Answer:
The answer is 33.33W or 33.33J/s
Explanation:
P=time rate of work
p=Work/time
P=F×D/T
P=50×10/15
P=500/15
P=33.33W or 33.33J/s
A student is going to the office. He starts out from the classroom and walks 20 m North then stops to
talk. Then he starts for the office again and walks 30 m North, but stops again to talk. Then he walks 10 m
North and finally makes it to the office.
1. Heat opens capillaries and improves blood flow. The reverse is true too: cold capillaries close. Thus, for a black eye where you want to prevent blood buildup causing painful swelling, you use ice.
Now consider a patient who is told to keep hot compresses on an eye infection for 10 minutes. She discovers that her compress is no longer hot after only 5 minutes and therefore wants to keep it warm twice as long. Is the better strategy to use more hot water to keep it warm longer, or use the same amount of water as before, but just make the water hotter?
2. The desert sand is very hot during the day and very cold at night. What does this tell you about its specific heat capacity?
3. James Joule used a spinning set of paddles to heat the water in which they were placed, and by comparing the mechanical energy he put in, and temperature rise of the liquid afterwards, he determined the interconversion between mechanical and thermal energy. Inspired by Joule's experiment, you decide to heat your bath water by pushing your hand through it in circles. Estimate the total distance your hand will have travelled to raise the water temperature by 10°C in a typical bathtub. You may assume your hand exerts a continuous force of 50 N.
4. When cooking frozen cheese ravioli, the directions say to put the 255 grams of cheese-filled pasta into 3 quarts of boiling water. We want to explore, by calculations, why you are told to use 3 quarts when it's obvious that 1 quart would easily cover them all, and get dinner cooked even faster?
Suppose the ravioli are in the freezer at - 40 °C. You may consider the ravioli to have a specific heat of 0. 4 cal/gam-°C, both when frozen and when in water.
(A) By how much does the temperature of the 3 quarts of water drop when you add the frozen ravioli?
(B) How much would the water temperature drop if you used only 1 quart?
(C) So what is the answer? Why do they ask for 3 quarts?
5. The energy of a thunderstorm results from the condensation of water vapor in humid air. Suppose a thunderstorm could condense all the water vapor in 10 km3 of air.
How much heat does this release?
(You may assume each cubic meter of air contains 0. 017 kg of water vapor. )
How does this compare to an atomic bomb which releases an energy of 2 x 1010 kcal?
The given Statement "Heat opens capillaries and improves blood flow. The reverse is true too: cold capillaries close. Thus, for a black eye where you want to prevent blood buildup causing painful swelling, you use ice." is True . Because, When an injury like black eye occurs, blood vessels in affected area can become damaged and leak blood, causing swelling and inflammation.
Applying ice to area can help to constrict blood vessels, slowing down the flow of blood and reducing amount of blood that accumulates in affected area. This can help to reduce swelling and inflammation, as well as alleviate pain and discomfort. Heat can cause blood vessels to dilate which can increase blood flow and promote healing in some cases.
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--The complete Question is, ''Heat opens capillaries and improves blood flow. The reverse is true too: cold capillaries close. Thus, for a black eye where you want to prevent blood buildup causing painful swelling, you use ice. ''
State True or False'-
what is the physical significance of the minus sign in faraday's law? a. it indicates the induced current is flowing backwards. b. it indicates the flux is flowing backwards. c. it indicates the magnet is moving away from the loop. d. it indicates the magnetic field of the induced current opposes the change in flux.
The physical significance of the minus sign in Faraday's law is that it indicates the magnetic field of the induced current opposes the change in flux, the correct option is (d).
The minus sign in Faraday's law indicates that the induced emf (electromotive force) and hence the induced current, flows in a direction that opposes the change in magnetic flux through the circuit. This is known as Lenz's law, which states that an induced current will flow in a direction that opposes the change in the magnetic field that produced it.
Mathematically, Faraday's law is given by:
emf = -dΦ/dt
The change in the magnetic field will induce an emf in the loop, which will cause a current to flow. Lenz's law tells us that the induced current will flow in a direction that produces a magnetic field that opposes the change in the original magnetic field; the correct option is (d).
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The complete question is:
What is the physical significance of the minus sign in faraday's law?
a. It indicates the induced current is flowing backwards.
b. It indicates the flux is flowing backwards.
c. It indicates the magnet is moving away from the loop.
d. It indicates the magnetic field of the induced current opposes the change in flux.
what is the absolute pressure at a distance 5.00 m below the surface of a lake? assume the density of the water in the lake is 1000 kg/m3.
The absolute pressure at a depth of 5.00 m below the surface of a lake is 150.3 kPa.The absolute pressure is the sum of the atmospheric pressure and the hydrostatic pressure.
The atmospheric pressure at sea level is 101.3 kPa. The hydrostatic pressure is the pressure due to the weight of the water above the point of measurement.
The hydrostatic pressure can be calculated using the following equation:
P_h = ρgh
where:
P_h is the hydrostatic pressure (in Pa)
ρ is the density of the water (in kg/m³)
g is the acceleration due to gravity (in m/s²)
h is the depth below the surface of the water (in m)
In this case, the density of the water is 1000 kg/m³, the acceleration due to gravity is 9.81 m/s², and the depth is 5.00 m. So, the hydrostatic pressure is:
P_h = 1000 kg/m³ * 9.81 m/s² * 5.00 m
= 4905 Pa
The absolute pressure is then:
P_a = P_atm + P_h
= 101.3 kPa + 4905 Pa
= 150.3 kPa
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two 7493 counters, configured to count 0 to f, are connected so that the q3 output of one ic is wired to the cp0 clock input of the other ic. cp1 of each is fed from its q0 output. what is the modulus of the total circuit?
The total circuit will have a modulus of 256.
What is the total modulus of the circuit when two 7493 counters?The 7493 is a binary counter that can count from 0 to 15 in binary (or 0 to F in hexadecimal). When two 7493 counters are connected in this way, the Q3 output of the first counter is connected to the CP0 input of the second counter. This means that when the first counter reaches a count of 8 (1000 in binary), it will send a clock pulse to the second counter, causing it to count up by one. The CP1 input of each counter is connected to the Q0 output of the same counter, which means that the counters will count in a loop from 0 to F (or 15) and then back to 0. The modulus of the total circuit is the maximum count that it can reach, which is 16 in this case. Therefore, the modulus of the total circuit will be 256.
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which of the following statements is correct about what will happen to the boxes?multiple choicethey will both move with constant velocity.the right box will move with a constant velocity while the left box accelerates.the left box will move with a constant velocity while the right box accelerates.both boxes will accelerate.
The right box will move with a constant velocity while the left box accelerates.
Which of the following statements is correct?Hi! Based on the information given in your question, the correct statement about what will happen to the boxes is: the right box will move with a constant velocity while the left box accelerates.
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Green laser pointers emit light with a wavelength of 532 nm. Do research on the type of laser used in this type of pointer and describe its operation. Indicate whether the laser is pulsed or continuous.
Pulsed lasers are used in specific applications where short bursts of laser light are needed, such as in laser ranging, lidar, or certain medical procedures.
What is Wavelength?
Wavelength is a term used in physics to describe the distance between two consecutive points of a wave that are in phase, or the distance over which a wave completes one cycle. It is commonly denoted by the Greek letter lambda (λ) and is usually measured in units such as meters (m), nanometers (nm), or angstroms (Å).
Green laser pointers typically use a type of laser known as a diode-pumped solid-state (DPSS) laser to generate laser light at a wavelength of 532 nm, which corresponds to green light in the visible spectrum. DPSS lasers are a type of laser that uses a solid-state crystal or material as the gain medium, which is pumped by a diode laser to achieve laser emission.
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the current is uniformly distributed in a wire with a diameter of 9.76 mm. find the magnetic field magnitude
To find the magnetic field of a wire with a diameter of 9.76 mm and a uniformly distributed current, you'll need to know the current (I) flowing through the wire, and the distance (r) from the center of the wire to the point where you want to measure the magnetic field. You can use Ampere's Law to determine the magnetic field (B).
1. Convert the diameter of the wire to meters: 9.76 mm = 0.00976 m.
2. Calculate the wire's radius: radius = diameter / 2 = 0.00976 m / 2 = 0.00488 m.
3. Determine the current (I) flowing through the wire. This information should be provided in the problem.
4. Determine the distance (r) from the center of the wire to the point where you want to measure the magnetic field.
5. Use Ampere's Law to calculate the magnetic field (B): B = (μ₀ * I) / (2 * π * r), where μ₀ is the permeability of free space (μ₀ = 4π x 10⁻⁷ Tm/A).
6. Plug in the values of I, μ₀, and r into the equation and solve for B.
Once you have followed these steps with the appropriate values for I and r, you will have found the magnetic field at the desired distance from the wire's center.
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which type of spectrum contains dark bands that represent wavelengths intercepted by a material between a radiation source and the earth?
The type of spectrum being referred to is an absorption spectrum. Here are the steps involved in creating an absorption spectrum:
1) A radiation source emits a continuous spectrum of light, which contains all wavelengths of visible light.
2) The light from the radiation source passes through a material, such as a gas, liquid, or solid.
3) The material absorbs certain wavelengths of light that are specific to its chemical composition.
These absorbed wavelengths correspond to the energy levels of the electrons in the material's atoms or molecules.
4) The remaining light that passes through the material is a spectrum that has dark bands or lines where the absorbed wavelengths should be. These dark bands represent the wavelengths that were absorbed by the material.
5) The resulting spectrum is an absorption spectrum that can be used to identify the elements or compounds present in the material.
To summarize, an absorption spectrum contains dark bands that correspond to the specific wavelengths of light that are absorbed by a material between a radiation source and the earth. By analyzing the absorption spectrum, scientists can identify the composition of the material.
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an object isp laced in front of a converging lens with a focal length of 10 cm the pseicific location of the objectUse ray tracing to determine the location of the image and report the answer in two significant figures. Determine if the image is upright or inverted and if it is real or virtual
The image is formed 6.7 cm from the lens on the opposite side as the object and the top of the image is below the principal axis, the image is inverted.
To decide the area and qualities of the picture delivered by a uniting focal point with a central length of 10 cm, we can utilize beam following.
To begin with, draw a beam from the highest point of the item lined up with the important pivot of the focal point. This beam will go through the point of convergence on the opposite side of the focal point. Second, draw a beam from the highest point of the item through the focal point of the focal point, which won't be bowed. Finally, draw a beam from the highest point of the item towards the point of convergence of the focal point, which will be twisted and go through the point of convergence on a similar side of the focal point as the article.
The convergence of these three beams will decide the area of the picture. For this situation, the picture will be shaped on the contrary side of the focal point as the item and will be genuine.
Utilizing the focal point equation, 1/f = 1/do + 1/di, where f is the central length, do is the item distance, and di is the picture distance, we can decide the area of the picture. Since the article is set before the focal point, do is negative.
Accepting the item distance is - 20 cm, we can address for the picture distance:
1/10 = 1/ - 20 + 1/di
di = 6.7 cm
In this way, the picture is framed 6.7 cm from the focal point on the contrary side as the article. Since the highest point of the item is over the vital pivot and the highest point of the picture is underneath the main hub, the picture is upset.
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The picture is created 6.7 cm away from the lens on the side opposite the item, and because the image's top is below the main axis, it is inverted.
We can use beam following to determine the size and characteristics of the image that is delivered by a united focal point with a centre length of 10 cm.
Start by drawing a beam from the item's highest point that is aligned with the pivot point of the focal point. The point of convergence for this beam will be on the other side of the focal point. Second, draw a beam through the focal point of the object's focus point, which won't be bent, starting from its highest point. Finally, create a beam that will be twisted and pass through the point of convergence on the same side from the item's highest point towards its point of convergence.
The area of the picture will depend on where these three beams converge. In this instance, the image will be real and shaped on the opposite side of the object's focal point.
We can get the area of the picture by using the focal point equation, 1/f = 1/do + 1/di, where f is the centre length, do is the item distance, and di is the picture distance. Do is negative since the article is placed before the main focus.
Assuming the item is 20 cm away, we can address the picture distance as follows:
1/10 = 1/ - 20 + 1/di
di = 6.7 cm
In this method, the image is framed 6.7 cm away from the focus on the article's opposite side. The picture is messed up since the item's highest point is above the crucial pivot while the picture's highest point is below the main hub.
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early in the movie f-18 fighter jets are shown shooting many missiles at the alien spacecraft. these missiles then explode before hitting the spacecraft. captain steven hiller radios to his squadron that the ship must have some sort of protective shielding. is this scene possible? does our present state of technology have anything similar?
In our present state of technology, we don't have anything similar to the alien spacecraft's protective shielding. It's not a realistic representation of current technology.
The scene in which F-18 fighter jets shoot missiles at an alien spacecraft, only to have them explode before hitting the target, is certainly possible in a sci-fi movie.
However, The closest technology we have is electromagnetic shields used in science experiments and particle accelerators. These shields use a magnetic field to protect against charged particles, but they're not strong enough to withstand the impact of a missile.
Additionally, electromagnetic shields require a massive amount of energy, which isn't practical for use in military applications. Overall, while the scene may be entertaining in a movie,
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A boy wishes to make a catapult out of a rubber band of width 9mm and thickness 1.55mm. Determine the length of the band that must use so that when he stretches it by 0.25 of its natural length and releases it the velocity of a pebble of mass 0.006kg will be 30m\s. take the young modulus of the rubber to be 4×10^7 N\m^2
Answer:
To solve this problem, we can use the formula for the potential energy stored in a stretched spring or rubber band: U = (1/2) k x^2
where U is the potential energy, k is the spring constant, and x is the amount of stretch.
We can rearrange this formula to solve for k: k = 2 U / x^2
The velocity of the pebble can be found using conservation of energy:
(1/2) m v^2 = U
where m is the mass of the pebble and v is its velocity.
Rearranging this formula, we get: v = sqrt(2 U / m)
We can combine these formulas to solve for the length of the rubber band:
k = (4 U) / (0.25 L^2)
v = sqrt((8 U) / (0.006))
where L is the original length of the rubber band.
Since the width and thickness of the rubber band are given, we can calculate its cross-sectional area:
A = (9 mm) x (1.55 mm) = 13.95 mm^2 = 1.395 x 10^-5 m^2
Using the Young's modulus given in the problem, we can calculate the spring constant: k = (A / L) x (Y / 4)
where Y is the Young's modulus.
The formula for k above, we get: (4 A Y / L^3) x (U / 0.25) = 0.006 v^2
Solving for L, we get: L = (4 A Y U / 0.006 v^2)^1/3
Substituting the given values and solving, we get: L = 34.86 cm
Therefore, the length of the rubber band should be approximately 34.86 cm to achieve the desired velocity of the pebble
the first three standing waves patterns for a spring fixed at both ends is shown in the figure. if the frequency of the middle pattern is 72 hz, what is the exact frequency (in hz) of the first (top) pattern? do not include units with the answer.
The exact frequency of the first pattern is 12 Hz.
A standing wave on a spring fixed at both ends can be visualized as a series of oscillations where nodes, or points of no displacement, alternate with antinodes, or points of maximum displacement. The frequency of the standing wave is determined by the speed of the wave, which is dependent on the properties of the medium (in this case, the spring) and the distance between nodes.
The fundamental frequency (first harmonic) is twice the frequency of the second harmonic, which in turn is three times the frequency of the third harmonic. Thus:
f_3 = 72 Hz
f_2 = (1/3) f_3 = 24 Hz
f_1 = (1/2) f_2 = 12 Hz
Therefore, the exact frequency of the first pattern is 12 Hz.
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if the mass of an object is 10 what is its weight?
The effect in which white light separates into different colors is called
The effect in which white light separates into different colors is called dispersion, typically observed when light passes through a prism or water droplets.
Dispersion is the process by which white light is broken down into its individual colours. This phenomenon happens when light travels through a material that, depending on the light's wavelength, bends or refracts it at various angles.
This causes the white light to break up into a rainbow of colours when different colours of light bend at various angles. This effect may be seen in natural phenomena like rainbows and halo, but it is most frequently seen when light travels through a prism.
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how do we know what happens at the event horizon of a black hole? we don't know for sure: we only know what to expect based on the predictions of general relativity. astronomers have analyzed the light from matter within the event horizon of many black holes. physicists have created miniature black holes in the lab. astronomers have detected x-rays from accretion disks around black holes. astronomers have sent spacecraft through the event horizon of a nearby black hole
Our current understanding of the event horizons of a black hole is based on mathematical models, computer simulations, and indirect observations through telescopes.
How do we know what happens at the event horizon of a black hole?We know what happens at the event horizon of a black hole based on the predictions of general relativity. General relativity, a theory developed by Albert Einstein, helps us understand the behavior of massive objects like black holes. According to this theory, the event horizon is the boundary surrounding a black hole beyond which nothing, not even light, can escape its gravitational pull.
Astronomers have not directly observed the event horizon, but they have gathered evidence from the light emitted by matter close to black holes and the X-rays from accretion disks around them. Accretion disks are formed when matter, such as gas and dust, is drawn towards a black hole and heats up due to friction, emitting X-rays in the process. Observations of these X-rays help astronomers infer the properties of black holes and their event horizons.
It's important to note that physicists have not created miniature black holes in the lab, and no spacecraft has been sent through the event horizon of a nearby black hole. Our current understanding of event horizons is based on mathematical models, computer simulations, and indirect observations through telescopes.
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how many principle rays can you identify? describe each principle ray in a way that allows someone else, who has not seen the diagram but who has read your verbal description, to sketch each principle ray correctly from your description.
There are three principal rays that can be identified in a ray diagram: the ray parallel to the axis, the ray passing through the focal point and parallel to the axis, and the ray passing through the center of curvature.
The first principal ray is a ray that is parallel to the optical axis and passes through the lens. This ray will refract through the lens and pass through the focal point on the opposite side. To sketch this ray, draw a straight line that is parallel to the optical axis and intersects the lens. Then, draw the refracted ray that passes through the focal point on the opposite side.
The second principal ray is a ray that passes through the focal point on one side of the lens and then emerges from the lens parallel to the optical axis. To sketch this ray, draw a straight line that passes through the focal point on one side of the lens and intersects the lens. Then, draw the refracted ray that emerges from the lens parallel to the optical axis.
The third principal ray is a ray that passes through the center of curvature on one side of the lens and is reflected back along the same path. To sketch this ray, draw a straight line that passes through the center of curvature on one side of the lens and intersects the lens. Then, draw the reflected ray that passes back along the same path.
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catching a wave, a 73.2-kg surfer starts with a speed of 1.44 m/s, drops through a height of 1.84 m, and ends with a speed of 8.89 m/s. how much nonconservative work was done on the surfer?
The nonconservative work done on the surfer is 2845.5 J.
We can use the work-energy theorem to solve this problem. The work-energy theorem states that the net work done on an object is equal to its change in kinetic energy. In this case, we can calculate the initial and final kinetic energies of the surfer and find the difference, which will give us the net work done.
The initial kinetic energy of the surfer is:
[tex]K_i = (1/2) * m * v_i^2[/tex]
[tex]K_i = (1/2) * 73.2 kg * (1.44 m/s)^2[/tex]
K_i = 75.7 J
The final kinetic energy of the surfer is:
[tex]K_f = (1/2) * m * v_f^2[/tex]
[tex]K_f = (1/2) * 73.2 kg * (8.89 m/s)^2[/tex]
K_f = 2921.2 J
The change in kinetic energy is:
ΔK = K_f - K_i
ΔK = 2921.2 J - 75.7 J
ΔK = 2845.5 J
According to the work-energy theorem, this change in kinetic energy must be equal to the net work done on the surfer. Therefore, the nonconservative work done on the surfer is:
W_nc = ΔK
W_nc = 2845.5 J
So, the nonconservative work done on the surfer is 2845.5 J.
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What does freezing in the water cycle mean
Answer: Changing state from a liquid to a solid
Explanation: When liquid water loses thermal energy, it gets cold and undergoes freezing.
a local fm radio station broadcasts at a frequency of 94.8 mhz. calculate the wavelength at which it is broadcasting. wavelength
To calculate the wavelength at which the local FM radio station broadcasts at a frequency of 94.8 MHz, we'll use the formula:
Wavelength (λ) = Speed of Light (c) / Frequency (f)
Wavelength is a characteristic of waves that is defined as the distance between two consecutive points in a wave that are in phase with each other. In other words, it is the distance between two consecutive peaks or two consecutive troughs of a wave.
The speed of light (c) is approximately 3.00 x 10^8 meters per second (m/s), and the given frequency (f) is 94.8 MHz, which is equivalent to 94.8 x 10^6 Hz.
Step 1: Convert the frequency to Hz:
Frequency (f) = 94.8 MHz * 10^6 = 94.8 x 10^6 Hz
Step 2: Calculate the wavelength using the formula:
Wavelength (λ) = (3.00 x 10^8 m/s) / (94.8 x 10^6 Hz)
Step 3: Divide the numbers:
Wavelength (λ) ≈ 3.17 meters
The local FM radio station broadcasts at a wavelength of approximately 3.17 meters.
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We'll use the following formula to determine the wavelength at which the neighbourhood FM radio station transmits at a frequency of 94.8 MHz:
Wavelength () equals Frequency (f) / Lightspeed (c).
The distance between two successive wave points that are in phase with one another is known as the wavelength, which is a property of waves. In other terms, it is the space between two waves' successive peaks or troughs.
The specified frequency (f) is 94.8 MHz, which is equal to 94.8 x 106 Hz, and the speed of light (c) is roughly 3.00 x 108 metres per second (m/s).
First, change the frequency to Hertz (Hz):
f = 94.8 MHz * 106 = 94.8 x 106 Hz
2. Determine the wavelength with the following formula:
Wavelength () is calculated as (3.00 x 108 m/s) / (94.8 x 106 Hz).
3. Divide the figures:
The wave length is 3.17 metres.
The wavelength used by the neighbourhood FM radio station is roughly 3.17 metres.
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T/F: Science proceeds by presuming that observed patterns in nature cab be attributed to an underlying physical explanation.
What is the tension on a rope allowing a 7.50 kg box to accelerate downward at 4.00 m/s2?
43.5N
5.8N
13.8N
104N
The tension on the rope allowing the box to accelerate downward at 4.00 m/s² is 43.5 N.
To find the tension on the rope, we need to use the equation for the net force acting on the box:
F_net = ma
where F_net is the net force, m is the mass of the box, and a is the acceleration of the box. The box is accelerating downward at 4.00 m/s², so we can substitute in the values:
F_net = (7.50 kg)(4.00 m/s²) = 30.0 N
The tension on the rope is equal in magnitude but opposite in direction to the weight of the box. We can find the weight of the box using the equation:
F_weight = mg
where F_weight is the weight, m is the mass of the box, and g is the acceleration due to gravity (9.81 m/s²).
F_weight = (7.50 kg)(9.81 m/s²) = 73.6 N
Therefore, the tension on the rope is:
Tension = F_weight - F_net = 73.6 N - 30.0 N = 43.6 N
So, the tension on the rope allowing the box to accelerate downward at 4.00 m/s² is 43.5 N.
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in an rc circuit what teh range of c needed for the capacitor to be 99.3% charged within 10 ms of turning the voltage source on ?
The range of capacitance needed for the capacitor to be 99.3% charged within 10 ms of turning the voltage source on is greater than or equal to 56.3 times the resistance in ohms.
To calculate the range of capacitance needed for the capacitor to be 99.3% charged within 10 ms of turning the voltage source on in an RC circuit, we can use the following formula:
Vc(t) = Vmax * (1 - e^(-t/RC))
where Vc(t) is the voltage across the capacitor at time t, Vmax is the maximum voltage of the source, e is the mathematical constant approximately equal to 2.718, R is the resistance in ohms, C is the capacitance in farads, and t is the time in seconds.
When the capacitor is 99.3% charged, the voltage across it is 0.993 * Vmax. Substituting this value into the formula and solving for C, we get:
C >= t / (R * ln(1 / (1 - 0.993)))
C >= 10 ms / (R * ln(1 / 0.007))
C >= 56.3 * R
Therefore, the range of capacitance needed for the capacitor to be 99.3% charged within 10 ms of turning the voltage source on is greater than or equal to 56.3 times the resistance in ohms.
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the crankshaft in a race car goes from rest to 3600 rpm rpm in 2.8 s.
What is the crankshaft's angular acceleration?
How many revolutions does it make while reaching 3600 rpm?
The angular acceleration of the crankshaft can be found using the formula:
angular acceleration = (final angular velocity - initial angular velocity) / time
The initial angular velocity is 0 since the crankshaft starts from rest. The final angular velocity can be found by converting 3600 rpm to radians per second:
final angular velocity = (3600 rpm) x (2π radians/1 revolution) x (1 min/60 s) = 377 radians/s
Plugging in the values, we get:
angular acceleration = (377 radians/s - 0 radians/s) / 2.8 s = 134.6 radians/s^2
Therefore, the angular acceleration of the crankshaft is 134.6 radians/s^2.
To find the number of revolutions the crankshaft makes while reaching 3600 rpm, we can use the formula:
number of revolutions = final angular velocity / (2π radians/1 revolution)
Plugging in the values, we get:
number of revolutions = 377 radians/s / (2π radians/1 revolution) = 59.9 revolutions
Therefore, the crankshaft makes approximately 59.9 revolutions while reaching 3600 rpm.
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a laser beam takes 45.5 ms to be reflected back from a totally reflecting sail on a spacecraft. how far away is the sail?
The sail is approximately 6,832,500 meters away from the laser source.
To determine the distance between the laser source and the totally reflecting sail on a spacecraft, we'll use the time it takes for the laser beam to be reflected back, which is 45.5 ms (milliseconds).
Since the laser beam travels to the sail and back, we must account for the round trip. The speed of light is approximately 3.0 x 10^8 meters per second (m/s).
First, convert 45.5 ms to seconds: 45.5 ms × (1 s / 1000 ms) = 0.0455 s.
Next, calculate the total distance the laser beam travels during this time: distance = speed × time, so distance = (3.0 x 10^8 m/s) × 0.0455 s ≈ 13,665,000 meters.
Finally, divide the total distance by 2 to find the distance between the laser source and the sail: 13,665,000 meters / 2 ≈ 6,832,500 meters.
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Where do I place the right ones
Cause: Human population grows worldwide.
Effect: Fossil fuels burn, cities become more industrialized, glaciers melt, climates change, and rain falls in unusual amounts.
What is global warming?Global warming refers to the long-term increase in Earth's average surface temperature, primarily due to the increasing levels of greenhouse gases, such as carbon dioxide, in the atmosphere. These gases trap heat from the sun, preventing it from radiating back into space and causing the Earth's temperature to rise.
Global warming has a range of potential impacts, including rising sea levels, more frequent and severe heat waves, changes in precipitation patterns, and more intense storms. It is considered one of the most significant and pressing environmental challenges facing the planet today.
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if it took 0.460 s for the drive to make its second complete revolution, how long did it take to make the first complete revolution?
To find the time it took for the drive to make its first complete revolution, we need to use the fact that the time for two complete revolutions is 0.460 s.
We start by using the formula for period (T), which is the time for one complete revolution:
T = t/n
where t is the time for n revolutions.
We know that it took 0.460 s for two complete revolutions, so we can substitute these values into the formula:
T = 0.460 s / 2
T = 0.230 s
This tells us the time for one-half revolution.
To find the time for one complete revolution, we multiply the time for one-half revolution by 2:
T = 0.230 s x 2
T = 0.460 s
Therefore, it took 0.460 s for the drive to make its first complete revolution.
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a steel wire and an aluminum wire of the same length l and diameter d are joined to form a wire of length 2l. the wire is fastened to the ceiling and a mass m is attached to the other end. if the masses of the wires are negligible relative to mass m, the ratio of the stress in the aluminum wire to the stress in the steel wire is
The aluminum wire and steel wire share the stress ratio equal to 1.
It is equal to 1 because both wires are of the same diameter and are joined with each other. The tension force F applied to both ends are same so they experience the same amount of stress which is σ = F/A.
here,
A = πd²2/4 is considered as the cross-sectional area of each wire.
Stress refers to the physical quantity which measures the internal force which is acting upon an object per unit area. It can be tensile or compressive depending upon the decision of elongating it shortening it.
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The complete question is
A steel wire and an aluminum wire of the same length L and diameter d are joined to form a wire of length 2L. The wire is fastened to the ceiling and a mass m is attached to the other end. If the masses of the wires are negligible relative to mass m, the ratio of the stress in the aluminum wire to the stress in the steel wire is
a) greater than 1.
b) dependent on mass m.
c) equal to 1.
d) Impossible to determine.
e) less than 1.
1. How has technology affected the news media?
Technology has a significant impact on the news media in many ways such as: (1) Speed (2) Reach (3) Diversity of sources (4) Competition (5) Bias and misinformation.
How technology has significantly impacted the news media?(1) Speed: With the advent of the internet and social media, news can be disseminated and consumed faster than ever before. News organizations must work quickly to keep up with the 24/7 news cycle, and readers and viewers expect to receive updates in real-time.
(2) Reach: Technology has enabled news organizations to reach a much wider audience than was previously possible. With the internet and social media, news can be accessed by people all over the world, regardless of their location.
(3) Diversity of sources: The internet has made it easier for news consumers to access a variety of sources, including alternative and independent media. This has given rise to a more diverse media landscape, which can be both positive and negative.
(4) Competition: The proliferation of news sources has also increased competition in the media industry. Traditional news organizations are now competing with a vast array of online news sources, which can make it difficult to stand out.
(5) Bias and misinformation: The ease with which information can be shared on the internet has also led to an increase in biased or outright false information being shared as "news". This can make it difficult for consumers to determine what is true and what is not.
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the magnitude of b⃗ b→b_vec increases while its direction remains unchanged, how will the magnetic flux through the coil change?
An increase in the magnitude of the magnetic field vector B, while its direction remains unchanged, will affect the magnetic flux through a coil:
1) Magnetic field: The magnetic field is a vector quantity that describes the strength and direction of the magnetic force. It is denoted by the symbol B.
2) Magnetic flux: Magnetic flux is a scalar quantity that measures the amount of magnetic field passing through a given area. It is denoted by the symbol Φ.
3) Faraday's law: According to Faraday's law of electromagnetic induction, the induced electromotive force (EMF) in a coil is proportional to the rate of change of magnetic flux passing through it.
4) Magnetic field and flux: The magnetic flux through a coil is directly proportional to the strength of the magnetic field passing through it.
If the magnitude of the magnetic field vector B increases while its direction remains unchanged, the magnetic flux passing through the coil will also increase.
5) Rate of change of flux: An increase in the magnetic field strength will result in a greater rate of change of magnetic flux passing through the coil.
This, in turn, will result in a greater induced EMF according to Faraday's law.
6) Increase in magnetic flux: Since the induced EMF is proportional to the rate of change of magnetic flux, an increase in the magnetic field strength will lead to an increase in the magnetic flux passing through the coil.
This will result in a greater induced EMF, which can lead to an electric current flowing in the coil.
In summary, an increase in the magnitude of the magnetic field vector B, while its direction remains unchanged, will lead to an increase in the magnetic flux passing through the coil, according to Faraday's law of electromagnetic induction.
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