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What is the physical meaning of emissivity write its unit
Answers
Answer: a measure of the ability of a surface to radiate energy; the ratio of the radiant flux emitted per unit area to that emitted by a black body at the same temperature.
Explanation: hope that helped! (:
Related Questions
I NEED HELP FAST!!! (20 POINTS)
Think about what forces are involved in the different parts of this investigation.
Explain why there is a difference in the amount of Newtons measured when you weighed the objects versus when you pulled the objects across a surface
Your answer should mention how the force=mass*acceleration formula is involved.
Answers
Answer:
im not 100% sure but i think d it makes the most sense to me
Explanation:
Answer:
I think its D, it makes the most sense to me
Which of the following statements are true (mark all that apply) primordial nucleosynthesis produced all of the elements heavier than helium chemical composition of our solar system matches the chemical composition of the Milky Way some of the stars in the Milky Way may be older than the Milky Way your body contains a lot of helium nearly all atoms of elements heavier then helium were produced through nuclear fusion in stellar interiors and through reactions that occur during explosions that massive stars undergo at the ends of their lives or during mergers of stellar remnants called neutron stars some of the oldest galaxies are about 13.2 billion years old nucleosynthesis is a process through which the atoms of various elements are produced you're mainly made of hydrogen
Answers
Answer:
The correct options are;
1) The chemical composition of our solar system matches the chemical composition of the Milky Way
2) Nearly all atoms of elements heavier than helium were produced through nuclear fusion in stellar interiors and through reactions that occur during explosions that massive stars undergo at the ends of their lives or during mergers of stellar remnants called neutron stars
3) Some of the oldest galaxies are about 13.2 billion years old
4) Nucleosynthesis is a process through which the atoms of various elements are produced
5) You re mainly made of hydrogen
Explanation:
1) There are dependencies between chemical composition of stars and planets and the same distribution of chemicals we have in our Solar system have been observed to be present in varying resemblance through out the Milky Way
2) The formation of heavier elements are believed to have been formed by astrophysical fusion processes
3) The oldest known object (and hence the galaxy where the star resides), is from a distant star known as GRB 090423 which is about 13 billion years old
4) New atomic nuclear are created by the process of protons and neutrons by the process of nucleosynthesis
5) 62%of the atoms in the body are hydrogen atoms.
which best explains why offspring created through sexual reproduction have greater variation than those created through asexual reproduction
Answers
Answer:
its fun
Explanation:
I like fun OWo
A meteor that originally was heading east breaks up into two chunks. One of the chunks moves southeast. The second chunk was not immediately found, but scientists guessed that they should look for an object heading
northeast
west
southeast
north
Answers
Answer:
northeast
Good luck on your assignment!
You launch a model rocket that has a mass of 2 kg. At a height of 400 m, it is traveling at 150 m/s. What is its kinetic energy at this point? A. 22,500 J O B. 113 J O C. 150 J O D. 45,000 J
Answers
Explanation:
KE = ½ mv²
KE = ½ (2 kg) (150 m/s)²
KE = 22,500 J
Answer:
A. 22,500
Explanation:
Pulling a block up a ramp
Answers
Answer:
Motion on an incline plane
Explanation:
A number of forces are acting on the box, including both gravity and friction, and you need to take both into account. There’s also the force exerted upon the box as you push it up the ramp.
9. If the magnitude of two vectors and their resultant are the same, what is the angle between the two vectors?
Answers
The angle between the two vectors of the same magnitude would be 120 degrees to have the resultants the same.
answer: 120 degrees
6. how is the magnetic field of the earth affecting your experiment? be specific.
Answers
The Earth's magnetic field can impact your experiment by influencing the behavior of charged particles, affecting compass navigation, causing magnetic interference, or requiring additional controls and corrections in your experimental design.
1. Earth's magnetic field: The Earth has a magnetic field, which is mainly generated by electric currents in its outer core. This magnetic field affects many things on the planet, including compass navigation and the behavior of charged particles in the atmosphere.
2. Experiment setup: Depending on the nature of your experiment, the Earth's magnetic field could have a direct or indirect effect on the results. For example, if your experiment involves measuring the behavior of charged particles or using a compass to determine direction, the Earth's magnetic field would play a significant role in the outcome.
3. Magnetic interference: In some cases, the Earth's magnetic field can cause interference with sensitive electronic devices or instruments. This interference can lead to inaccurate measurements or unexpected results in your experiment. To minimize these effects, you may need to use magnetic shielding or perform your experiment in a location with minimal magnetic interference.
4. Correcting for the magnetic field: To account for the effect of the Earth's magnetic field on your experiment, you might need to include control tests or corrections in your experimental design. This could involve comparing results in different locations or orientations or using mathematical calculations to adjust for the magnetic field's influence on your measurements.
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suppose karl drives for 50 minutes. use the line of fit to determine the anticipated number of miles he drives.
Answers
The anticipated number of miles Karl drives can be determined by using the line of fit equation and plugging in the value of 50 minutes for the independent variable. The resulting value will be the predicted number of miles driven by Karl in 50 minutes.
To explain further, a line of fit is a line that represents the trend of a set of data points in a scatter plot. In this case, the line of fit equation was likely derived from a set of data points that show the relationship between the amount of time Karl drives and the corresponding distance he covers. By using this equation, we can estimate the number of miles he drives for a given amount of time.
For example, if the line of fit equation is y = 0.8x + 5, where y represents the number of miles driven and x represents the time in minutes, we can plug in x = 50 and solve for y to get:
y = 0.8(50) + 5 = 45
Therefore, the anticipated number of miles Karl drives in 50 minutes is 45.
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A man is holding an 8. 00-kg vacuum cleaner at arm's length, a distance of 0. 550 m from his shoulder. What is the torque on the shoulder joint if the arm is held at 30. 0
Answers
The torque on the shoulder joint is 21.41 N·m.
To find the torque on the shoulder joint, we need to first calculate the force being exerted by the vacuum cleaner and then multiply it by the distance from the shoulder to the vacuum cleaner. The force is the weight of the vacuum cleaner, which can be calculated as:
F = m * g
F = 8.00 kg * 9.81 \(m/s^2\)
F = 78.48 N
The torque can be calculated as:
τ = F * d * sinθ
τ = 78.48 N * 0.550 m * sin(30.0°)
τ = 21.41 N·m
Therefore, the torque on the shoulder joint is 21.41 N·m.
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The figure shows a horizontal pipe with a circular cross section whose diameter varies. The cross-sectional area at X is 3.0×10−4m2 and at Y is 0.60×10−4m2. Water of density 1000kg/m3 fills the pipe and flows through it at a constant rate of 2.4×10−4m3/s. The difference in pressure between X and Y is most nearly 750 Pa 750 Pa A 1600 Pa 1600 Pa B 7700 Pa 7700 Pa C 8320 Pa 8320 Pa D
Answers
By Bernoulli's Principle :
\(P_x+\dfrac{\rho v_x^2}{2}+\rho gz_x=P_y+\dfrac{\rho v_y^2}{2}+\rho gz_y\)
Since , pipe is horizontal so every point is at same height .
So , \(z_x=z_y\) .
The equation will reduced to :
\(P_x+\dfrac{\rho v_x^2}{2}=P_y+\dfrac{\rho v_y^2}{2}\) ..... 1 )
Also flow rate will be constant :
\(Q=A_xv_x=A_yv_y\)
\(v_x=\dfrac{Q}{A_x}\\\\v_x=\dfrac{2.4\times 10^{-4}}{3\times 10^{-4}}\ m/s\\\\v_x=0.8\ m/s\)
\(v_y=\dfrac{Q}{A_y}\\\\v_y=\dfrac{2.4\times 10^{-4}}{0.6\times 10^{-4}}\ m/s\\\\v_x=4\ m/s\)
Now ,
\(P_x-P_y=\dfrac{\rho v_y^2}{2}-\dfrac{\rho v_x^2}{2}\\\\P_x-P_y=\rho[\dfrac{ v_y^2}{2}-\dfrac{v_x^2}{2}]\\\\P_x-P_y=1000\times [\dfrac{ 4^2}{2}-\dfrac{0.8^2}{2}]\\\\P_x-P_y=7680\ Pa\)
Difference in pressure between X and Y is most near to 7700 Pa.
Hence, this is the required solution.
True or false, transient hypertrophy is a result of short-term edema accumulation in the muscle?
Answers
Answer:
True
Explanation:
Describe how an adult can teach a child to become a racist or bigot using positive reinforcement and negative punishment. Make sure you define the terms and apply the term to a real world example.
Answers
Answer:
by raising them in an environment in wich it is common and giving false information about other races to install bad stereo types and distrust in the child who will grow up to not know any better do to the dumb ignorant parent raised the same way
Explanation:
?????? thats all i got im not a politician BLM
In 1887, Heinrich Hertz investigated the phenomenon of light striking a metal surface, causing the ejection of electrons from the metal. The classical theory of electromagnetism predicted that the energy of the electrons ejected should have been proportional to the intensity of the light. However, Hertz observed that the energy of the electrons was independent of the intensity of the light. Furthermore, for low enough frequencies, no electrons were ejected, no matter how great the intensity of the light became. The following problem outlines the methods used to investigate this new finding in physics: the photoelectric effect.
Suppose there is a potential difference between the metal that ejects the electrons and the detection device, such that the detector is at a lower potential than the metal. The electrons slow down as they go from higher to lower electric potential; since they must overcome this potential difference to reach the detector, this potential is known as the stopping potential. To reach the detector, the initial kinetic energy of an ejected electron must be greater than or equal to the amount of energy it will lose by moving through the potential difference.
a. f there is a potential difference V between the metal and the detector, what is the minimum energy E_min that an electron must have so that it will reach the detector?
Express your answer in terms of V and the magnitude of the charge on the electron, e.
E_min =Ve
b. For the incident light to cause the ejection of an electron, the light must impart a certain amount of energy to the electron to overcome the forces that constrain it within the metal. The minimum amount of energy required to overcome these forces is called the work function phi. Different metals will have different values for phi. For an electron to reach the detector, the light must impart enough energy for the electron to overcome both the work function and the stopping potential.
Suppose that the light carries energy E_light. What is the maximum stopping potential V_0 that can be applied while still allowing electrons to reach the detector?
Express your answer in terms e, E_light, and phi.
V_0 =\frac{E_{light}-{\phi}}{e}
Correct
c. Classical electromagnetism predicted that V_0 should have increased as the intensity of the incident light increased. On the contrary, it was found that V_0 increased as the frequency f of the light increased. The voltage V_0 was found to obey the following linear relationship:
V_{0} = mf - b,
where m and b are numerical constants (representing the slope and the intercept, respectively). By comparing this equation to your answer from Part B, find an expression for the intercept b. (Notice that mf in this equation changes with different light but b is a constant of the metal.)
Express your answer in terms of phi and e.
d. In a 1905 paper that later won him a Nobel Prize, Albert Einstein postulated that the energy of light was proportional to its frequency. The constant of proportionality turned out to be Planck's constant h: E_{\rm light} = hf. Using your previous results, and the equation given in Part C, find an expression for h in terms of experimentally determinable quantities.
Express your answer in terms of the slope m and e.
Answers
To find an expression for the intercept b in the equation V₀ = mf - b, we can compare it to the expression for V₀ obtained in Part B.
From Part B, we have V₀ = (E_light - φ) / e.
Comparing this with the equation V₀ = mf - b, we can equate the corresponding terms:
(E_light - φ) / e = mf - b.
To find the expression for the intercept b, we isolate it on one side of the equation:
b = mf - (E_light - φ) / e.
Therefore, the expression for the intercept b in terms of φ and e is:
b = mf - (E_light - φ) / e.
Moving on to Part D, we are given that E_light = hf, where h is Planck's constant and f is the frequency of the light.
Substituting E_light = hf into the expression for the intercept b, we have:
b = mf - (hf - φ) / e.
Now, we need to express h in terms of experimentally determinable quantities.
Comparing the equation b = mf - (hf - φ) / e with the linear relationship V₀ = mf - b, we can equate the corresponding terms:
m = -h / e.
From this equation, we can solve for h:
h = -me.
Therefore, the expression for Planck's constant h in terms of the slope m and e is:
h = -me.
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heat is added to a 3.0 kg piece of ice at a rate of how long will it take for the ice at to melt? (for water and heat is added to a 3.0 kg piece of ice at a rate of how long will it take for the ice at to melt? (for water and 1,000 s 640,000 s 1.6 s 0.0 s
Answers
It will take 1.6s for the ice to melt.
First we have to write the expression for the heat balance equation for the system
Q supply = Qgain/
t= mLf/t
Here, m is the ice,
Lf is the latent heat of fusion
and t is the time taken to melt the ice.
Now we have to substitute the required value in the above expression to determine the value of time.
636 kJ/s = (3 kg)(334 kJ/kg) / tt =1.575 s
What is latent heat?
The heat or energy that is absorbed or released during a substance's phase shift is known as latent heat. It could go from a solid to a liquid or from a liquid to a gas, or vice versa. Enthalpy, a characteristic of heat, is connected to latent heat.
Therefore, the closest option is 1.6s
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A compact disc (CD) is read from the bottom by a semiconductor laser beam with a wavelength of 790 nm that passes through a plastic substrate of refractive index 1.80. When the beam encounters a pit, part of the beam is reflected from the pit and part from the flat region between the pits, so these two beams interfere with each other. What must the minimum pit depth be so that the part of the beam reflected from a pit cancels the part of the beam reflected from the flat region? (It is this cancellation that allows the player to recognize the beginning and end of a pit.)
Answers
To achieve interference cancellation between the part of the beam reflected from a pit and the part reflected from the flat region, we need to consider the phase difference between the two reflected beams.
The condition for interference cancellation is when the phase difference between the two beams is equal to an odd multiple of π (180 degrees). In other words, the two beams should be out of phase by half a wavelength.
Given that the semiconductor laser beam has a wavelength of 790 nm (which is equivalent to 790 × 10^(-9) m), we can calculate the minimum pit depth (d) required for interference cancellation using the following equation:
d = λ / (2n),
where λ is the wavelength of light in the medium (wavelength in vacuum divided by the refractive index of the medium) and n is the refractive index of the medium.
Substituting the values, we get:
d = (790 × 10^(-9) m) / (2 × 1.80).
Calculating this expression, we find:
d ≈ 219 × 10^(-9) m.
Therefore, the minimum pit depth required for interference cancellation is approximately 219 nm.
Hence, the minimum pit depth on the compact disc must be approximately 219 nm in order to achieve interference cancellation between the reflected beams.
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TRUE OR FALSE. When non-conservative forces are present, the amount of work done increases with the length of the path.
Answers
Answer:
True
Explanation:
When non-conservative forces are present, the amount of work done increases with the length of the path, this is true because, when a force is applied, the force does when and the non-conservative forces also do work. Since the non-conservative force work against the force applied, this tend to increase the net work done by the applied force to compensate for the loss in energy due to the work done by the non-conservative forces.
What kinds of bonds make up a formula unit of sodium chloride?
a.
Ionic bonds
b.
Covalent bonds
c.
1 ionic bond and 1 covalent bond
d.
Van der Waals forces
Answers
Answer:
a.ionic bond is kinds of bonds make up a formula unit of sodium chloride.
Answer:
A
Explanation:
The motion of the rocket labeled a is an example of motion with uniform (i.e., constant) __________. and nonzero
a. acceleration
b. velocity
c. position
d. time
Answers
The motion of the rocket labeled a is an example of motion with uniform (i.e., constant) velocity and non- zero acceleration.
A body when covers an equal distance with an equal interval of time, this condition of the velocity is known as uniform velocity. Or, we can say that when the direction and magnitude of speed of a body do not change with time, then the body is said to be at uniform velocity.
Having a non-zero acceleration means having any amount of acceleration whatsoever. This could be either positive acceleration or negative acceleration (a.k.a. deceleration).
An object experiences a non-zero acceleration when it is speeding up, slowing down, or remaining at the same speed while changing direction. Any of these three scenarios would result in an object's velocity changing since velocity is the change in an object's position over time, and a change in velocity means the object is experiencing acceleration.
Conversely, an object has zero acceleration when it either remains stationary or moving at a constant speed in a straight line. In both of these scenarios, the velocity of the object is constant, so there is no acceleration.
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why sounds hear clearly at night than day?
No one give proper answer.
Answers
when you carry the 2 and add the 3 its Z
How does the Coriolis effect impact the Gulf Stream and the Brazil Current?
Answers
Answer: The Coriolis effect results in bending the direction of surface currents to the right in the Northern Hemisphere and left in the Southern Hemisphere. The Coriolis effect causes winds and currents to form the circular patterns. The direction in which they spin depends upon the hemisphere in which they are present.Coriolis Effect is named after the French mathematician and physicist Gaspard-Gustave de Coriolis. It affects the weather patterns of an area, it affects the ocean currents, and it also affects air quality.
What does Boyle's law state about pressure and volume at a constant temperature and a constant pressure
Answers
Answer: Boyle's law states that when the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature.
Explanation:
Answer: Provided temperature remains constant, the volume and pressure of a gas are inversely related.
Explanation: Robert Boyle discovered that as long as the temperature of a gas remains constant, the relationship between the volume and the pressure of the gas is inverse. Basically, as the volume of a gas increases, its pressure decreases. As the pressure of the gas increases, its volume decreases.
You are planning to test the water quality at a reservoir at
different depths.
Task 1: Explain the planning that you will do
before you leave for Dam. What are the important aspects you must
consider?
Answers
Be sure to adhere to all safety precautions while performing the test, such as wearing protective gear, being cautious of the surroundings, and working in teams.
Ensure that you have obtained the necessary permits and permissions from relevant authorities to test the water at the reservoir. Be sure to adhere to all safety precautions while performing the test, such as wearing protective gear, being cautious of the surroundings, and working in teams.
Before leaving for the dam, planning is essential. It will allow you to test the water quality in a systematic and thorough way. The following are some important aspects that must be considered:
Test Equipment Selection - Choose suitable test equipment to test the water quality at various depths. This equipment must be calibrated, cleaned and checked for accuracy prior to testing. Also, take spare parts or additional equipment just in case something happens.Time and Duration - The testing time and duration should be planned to take into account all factors that may affect the test. This includes the weather, time of day, depth of the water and other environmental factors.
Depending on the location, the test should be done during the same period to ensure consistency.
Transportation - Make sure that the test equipment is safely transported and can be easily moved around the test site. Consider factors like access points, terrain, and the distance from the test site to the base. Make sure you take enough fuel for transportation.
Test Plan - Develop a test plan that outlines the testing procedure, test objectives, testing schedule, and personnel requirements. This plan will be your guide to ensure that the testing is done properly and within a specific time frame.
Record Keeping - During the test, record the data from all the measurements taken. Record-keeping is crucial for future analysis and comparisons. It is also important to have a detailed map of the site to track the exact location of each measurement taken.
Finally, ensure that you have obtained the necessary permits and permissions from relevant authorities to test the water at the reservoir. Be sure to adhere to all safety precautions while performing the test, such as wearing protective gear, being cautious of the surroundings, and working in teams.
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a plane is flying due west at 275 km/h and encounters a wind from the west at 80 km>h. what is the plane’s new velocity with respect to the ground in standard position?
Answers
The plane's new velocity with respect to the ground is 195 km/h, westward.
When a plane is flying in the presence of wind, its velocity with respect to the ground is the vector sum of its velocity relative to the air and the velocity of the wind. In this case, the plane is flying due west at 275 km/h and encountering a wind from the west at 80 km/h.
To find the plane's new velocity with respect to the ground, we need to add the velocity of the plane relative to the air and the velocity of the wind. The velocity of the plane relative to the air is given as 275 km/h due west, and the velocity of the wind is given as 80 km/h from the west.
Adding these two velocities gives us the plane's new velocity with respect to the ground:
Velocity with respect to ground = 275 km/h + 80 km/h = 355 km/h due west.
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the olympic swimmer swims to the end of the 50 m pool and back 4 times. calculate the distance covered.
Answers
Answer:
400 m
Explanation:
The swimmer swims 50 meters to one end of the pool but has to swim back therefore you double 50 which would be 100 meters. Then you have to multiply 100 by 4 since the swimmer did it 4 times.
What type of machine is used to measure the location of an earthquake epicenter.
Answers
Answer:
Seismometer
Explanation:
Seismometer measures Earth quake epicenter while seismograph measures Earth quake size
THe emf of a cell, E=3V which is balanced across l =100cm of a potentiometer wire. The cell is shunted by the resistance =30 ohm. The required balance length of shunt is 80cm. What's the value of current flowing through the shunt?
Answers
The value of the current flowing through the shunt is 0.08 A.
What's the value of current flowing through the shunt?The value of the current flowing through the shunt is calculated by applying the following formula.
I = V/R
where;
V is the voltage through the shuntR is the resistance of the shuntThe voltage flowing through the shunt is calculated as;
V/V' = L/L'
where;
V is the shunt voltageV' is the potential difference across potentiometerL is length of shuntL' is total length of wireV/3 = 80/100
V = (3 x 80 ) / 100
V = 2.4 V
The current flowing through the shunt is calculated as;
I = 2.4 / 30
I = 0.08 A
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PLEASE HELP!! NO LINKS OR RANDOM WORDS!! If you were looking at the Moon from space (so that you could see all sides of it), how much of it would be lit by the sun at any given time?
1) All of it
2) Half of it
3) It varies depending on the Moon's phase.
4) It varies depending on the time of the year.
Answers
Answer:
3) It varies depending on the Moon's phase.Explanation:
when a car drives off a cliff it rotates forward as it falls. for a higher speed off the cliff, discuss whether it will rotate more, or less. (consider the time that the unbalanced torque acts.)
Answers
When a car drives off a cliff and rotates forward as it falls, the rotation is caused by the unbalanced torque acting on the car. The torque is a result of the gravitational force acting on different parts of the car, creating a net torque that causes the car to rotate.
The amount of rotation experienced by the car will depend on several factors, including the speed at which it drives off the cliff. Let's consider the situation for a higher speed off the cliff and discuss whether it will rotate more or less:
1. Higher Speed:
When the car drives off the cliff at a higher speed, it will have a greater momentum and kinetic energy. As a result, the car will experience a larger force due to the impact with the ground and the air resistance. This larger force will generate a larger unbalanced torque, contributing to a greater rotation of the car.
2. Time of Unbalanced Torque:
Another factor to consider is the time that the unbalanced torque acts on the car. The torque acting on the car during the fall will depend on the distance from the center of mass of the car to the point of rotation (e.g., the front wheels). If the car has a longer nose or a larger moment arm, it will experience a larger torque for the same force applied. This longer duration of unbalanced torque acting on the car will result in a larger rotation.
Considering these factors, it can be concluded that for a higher speed off the cliff, the car will rotate more. The increased momentum, larger force, and longer duration of the unbalanced torque will contribute to a greater rotation of the car as it falls.
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A system has a pressure of 5 N/m2
If a force of 2000N is applied, what is the area that the force is applied to?
Give the units.
Answers
400 m2
Explanation:
Pressure = Force ÷ Area
5 N/m2 = 2000 N ÷ A
A = 2000 N ÷ 5
= 400 m2
If a force of 2000N is applied, the area that the force is applied to is 400 m²
What is force?The word "force" has a specific meaning in science. At this level, calling a force a push or a pull is entirely appropriate. A force is not something an object "has in it" or that it "contains."
One thing experiences a force from another. There are both living things and non-living objects in the concept of a force.
The amount of force applied to a certain region is referred to as pressure. The force per unit area is called pressure. F in this condensed version of the equation stands in for the force, which is expressed in newtons.
Given that the pressure of 5 N/m²
Force is 2000N
Pressure = Force ÷ Area
5 N/m² = 2000 N ÷ A
A = 2000 N ÷ 5 = 400 m²
Therefore, the area that the force is applied to is 400 m².
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