Suppose a man stands in front of a mirror as shown in Figure 25.50. His eyes are 1.76 m above the floor, and the top of his head is 0.11 m higher. Find the height above the floor of the top and bottom of the smallest mirror in which he can see both the top of his head and his feet. chegg
Answers
The height of the mirror should be at least 1.87 m above the floor. Therefore, the height of the mirror should be at least 1.87 m above the floor to allow the man to see both the top of his head and his feet.
To find the height of the mirror, we need to consider the line of sight from the man's eyes to the top of his head and feet. The distance from the man's eyes to the top of his head is 0.11 m. So, the line of sight from his eyes to the top of his head is at an angle of 90 degrees. Now, we need to find the angle of depression from his eyes to his feet. The distance from his eyes to the floor is 1.76 m. The distance from his feet to the floor can be found by subtracting the height of his eyes from the height of his head: 0.11 m.
Using the tangent function, we can find the angle of depression:
tan(angle of depression) = (height of feet - height of eyes) / distance from eyes to the floor
tan(angle of depression) = (0.11 m - 1.76 m) / distance from eyes to the floor
tan(angle of depression) = -1.65 m / distance from eyes to the floor
To find the height of the mirror, we need to find the distance from the eyes to the floor when the angle of depression is 90 degrees. So, we can set up the equation:
tan(90 degrees) = -1.65 m / distance from eyes to the floor
Since tan(90 degrees) is undefined, the distance from the eyes to the floor when the angle of depression is 90 degrees is infinite.
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Related Questions
Read through the and calculate the predicted change in kinetic energy of the oblect compared to 50 kg ball traveling at 10 m/s . 50 kg ball traveling at 20 n / s would havekinetic energy 50 kg traveling at 5 m/s would have energy 50 kg person falling at 10 m/s would havekinetic energy
Answers
Answer:
A 50 kg ball traveling at 20 m/s would have 4 times more kinetic energy.
A 50 kg ball traveling at 5 m/s would have 4 times less kinetic energy.
A 50 kg person falling at 10 m/s would have the same kinetic energy.
Explanation:
hope this helps:)
On the initial climbout after takeoff with the autopilot engaged, you encounter icing conditions. In this situation, it is recommended that A. you trust that the autopilot will safely handle the icing situation. B. the vertical speed mode be disconnected. C. the vertical speed mode remain engaged.
Answers
On the initial climbout after takeoff with the autopilot engaged, you encounter icing conditions. In this situation, it is recommended that A. the given situation, it is recommended that the vertical speed mode be disconnected.
What is Vertical speed mode?Vertical speed mode is a flight control mode used in aircraft autopilot systems, which controls the aircraft's vertical speed by adjusting the pitch angle of the aircraft's wings, using data from vertical speed sensors and other instruments
What is autopilot?Autopilot is a system used in aircraft, ships, and other vehicles to automatically control and maintain their course, speed, altitude, and other parameters, with minimal human intervention, using sensors and computerized control systems.
According to the given information:
In the given situation, it is recommended that the vertical speed mode be disconnected. Trusting the autopilot to handle icing conditions may not be safe as it may not have the capability to detect and respond appropriately to the level of icing. Disengaging the vertical speed mode will allow the aircraft to maintain a constant airspeed and prevent the autopilot from potentially increasing the rate of climb, which could lead to ice buildup on the wings. Therefore, it is important for pilots to be aware of the icing conditions and take appropriate actions to ensure the safety of the flight.
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Consider a three-dimensional harmonic oscillator, whose state vector ) is: |) = |az)|a₂) |az) where lar), lay) and laz) are quasi-classical states (cf. Complement Gy) for one- dimensional harmonic oscillators moving along Ox, Oy and Oz, respectively. Let L = Rx P be the orbital angular momentum of the three-dimensional oscillator. a. Prove: (L₂) = iħ (aza-aαv) AL₂ = √/la1² + |a₂|² and the analogous expressions for the components of L along Or and Oy. b. We now assume that: {Lz) = (Ly) =0, (L₂) = Ali> 0 Show that a must be zero. We then fix the value of A. Show that, in order to minimize ALT + ALy, we must choose: ag = -iαy = eivo V₂ (where po is an arbitrary real number). Do the expressions AL.AL, and (AL)²+ (AL)2 in this case have minimum values compatible with the inequalities obtained in question b. of the preceding exercise? c. Show that the state of a system for which the preceding conditions are satisfied is necessarily of the form: |v) = cx (ar) |xnr=k, n₁=0, n₂=0) k with: (a + iat) k |Xn,=k, n=0,1 ,n₁=0, n₂ =0) |4n₂=0, n₁=0, n₂ =0) √2kk! ak Ck (α) e-la/²/2 = √k! ; ar = ¹0 √ (the results of Complement Gy and of § 4 of Complement Dyi can be used). Show that the angular dependence of Xn, k, n=0, n.-0) is (sin ei)k. L2 is measured on a system in the state ). Show that the probabilities of the various possible results are given by a Poisson distribution. What results can be obtained in a measurement of Lz that follows a measurement of L2 whose result was 1(1+1)ħ²? =
Answers
This is a multi-part question involving a three-dimensional harmonic oscillator and its angular momentum.
a. The orbital angular momentum operator `L` can be written in terms of the position and momentum operators as `L = r x p`. The squared magnitude of the angular momentum is given by `L^2 = Lx^2 + Ly^2 + Lz^2`. The `z` component of the angular momentum can be written as `Lz = xp_y - yp_x`, where `p_x` and `p_y` are the momentum operators along the `x` and `y` directions, respectively.
Since the state vector `|ψ⟩` is given as a product of quasi-classical states for one-dimensional harmonic oscillators along each axis, we can use the ladder operator formalism to evaluate the action of `Lz` on `|ψ⟩`. The ladder operators for a one-dimensional harmonic oscillator are defined as `a = (x + ip) / √2` and `a† = (x - ip) / √2`, where `x` and `p` are the position and momentum operators, respectively.
Using these definitions, we can write the position and momentum operators in terms of the ladder operators as `x = (a + a†) / √2` and `p = (a - a†) / i√2`. Substituting these expressions into the definition of `Lz`, we get:
`Lz = (xp_y - yp_x) = ((a_x + a_x†) / √2)((a_y - a_y†) / i√2) - ((a_y + a_y†) / √2)((a_x - a_x†) / i√2)`
` = (1/2i)(a_xa_y† - a_x†a_y - a_ya_x† + a_y†a_x)`
` = iħ(a_xa_y† - a_x†a_y)`
where we have used the commutation relation `[a, a†] = 1`.
The action of this operator on the state vector `|ψ⟩` is given by:
`(Lz)|ψ⟩ = iħ(a_xa_y† - a_x†a_y)|αx⟩|αy⟩|αz⟩`
`= iħ(αxa_y† - αya_x†)|αx⟩|αy⟩|αz⟩`
`= iħ(αx - αy)Lz|αx⟩|αy⟩|αz⟩`
where we have used the fact that the ladder operators act on quasi-classical states as `a|α⟩ = α|α⟩` and `a†|α⟩ = d/dα|α⟩`.
Since `(Lz)|ψ⟩ = iħ(αx - αy)Lz|ψ⟩`, it follows that `(Lz)^2|ψ⟩ = ħ^2(αx - αy)^2(Lz)^2|ψ⟩`. Therefore, we have:
`(L^2)|ψ⟩ = (Lx^2 + Ly^2 + Lz^2)|ψ⟩`
`= ħ^2(αx^2 + αy^2 + (αx - αy)^2)(L^2)|ψ⟩`
`= ħ^2(αx^2 + αy^2 + αx^2 - 2αxαy + αy^2)(L^2)|ψ⟩`
`= ħ^2(3αx^2 + 3αy^2 - 4αxαy)(L^2)|ψ⟩`
This shows that `(L^2)|ψ⟩` is proportional to `(L^2)|ψ⟩`, which means that `(L^2)` is an eigenvalue of the operator `(L^2)` with eigenstate `|ψ⟩`. The eigenvalue is given by `(L^2) = ħ^2(3αx^2 + 3αy^2 - 4αxαy)`.
b. If we assume that `(Lz)|ψ⟩ = (Ly)|ψ> = 0`, then from part (a) above it follows that `(Ly)^2|ψ> = ħ^2(3ay^3-4axay+3az²)(Ly)^²|ψ>` and `(Lz)^2|ψ> = ħ^2(3az^3-4axaz+3ay²)(Lz)^²|ψ>`. Since `(Ly)^2|ψ> = (Lz)^2|ψ> = 0`, it follows that `3ay^3-4axay+3az² = 0` and `3az^3-4axaz+3ay² = 0`. Solving these equations simultaneously, we find that `ax = ay = az = 0`.
If we fix the value of `(L^2)`, then from part (a) above it follows that `(L^2) = ħ^2(3αx^2 + 3αy^2 - 4αxαy)`. Since `ax = ay = az = 0`, this equation reduces to `(L^2) = 0`.
To minimize `(Lx)^2 + (Ly)^2`, we must choose `αx` and `αy` such that the expression `3αx^2 + 3αy^2 - 4αxαy` is minimized. This can be achieved by setting `αx = -iαy`, where `αy` is an arbitrary complex number. In this case, the expression becomes `3αx^2 + 3αy^2 - 4αxαy = 6|αy|^2`, which has a minimum value of `0` when `αy = 0`.
c. If the conditions in part (b) are satisfied, then the state vector `|ψ⟩` can be written as a linear combination of eigenstates of the operator `(Lz)^2`. These eigenstates are of the form `|n⟩|m⟩|k⟩`, where `n`, `m`, and `k` are non-negative integers and `|n⟩`, `|m⟩`, and `|k⟩` are eigenstates of the number operator for the one-dimensional harmonic oscillator along each axis.
The action of the ladder operators on these states is given by:
`a_x|n⟩|m⟩|k⟩ = √n|n-1⟩|m⟩|k⟩`
`a_x†|n⟩|m⟩|k⟩ = √(n+1)|n+1⟩|m⟩|k⟩`
`a_y|n⟩|m⟩|k⟩ = √m|n⟩|m-1⟩|k⟩`
`a_y†|n⟩|m⟩|k⟩ = √(m+1)|n⟩|m+1⟩|k⟩`
`a_z|n⟩|m⟩|k⟩ = √k|n⟩|m⟩|k-1⟩`
`a_z†|n⟩|m⟩|k⟩ = √(k+1)|n⟩|m⟩|k+1⟩`
Since we have assumed that `(Lz)|ψ> = (Ly)|ψ> = 0`, it follows that:
`(Lz)|ψ> = iħ(a_xa_y† - a_x†a_y)|ψ> = iħ(∑_n,m,k c_nmk(a_xa_y† - a_x†a_y)|n>|m>|k>)`
`= iħ(∑_n,m,k c_nmk(√n√(m+1)|n-1>|m+1>|k> - √(n+1)√m |n+1>|m-1>|k>))`
`= iħ(∑_n,m,k (c_(n+1)(m+1)k√(n+1)√(m+1) - c_n(m-1)k√n√m)|n>|m>|k>)`
`= 0`
This implies that for all values of `n`, `m`, and `k`, we must have:
`c_(n+1)(m+1)k√(n+1)√(m+1) - c_n(m-1)k√n√m = 0`
Similarly, since `(Ly)|ψ> = 0`, it follows that:
`(Ly)|ψ> = iħ(a_xa_z† - a_x†a_z)|ψ> = iħ(∑_n,m,k c_nmk(a_xa_z† - a_x†a_z)|n>|m>|k>)`
`= iħ(∑_n,m,k c_nmk(√n√(k+1)|n-1>|m>|k+1> - √(n+1)
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How far should the lens be from the film (or in a present-day digital camera, the CCD chip) in order to focus an object that is infinitely far away (namely the incoming light rays are parallel with the principal axis of the system). (b) How far should the lens be from the film to focus an object at a distance
Answers
For an object infinitely far away, the lens should be at the focal length. For a specific distance, use the lens equation.
When focusing an object that is infinitely far away, the incoming light rays are parallel with the principal axis of the system.
In this case, the lens should be at its focal length to achieve focus.
This is because parallel rays of light converge to a single point at the focal length of the lens.
For objects at specific distances, the lens equation can be used to determine the required distance between the lens and the film or CCD chip.
The lens equation is 1/f = 1/s + 1/s', where f is the focal length of the lens, s is the distance from the lens to the object, and s' is the distance from the lens to the image.
By rearranging the equation, the distance from the lens to the image can be calculated.
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Is this acceleration away, acceleration back , constant speed back, constant speed away, constant speed (or velocity), or constant negative acceleration (decreasing speed or velocity ) at a constant rate?
Answers
Answer:
ya daddy is my zaddy
Explanation:
Referring to the POWER trendline equation from analysis step 2, what mathematical relationship exists between the wave speed and the density of the medium.
Answers
The mathematical relationship exists between the wave speed and the density of the medium is that the density of the medium is inversely proportional to the wave speed.
What is wave speed?The amount of space a wave covers in a certain amount of time, such as the number of meters it covers in a second, is known as its wave speed. The following equation relates wave speed to both wave frequency and wavelength: Wavelength x Frequency = Speed.
Since sound is a mechanical wave, it moves through a medium by being compressed and rarefied. In an elastic medium, its velocity is proportional to the square root of the tension present. More elasticity in the medium results from higher density, which also increases the ease with which compression and rarefaction can occur. In this manner, the density increases while the sound velocity increases.
As a result, the square root of the medium's density and the velocity of sound in that medium are inversely related.
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when you see a yellow car in a parking lot, why do you see it as yellow?
The yellow paint reflects all colors except yellow light.
The yellow paint absorbs mostly yellow light.
The yellow paint reflects mostly yellow light.
Answers
Answer:
A IS THE CORRECT ANSWER FOR THE QUESTION
Answer:
A
Explanation:
500nm light is incident on a single 10 micron wide slit, at what angle does the first minimum occur?
Answers
When 500nm light is incident on a single 10 micron wide slit, the angle at which the first minimum occurs is 3.5 degrees.
The angle at which the first minimum occurs can be calculated using the formula $\theta = \frac{1.22 \lambda}{D}$, where $\lambda$ is the wavelength of the light, and $D$ is the width of the slit. In this case, $\theta = \frac{1.22 \times 500 \times 10^{-9}}{10 \times 10^{-6}}$ = 0.061 radians, or 3.5 degrees.
To explain further, light from the slit is sent in all directions, however due to the slit's size, the angles at which the light travels away from the slit can only reach certain values. If a detector is placed further away from the slit, the light waves arriving at that detector will have the same magnitude, but will be out of phase with one another, creating destructive interference and forming a series of minima (lowest points) and maxima (highest points). The distance between two consecutive maxima or minima is known as the fringe spacing, and is determined by the formula $\lambda = \frac{D}{sin(\theta)}$, where $\theta$ is the angle at which the first minimum is observed.
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Increasing the distance between an electromagnet and the compass will cause the observed effect of the compass to _____.
Answers
Increasing the distance between an electromagnet and the compass will cause the observed effect of the compass to decrease in strength
What would the Increasing the distance between an electromagnet and the compass cause?
The strength of the magnetic field produced by an electromagnet decreases as the distance from the electromagnet increases. This means that if the distance between the electromagnet and the compass increases, the magnetic field that the compass is experiencing will weaken.
As a result, the observed effect of the compass will decrease in strength as the distance between the electromagnet and the compass increases.
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When sodium and chlorine combine to form sodium
chloride, sodium chloride is the:
a. originator
b. reactant
c. product
d. produce
Answers
Answer:
product
Explanation: it's the product of chlorine and sodium
Answer:
y
Explanation:
How is the answer D?
Answers
The graph that corresponds to 0.1 s in one complete cycle is graph D.
option D is the correct answer.
What is the period of a wave?The period of a wave is the time for a particle on a medium to make one complete vibrational cycle. Period, being a time, is measured in units of time such as seconds, hours, days or years.
Also, the period of a wave is the amount of time it takes for a wave to complete one wave cycle or wavelength.
From the given parameter, the coil rotates 10 times in one second. The period of the coil is calculated as;
Period = 1 s / 10
Period = 0.1 s
From the graphs, the only option that has one complete cycle in one second is option D.
Check option D, half cycle is 0.05 s and one full cycle is 0.1 s.
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If an object moves 75 m/s in 15 seconds, how far did the object move?
Answers
The object moved a displacement of 1125 m.
What is meant by velocity ?Velocity of an object is defined as the time rate of change of its displacement.
Here,
Velocity of the object, v = 75 m/s
Time taken for travelling, t = 15 s
We know that, the velocity is the displacement covered per unit time.
v = d/t
Therefore, the displacement covered by the object,
d = v x t
d = 75 x 15
d = 1125 m
Hence,
The object moved a displacement of 1125 m.
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What is it called when a sound wave transfers its energy to a new medium?
a. Reflection
b. Transmission
c. Echo
d. Absorption
Answers
Answer:
c. eco
ya que hay trasmisión de energía de un lado al hacer ecos
what can i about charges that were made against me but dropped by the pwerson who made them but are still on record
Answers
If you have charges that were made against you but were dropped by the person who made them but are still on record, you can still take steps to address the situation. It is important to note that having charges on your record can have negative effects on your life, such as hindering your ability to secure employment and housing.
To address this situation, you may need to seek legal advice or the assistance of a criminal defense attorney. They will be able to guide you through the process of getting the charges removed from your record, or having them expunged. This will involve filing a petition to the court, providing evidence that the charges were dropped, and demonstrating that you meet the eligibility criteria for expungement or record sealing
. The process may vary depending on your location and the type of charges you faced, so it is important to seek guidance from a legal professional.To summarize, if you have charges that were made against you but were dropped by the person who made them but are still on record, you can seek legal advice or the assistance of a criminal defense attorney to have the charges removed from your record through a petition to the court.
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plzzz help 20 points
Answers
SUPER EASY HELPPP!!! WILL GIVE BRAINLIEST
How does the Earth move within the Milky Way?
a.) The Earth, with the rest of the solar system, revolves around the galaxy’s core.
b.) The Earth, orbits the moon, which moves around the galaxy’s core.
c.) The Earth wanders through the galaxy.
d.) The Earth does not move in the Milky Way.
Answers
Answer:
B
Explanation:
Answer:
A. The Earth, with the rest of the solar system, revolves around the galaxy's core.
Explanation:
None of the other answers make sense and since the sun in the core of the milky way, the earth revolves around the sun, therefore moves within the Milky Way.
electricity consumption, cost and environmental impact of electricity provision at local, national and global scale.
Answers
The environmental problems directly related to energy production and consumption include air pollution, climate change, water pollution, thermal pollution, and solid waste disposal. The emission of air pollutants from fossil fuel combustion is the major cause of urban air pollution.
Any substance (solid, liquid, or gas) or energy can cause pollution (such as radioactivity, heat, sound, or light). Both naturally occurring contaminants and imported substances/energies can be considered pollutants, which are the elements of pollution. Despite the fact that natural disasters can result in environmental contamination, the word pollution often suggests that the toxins came from an artificial source, or a source made possible by human activity. Point source and nonpoint source pollution are two common categories of pollution.
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A train car of mass 16,500 kg moves along the railroad track with a constant speed of 14 m/s. What is the momentum of the car?
Answers
Explanation:
Here,
Mass=16,500kg.
speed=14 m/s.
we know that,
\(\tt{ p=m×v }\) ⠀
where,
p=momentum
m=mass
v=velocity
according to the question,
\(\tt{ momentum =mass×velocity }\) ⠀
\(\tt{ 16500×14 }\) ⠀
\(\tt{ 231000~kg.m/s }\) ⠀
so,
velocity of the car is 231000kg.m/s
A satellite has a circular orbit around the Earth. It briefly fires its engines and increases its speed by two percent. After its engines shut off, its new orbit will be
Answers
When a satellite has a circular orbit around the Earth, it briefly fires its engines, and increases its speed by two percent.
What will be its new orbit?When a satellite in a circular orbit around the Earth fires its engine and increases its velocity, the size of its orbit becomes an ellipse rather than a circle. As a result, the satellite's apogee distance will become larger, and the perigee distance will become smaller.
If the satellite's initial circular orbit had a radius of r, and the orbit velocity was V, the satellite's new velocity would be V + 0.02V = 1.02V. Because the circular orbit's speed is constant, the satellite's new orbit will have a new radius, R, that corresponds to the new velocity of 1.02V.
The distance of R can be calculated using the following equation:R = (GM/ (1.02V)²)Where R is the new radius, V is the previous velocity, G is the universal gravitational constant, and M is the mass of Earth.
Therefore, its new orbit will be an ellipse with a smaller perigee distance and a greater apogee distance than the initial circular orbit's radius, r.
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The first harmonic of a string tied down at both ends has a frequency of 26 Hz. If the length of the string is 0.83 m, what is the speed of waves on the string?
Answers
Answer:
the speed of the wave on the string is 43.16 m/s
Explanation:
Given;
first harmonic of the wave formed by the string, f₀ = 26 Hz
length of the string, L = 0.83 m
The wavelength for first harmonic of the wave is calculated as;
L = N ----> N
L = λ₀/2
λ₀ = 2L
The speed of the wave on the string is calculated as follows;
v = f₀λ₀
v = f₀ x 2L
v = 26 x 2 x 0.83
v = 43.16 m/s
Therefore, the speed of the wave on the string is 43.16 m/s
What types of metal solids, (Other then aluminum foil) Would be able to work just like it?
Answers
The type of metal solids other then aluminum foil would be able to work is Copper,Tin,Stainless steel,Brass,Nickel and Silver foils.
There are several types of metal solids that can work similarly to aluminum foil in certain applications. Some options include:
1. Copper foil: Copper foil has good electrical conductivity and is often used in electrical and electronic applications, including circuit boards and electromagnetic shielding.
2. Tin foil: Tin foil, also known as tinfoil, is a thin sheet of tin. It is commonly used for wrapping food items and has similar properties to aluminum foil.
3. Stainless steel foil: Stainless steel foil is resistant to corrosion and has high strength. It can be used for various applications, such as heat exchangers, laboratory equipment, and packaging.
4. Brass foil: Brass foil is an alloy of copper and zinc, which provides good electrical and thermal conductivity. It can be utilized in applications similar to copper foil.
5. Nickel foil: Nickel foil has excellent resistance to corrosion and high-temperature environments. It is commonly used in battery manufacturing, aerospace components, and chemical processing.
6. Silver foil: Silver foil is highly conductive and often used in specialized applications where high conductivity is required, such as in certain types of electronic circuits and sensors.
These metal foils may not be as readily available or as widely used as aluminum foil, but they can serve specific purposes depending on their unique properties. It's important to consider factors such as electrical conductivity, thermal conductivity, corrosion resistance, and cost when selecting the appropriate metal foil for a particular application.
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What is the largest particle size that a stream can transport at a velocity of 5 centimeters per second?
Answers
a ping-pong ball of mass m rolls off the edge of a table that is 1.0 m high. when the ball strikes the floor its speed is5.0 m/s. how fast was it rolling when it left the table.
Answers
The ball was rolling at a speed of 4.44 m/s when it left the table.
What is speed?
Speed is a scalar quantity that describes the magnitude of an object's velocity, or the rate at which an object is moving. It is defined as the distance traveled by an object divided by the time it takes to travel that distance. The unit of speed is usually meters per second (m/s) or kilometers per hour (km/h).
We can use the conservation of energy principle to solve this problem. The initial potential energy of the ball when it was at the edge of the table is equal to its weight multiplied by its height above the floor:
PEi = mgh
PEi = m * 9.8 m/s² * 1.0 m = 9.8 N * m
At the moment the ball strikes the floor, all of its potential energy has been converted into kinetic energy:
KEf = 1/2 * m * v²
where v is the velocity of the ball just before it strikes the floor. We can equate the initial potential energy to the final kinetic energy and solve for the velocity of the ball when it left the table:
PEi = KEf
9.8 N * m = 1/2 * m * v²
v²= 2 * PEi / m = 2 * 9.8 N * m / m = 19.6 m²/s²
v = √(v²) = √(19.6 m²/s²) = 4.44 m/s
So, the ball was rolling at a speed of 4.44 m/s when it left the table.
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I need the answer ASAP!
How does the Newton’s Law relate to the force of gravity
Answers
Answer:
Newton's second law of motion states that the acceleration of a system is directly proportional to and in the same direction as the net external force acting on the system, and inversely proportional to its mass. If the only force acting on an object is due to gravity, the object is in free fall.
Explanation:
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What is the frequency of a wave that has a speed of 240 m/s and a wavelength of 0.20 m?
Answers
Answer:
Frequency of the wave = 1200 HertzExplanation:
Given :-
Wavelength = 0.20 m Wave speed = 240 m/sSolution :-
Frequency of a wave is given by :
\(\sf F = \dfrac{v}{\lambda} \)where,
F is frequency,v is wavespeed ,\(\sf\lambda\) is wavelengthOn substituting the values we get :
\(\dashrightarrow \sf F = \dfrac{240}{0.20} \\ \\ \dashrightarrow \rm F = 1200 \: Hz \\\)
Hence, Frequency of the wave is 1200 Hertz1 A student says that current is the amount of charge. Is he correct? Explain your answer.
Answers
Answer:
No he's not correct. Current is the rate of flow of charge. 1 Ampere is the amount of 1 coulomb of charge that flows per second. 10 Ampere would then be 10 coulomb of charge flowing in one second.
how is geothermal energy trapped? state a draw back of this kind of energy.
Answers
Answer:
Geothermal energy can be trapped using geothermal plants that utilizes steam escaping from the earth surface to make electricity.
The limitations include :
depletion of the geothermal sourcehigh costs of investments required for geothermal systemsExplanation:
Geothermal energy originates in form of heat/steam escaping from the inner parts of the earth surface. The steam trapped is converted to electricity through turbines. The hot water pumped by heat pumps can be used to heat homes or for heating purposes in industries.
The limitations of geothermal energy are high initial capital costs for installing the systems, depletion of geothermal sites after sometime, environmental concerns due to greenhouse gases emissions and land requirements for geothermal projects.
A 25-ohm resistor at steady state draws a current of 10.8 amperes. its temperature is 310 k; the temperature of the surroundings is 300 k. what is the total rate of entropy generation ?
Answers
The total rate of entropy generation is 0.268 J/K.
Entropy, the degree of a gadget's thermal electricity consistent with unit temperature that is unavailable for doing useful paintings. due to the fact work is acquired from ordered molecular motion, the quantity of entropy is likewise a measure of the molecular sickness, or randomness, of a machine.
Resistance of resistor R = 25 ohm
the total rate of entropy generation ?
Current flowing through resistor I = 10 A
Heat generation due to resistance , Q = I2R = 100*25 = 2500 J
Resistor temperature T = 310 K
Surrounding temperature Ts = 300 K
Entropy change for Resistor, heat lost due to the resistance to the surrounding then Q = -ve
(ΔS)syst = - Q/T = - 2500 J/310K = - 8.064 J/K
Entropy change for the system: here heat gain from the resistor, Q = +ve
(ΔS)surr = +Q/Ts = 2500J/300K = 8.333 J/K
Total Entropy generation :
(ΔS)tot = (ΔS)syst + (ΔS) Surr = -8.064 + 8.333 = 0.268 J/K
Learn more about entropy here:- https://brainly.com/question/6364271
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1:
a change in velocity?
Section 4.4
7. What is the acceleration of a car moving
along a straight-line path that increases its
speed from zero to 100 km/h in 10 s?
S
1
2
Answers
\(\\ \tt\longmapsto Acceleration=\dfrac{v-u}{t}\)
\(\\ \tt\longmapsto Acceleration=\dfrac{2.7-0}{2}\)
\(\\ \tt\longmapsto Acceleration=\dfrac{2.7}{10}\)
\(\\ \tt\longmapsto Acceleration=27m/s^2\)
Answer:
Initial velocity=u=0m/sFinal velocity=100km/h=v=100×5/18=500/18=2.7m/sTime=t=10s⟼Acceleration=tv−u
⟼Acceleration=22.7−0
⟼Acceleration=102.7
⟼Acceleration=27m/s2
Justify the shape of energy pyramids