A concave mirror having a focal length of magnitude 5.0 cm forms an image 4.0 cm behind the mirror. Thing that is present in front of the mirror is the object for this image.
A mirror with a curved reflecting surface is referred to as a curved mirror. The surface could be concave mirror or convex (bulging outward) (recessed inward). Although optical systems occasionally employ alternative shapes, most curved mirrors have surfaces that are formed like a portion of a spherical. Since spherical mirror systems, like spherical lenses, are subject to spherical aberration, the most prevalent non-spherical variant is found in optical instruments such as reflecting telescopes that must picture distant objects. Mirrors that distort images are used for amusement. Concave and convex sections on them provide purposefully distorted images. When the object is positioned at specific distances, they also offer images that are either magnified or greatly diminished (smaller). A curved mirror with a reflective surface that bulges in the direction of the light source is referred to as a convex mirror or diverging mirror. Convex mirrors do not focus light since they reflect it outward. Since the focal point (F) and the center of curvature (2F) are both fictitious positions "within" the mirror that cannot be reached, such mirrors always produce a virtual image.
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Which of the following best describes an electromagnet?
Need a Hint?
A) permanent magnet
B) insensitive to electrical currents
C) unchanging magnetic properties
D) temporary magnet
An Electromagnet can be best described as a temporary magnet.
An Electromagnet is called a non permanent magnet or a temporary magnet.
It is called so because of its property of getting magnetized and demagnetized.
Electromagnet behaves like a magnet only in the presence of the electric current their magnetic properties disappear as soon as the current in them stops.
Electromagnet are used in various devices like headphones and loudspeakers, induction cookers, data storage devices MRI machines and magnetic locks.
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what do you call a spring that escapes a confined aquifer via rock fracture and is under enough pressure to free-flow to the surface?
Artesian spring all a spring that escapes a confined aquifer via rock fracture and is under enough pressure to free-flow to the surface.
To keep the water from evaporating, aquitards must exist both above and below the aquifer. when a well is dug into the aquifer and the pressure surface is above the surface.
A pumpless water source known as an artesian well utilizes pipes to help pressurized subsurface water rise to the surface.
movement of saline water into freshwater aquifers in inland and coastal regions as groundwater is drained more quickly than it is replenished by precipitation
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which has greater linear speed, a horse near the outside rail of a merry-go-round or a horse near the inside rail?
In the same period of time, the horses on the outside of the carousel must travel farther than the ones on the inside. Accordingly, the horses outside move at a faster linear speed than the horses at the hub.
On a merry-go-round, is the angular speed the same?Every point on the surface of the merry-go-round revolves at exactly the same angular speed because it rotates as a single solid entity.
whose tangential speed is higher A horse near the outside rail or one towards the middle of the merry-go-round?Which horse travels faster along a rail, one near the inside or one on the outside of a merry-go-round? neither because their linear speeds are equal.
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a domestic microwave oven, like you might use in your dorm room, operates at 2.45 ghz. what is the wavelength of this radiation in cm?
the wavelength of this electromagnetic radiation is 12.2cm.
Calculation :
The frequency, speed of light, and wavelength are interrelated with each other as:
fλ=c
f is 2.45GHz or 2.45∗10⁹Hz
λ=3∗10⁸/2.45∗10⁹
So, the wavelength of this electromagnetic radiation is 12.2cm.
Wavelength is the distance between identical points (adjacent peaks) in adjacent cycles of a waveform signal propagating in space or along a line. For wireless systems, this length is usually specified in meters (m), centimeters (cm), or millimeters (mm).
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A(n) 71.1 kg astronaut becomes separated
from the shuttle, while on a space walk. She
finds herself 58.5 m away from the shuttle
and moving with zero speed relative to the
shuttle. She has a(n) 0.681 kg camera in her
hand and decides to get back to the shuttle
by throwing the camera at a speed of 12 m/s
in the direction away from the shuttle.
How long will it take for her to reach the
shuttle? Answer in minutes.
Answer:
10.347
Explanation:
describe how you could use a ray diagram to determine the location of the image of an extended object. such as a pencil.
A ray diagram is a tool used by physicists to explain or predict the behavior of beams of light as they pass through objects such as glass blocks or lenses.
A ray diagram is a diagram that strains the route that light takes so as for a person to view a factor in the photograph of an object. In the diagram, rays are drawn for the incident ray and the meditated ray.
Ray diagrams help us hint at the course of the light for the man or woman to view a point on the photograph of an object. The Ray diagram makes use of lines with arrows to symbolize the incident and reflected ray. It also helps us trace the direction in which the mild travels.
A mild ray is a line that is perpendicular to the mild's wavefronts; its tangent is collinear with the wave vector. light rays in homogeneous media are instant. They bend at the interface between two distinctive media and may be curved in a medium wherein the refractive index modifications.
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xif 54 j of work is needed to stretch a spring from 10 cm to 16 cm and another 90 j is needed to stretch it from 16 cm to 22 cm, what is the natural length (in cm) of the spring? cm
the natural length (in cm) of the spring is 4 cm
Calculation :
Let a = natural length of string from given data
54 = k/2(16-a)² - k/2(10-a)²
108 = k[256 + a² - 32a - 100 - a² + 200]
108 = k[156 - 12a]
9 = k[39 - 3a] ------ 1
90 = k/2(22-a)² - k/2(16-a)²
90 = k(114 - 6a)
15 = k(19 - a) --------2
solving eqn 1 and 2
15/9 = (19k - ka)/(13k - ka)
15/9 = (19- a) / (13 - a)
24 = 6a
a = 4 cm
the natural length (in cm) of the spring is 4 cm.
Work is a force over distance. Examples of jobs include lifting objects against gravity, driving cars up hills, and pulling down trapped helium balloons. Work is a mechanical manifestation of energy. The usual unit of work is the joule (J), which is equivalent to the Newton meter (N m).
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if a person weighs 600 n and the surface area of the bottom of both feet combined is 200 cm2, what is the pressure
The pressure exerted by the person is found to be 3 N/cm².
The physical force applied to an object is referred to as pressure. It is the force that is dispersed over a unit area per unit of time perpendicular to the surface of an object. The formula used to calculate pressure is P=F/A where P is the pressure, F is force, and A is the area.
Given the force is 600 N and the area is 200 cm².
Then, the pressure is calculated as follows,
P = F/A
P = 600 N/200 cm²
P = 3 N/cm²
The answer is 3 N/cm².
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the force of gravity of one body exerts different strengths on opposite sides of another body. this differential gravitational force is called the
The differential gravitational force that one body exerts on opposite sides of another body is called gravitational torque.
Gravitational torque is a measure of the rotational force exerted by a gravitational field on an object. It is equal to the product of the gravitational force and the lever arm (the distance between the point of application of the force and the axis of rotation).
For example, consider a satellite orbiting a planet. The satellite experiences a gravitational force from the planet, which acts to pull it toward the planet. However, this gravitational force is not uniform over the surface of the satellite.
The side of the satellite closest to the planet experiences a stronger gravitational force than the side furthest from the planet. This differential gravitational force creates a gravitational torque on the satellite, which causes it to rotate about its axis.
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does the evidence you collected support or refute the claim objects with a larger mass will sink in water
If an object weighs more than an equal volume of water, it is more dense and will sink, and if it weighs less than an equal volume of water, it is less dense and will float.
Heavy objects sink and light objects go with the flow irrespective of their size, form or the type of cloth used to lead them to. A true floating item ought to be wholly above the floor of the liquid.
All objects, even those that drift, displace some water. Mainly, while located in water, an item sinks into the water until it displaces an quantity of water same to its very own mass. The extra mass an item has, the in addition it sinks.
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Starting from rest, you run to a speed of 6.5 m/s in a time of 1.2 seconds. Determine your acceleration
- .37 m/s^2
- 2.7 m/s^2
- 3.8 m/s^2
- 5.4 m/s^2
Answer: a = 5.4 m/s^2
Explanation:
a = Δv/Δt
a = (6.5 m/s)/(1.2 s)
a = 5.4 m/s^2
q2. is it possible for the particle undergoing tunneling to be found within the barrier, rather than on either side of it?
Yes, it is possible for a particle to be found within the barrier while undergoing tunneling.
This phenomenon is known as quantum tunneling. Quantum tunneling occurs when a particle tunnels through a barrier that is normally too high to be crossed by the particle's kinetic energy. This occurs due to the wave-like nature of particles, which allows them to go through barriers that are otherwise impenetrable.
The wave-like nature of particles allows them to penetrate the barrier, often with a probability greater than zero. This phenomenon is used in many applications in science and technology, such as in quantum computing, where quantum tunneling is used to tunnel qubits through the barrier of a logic gate.
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a boat floating in fresh water displaces a volume of water with a weight of 16,000n. if it floats in saltwater with density 1.17 times that of water, then the weight of saltwater displaced (in newtons) is:
Archimedes, on the other hand, states that the amount of water (equal to 16000N) will be reduced by 3% since seawater has a specific gravity that is roughly 3% higher than freshwater.
How much water does a boat move when it is in the water?900 000 metric tonnes of water are removed by it. 300,000 elephants would be the equal. The air inside a ship is significantly less dense than water. It floats because of that. The key concept is that the body "floats," which is the underlying presumption in this situation. According to the Archimedes Principle, for this body, vessel, or whatever it may be to float, it must move an equal amount of water.
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it is ok to evaporate all the liquid so that the conical vial is completely dry.
When the bubbling stops, what appears to be liquid is actually molten solid, which won't evaporate but could breakdown under extreme heat.
What liquid matter means?Particle are less closely packed in liquids than they are in solids. When maintained inside a container, liquids adopt that shape. Since there is a smaller room for movement among particles in liquid, compression is challenging. While liquids have a fixed volume, their shapes are not.
Why is water a liquid?The significant difference in polarity between oxygen and hydrogen causes the water molecules to be dipolar. As a result, a tight hydrogen bond forms between the H & O of nearby water molecules, which explains why the water molecules are packed closely together.
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FILL IN THE BLANK. the energy of a photon that has a frequency of 1.821 × 1016 s-1 is ________ j.
The energy of the photon is 1.21 *[tex]10^{-17} J[/tex]
Photons released during transition have an energy of
E = hv
E=(hc) / λ
where ,
h Planck's constant, which is equal to 6.626 x[tex]10^{-34}[/tex] J-s
v is frequency of photon
λ is wavelength of photon
Einstein's paradigm was built on the basis of two suppositions. He initially believed that light was made up of photons, which are tiny, discrete bundles of energy. Second, he predicated that the energy of a photon is inversely related to both its wavelength and its frequency.
substituting the values in above formula we get
E=( 6.626 x[tex]10^{-34}[/tex] J-s) *(1.821 × [tex]10^{16}[/tex] [tex]s^{-1}[/tex])
E= 1.21 *[tex]10^{-17} J[/tex]
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a heat engine uses a monatomic gas in a brayton cycle. part a what is the engine's thermal efficiency if the gas volume is halved during the adiabatic compression?
The engine's thermal efficiency if the gas volume is halved during the adiabatic compression is 24%
Any thermal cycle's efficiency is expressed as
[tex]$$\eta=1-\frac{T_c}{T_h}$$[/tex]
We know that for an adiabatic process
[tex]$$p V^\gamma=\text { const }$$[/tex]
From the first law, we may express pressure in terms of temperature.
[tex]$$\begin{aligned}& p V=n R T \\& \Rightarrow p=\frac{n R T}{V} \propto T V^{-1}\end{aligned}$$[/tex]
As a result, we have the following for an adiabatic process:
[tex]$$T V^{\gamma-1}=\text { const } .$$[/tex]
Let us now calculate a temperature ratio based on the volume ratio:
[tex]$$T_c V_c^{V-1}=T_h V_h^{\gamma-1}$$[/tex]
We get that
[tex]\frac{T_c}{T_h}=\frac{V_h^{\gamma-1}}{V_c^{\gamma-1}}=\left(\frac{V_h}{V_c}\right)^{\gamma-1}$$[/tex]
The Efficiency will be,
[tex]$$\begin{array}{r}\eta=1-\left(\frac{V_h}{V_c}\right)^{\gamma-1} \\\eta=1-\left(\frac{1}{2}\right)^{1.40-1}=24 \% .\end{array}$$[/tex]
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The 20-kg crate is lifted by a force of F = ( 100 +{ 5t }^{ 2 }) NF=(100+5t 2)N, where t is in seconds. Determine how high the crate has moved upward when t = 3 s, starting from rest.
4.23 m is the height the crate can move in 3s.
At t = 0,
force F = 100 N.
the time taken to move upward is 3s
Since at this moment,
2 F = 200 N > W = 20(9.81) = 196.2 N2F=200N>W=20(9.81)=196.2N,
the crate will move at that moment force F is applied. Referring to the Free body diagram of the crate,
[tex]m(v_y)_1 + \sum\int\limits^{t_2}_{t_1} {F_y} \, dt=m(v_y)_2[/tex]
=> [tex]0+2\int\limits^t_0 {100+5t^2} \, dt-20(9.81)t=20v[/tex]
=>[tex]2(100t+\frac{5}{3} t^3)-196.2t =20v[/tex]
=> v={0.1667[tex]t^3[/tex] + 0.19 t} m/s
The displacement of the crate can be calculated by integrating
ds = v dt with the primary condition s = 0 at t = 0.
[tex]\int\limits^s_o \, ds =\int\limits^t_o {0.1667t^3+0.19t} \, dt[/tex]
=> s={0.04167[tex]t^4[/tex]+0.095[tex]t^3[/tex]}m
At time t = 3 s,
s=0.04167 ( [tex]3^4[/tex] ) + 0.095 ( [tex]3^3[/tex])
=> s = 4.23 m
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compared to the velocity of a 400 hz sound, the velocity of a 200 hz sound through air is
A sound traveling through air at 200 Hz has the same velocity as one traveling at 400 Hz.
The source determines the frequency of the sound wave. However, the density of the medium and the bulk modulus are the only factors that affect the speed of the sound wave. When compared to the speed of sound at 400 Hz, the speed of sound at 200 Hz is therefore constant.
Air and water have different sound propagation rates. The speed of sound in air is around 343 meters per second under normal circumstances, while the speed of sound in water is approximately 1,480 meters per second. Fundamentally, a compression wave moving through a medium is what makes up normal sound.
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Correct Question:
Compared to the velocity of a 400 Hz sound, the velocity of a 200 Hz sound through air is __________.
a small object of mass m on the end of a light cord. what is the tension in the cord when the object is at the lowest point of its swing
The tension in the cord when the object is at the lowest point of its swing is 3 mg.
The complete question is in the attachment. The small object moves from point A to point B. According to the law of conservation of energy
KE a + PE a = KE b + PE b
0.5 m₁ v₁² + m₁ g h₁ + 0.5 m₂ v₂² + m g h₂
At point A(0.5 × m × 0²) + (m × g × r) = (0.5 × m × v₂²) + (m × g × 0)
0 + mgr = 0.5 mv₂² + 0
v₂² = 2gr
[tex]v_2 \:=\: \sqrt{2gr}[/tex]
The object moves according to uniform circular motion. There is the centripetal force that works in the system. The forces acting on the object are weight force and tension force. According to Newton's second law for circular motion
Fc = mα
T - w = mv²/R
T - mg = mv²/R
m = the mass v = the velocity at the lowest point = v₂R = the radius = rg = the acceleration due to gravityT = mv₂²/r + mg
T = (m × 2gr ÷ r) + mg
T = 2mg + mg
T = 3 mg
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a racecar traveling at a constant speed of 50 m/s drives around a circular track that is 500 m in diameter. what is the magnitude of the radial acceleration of the car?
The magnitude of the radial acceleration of the car 10m/sec²
Given Velocity v = 50m/sec
Diameter D = 500m
Radius r = 250m
Acceleration a = [tex]v^{2}[/tex]/r = 2500/250 = 10m/sec²
The rate of change in an object's velocity with respect to time is known as acceleration in mechanics. In vector quantities, accelerations exist (in that they have magnitude and direction). [1] [2] The direction of the net force that is acting on an object determines its acceleration. Newton's Second Law[3] states that the sum of the effects of two causes determines the size of an object's acceleration:
The net balance of all external forces acting on that thing — magnitude is directly proportional to this net resulting force; that object's mass, depending on the materials out of which it is built — magnitude is inversely proportional to the object's mass.
Meter per Second Squared (m/s2) is the SI unit for acceleration. displaystyle, mathrm, tfrac, ms2, and
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a point-to-point microwave link is being implemented at 10 ghz using identical parabolic antennas on each end of 20 cm diameter and illumination efficiency of 90%. find the gain of these antennas. g
A point-to-point microwave link is being implemented at 10 ghz using identical parabolic antennas on each end of 20 cm diameter and illumination efficiency of 90%. 10 g X G means 10gG is the gain of these antennas.
Electromagnetic radiation that can be seen by the human eye is known as light or visible light. Typically, visible light is characterized as having wavelengths between 400 and 700 nanometers (nm), or frequencies between 750 and 420 terahertz, which fall between the longer-wavelength infrared and the shorter-wavelength ultraviolet (with shorter wavelengths). The term "light" in physics can be used to more broadly describe electromagnetic radiation of any wavelength, whether or not it is visible. Gamma rays, X-rays, microwaves, and radio waves are all forms of light in this sense. Intensity, illumination, propagation direction, frequency or wavelength spectrum, and polarization are the four main characteristics of light. One of the fundamental constants of nature is its speed in a vacuum, which is 299 792 458 meters per second (m/s). The wavelength of EMR affects how it behaves. While lower frequencies have longer wavelengths, higher frequencies have shorter ones. The behavior of EMR depends on the energy that each quantum of the field carries when it interacts with individual atoms and molecules.
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Find the kinetic energy of arotating body with moment of inertia 0.003 kgm^2 and angula velocity of 0.6 radius
The kinetic energy of a rotating body with moment of inertia 0.003 kgm^2 and angular velocity of 0.6 radius per seconds is equal to 0.00054 Joules.
What is kinetic energy?In Science, kinetic energy can be defined as a type of energy that's possessed by a physical object or body, especially due to its motion or a change in velocity (acceleration).
How to calculate the kinetic energy of a rotating body?Mathematically, the kinetic energy of a rotating body with a given moment of inertia and angular velocity can be calculated by using the following mathematical expression;
K.E = 1/2 × I × ω²
Where:
K.E represents the kinetic energy of a rotating body.I represents the moment of inertia.ω represents the angular velocity measured in rad/s or rads⁻¹.Substituting the given parameters into the formula for the kinetic energy of a rotating body, we have;
K.E = 1/2 × 0.003 × 0.6²
K.E = 0.00054 Joules.
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Complete Question:
Find the kinetic energy of a rotating body with moment of inertia 0.003 kgm^2 and angular velocity of 0.6 radius per seconds.
a 1.5 kg block is sliding on a frictionless surface with a speed of 12 m/s when it crashes into a horizontal spring. the spring has a spring contstant of 2100 n/m. how far will the spring be compressed wehn the box's speed has been reduced to exactly half its speed?
The spring's compressed length before halting frictionless is therefore 0.40m.
(m2) (s–1) (s–1)
2 N kg m s2 (kg m-1) Take a test. 5. Scalars: mass, distance, and the labour required to extend the spring out of its equilibrium position are stored as elastic potential energy; vectors: displacement, velocity, acceleration, and force; The work required to extend the spring away from equilibrium is equal to the change in kinetic energy of the box. The spring is extended until the box stops moving; hence, the box's final kinetic energy is zero. The elastic potential energy used to compress the spring can be equated to the initial kinetic energy of the box to find the expression to compute the compressed distance using the law of conservation of energy frictionless.
The force required to create
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which one of the following statements best explains why gases are not commercially sold by volume?
a. Gas volume is neligible
b. Gas volume is difficult to measure
c. Gas volume depends on the type of gas
d. Gases have comparitviely low densities
e. Gas volume depends on temperature and pressure
Due to the dependence of gas volume on temperature and pressure, gases are not commercially marketed by volume.
The space occupied by the gaseous particles under typical pressure and temperature circumstances is referred to as the volume of gas.
It has the symbol "V."
The symbol for volume in the SI is "litres," or "L".
When the gas is at normal temperature, a mole has a volume of 24 m3, or 24 000 cm3.
The molar volume of a gas is this quantity.
The body of lecture 18 is included in the material that follows. The Gas Laws, including the Ideal and Combined Gas Laws, as well as Charles', Boyle's, Avagadro's, and Gay Lussacs', are covered in this lecture.
The four primary characteristics of gases are related to one another by four main principles.
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an outdoor thermometer ~sterl1l temperature of 40 f. five minutes after it is brought into a room where the temperature is 70 f. the thermometer registers 60 of. when will it register 65 ' f')
An outdoor thermometer ~sterl1l temperature of 40 f. five minutes after it is brought into a room where the temperature is 70 f. the thermometer registers 60 of. In 8.15 min it will register 65 f.
The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature. Thermometers are calibrated using a variety of temperature scales, which historically defined distinct reference points and thermometric substances. The most popular scales are the Celsius scale, sometimes known as centigrade, with the unit symbol °C, the Fahrenheit scale (°F), and the Kelvin scale (K), with the latter being mostly used for scientific purposes. One of the seven base units in the International System of Units is the kelvin (SI). The lowest temperature on the thermodynamic temperature scale is absolute zero, or 0 kelvin, or 273.15 °C. The third law of thermodynamics acknowledges that it cannot actually be reached experimentally but can only be very closely approached. At that temperature, it would be difficult to produce heat from a body. All areas of natural science, including physics, chemistry, Earth science, astronomy, biology, ecology, material science, metallurgy, mechanical engineering, geography, and most aspects of daily life, depend on temperature. These fields include medicine, biology, ecology, and most other branches of science.
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5. a capacitor is connected into a 1250-v, 1000-hz circuit. the current flow is 80 a. what is the capacitance of the capacitor?
QCS=QC1+QC2+QC3. When we cancel the charge Q, we get the formula 1CS=1C1+1C2+1C3, which contains the equivalent capacitance, CS, of three capacitors connected in series.
Any number of capacitors in a series network can be included in the generalization of this formula. The polarity of an AC current alternates between positive and negative on a regular basis. As the polarity of the current changes, capacitors are continuously charged and discharged, allowing AC current to pass through. A capacitor, as contrast to a battery, is a component of a circuit that temporarily stores electrical energy by dispersing charged particles between (often two) plates to produce a potential difference. A capacitor may charge more fast than a battery and can discharge its whole stored energy in a matter of seconds.
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what is the minimum amount of hydrogen gas, in grams, required to completely hydrogenate 18.0 kg of 2-butene?
The minimum mass of hydrogen gas required is 641.64 grams.
Hydrogenation is a chemical reaction between molecular hydrogen and another compound or element, usually in the presence of a catalyst such as nickel, palladium, or platinum. This process is commonly used to reduce or saturate organic compounds.
2-butene = C4H8
maximum hydrogenation = C4H10
then we require 2 H, that is 1 mol ofH2
2-butene +H2 --> butane
MW of butene = 56.106
mol of butene = mass/MW = 18000/56.106 = 320.8213mol
then we require 1:1 ratio
320.8213 mol of H2
mass = mol*MW = 320.8213*2 = 641.64 g of H2
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when the first astronauts travel to mars they will be traveling for long periods of time with no external time cues. you would predict that the circadian rhythms for these astronauts would
Based on the provided information, it can be predicted that the circadian rhythms for the astronauts would be drift toward a slightly longer cycle. (Option A)
A circadian rhythm, also known as circadian cycle, refers to a natural, internal process that regulates the sleep–wake cycle and is repeated roughly every 24 hours. It can refer to any process that originates within an organism and responds to the environment. These natural processes respond primarily to light and dark and affect most living things. A zeitgeber refers to any external cue or environmental cue that synchronizes an organism's biological rhythms such as circadian rhythm, usually naturally occurring and serving to entrain to the Earth's 24-hour light/dark and 12-month cycles. Circadian rhythms that are expressed in the absence of any 24-hour signals from the external environment are called free running, which are slightly longer cycle than usual. Hence, in the absence of external cue, the circadian rhythms for the astronauts would drift toward a slightly longer cycle.
Note: The question is incomplete as it is missing options which are a. They would drift toward a slightly longer cycle. b. They would become sporadic and show no definite pattern. c. They would stay synchronized with a 24-hour cycle. d. They would become synchronized with the light pattern around Mars.
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what is the angle between the beam that is reflected at the water surface and the beam that is transmitted into the water?
The critical angle for water is 49 degrees, calculated as the angle between the beam and a line perpendicular to the surface.
What alternative word would you use for reflecting?Cogitate, deliberate, reason, conjecture, and think are a few words that frequently replace the word reflect. All of these terms indicate "to utilize one's faculties of imagination, reasoning, or inference," but reflect denotes thoughtful deliberation over a memory that has just come to mind.
What response is reflected?When light reflects off of something, it does so. The light will reflect at the same angle it struck the surface if the surface is smooth and shining, such as glass, water, or polished metal. Specular reflection is the name for this. A smooth surface allows light to bounce back at the same angle that it was incident.
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The escape velocity from planet A is double that forplanet B. The two planets have the same mass. What is theratio of their radiation, rA/rB?
The ratio of their radius [tex]\frac{r_A}{r_B}[/tex] = 1/4 .
What is escape velocity?Escape velocity is the speed at which the sum of kinetic and gravitational potential energy of an object equals 0.
[tex]v_e_s_c[/tex] = [tex]\sqrt{\frac{2GM}{r} }[/tex]
where [tex]v_e_s_c[/tex] is escape velocity G is universal gravitational constant and M is mass of the object and r is distance of object.
let [tex]v_A[/tex] and [tex]v_B[/tex] be the escape velocity of the of planet A and planet B
so [tex]v_A = \sqrt{\frac{2GM}{r_A} }[/tex] -----(i)
and [tex]v_B=\sqrt{\frac{2GM}{r_B} }[/tex] ----(ii)
given [tex]\frac{v_A}{v_B}[/tex] = 2
=> [tex]\frac{v_A^2}{v_B^2}[/tex] = 4
=> [tex]\frac{r_B}{r_A}[/tex] = 4
so [tex]\frac{r_A}{r_B}[/tex] = 1/4
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