When two items come into close proximity, thermal energy moves from the warmer object (which has faster-moving particles) to the colder object (with slower-moving particles).
Which thermal energy transfer direction is correct?First, heat is transferred from the lower-temperature object to the higher-temperature object, then it is transferred back to the lower-temperature object, and so on, until the objects are in thermal equilibrium.
What is the true statement concerning heat radiation?
Thermal radiations have a frequency range in the infrared and are electromagnetic in nature. All bodies that have an absolute temperature that is not zero emit these. Since they are electromagnetic, heat radiations can bounce off of them and move through space at the speed of light. All of the statements are true.
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an electron in a cathode-ray tube is accelerated through a potential difference of 10 kv, then passes through the d
The field strength that will deflect the electrons is 2.93*10^-3 T or 2.93mT.
Calculation:
from figure
sin(o) =d/r
r =d/sin(o) =1.6/sin8 =11.5 cm
from conservation of energy
qV =(1/2)mv^2
[tex](1.6*10^-19)(10*10^3)=(1/2)(9.11*10^-31)*v^2[/tex]
[tex]v=5.93*10^7 m/s[/tex]
and
r = mv/qB
= [tex]B =mv/qr =(9.11*10^-31)*(5.93*10^7)/(1.6*10^-19)(11.5*10^-2)[/tex]
B = 2.93*10^-3 T or 2.93mT.
An electron is a subatomic particle with a negative elementary charge. Electrons belong to the first generation of the leptonic particle family and are generally considered elementary particles because they have no known composition or substructure. In the standard model of particle physics.
Electrons are the smallest particles that make up an atom and have a negative charge. In neutral atoms, the number of protons and electrons is the same, and are considered elementary or elementary particles. electrons belong to a group of elementary particles called leptons.
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Which of the following statements are true about an object in two-dimensional projectile motion with no air resistance? (There could be more than one correct choice.) A) The speed of the object is constant but its velocity is not constant. B) The acceleration of the object is constant but its object is + g when the object is rising and -g when it is falling. C) The acceleration of the object is zero at its highest point. D) The speed of the object is zero at its highest point. E) The horizontal acceleration is always zero and the vertical acceleration is always a non-zero constant downward
The horizontal acceleration is always zero and the vertical acceleration is always a non-zero constant downward.
What is a acceleration ?Acceleration is the rate at which the speed and direction of a moving object vary over time. A point or object going straight ahead is accelerated when it accelerates or decelerates.The rate at which an object's velocity with respect to time changes is referred to as acceleration in mechanics. They are vector quantities, accelerations. The direction of the net force acting on an object determines the direction of its acceleration.Frictional resistance to its motion in the horizontal direction is a constant resistance, hence the acceleration, even if it is negative acceleration, is a constant in the horizontal plane of motion.To learn more about Acceleration refer :
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students attach a force probe in the middle of string a to measure ta and then use a different force probe to provide the applied force f to the box of mass m1. with the box of mass m3 held in place by one student, a second student pulls to the left on the force probe that provides the applied force f. as the second student pulls with a steady force, and with the boxes remaining at rest, the following pairs of readings from the two force probes are recorded at different times. Time F(N) TA (N) ti 10.6 11 10 10.4 10.2 10.8 10 11 t5 10.6 11 Based on the measurements above, how do the magnitudes of the two force quantities compare? The two quantities exactly agree numerically. The two quantities agree within experimental uncertainty but do not exactly agree numerically. The two quantities disagree by an amount that is larger than the experimental uncertainty. The two quantities cannot be compared because the two force probes have different levels of precision.
The magnitudes of the two force quantities after comparing the two quantities agree within experimental uncertainty but do not agree numerically.
What is applied force?One of the most prevalent forms of force is applied force, which is the force we exert on objects with our hands, legs, or any other item. As an illustration, push a chair with some force to move it in a certain direction.
According to Newton's second equation of motion, an object's force is equal to its mass times its acceleration, or F = m × a.
Use Newtons for force, kilograms for mass, and meters per second squared for acceleration when applying this formula.
Given that, time F(N) TA(N)
t₁ 10.6 11
t₂ 10.4 10
t₃ 10.2 10
t₄ 10.8 11
t₅ 10.6 11
Thus, The mean value of F is: 10.52 N
The mean value of TA is: 10.6 N
So, the two quantities agree within experimental uncertainty but do not agree numerically.
Thus, the two quantities cannot be compared because the two force probes have different levels of precision.
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An 7.80-mF capacitor is connected across an AC source with an rms voltage of 71.0 V oscillating with a frequency of 30.0 Hz. What are the following for this circult? (a) capacitive reactance (b) rms current (c) maximum current
a)The capacitive reactance is 680 ohms.
[tex]X_{c}=1/2\pi fC[/tex]
[tex]X_{c}=1/2\pi *30*7.8*10^{-6}[/tex]
[tex]X_{c}=680\\[/tex]
b)The rms current is 0.10 amperes.
[tex]I_{rms}=V_{rms}/X_{c}[/tex]
[tex]I_{rms}=71/680[/tex]
[tex]I_{rms}=0.10A[/tex]
c)The maximum current in the circuit is 0.147 amperes.
[tex]I_{max}=\sqrt{2} *I_{rms}[/tex]
[tex]I_{max}=\sqrt{2} *0.10[/tex]
[tex]I_{max}=0.147A[/tex]
What is capacitive reactance?
The measure of the opposition to alternating current by the capacitor is called Capacitive Reactance. The unit of Capacitive Reactance is Ohms-like resistance. The symbol of Capacitive Reactance is XC
What is the capacitive reactance formula?
Xc = 1/2πfc
XC is the capacitive reactance, π is a constant with the value of 3.14, f is the frequency, and c is the capacitance.
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consider medical x rays that are taken with electromagnetic waves having a wavelength around 0.14 nm in air. What is the frequency of such waves? Express your answer with the appropriate units
Frequency of such waves is 2.14 x 10¹⁸ Hz.
Given
wavelength λ = 0.14 *10^⁻⁹ m
ν =c/λ = (3×10⁸)/(0.14 x 10⁻⁹) =2.14 x 10¹⁸ Hz
The relation between frequency, velocity and wavelength of a wave is given by,
ν=v/λ
Where ν is the frequency,
v is the speed of the wave and
λ is the wavelength of the wave.
The angular frequency of the wave is given by,
ω=2π
ν=2πT
Electricity can be static, like the energy that can make your hair stand on end. Magnetism can also be static, as it is in a refrigerator magnet. A changing magnetic field will induce a changing electric field and vice-versa—the two are linked. These changing fields form electromagnetic waves. Electromagnetic waves differ from mechanical waves in that they do not require a medium to propagate. This means that electromagnetic waves can travel not only through air and solid materials, but also through the vacuum of space.
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A fighter jet is traveling at 515m/s directly away from a communication antenna that broadcasts at 406 MHz. What change in frequency does the fighter jet observe?
The fighter jet notices a change in frequency of 697 Hz.
rom Doppler's effect, f' = f(1 - u/c)
Here, c denotes the speed of light, u is the speed of the fighter jet, and f is the frequency of the antenna's broadcast.
so, f' = f(1 - u/c)
⇒f'/f = 1 - u/c
⇒(f - f')/f = u/c
⇒∆f = fu/c
so change in frequency, ∆f = fu/c
now f = 406 × 10⁶ Hz , u = 515 m/s and c = 3 × 10^8 m/s
so, ∆f = (406 × 10^6 × 515)/(3 × 10^8)
= 69696.67 × 10^-2
= 696.9667 Hz ≈ 697 Hz
Because of this, the fighter jet measured a 697 Hz change in frequency.
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A fighter jet is traveling at 515m/s directly away from a communication antenna and that broadcasts at 406MHz.
The antenna is a device that is used for transmitting and receiving signals, which represent some information. antennas play a major role in the case of wireless communication system as the antenna effectively converts electromagnetic waves to electronic signals. antennas are the basic components of any electrical circuit, because it provides interconnecting links between transmitter and free space or free space and receiver.
The purpose of an antenna is to collect and convert electromagnetic waves to electronic signals. In communication antenna, the same antenna can be used for both transmission and reception.
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This painting represents the Milky Way Galaxy as it would appear edge-on from a distance. Label the indicated features; be sure to pay attention to where the leader lines are pointir Drag the labels to the appropriate blanks on the diagram. You may use a label more than once. View Available Hint(s) Reset Help bulge globulan clusters halo disk
The indicated features from top to bottom:
spiral armbulgediskIt is called a spiral galaxy because it looks like a spinning windmill when viewed from above or below. The Sun is in one of the spiral arms about 25,000 light-years away from the center of the galaxy.
Our solar system is in a galaxy called the Milky Way which is tightly packed with 100 to 400 billion other stars many of which have planets of their own. The Milky Way got its name because it looks like a stream of spilled milk across the sky. An elliptical galaxy is a type of galaxy with an almost featureless image that is nearly elliptical and smooth.
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electromagnetic plane wave 0 points possible (ungraded) an electromagnetic plane wave is propagating in vacuum, and has a magnetic field given by: where and are positive quantities.
Electromagnetic waves propagate not only in air and solids but also in vacuum space.
Electromagnetic waves are different from sound waves because they don't need molecules to move. This means that electromagnetic waves can penetrate air solids and even outer space. Both electric and magnetic fields are sinusoidal in-plane electromagnetic waves. As you know, a sine wave has zero mean.
These are transverse waves and do not require a medium to travel. They do not obey the laws of reflection and refraction. Magnets do not require gravity or air. Instead, their power comes from the electromagnetic fields they generate themselves. A type of magnet called an electromagnet requires electricity to function. However, if you can run an electric current in space, it will still work.
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Which of these can be dissipated?
Choose all that are correct.
A: chemical b: thermal c:light d: sound e: elastic
All of the following can be dissipated
thermal energylightsoundelastic energyChemical energy cannot be dissipated, but it can be converted into other forms of energy through chemical reactions.
Answer:
b: thermal c:light d: sound
Explanation:
whatever can be converted into heat
Miguel (m=72) and Fernando (89 kg) board the bumper cars at the local carnival. Miguel is moving at a velocity of 4 m/s when he rear-ends Fernando who is at rest in his path. Fernando and his 125-kg car lunge forward at 2 m/s. Determine the post-collision velocity of Miguel and his 125-kg car.
The post collision velocity of miguel and his car was found to be -10m/s
define collision ?
A collision in physics is any situation in which two or more bodies quickly exert forces on one another. Despite the fact that the most common usage of the word "collision" refers to situations in which two or more objects clash violently, the scientific usage of the word makes no such assumptions.
The following are a few instances of physical encounters that scientists might classify as collisions:
Legs of an insect are said to crash with a leaf when it falls on one.
Every touch of a cat's paws with the ground when it strides across a lawn is seen as a collision, as is every brush of its fur with a blade of grass.
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calculate the larmor precession frequency of a hydrogen nucleus in a 5.30 t magnetic field. assume that the shielding coefficient is zero. give your answer in hz using 5 significant digits relative to (x.xxxx).
The larmor precession frequency is [tex]2.256 * 10^8 Hz[/tex]
What is larmor precession frequency?
The rate at which the proton's magnetic moment precesses around the external magnetic field is known as the Larmor or precessional frequency in MRI. The magnetic field's strength, Bo, and the frequency of precession are correlated.
we know
f = γB (1 - σ)
where,
f = frequency
B = applied magnetic field
γ = gyromagnetic ratio
σ = shielding coefficient
For hydrogen nucleus (1H) = 42.58MHz/T
B = 5.30T
Given σ = 0 (assume)
Substituting the values in equation:
f = 42.58 * 5.30(1 - 0)
f = 42.58 * 5.30 * 1
f = 225.674MHz
f = [tex]2.256 * 10^8 Hz[/tex]
The larmor precession frequency is [tex]2.256 * 10^8 Hz[/tex]
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find the tension in each cord in the following figure, if the weight of the suspended object is 100 n. (make a free body diagram).
T a = 573.77 N and T b = 702.7 N are the tensions in the system's cords A and B, respectively.
What is meant by tension?A rope, string, or cable that is stretched under an applied force develops a force known as a tension force in physics. In the opposite direction of the force imparted to the rope or cable, tension is exerted along its whole length. Other names for tension include stress, tensity, and tautness.
The force transferred through a rope, string, or wire when pushed by forces acting from opposite sides is referred to as tension. The tension force is applied along the entire length of the wire and exerts an equal amount of strain on the bodies at each end.
Something can stretch under tension. Something gets squeezed together through compression. Only materials having the ability to resist forces are useful. Similar to how water moves through a pipe, force moves through a material.
We have to solve the system of equations:
- T a × cos 60° + T b × sin 45° - 210 N = 0
- T a × sin 60° + Tb cos 45° = 0
------------------------------------------------------
- 1/2 T a + √2 / 2 T b = 210 N
- √3 / 2 T a + √ 2 / 2 T b = 0 / * ( - 1 )
---------------------------------------------------
- 1/2 T a + √2 / 2 T b = 210 N
√ 3 / 2 T a - √2 / 2 T b = 0
----------------------------------------
T a ( √3 / 2 - 1 / 2 ) = 210 N
0.366 T a = 210 N
T a = 210 N : 0.366
1 ) T a = 573.77 N
Ta × √3 / 2 = T b × √ 2 / 2
T b = ( 573.77 × 1.732 ) : 1.4142
2 ) T b = 702.7 N
The complete question is:
Find the tension in each cord in the figure if the weight of the suspended object is w = 210N
A) Find the tension in the cord A for system (b).
B) Find the tension in the cord B for system (b).
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lucy has three sources of sound that produce pure tones with wavelengths of 36 cm , 60 cm , and 92 cm . she also has an assortment of narrow tubes that are closed off at one end but open at the other. after experimenting, lucy notices that each tone will resonate with tubes of some lengths but not with others. for each wavelength, determine which tube lengths, if any, will resonate with sound of that wavelength. you are currently in a labeling module. turn off browse mode or quick nav, tab to items, space or enter to pick up, tab to move, space or enter to drop. wavelength of sound: 36 cm 60 cm 92 cm length of tube: answer bank. g
When α = 36 then L= 9cm ,27 cm,45 cm, 63cm ; when α = 60 then L= 15cm,45cm,75cm,105cm and when α = 92 then L= 23cm, 69cm, 115cm, 161cm. α is wavelength and L is the length of tubes.
What is wavelength?In physics, wavelength is the spatial period of a periodic wave and the distance over which the shape of the wave repeats.
L=( 2n+1)* α/4
when α = 36
L= (2n+1) * 36/4
= (2n+1) *9
when n= 0,1,2,3
L= 9cm ,27 cm,45 cm, 63cm
when α = 60
L= (2n+1) * 60/4
= (2n+1) * 15
when n= 0,1,2,3
L= 15cm,45cm,75cm,105cm
when α = 92
L= (2n+1) * 92/4
= (2n+1) * 23
when n= 0, 1, 2,3
L= 23cm, 69cm, 115cm, 161cm
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Which of the following telescopes is best suited for studying the hottest intergalactic gas(10 million K) in a cluster of galaxies?
Chandra X-ray Telescope
Chandra X-ray telescope is the one that is best suited for studying the hottest intergalactic gas in a cluster of galaxies.
Intergalactic gas is found in space that exists in-between the cluster of galaxies. This space is known as intergalactic space. An intergalactic gas is a very hot gas that emits X-rays. Temperature is very high where intergalactic gases exists in the universe. The intergalactic gases found in the universe are hydrogen and helium gases.
Chandra X-ray telescope is a successful mission of NASA that is programmed to detect the gases that emit X-rays. Therefore, intergalactic gases can easily be detected by this telescope. It is a powerful design that can also detect hot regions between the galaxies. This telescope was launched in the space by NASA, in the year 1999.
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A runner can jog at 5m\s how many laps or a 400m track could she complete in 4 minutrs?
Answer:
3 laps
Explanation:
1 minute = 60 seconds.
4 minutes * 60 seconds/ 1 minute = ==> use seconds-minutes conversion
factor to solve for the number of
seconds in 4 minutes
4 * 60 seconds/1 = ==> cancel the minutes unit
4 * 60 seconds = 240 seconds in 4 minutes
Now solve for the number of meters completed in 240 seconds by using the meters-seconds conversion
240 seconds * 5 meters/1 second=
240 * 5 meters/1= ==> cancel the seconds unit
240*5 meters = 1200 meters
Now solve for the number of laps equivalent to 1200 meters by using the laps-meters conversion
1200 meters * 1 lap/400 meters =
1200 * 1 lap/400 = ==> cancel the meters unit
1200 laps/400 =
1200/400 laps = 3 laps
Choose an example of a vertical motion with a negative velocity and a negative acceleration.
A body falling down towards earth, when upward direction is considered as positive direction got negative velocity and acceleration.
What is negative velocity and negative acceleration?Negative velocity = You move backwards. Negative acceleration = You slow down or you go faster in the backwards direction.You are standing on top of a building with certain height, H and you select height of building to be positive. If you throw a stone upward it's displacement is increasing and velocity is decreasing, both of them are positive and it is attracted towards earth by an acceleration so it is downward. SO it's value is negative.After reaching the maximum height the stone comes down and it's velocity increases in the downward direction, in this situation it is having negative velocity and and negative acceleration.An object which moves in the negative direction has a negative velocity. If the object is speeding up then its acceleration vector is directed in the same direction as its motion (in this case, a negative acceleration).Negative Velocity: An object has negative velocity if its position is changing in the negative direction as time increases. If examining a graph of displacement vs. time, the velocity is negative whenever the graph has negative slope.To learn more about negative acceleration refer to:
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substance a has a high melting point, is soluble in water, is a conductor of electricity when dissolved in water but not as a solid, and has a hard surface. stsate the type of bonding you would expect to find in this substance
The type of bonding in the substance is an ionic bond, as the substance is a non-conductor of electricity in the solid state but is a conductor when melted or in a liquid state.
When the complete transfer of some electrons takes place from one atom to another atom, the kind of bond is ionic bond. The atom which loses one or more electrons becomes a cation. It is a positively charged ion. The atom which gains one or more electrons becomes an anion. It is a negatively charged ion.
Ionic bonding is very strong. When the substance is in a solid state, bond force does not leave free electrons to conduct electricity. When dissolved in water, the bond breaks, and some electrons are freed to conduct electricity.
Water is a polar covalent compound that can help in breaking of ionic bonds.
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xl and xc can be combined to favor one particular frequency, the resonant frequency to which the lc circuit is tuned quizledt
It will give resonant frequency when [tex]X_{c}= X_{l}[/tex].
The frequency on which Inductive Reactance ([tex]X_{l}[/tex]) and Capacitive Reactance([tex]X_{c}[/tex]) becomes equals that is called Resonant Frequency. Resonance Effect is also called tuning effect.An LC circuit, also known as a tank circuit, a tuned circuit, or a resonant circuit, is an electric circuit that consists of a capacitor marked by the letter “C” and an inductor signified by the letter “L.”These circuits are used to generate signals at a specific frequency or to accept a signal from a more complex signal at a specific frequency.LC circuits are basic electronics components found in a wide range of electronic devices, particularly radio equipment, where they are employed in circuits such as tuners, filters, frequency mixers, and oscillators. The basic purpose of an LC circuit is to oscillate with the least amount of damping possible.To know more about circuits visit:
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Most of the energy you expend in cycling is dissipated by the drag force. If you double your speed, you increase the drag force by a factor of 4. This increases the power to cycle at this greater speed by what factor?
A. 2 B. 4 C. 8 D. 16
The power is increased by factor of 8 beacuse of the energy consumed in increasing the drag force.
Power is the rate of energy release. CCCs have high energy, but the TNT explosion has high power. It is defined as the energy used per second. It is the rate of energy release,
power = energy/time
The most common unit for power is the watt, named after James Watt who truly developed the science of the steam engine. It was the most powerful motor of its time, and the “high tech” of the 1700s. The watt is defined as one joule per second:
1 Watt = 1 W = 1 watt = 1 joule per second
1 kW = 1 kilowatt = 1000 joules per second
The value of TNT is that even though it has less energy per gram than chocolate chip cookies, it has greater power (since it can convert its limited energy to heat in a few millionths of a b). Of course, it can’t deliver this power for very long because it runs out of energy.
Power (P) = F v
Given,
where n is new
Vn = 2v
And Fn = 4F
So Pn = Fn*Vn
= 4F *2v =
= 8 (Fv) = 8 P
So, this increases the power by factor of 8.
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It's nighttime, and you've dropped your goggles into a 3.2-m-deep swimming pool. If you hold a laser pointer 1.2 m above the edge of the pool, you can illuminate the goggles if the laser beam enters the water 1.8 m from the edge. Part A How far are the goggles from the edge of the pool? Express your answer to two significant figures and include the appropriate units. μΑ ? d= Value Unit
The distance of the goggle from the edge is 4.7 m
What is the Snell's law in physics?According to Snell's law, "For light of a particular colour and for the given pair of media, the ratio of the sine of the angle of incidence to the sine of the angle of refraction is a constant."Snell's Rule No. 1: The incident ray, the refracted ray, and the normal ray are all said to be on the same plane.To take the shortest path across a system, a ray shifts its direction as it passes from one refractive index medium to another. We refer to the light beam as being reflected each time a light ray crosses a barrier along its path and bounces back at an angle.Given data :
Laser angle with water surface is given by: Tan α = 1 / 1.8= 0.55
α = 26.56°
Laser angle with Normal = 90 – 26.56 = 63.44 °
Assuming a red laser, refractive index in water is 1.331.
Angle of refraction in water is given by:
Ref Ind = Sin i / Sin r
1.331 = Sin 63.44 / Sin r
Sin r = 0.8945 / 1.331 = 0.6721
Angle r = 42.22°
For the path in water:
Tan 42.22 = x / 3.2
x = 2.9m where x is the lateral displacement of the laser ince it hits the water
So the goggles are 1.8 + 2.9 = 4.7 m from edge of pool
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T/F which of the following best describes the energy transformations that occur when a flashlight that runs on batteries is turned on?
The chemical energy in the batteries is transformed into electrical power when the lighting is put on, which goes through the wires of the flashlight. Then, light and heat energy are created from this electrical energy.
What are two sorts of batteries?Batteries can be divided into two categories: main and secondary. Primary batteries cannot be refilled because they are "single use."Examples of primary batteries include dry phones and (most) alkaline batteries. The second type, which is rechargeable, is a secondary battery.
What exactly are batteries used for?An object that stores energy and releases it by transforming chemical energy into electrical energy is a battery. Typical batteries typically employ one or more fuel cells to chemically generate electricity.
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How did great britian changed the science of forces
Shortage of wood and the abundance of convenient coal deposits and Commercial-minded aristocracy of the great Britain changed the science of forces.
What is the Spread of the Industrial Revolution?Britain attempted to keep its manufacturing processes a secret, but people came to learn about them and brought the knowledge home with them.
Sometimes they used rowboats to smuggle the machines to nearby nations. Belgium, Switzerland, France, and the states that would become Germany were the first nations after Britain to build factories and railroads. Industrialization proven to require the establishment of a national train network. Switzerland's railroads were built in 1847, Belgium's in 1834, France's in 1842, and Germany's in the 1850s.
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What is the magnitude B of the magnetic field at the location of the charge due to the current-carrying wire? Express your answer in teslas. View Available Hint(s) V AED + ? BB = V\rm{T}) Learning Goal:
To practice Problem-Solving Strategy 24.2 Magnetic force problems A long straight horizontal wire carries a current I = 1.20 A to the left. A positive 1.00 C charge moves to the right at a distance 5.00 m above the wire at constant speed v = 5000 m/s. (Figure 1) What are the magnitude and the direction of the magnetic force on the charge?
The magnitude of the magnetic field on the charge: 4.8 × 10⁻⁸ T
What is magnetic field?The magnetic field is a zone surrounding a magnetic substance or a moving electric charge where magnetism acts. Moving electric charges and magnetic dipoles combine to form a magnetic field, which acts as a force field on other adjacent moving charges and magnetic dipoles.
B and H are used to denote the magnetic field. The SI units for B and H are Newtons per meter per ampere or Teslas, respectively.
Here, by right hand rule, the magnetic field around the wire which will be into the location.
Thus, the magnitude of the magnetic field,
B = μ(0)I/2πr
or, B = [(4π × 10 ⁻⁷) × (1.20)] ÷ [2π(5.00)]
or, B = 4.8 × 10⁻⁸ T
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The filament of a 75-W light bulb is at a temperature of 3300 K. Assuming the filament has an emissivity e = 0.9, find its surface area. (Use s = 5.6696 10-8 W/m2 · K4 for the Stefan-Boltzmann constant.)
Surface area is 1.10 × 10^-5 .
Stefan-Boltzmann law, statement that the total radiant heat power emitted from a surface is proportional to the fourth power of its absolute temperature.All bodies radiate energy W depending on temperature T, according to the Stefan-Boltzmann law W = ε σT4 where emissivity ε is equal to 1 for black bodies and less than 1 for grey bodies, σ being the Stefan constant.
From Stefan's law, the power radiated by an object at absolute
temperature T and surface area A is POAT, where a=5.6696 × 10
W/m²K and e is the emissivity. Thus, the surface area of the filament
must be
A =75 W / (5.6696x10 )(1.0 )(3300) = 1.10 * 10^-5
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Two identical flasks contain O2 and H2 gas, respectively, at the same temperature and pressure. In comparing the two flasks, which of the following is not a true statement.(a) the average kinetic energy of H2 is greater than that of 02(b) the average speed of a H2 molecule is greater than that of an O2 (c) the number of impacts/(unit area)/(unit tim) are different for the two gases(d) the number of moles is the same e) total mass of each gas is different
Statement a is not True as Kinetic theory of gas clearly suggest that the average Kinetic Energy of gas particles is proportional to Absolute temperature and all gases a the same temperature have the same Average kinetic Energy.
What is kinetic energy ?
The energy an item has as a result of motion is known as kinetic energy in physics. It is described as the effort required to move a mass-determined body from rest to the indicated velocity. The body keeps the kinetic energy it acquired throughout its acceleration unless its speed changes.
A) Flask B is at a higher pressure than flask A.
B) The densities of both gases are the same.
C) Both flasks have the same amount of gas molecules.
D) The pressures of the flasks are the same.
E) Flask B contains more moles of gas than flask A.
F) Both flasks have molecules with the same average kinetic energy.
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what happens to the atomic number of an atom when the number of neutrons in the nucleus of that atom increases? (2 points) it decreases it increases it doubles it remains the same
The atomic number of an atom when the number of neutrons in the nucleus of that atom increases, it remains the same.
What is meant by atomic number?The charge number of an atomic nucleus is the chemical element's atomic number, also known as nuclear charge number (symbol Z). This is equivalent to the proton number (np), or the number of protons present in the nucleus of each atom of that element, for conventional nuclei. Ordinary chemical elements can be uniquely identified using their atomic number. The atomic number and the number of electrons are both equal in a regular, uncharged atom.Isotopes are atoms with the same atomic number but distinct neutron numbers, and thus, varying mass numbers. The standard atomic weight of an element is determined by the average isotopic mass of an isotopic mixture for that element in a particular environment on Earth. A little over three-quarters of naturally occurring elements exist as a mixture of isotopes (see monoisotopic elements).Learn more about atomic number refer to :
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The energy released from condensation in thunderstorms can be very large. Calculate the energy released into the atmosphere for a small storm of radius 1.8 km, assuming that 2.7 cm of rain is precipitated uniformly over this area. The heat Q required to change the phase of a sample of mass m is,
Q = mLv
Where, Lv is the latent heat of vaporization.
The heat that must be applied to a unit quantity of material in order to shift it from the liquid to the vapor phase without a change in temperature is known as the latent heat of vaporization or evaporation (Lv).
Describe the latent heat of vaporization using an example?
The energy needed to convert stuff from a liquid to a vapor without affecting temperature is known as the latent heat of vaporization. The change of liquid water particles into vapors occurs, for instance, when a water kettle is brought to a boil.
In plain English, what is latent heat of vaporization?
Latent heat of vaporization is the quantity of heat required to transform a unit mass of a liquid substance into a gaseous phase under conditions of constant temperature.
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g an object is placed in a fluid and then released. assume that the object either floats to the surface (settling so that the object is partly above and partly below the fluid surface) or sinks to the bottom. (note that for parts a through d, you should assume that the object has settled in equilibrium.)
Part A Consider the following statement The magnitude of the buoyant force is equal to the weight of fluid displaced by the object Under what circumstances is this statement true? Hints O for every object submerged partially or completely in a fluid O only for an object that is floating O only for an object that is fully submerged and is sinking O for no object submerged in a fluid Submit My Answers Give Up Part B Consider the following statement The magnitude of the buoyant force is equal to the weight of the amount of fluid that has the same al volume as the object. Under what circumstances is this statement true? Hints O for an object that is partially submerged in a fluid O only for an object is floating O for an object completely submerged in a fluid O for no object partially or completely submerged in a fluid Submit My Answers Give Up Part C Consider the following statement The magnitude of the buoyant force equals the weight of the object. Under what circumstances is this statement true?
Part A: The statement "The magnitude of the buoyant force is equal to the weight of the fluid displaced by the object" is true only for an object that is floating.
This is because, when an object is floating, it is in equilibrium with the fluid; the buoyant force acting on the object is equal to the weight of the fluid it displaces, which is also equal to the weight of the object. This means that the buoyant force is equal to the weight of the object.
Part B: The statement "The magnitude of the buoyant force is equal to the weight of the amount of fluid that has the same volume as the object" is true for an object that is partially submerged in a fluid.
This is because, when an object is partially submerged, the buoyant force acting on it is equal to the weight of the amount of fluid that has the same volume as the object. Since the buoyant force is equal to the weight of the object, this statement is true.
Part C: The statement “The magnitude of the buoyant force equals the weight of the object" is false for any object partially or completely submerged in a fluid.
This is because the buoyant force acting on the object is not equal to its weight; rather, the buoyant force acting on the object is equal to the weight of the fluid it displaces, which is less than the weight of the object. Therefore, this statement is false.
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Complete question:
G an object is placed in a fluid and then released. assume that the object either floats to the surface (settling so that the object is partly above and partly below the fluid surface) or sinks to the bottom. (note that for parts a through d, you should assume that the object has settled in equilibrium.)
Part A Consider the following statement The magnitude of the buoyant force is equal to the weight of fluid displaced by the object Under what circumstances is this statement true? Hints O for every object submerged partially or completely in a fluid
O only for an object that is floating
O only for an object that is fully submerged and is sinking
O for no object submerged in a fluid
Part B Consider the following statement The magnitude of the buoyant force is equal to the weight of the amount of fluid that has the same al volume as the object. Under what circumstances is this statement true? Hints
O for an object that is partially submerged in a fluid
O only for an object is floating
O for an object completely submerged in a fluid
O for no object partially or completely submerged in a fluid
Submit My Answers Give Up
Part C Consider the following statement The magnitude of the buoyant force equals the weight of the object. Under what circumstances is this statement true?
O for an object that is partially submerged in a fluid
O only for an object is floating
O for an object completely submerged in a fluid
O for no object partially or completely submerged in a fluid
A person is lying on a diving board 2.50 above the surface of the water in a swimming pool. The person looks at a penny that is on the bottom of the pool directly below her. The penny appears to the person to be a distance of 7.00 from her.
Part A
What is the depth of the water at this point?
Express your answer with the appropriate units.
S =
The depth of the water at this point by using water refractive index 1.33 is 5.985m.
What is refractive index (index of refraction)?In optics, the refractive index of an optical medium is a dimensionless number that gives the indication of the light bending ability of that medium. The refractive index determines how much the path of light is bent, or refracted, when entering a material.
Distance that is below water (as seen by diver)
= 7 - 2.5 = 4.5m
apparent depth would be 4.5m
using the formula
apparent depth = real depth / refractive index
real depth = 4.5 * 1.33= 5.985m
Therefore, the real depth of the water at this point is 5.985m
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How did John philoponus changed the science of forces
Answer:
philoponus originated one of physics great paradigm shifts. he said that after a projectile is launched, it keeps moving because of a force impressed into it by the thrower
