A refrigerator that accepts heat from a low-temperature reservoir also rejects heat to the same reservoir.
What is a refrigerator?A refrigerator is an open system that moves heat from a closed space to a warmer location, typically the kitchen or another room. By removing the heat from this area, the temperature drops, allowing food and other items to remain cool.The primary purpose of a refrigerator is to keep food cold. Cold temperatures keep food fresher for longer. The basic idea behind refrigeration is to slow down the activity of bacteria (which is present in all food) so that the bacteria take longer to spoil the food.The main principles of the refrigeration process, or cycle, are the absorption of the amount of heat required for the change of state from a liquid to a vapor by evaporation and the release of that amount of heat required for the change of state from a vapor back to the liquid by condensation.To learn more about refrigerator refer to :
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Surprisingly, very few athletes can jump more than 2 feet (0.6m)straight up. Use d= 1/2 gt squared and solve for the time onespends moving upward in a 0.6 m vertical jump. Then double it forthe Hand time the time ones feet are off the ground?
0.7 sec is total time in air .
What is acceleration due to gravity ?
Gravitational acceleration is the acceleration experienced by an object due to gravity. Its SI unit is m/s2. It is vector magnitude because it has both magnitude and direction. The standard value of g on the surface of the earth at 0m above sea level is 9.8m/s2. Suppose an object [test mass (m)] is moved from a height "h" above the ground [source mass (M)], and as it approaches the ground it begins to move downwards, increasing its velocity. We know that the velocity of an object changes only under the action of a force. In this case the force is provided by gravity.
Under the action of gravity, the object begins to accelerate towards the center of the earth. The center of the Earth is at a distance "r" from the test mass. Then ma = GMm/r2 (applies the equivalence principle)
⇒ a = GM/r2 . . . . . . (1)
The above acceleration is due to the earth's gravitational pull, so we call it the gravitational acceleration and it does not depend on the test mass. The value near the ground is 9.8 ms-2. Therefore the acceleration due to gravity (g) is given by = GM/r2.
0.6m is the distance traveled vertically upwards
and as the acceleration is uniform we have 0.6=0.5*9.8*t*t
hence we have t, the time spent moving upwards is
0.35sec
the double of it 0.7 sec is total time in air
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a block of mass 0.4kg on a horizontal surface is attached to a horizontal spring of negligible mass. the other end of the spring is attached to a wall, and there is negligible friction between the block and the horizontal surface. the block-spring system then experiences simple harmonic motion as described by the graph. the maximum spring potential energy of the block-spring system is most nearly
Simple harmonic motion a loaded spring undergoes simple harmonic motion whose period is proportional to the mass and inversely proportional to the spring constant.
What is simple harmonic motion?Simple harmonic motion is the periodic motion of an object along a straight line, such that the acceleration of the object is directed towards a fixed point on that line and is proportional to its distance from that point.
Example of a simple harmonic motion is the motion of a loaded spiral spring.
The restoring force on the spring is directly proportional to the extension of the spring and the spring constant.
The period of motion, T when a mass, m is attached to a spring with spring constant k,is given as:
T = 2π√(m/k)
Therefore, a loaded spring undergoes simple harmonic motion whose period is proportional to the mass and inversely proportional to the spring constant.
What is periodic motion ?Periodic motion, in physics, motion repeated in equal intervals of time. Periodic motion is performed, for example, by a rocking chair, a bouncing ball, a vibrating tuning fork, a swing in motion, the Earth in its orbit around the Sun, and a water wave
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A 20.0 N force is exerted on the small piston of a hydraulic system. The cross-sectional
area of the small piston is 0.0500 m². What is the magnitude of the weight than can be
lifted by the large piston, which has a cross-sectional area of 0.100 m²?
A 20.0 N force is exerted on the small piston of a hydraulic system. The cross-sectional area of the small piston is 0.0500 m2.
What is meant by Hydraulic ?
A mechanical process known as hydraulics uses the force of liquid pressure to operate. In hydraulics-based systems, confined, pumped liquid moves pistons, often through hydraulic cylinders, to create mechanical movement.Operating, utilising, or causing to flow water or other liquids. water or other liquids in motion; operated by the pressure produced by driving water, oil, or another liquid through a relatively small pipe or opening.For instance, hydraulic systems are used by modern aeroplanes to power their controls, deploy their landing gear, and apply their brakes. Fluid power is used by almost all missiles and the ground-support machinery that goes with them. In automobile transmissions, brakes, and steering mechanisms, hydraulic power systems are employed.To learn more about Hydraulic refer to
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if john mows 11.5 meters of lawn from est to west in 7.1 seconds, what is the velocity of the laawnmower?
Answer:
11.5m/7.1s=1,619718309859155m/s
Explanation:
Distance devided per time. For km/h multiply it with 3.6
a 0.2 kg sample of water at 60.0°c is heated to water vapor at 140.0°c. how much heat was absorbed? the specific heat value of water is 4180 j/kgoc. the specific heat value of water vapor is 2020 j/kgoc. the latent heat of vaporization of water is 2.26 x 106 j/kg.
Heat absorbed = 1.05 x 105 J.
Heat absorbed = (mass x specific heat x change in temperature) + (mass x latent heat of vaporization)
Heat absorbed = (0.2 kg x 4180 J/kg°C x (140.0°C - 60.0°C)) + (0.2 kg x 2.26 x 106 J/kg)
Heat absorbed = 59.7 x 104 J + 45.2 x 104 J
Heat absorbed = 1.05 x 105 J
What is vaporization?
Vaporization is the process of a liquid or solid changing into a vapor or gas. It occurs when enough energy is supplied to the molecule to overcome the attractive forces, allowing them to break away from the liquid or solid and form a gas. Vaporization can occur due to heating, pressure, or chemical reactions and can be used in many applications such as distillation and sterilization.
Therefore, Heat absorbed = 1.05 x 105 J.
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If a jet plane doubles the speed, the drag force on the jet plane A. decreases by B. depends how many passengers the plane is carrying C. doubled D. quadrupled E. is unchanged
If a jet plane doubles the speed, the drag force on the jet plane, doubled. Option (c) is correct.
What is speed ?
A shift in an object's location, either in direction or speed. How fast something is travelling is determined by how far it has travelled in relation to how long it took. Speed is considered a scalar quantity because it only has a direction and no magnitude.
What is force ?
When an object interacts with another object, it experiences a push or pull known as a force. Every time two objects come into contact, a force is applied to each one of them. Actual forces can only be created by interaction.
Drag force on the plane is proportional to the square of the planes speed
F₁ ∝ v²
Ff ∝ (2V)²
From the above two equations, it is clear that the ratio of the drag forces will be
Ff/ F₁ = 4V²/ V²
Ff = 4F₁
Hence the drag force will be the four times of the initial drag force when the speed of the plane doubles.
Therefore, If a jet plane doubles the speed, the drag force on the jet plane, doubled. Option (c) is correct.
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Find the critical value for a left-tailed test with α = 0.05 and n = 48. A. -1.96 B. -2.33 C. -2.575 D. -1.645
Option D is correct choice. Critical value for a left-tailed test with α = 0.05 and n = 48 is -1.645
Note: Considering a z test here as the sample size n is greater than 30.
The values that show the boundary of the critical region are referred to as critical values.
Critical areas, sometimes referred to as rejection regions, are the whole range of values that show you reject the null hypothesis.
The critical zone, or area of the "tails" of the distribution, is the area that is covered by values that do not support the default assumption.
Z-scores for typical confidence intervals and alpha values are different.
Using a left-tailed test and an alpha of 0.05, 95% of the area under the curve would be outside the critical area.
The Z-score for 0.95 is roughly -1.65 (-1.645)
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an object is moving at 18 m/s at an angle of 220 ∘ counterclockwise from the x axis.
The components of the velocity vector of counterclockwise are:
vx = -12.6 m/s
vy = -16.3 m/s
What is counterclockwise?
Counterclockwise is the direction opposite to that of the rotation of a clock's hands. It is the opposite of clockwise, which is the direction of the rotation of a clock's hands. Counterclockwise movement or rotation is often abbreviated as CCW. In mathematics, counterclockwise is referred to as the positive rotational direction. In engineering, the direction of rotation of a motor or other device is usually indicated by the letters CW for clockwise and CCW for counterclockwise. It is also commonly referred to as the anti-clockwise direction. Counterclockwise motion is often used in mechanical systems to prevent the buildup of friction and wear on components. Additionally, this motion may be used to reduce the chance of clogs or jams in machines with moving components.
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Above figure shows a light extended spring exerting a force Fs to the left on a block.
(i) Does the block exert a force on the spring? Choose every correct answer.
(a) No, it doesnt.
(b) Yes, it does, to the left.
(c) Yes, it does, to the right.
(d) Yes, it does, and its magnitude is larger than F s.
(e) Yes, it does, and its magnitude is equal to Fs
.
Option - C and E : The force of block on spring is equal in magnitude and opposite to the force of spring on block.
In straightforward situations, a light force is defined as radiation pressure that exerts a force in the direction of the absorbed light's propagation. However, the direction of the effective force might also differ from the direction of the propagation. In addition to energy, photons can carry momentum. Consequently, if a particle absorbs light or modifies its path, momentum is transmitted (i.e., a force is applied). The tails of comets, which always appear on the side facing the Sun and are made up of dust particles driven away by the light, are one example of the effects caused by such light forces.
The rules of electromagnetism demonstrate that whenever electric charge sources like electrons are accelerated, the resulting energy is transformed into waves.
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A parallel laser beam of width w1 is incident on a two lens system as shown below. Each lens is converging. The second lens has a larger focal length than the first (f2>f1). 1) What does the beam look like when it emerges from the second lens? O The beam is converging O The beam is diverging O The beam is parallel to the axis with a width < W1 O The beam is parallel to the axis with a width = w1 O The beam is parallel to the axis with a width > W1
When it emerges from the second lens, the beam seems to be parallel to the axis and wider than W1. A two lens system is incident on by a parallel laser beam of width w1, as shown below.
Every lens is focusing together. Pole The pole of a lens is the centre of its spherical refracting surface. the location where the lens's surface and primary axis converge. Vision Center The term "Optical Center" refers to the location on the primary axis that is in the middle of the lens. The transmissive optical device known as a lens employs refraction to focus or disperse a light beam. The only component of a basic lens is a single transparent piece (elements).
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For an RC circuit, find an expression for the angular frequency at which VC=1/2E0.
Express your answer in terms of the variables R, C, and E0.
The angular frequency at which VC=1/2E0 of an RC circuit is √3/RC where R is the resistance and C is the capacitance of the circuit.
Let the voltage across a resistor = Vr
Given The voltage across a capacitor = Vc = 1/2E0
The angular frequency = ω = 2πf
The current in the circuit = I
The permittivity of free space = E0
The resistance of resistor = R
Vc = ω/x = E0/2 then E0 = 2ω/x
We know that E0 = √Vc^2 + Vr^2 such that E0^2 = E0^2/4+Vr^2
Then Vr^2 = 3E0^2/4 such that Vr = √3E0/2
The capacitance (C) can be calculated as: C = Vr/Vc x 1/ωR
ω = (Vr/Vc) x 1/RC = (√3E0/2)/E0/2 x 1/RC
So ω = √3/RC
Hence the angular frequency of an RC circuit is √3/RC
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Two cylindrical wires are made of the same material and have the same length. If wire B is to have nine times the resistance of wire A. What must be the ratio of their radii, rB/rA ?
The ratio of the radii rB/rA is 1/3
What does the word "resistance" mean?
The obstruction to current flow in an electrical circuit is measured by resistance. The Greek letter omega (Ω) represents the unit of measurement for resistance, known as ohms.
The collisions between the wire's atoms and electrons result in resistance. The length has a direct relationship to the resistance. The cross-sectional area of the wire is, however, inversely proportional to the square of the wire's radius. This indicates that the relationship between the wire's resistance and radius is inverse. As a result, the wire's resistance drops as the radius rises.
Resistance = (density *length) /area
The density and length of the material is same in both the cases
Area = πr2
So, R1/R2 is (r2/r1)^2
r2/r1 will be square root of R1/R2
R2 is 9 times R1
So, r2/r1 will be 1/3
i.e. rB/rA is 1/3 .
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the gas in a hot air balloon is heated, and in the process the volume of the gas increases as the balloon expands against a constant pressure of 1 atm. because the hot gas in the balloon is less dense than the surrounding cold air, it provides buoyancy. which of the following statements about this process are correct?
Charles' law by the gas in a hot air balloon is heated, and in the process, the volume of the gas increases as the balloon expands against a constant pressure of 1 atm. because the hot gas in the balloon is less dense than the surrounding cold air, it provides buoyancy.
Stress is the force applied perpendicular to the surface of an object in keeping with the unit location over which that force is shipped. Gauge strain is the strain relative to the ambient strain. Numerous gadgets are used for the specific strain. strain is defined to be the quantity of pressure exerted per location.
The pascal (Pa) is the same old unit of stress. A pascal is a very small quantity of stress, so the most beneficial unit for normal gasoline pressures is the kilopascal (kPa). A kilopascal is equal to a thousand pascals. Another usually used unit of pressure is the atmosphere (atm).strain is commonly measured in units of pressure in step with a unit of surface vicinity ( P = F / A). In bodily technological know-how, the image for strain is p and the SI unit for measuring stress is the pascal (image: Pa). One pascal is the pressure of one Newton consistent with a square meter appearing perpendicular on a floor.
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When a hot air balloon is involved, the fuel is ignited, raising the temperature of the air inside the balloon. The gas then expands in volume as a result.
Charles's law is followed by hot air balloons. Charles' law states that a substance's volume and temperature are intimately correlated. As a result, the density of the balloon decreases, and its volume increases. Due to the gas cooling off due to the low temperature, the balloon's volume shrinks. The helium balloon rises because it is lighter than the same amount of air at ambient temperature. It is heavier than the same volume of air at low temperatures because its volume is too small.
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The motion of a particle is given by x = A sin3(ωt).
(a) Enter an expression for the amplitude of the particle's motion.
(b) Enter an expression for the particle's velocity, v.
(c) Enter an expression for the particle's acceleration, a.
you cannot use v in the answers, and all trig functions can only contain (ωt).
The motion of a particle is given by x = A sin3(ωt) where the amplitude is
x/sin3(ωt).
What does a SHM's amplitude mean?The largest deviation a particle makes from its typical position is the amplitude of a SHM. A point on a vibrating body or wave can move as far or as far from its equilibrium position as possible, or at its greatest amplitude. The length of the vibration route is divided in half by this value.
b) The expression for the particle's velocity
=> sin^-1(x)/3t.
c) The expression for the particle's acceleration
=>ωt = a = sin^-1(x)/3.
How do angular velocity and acceleration relate?The rate at which angular velocity changes is referred to as angular acceleration. In an equation, angular acceleration is written as follows: = t, where t is the change in time and is the change in angular velocity.
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Looking at the ground beside a moving vehicle helps you judge its__________.
Options:
size
Blind spots
proximity
speed
weight
By looking at the ground beside a moving vehicle helps we can judge its speed and tell how fast it is moving.
What exactly is speed?
The rate at which an object's position changes, measured in metres per second, is referred to as speed. For instance, if an object begins at zero and moves three metres in three seconds, its speed is one metre per second. The formula for speed is straightforward: distance divided by time.
The rate at which an object moves from one position or location to another is referred to as its speed. Examine the definition of speed and use the steps provided to calculate an object's average speed.
The average speed of an object is the total distance travelled divided by the time required to travel that distance. It is a scalar quantity, which means that its only definition is magnitude.
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If the maximum voltage of an ac signal is 8.0 V, what is the rms value of this voltage? O 2.8V O 6.2 V O 4.0 V O 5.7 V O 16.0 V
Answer: O 2.8V
Explanation: i did this before lol
The figure above shows four very thin parallel planes of charge with equal separation between them. The charge density on plate 1 is -2 ?. The charge density on plate 2 is 3 ?. The charge density on plate 3 is -5 ?. The charge density on plate 4 is 1 ?. Your answers for the electric field must include the correct sign. We choose positive electric field along the positive x-direction.
The electric field of four very thin parallel planes of charge with equal separation between them is 0.33 x 10-7N/C.
Given The charge density on plate 1 is -2σ
The charge density on plate 2 is 3σ
The charge density on plate 3 is -5σ
The charge density on plate 4 is 1σ
We know that electric field due to each plate is E = σ/2ε0 where σ is the surface charge density and ε0 = 8.854 x 10-12 C^2/m.
The total surface charge density (σ) = -2+3-5+1 = -3σ
E = -3 x 10^-19/8.85 x 10^-12 = -0.33 x 10^-7N/C
Hence the electric field on each plate = 0.33 x 10-7N/C
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Rank the objects based on the maximum height they reach along the curved incline. Rank from largest to smallest. To rank items as equivalent, overlap them.
Object A reaches the highest point along the curved incline, so it should be ranked first.
What is object?Object is a concept used in object-oriented programming (OOP) which refers to a self-contained entity that contains data and code to manipulate the data. It is an instance of a class that is defined by the programmer. Objects are used to represent real-world objects, such as a car, or to represent abstract concepts, such as a bank account. Objects are the basic building blocks of OOP and are used to create applications.
Object C is the second highest, and Object B is last. This ranking from largest to smallest can be visualized by lining them up from left to right, with Object A on the left, Object C in the middle, and Object B on the right.
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The radius of the London Eye, a huge observation wheel on the banks of the Thames, is 67.5 m and its mass is 1.90 x 106 kg. The cruising angular speed of the wheel is 3.62 x 10-3 rad/s. Problem 08.029.a - Work done by the motor How much work does a motor need to do to bring the stationary wheel up to cruising speed?
Work done by the motor of London eye wheel is 5.67 x 10^4 J
How does physics apply to wheels?For two reasons, dragging a load on wheels is much simpler than dragging it on the ground. Rotors lessen friction. The wheels dig in and rotate around strong rods called axles rather than just gliding over the surface.
I = mr2 = 1.9 x 10^6 x (67.5)2
=> 8.65 x 10^9
Work done => 1/2 x 8.65 x 10^9 x (3.62 x 10^-3)2
=> 5.67 x 10^4 J
What does angular velocity ω mean?Since the radian is a dimensionless quantity and the SI unit of angular velocity is radians per second, the SI units of angular velocity can be written as s1. The Greek letter omega (or, occasionally, ) is used to denote angular velocity.
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In the lactose operon of E. coli, the CRP-cAMP complex is a(n) _____ of transcription.
O positive regulator
O negative regulator
O enhancer
O silencer
The correct answer is positive regulator
In the lactose operon of E. coli, the CRP-cAMP complex is a(n positive regulator of transcription.
What is Lactose ?
Lactose is a naturally occurring sugar found in milk and other dairy products like yoghurt and ice cream. It is created when two other sugars, glucose and galactose, combine.
The body converts lactose into these two sugars using an enzyme called lactase so that it may be digested. You might not be able to digest or absorb lactose effectively if your body doesn't produce enough lactase, which could result in lactose intolerance symptoms.
Sugars come in a wide variety of forms. Some are what are known as "simple" sugars, monosaccharides, which are single sugar units. Disaccharides, which are composed of connected pairs of monosaccharides, are another type of sugar.
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Can light from a light bulb cause skin cancer?
Answer:
Yes
Explanation:
Light Bulbs emit UV radiation which can cause skin cancer.
(1) Thevelocity of a plantier is given by V(t) = 20t² - 100€ + 5got a, when will the accteration of a particle is zero by what the velocity of the Particles when its acceleration is zero
Answer:
I really don't want to go out for a week and I deserve to be wit me she said that she would have been able even better then again this year moma and she was the one that was earlier than you and my parents are going through a tough time and it was broken down into the last time I was coming from but I see an feel a lot of hate
Explanation:
no exceptions
Marco wants to ask Ava out on a school date. He is excited at the prospect of spending time with her but is nervous that she will reject him. What type of conflict is this? A. Approach-Avoidance B. Double Approach-Avoidance C. Avoidance-Avoidance D. Approach-Approach
The kind of conflict that Macro is facing is called Double Approach-Avoidance. Option B
What is a conflict?We have to know that we talk about a conflict when we do have doubts about the course of action that we would need to take. Thus there is a conflict when you are not sure that the path that you propose to take in a given case would be the right path that would bring the result that you are expecting to have and this would bring about the existence of some kind of doubts in the mind.
In this case; Marco wants to ask Ava out on a school date. He is excited at the prospect of spending time with her but is nervous that she will reject him. This would then arouse some kind of conflict in his mind and this is the kind of conflict that we are trying to describe here.
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Rank the following capacitors on the basis of the dielectric constant of the material between the plates. Rank from largest to smallest. To rank items as equivalent, overlap them.
Rank of the capacitors are 6 > 4 > 1 > 3 > (2 = 5)
What is Capacitor?
A two-terminal electrical device known as a capacitor is capable of storing energy in the form of an electric charge. It is made up of two electrical wires that are spaced apart by a certain amount. Vacuum may be used to fill the space between the conductors, or a dielectric, an insulating substance, may be used instead
Pairs of opposing charges are held apart in capacitors to store energy. A parallel plate capacitor has the most basic design and is made up of two metal plates with a space in between them. However, many capacitor types are produced in a wide variety of shapes, sizes, lengths, girths, and materials.
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A projectile is launched from point A with the initial conditions shown in the figure. Determine the slant distance s which locates the point B of impact. Calculate the time of flight t.
The torque about the axis of rotation on the left produced by force F1onB is 600 Nm and the torque about the axis of rotation on the left produced by force F2onB is also 600 Nm. Force F3onB must be exerted at a distance of 0.5 m from the axis of rotation to balance the torques produced by F1onB and F2onB.
F1onB Torque: 600 Nm
F2onB Torque: 600 Nm
F3onB Distance: 0.5 m
1. To determine the torque about the axis of rotation on the left produced by force F1onB, we need to calculate the moment arm. The moment arm is the perpendicular distance from the axis of rotation to the line of action of the force. The moment arm for F1onB is 0.5 m, so the torque produced by F1onB is 600 Nm (F1onB x Moment Arm).
2. To determine the torque about the axis of rotation on the left produced by force F2onB, we need to calculate the moment arm. The moment arm for F2onB is 0.5 m, so the torque produced by F2onB is also 600 Nm (F2onB x Moment Arm).
3. To determine the distance from the axis of rotation at which F3onB must be exerted to balance the torques produced by F1onB and F2onB, we need to use the equation Torque = Force x Moment Arm. Since the total torque must equal 0, we can set up the following equation: 600 Nm + 600 Nm + (F3onB x Moment Arm) = 0. Solving for the Moment Arm, we get Moment Arm = -0.5 m, which is the distance from the axis of rotation at which F3onB must be exerted to balance the torques produced by F1onB and F2onB.
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The luminosity of the star Aldebaran is 520 times
that of the Sun. The wavelength of light at peak
intensity for Aldebaran is 740 nm and the wavelength
of light at peak intensity for the Sun is 500 nm.
a Explain whether Aldebaran is cooler or hotter
than the Sun.
b Calculate the ratio:
radius of Aldebaran / radius of the Sun.
Since the wavelength for Aldebaran is longer then, it is cooler than the Sun. The ratio of the radiuses is 22.8
How to calculate ratio?a) The temperature of a star can be determined by its peak wavelength of light emission, which is related to its luminosity. The hotter the star, the shorter the peak wavelength of light. Since the wavelength of light at peak intensity for Aldebaran is longer (740 nm) than that for the Sun (500 nm), we can conclude that Aldebaran is cooler than the Sun.
b) The radius of a star can be related to its luminosity through the equation L = 4πR^2σT^4, where L is the luminosity, R is the radius, σ is the Stefan-Boltzmann constant, and T is the temperature. Since the luminosity of Aldebaran is 520 times that of the Sun, we have the equation ratio: R_Aldebaran / R_Sun = sqrt(L_Aldebaran / L_Sun) = sqrt(520) = 22.8.
Thus, the ratio of the radius of Aldebaran to the radius of the Sun is 22.8.
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The diagram shows a car and a van, just before and just after the car collided with
the van.
Mass = 1200 kg
v = 10 m/s
(1)
Mass=3200 kg
v=0m/s
BAPTI
v=2m/s
After collision
Use the information in the diagram to calculate the change in the momentum
of the car.
Show clearly how you work out your answer and give the unit.
Before collision
Change in momentum =
(3)
Change in momentum before collision 12000Kgm/s and velocity of van after collision is 3m/s.
What is momentum conservation and how does it work?According to the rule of conservation of momentum, absent an external force, the combined momentum of two or more bodies operating upon one another in an isolated system remains constant. As a result, momentum cannot be gained or lost. According to the principle of momentum conservation, momentum is only modified by the action of forces as they are outlined by Newton's equations of motion; momentum is never created nor destroyed inside a problem domain.
Momentum before collision=> mava + mbvb
=> (1200 x 10) + (3200 x 0)
=> 12000Kgm/s
Momentum after collision => 2400 + 3200 v(after)
Law of conservation of momentum
12000 = 2400 - 3200 v (after)
=> Velocity after collision acquired by van = (12000-2400)/3200
=> 3m/s
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X-rays produced in the dentist's office typically have a wavelength of 0.30nm .What is the frequency of these rays? f=_______Hz
The frequency of these rays will be 3.33Hz
What does wavelength mean?
A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places (adjacent crests) in the consecutive cycles.
The frequency is measured in cycles per second and represents the number of vibrations that pass over a specific area in one second (Hz). The relationship between frequency and wavelength is inversely proportional. Less frequency corresponds to a longer wavelength and vice versa. The relationship between these two parameters is justified by the fact that a wave's speed is equal to the product of its frequency and wavelength.
Given,
Wavelength is 0.30nm
Frequency will be 1/wavelength
f= 1/0.30
f=3.33Hz
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Irene has excellent fine motor coordination. In what activity would she MOST likely excel based on this skillset?
A.) Walking
B.) Doing gymnastics
C.) Playing the piano
D.) Swimming
Answer: C) Playing the piano
Explanation: Someone with excellent fine motor coordination would be good at things that require being precise and having good hand coordination, therefore they would most likely excel at playing the piano.
The correct answer to this question would be option (c) Playing the piano
The ability to coordinate eye and hand movements in order to perform accurate manipulative motions is known as fine-motor coordination. It necessitates controlling the body's small muscles (eye-hand coordination). The instinctive aversion and grabbing responses, which consolidate and get better with time and experience, seem to be the earliest forms of fine-motor control.
The bulk of manipulating operations need the coordination of two hands. These are referred to as bi-manual actions. Uni-manual actions are tasks that only use single hand, such as opening doors. Writing by hand or drawing are examples of the visual group of manipulating actions.
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When heat is added or removed from a substance, it's temperature and thermal energy will be ______.
Directly Proportional
Temperature is directly proportional to heat. The more the heat more the temperature there are a number of scales like degree Celsius, Fahrenheit, and Kalvin (SI Unit) of temperature which is calculated by the mercury.
As on high heat, mercury expands and on its expansion, we measure on a scale which simply means more the heat more the expansion, and more the temperature on the scale, and wise- versa.
And if we talk about thermal energy(Q) is also directly proportional to a change in temperature (negative when temperature decreases and increases on increasing the temperature). where Q = mc*(change in temperature). where m for the mass, and C is the constant for the type of substance we are taking to transfer the heat.
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The Complete Question is -
How Heat is related to temperature and thermal energy?