

Reinforcement can consist of anything that strengthens or increases a behavior. three In a lecture room setting, for example, varieties of reinforcement would possibly include giving praise, letting college students out of undesirable work, or presenting token rewards, sweet, greater playtime, or a laugh sports.

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A pigeon has learned that pecking a key when a red light is on is sometimes reinforced with access to food. The first time a green light is turned on, the pigeon begins to peck at the key. This illustrates the process of__

a. Stimulus discrimination

b.  Stimulus discrimination

c. Stimulus reinforcement

d. Observational learning

Hence the answer is option c Stimulus reinforcement.

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When the red light is on the pigeon does not peck on the disk and picks on green light, this demonstrates the concept of Stimulus reinforcement.

Stimulus reinforcement is a stimulation that strengthens or weakens the behavior that has produced it.

Reinforcement is an action to encourage something. Stimulus is something that produces a sensory or behavioral response in a species.

A Positive stimulus reinforcement is referring to the introduction of desirable stimulus. It makes the stimulus reinforcement more likely that the behavior will be reoccurring. For example, In a classroom, praises act like a reinforcement. When the red light is on the pigeon does not peck on the disk and picks on green light, demonstrating Stimulus Reinforcement.

Fantastic reinforcement refers to the introduction of a perfect and a quality stimulus after a conduction.

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