a public address system puts out 9.47 w of power. what will be the intensity at a distance that results in a surface area of 5.92 m^2?
Answers
The intensity of the public address system at a distance that results in a surface area of 5.92 m^2 will be 1.60 W/m^2.
Intensity is the power per unit area, and in this case, the power output of the public address system is 9.47 W. To find the intensity at a specific distance, we need to calculate the surface area that the sound waves will spread over at that distance.
Using the formula for the surface area of a sphere, we can calculate the surface area as:
Surface area = 4πr^2
where r is the distance from the source. We can rearrange this formula to solve for r:
r = √(surface area / 4π)
Plugging in the given surface area of 5.92 m^2, we get:
r = √(5.92 / 4π) = 0.686 m
Now that we know the distance, we can calculate the intensity using the power output of the public address system:
Intensity = power / surface area = 9.47 W / (4π × 0.686^2) = 1.60 W/m^2
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Related Questions
which nonmetal family is the most reactive on the periodic table
Answers
In non-metals halogen family (group 17th) is highly reactive as it the most electronegative family and can gain electron easily to complete its octet.
The change in frequency of a wave as its source moves in relation to an observer.
A)
Ultrasound
B)
Frequency
C)
Doppler Effect
D)
Echo
Answers
Answer: B) Frequency
Explanation:
according to the nebular theory for the formation of the solar system, a. no prediction is made as to the directions of rotations of the planets b. planets can be rotating in any random direction compared to the direction they orbit the sun c. planets should be rotating in the opposite direction to the direction they orbit the sun d. planets should be rotating in the same direction as they orbit the sun
Answers
The nebular theory proposes that a rotating cloud of dust composed primarily of light elements collapsed into a protoplanetary disc and eventually developed into a solar system with a star and planets in orbit.
What are the nebular theory's stages in the order that they occur?These are the steps in nebular theory. When part of the dust and gas cloud condenses into the a core and becomes a protostar, the nebula changes into a solar nebula. The material condensing could have been brought on by a distant supernova shockwave. An accretion disc is formed as the protostar's surrounding material disintegrates.
Does the nebular hypothesis describe how a planet's rotation occurs?The nebular theories explain three observable facts about our solar system. The planets all revolve in the same direction, which is the first factor. The third is that all of them orbit a same plane within six degrees of one another.
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what is ionisation?
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Answer: Ionisation is the process of an atom gets a negative or a positive charge by gaining or losing electrons. The result is an ion.
Explanation: Thats why
15 POINTS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answers
The scientist would look out for patterns and connections. Option D
What is data?We define data as a set of facts that we can obtain from a study. We know that scientists are always engages in some kind of study and the reason for the study is that they want to obtain the reasons for certain occurrence.
It is common that when we present a professional scientist with a data set, what first comes to mind is that we need to find the patterns that are in the data set as well as the connections.
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A 25 W fluorescent light bulb emits 5.0 J of thermal energy each second. What is the efficiency of the fluorescent light? I just want an explanation.
Answers
Answer:
80%
Explanation:
1. Martha bought a six pack of soda on Thursday. She promised her neighbor, Mr. Jimmy, that she would save the cans for him. What are they doing to help our ecosystem?
Answers
Answer:
They are helping the ecosystem
Explanation:
They are helping the ecosystem by making sure those cans are going to be either
a) recycled properly
b) up-cycled for a project of some sorts
A boat is pulled into a dock by means of a winch 20 feet above the deck of the boat. If the boat is moving toward the dock at 2 feet per second, when there is 25 feet of rope out, what is the rate at which the winch is pulling in the rope at this instant? A) -2.5 B) 1.5 C) -1.8
D) 1.2 E) 3.1 F) 2.4
Answers
A boat is pulled into a dock by means of a winch 20 feet above the deck of the boat. If the boat is moving toward the dock at 2 feet per second, when there is 25 feet of rope out. The rate at which the winch is pulling in the rope at this instant is 25 feet per second.
The correct answer is option G.
To solve this problem, we can use the concept of related rates. Let's denote the length of the rope as "r" and the distance between the boat and the dock as "d". We are given that the boat is moving towards the dock at a rate of 2 feet per second.
We need to find the rate at which the winch is pulling in the rope, which can be represented by the derivative dr/dt.
Using the Pythagorean theorem, we can relate the variables "r" and "d":
\(d^2 = r^2 + h^2\)
where h is the height of the winch above the deck of the boat. In this case, h is given as 20 feet.
Differentiating both sides of the equation with respect to time t, we get:
2d * dd/dt = 2r * dr/dt
Simplifying the equation, we have:
dd/dt = (r/dr) * (dr/dt)
We are given that when there is 25 feet of rope out (r = 25), the boat is moving towards the dock at a rate of 2 feet per second (dr/dt = -2).
Substituting these values into the equation, we have:
dd/dt = (25/-2) * (-2) = 25 feet per second
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The question probable may be:
A boat is pulled into a dock by means of a winch 20 feet above the deck of the boat. If the boat is moving toward the dock at 2 feet per second, when there is 25 feet of rope out, what is the rate at which the winch is pulling in the rope at this instant?
A) -2.5
B) 1.5
C) -1.8
D) 1.2
E) 3.1
F) 2.4
G) 25
Filiberto va a 90m/s en su carri, de repente se distrae por un par de segundos y su velocdad pasa a 40 m/s ¿cual fue su aceleracion de su movimientonto
Answers
Answer:
Filiberto experimenta una deceleración de \(2\,\frac{m}{s^{2}}\).
Explanation:
(The problem was written in Spanish. Hence, explanation will be held in Spanish).
Asúmase que Filiberto se distrae por 2 segundos, puesto que un par equivale a dos, y que el vehículo experimenta un aceleración constante. La deceleración experimentada por el vehículo se deriva de la siguiente fórmula:
\(a = \frac{v-v_{o}}{\Delta t}\)
\(a = \frac{40\,\frac{m}{s}-90\,\frac{m}{s} }{2\,s}\)
\(a = -25\,\frac{m}{s^{2}}\)
Filiberto experimenta una deceleración de \(2\,\frac{m}{s^{2}}\).
Guys please help. This is urgent!
Q1) An immersion heater is put into some crushed ice at 0°C. The immersion heater is switched on.
On Fig 5.2, sketch the graph of temperature against time, up to the time when all the ice has melted.
NOTE: the dotted line on the graph is the time when all the ice has melted.
Answers
An immigration heater is put into some crushed ice at 0C. The immersion heater is switched on
When comparing solids to fluids, the following is true:_________
a. For elastic solids, stress is linearly related to strain rate, for non-Newtonian fluids, stress is
b. For elastic solids, stress is linearly related to strain, for non-Newtonian fluids, stress is
c. For elastic solids, the stress must be normal. For non-Newtonian fluids, the stress must
d. For elastic solids, the stress must be shear. For non-Newtonian fluids, the stress must be non-linearly related to strain. non-linearly related to strain rate. be shear normal.
Answers
When comparing solids to fluids, the following is true: For elastic solids, stress is linearly related to strain, for non-Newtonian fluids, stress is non-linearly related to strain rate.
In the mechanical sense, solids and fluids are differentiated based on their reaction to applied stresses. Solids can resist external forces of tension, compression, and torsion, and fluids deform continuously under the same conditions.Stress is a measure of how much force is applied to a specific area, while strain is the resulting deformation that occurs under stress. Elastic solids have the property of returning to their original shape when the stress is removed. A solid's behavior under stress is determined by its modulus of elasticity, which determines the linear relationship between stress and strain. A non-Newtonian fluid is a fluid that exhibits non-Newtonian behavior, in which the stress is non-linearly related to strain rate.
Stress is linearly related to strain in elastic solids, while stress is non-linearly related to strain rate in non-Newtonian fluids.
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(a) A roller-coaster car has a total mass (including passengers) of 505 kg. Sitting in the car is a passenger with a mass of 52.0 kg. The car reaches the lowest point of a circular arc in the track, point A in the figure below, moving at a speed of 14.0 m/s. The radius of the arc is r, = 24.0 m. What is the magnitude (in N) and direction of the force that the seat exerts on the passenger at point A? magnitude direction Select-- v (b) What If? If the car has the same speed at point A as in part (a), what would the radius (in m) of the track have to be for the force of the seat on the passenger at this point to be three times the passenger's weight?
Answers
The force of the seat on the passenger is 7.33 N and its direction is inward toward the center of the arc. The radius of the track would have to be = 3,55 m.
At point A, the roller-coaster car has a total mass of 505 kg, including the passenger with a mass of 52.0 kg. The car is travelling at a speed of 14.0 m/s and the radius of the arc is 24.0 m. The force that the seat exerts on the passenger can be calculated using the formula F = mv2/r, where m is the mass of the passenger, v is the speed of the car, and r is the radius of the arc.
In this case, F = (52.0 kg)(14.0 m/s2) / 24.0 m = 7.33 N. The force of the seat on the passenger is 7.33 N, and its direction is inward toward the center of the arc.
For the force of the seat on the passenger at point A to be three times the passenger's weight (3 x 52.0 kg = 156.0 kg), the radius of the track would have to be r = (52.0 kg)(14.0 m/s2) / 156.0 kg = 3.55 m.
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(A)Heat flow(B)Kinetic energy(C)Potential energy(D)First law of thermodynamics(E)Second law of thermodynamicsThe amount of energy in an isolated system stays constant.ABCDE
Answers
How did issac newton show that white light consist of all the colors of the rainbow
Answers
What is the direction of a vector with an x component of -12 m and a y component of 21 m?
Answers
Answer:
\(Direction= 119.74^\circ\)
Explanation:
Displacement Vector
The displacement, as every vector, has a magnitude r and a direction angle θ measured from the positive x-axis.
If we know the x-y components of the displacement, the magnitude and angle can be calculated by the equations:
\(r=\sqrt{x^2+y^2}\)
\(\displaystyle \tan\theta=\frac{y}{x}\)
The coordinates of the given vector are x=-12 m, y=21 m, thus:
\(\displaystyle \tan\theta=\frac{21}{-12}=-1.75\)
\(\theta=tan^{-1}(-1.75)=-60.26^\circ\)
Since the vector lies in the second quadrant, we add 180° to find the correct direction:
\(\boxed{Direction=-60.26^\circ+180^\circ= 119.74^\circ}\)
Why is climate change important?
PLEASE HELP! GIVING BRAINLIEST!
Answers
Answer:
Because if we do nothing the artic will melt, ocean levels will rise and cause flooding, the earth will be extremely hotter, there will be more blackouts.
Explanation:
In order to show evidence of the role of a fuse, we construct the circuit of the adjacent figure. This circuit includes in series : - a generator (G) delivering across its terminals a constant voltage UPN = U = 24 V. - P two identical lamps (L₁) and (L₂) considered as resistors, carrying the indications (12 V; 0.6 A). 3) The lamp (L₂) is short circuited a) Give the value of the voltage U₂ across the terminals of (L2). Justify. b) Deduce the value of the voltage U₁ across the terminals of (L₁) and the value of the current I' through the circuit. c) (L₁) may burn out. Why? d) In fact (L₁) does not burn out but it will be off. Explain.
Answers
U₂ = 0 V. The lamp (L₂) is short circuited, meaning that there is no resistance between its terminals. As such, the voltage across its terminals must be zero.
What is resistance?Resistance is a concept in physics that measures the opposition to the flow of electric current, heat, light, sound, or any other form of energy or matter. It is the measure of how much an object, material, or system resists the flow of electric current, heat, light, sound, or any other form of energy or matter.
a) U₂ = 0 V. The lamp (L₂) is short circuited, meaning that there is no resistance between its terminals. As such, the voltage across its terminals must be zero.
b) U₁ = 12 V. Since the generator is providing a constant voltage of 24 V across its terminals, the voltage across the terminals of (L₁) will be half of this, i.e. 12 V. As the lamps are identical, the current I' through the circuit will also be 0.6 A.
c) (L₁) may burn out due to the large amount of current it is carrying. If the current is too high, it may exceed the rated capacity of the lamp and lead to its failure.
d) (L₁) does not burn out because the circuit includes a fuse. The fuse is designed to break the circuit in the event of an excessive current, thus protecting the lamp from burning out. When the fuse blows, the circuit is broken and the lamp will be off.
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Is there static friction on anything that is not moving?
Or, is there static friction present ONLY when there is something trying to get something else to move, but it not moving?
Answers
The friction force is static since there is no relative motion between the shoe and the ground. The friction force, if any, is the static force of friction if there is no relative motion between the objects in contact (FS). An illustration would be a box that sits motionless on a ramp.
What is static friction?A force that holds an object at rest is called static friction. The following is a definition of static friction:
the resistance people feel when they try to move something that is stationary on a surface without actually moving their bodies or the surface they are trying to move it on.
It can be explained as the frictional force that perfectly balances the applied force throughout the body's stationary state.
The static frictional force is self-regulating, meaning that it will always be equal to and the opposite of the applied force.
Friction is the force that prevents an object from moving in the direction it is sliding along a surface, therefore it acts in the opposite direction. But a friction force can be felt even when an object is not moving.
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yea one sec, it’s asking to find the element with the following ionization energies ie1:0.8 ie2:2.43 ie3:3.66 ie4:25.02 ie5:32.82
Answers
The element is likely to be in the p-block of the periodic table, since elements in this block typically have a low first ionization energy and high subsequent ionization energies. The element with these ionization energies is Nitrogen (N), which has the electron configuration 1s2 2s2 2p3.
The ionization energy of an element is the energy required to remove an electron from a neutral atom of that element. The given ionization energies are:- ie1: 0.8, ie2: 2.43, ie3: 3.66.ie4: 25.02,ie5: 32.82.
To find the element with these ionization energies, we can use the periodic table and look for elements with similar ionization energy values.
In general, as we move across a period from left to right, the ionization energy of the elements increases due to the increasing nuclear charge.
Similarly, as we move down a group, the ionization energy of the elements decreases due to the increasing distance of the outermost electrons from the nucleus.
Based on the given ionization energies, we can identify the element as follows:
- The first ionization energy (ie1) is relatively low, suggesting that the outermost electron is not strongly bound to the nucleus.
- The second ionization energy (ie2) is significantly higher than the first, indicating that the removal of a second electron requires much more energy.
- The third ionization energy (ie3) is higher than the second, suggesting that the second electron was removed from a more stable configuration.
- The fourth ionization energy (ie4) is much higher than the third, indicating that the third electron was removed from a very stable configuration.
- The fifth ionization energy (ie5) is higher than the fourth, suggesting that the removal of a fifth electron requires even more energy.
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When they talk about the Copernican Principle, philosophers and astronomers mean the idea that everything in the universe rotates and revolves (ie has angular momentum), the idea that Copernicus was the greatest astronomer who ever lived and the model for astronomers ever since. the idea that the universe is expanding in every direction that we look. the idea that everything in the universe revolves around the Sun, the idea that there is nothing special about our place in the universe.
Answers
The Copernican Principle refers to the idea that there is nothing special about our place in the universe, and that everything in the universe revolves around the Sun, challenging the geocentric model.
The Copernican Principle is a foundational concept in astronomy and cosmology. It challenges the geocentric view by asserting that there is nothing special about our place in the universe. It proposes that everything in the universe, including celestial bodies and systems, revolves around the Sun. This heliocentric model, pioneered by Nicolaus Copernicus, marked a significant shift in our understanding of the cosmos. It introduced the idea that the Earth is not the center of the universe but rather a planet in orbit around the Sun. The Copernican Principle has since shaped our perception of the vastness and diversity of the cosmos, challenging previous geocentric beliefs.
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The atmospheric pressure on a mountain is 550 mmHg and 1 atm is equal to 760 mmHg. What is the pressure in atm? Give your answer to 2 significant figures760 mmHg what is the pressure in atm?
Answers
Answer:
0.72 atm
Explanation:
Given that the atmospheric pressure on a mountain is 550 mmHg.
Where 1 atm is equal to 760 mmHg.
To Convert millimetre mercury (mmHg) into atmospheric pressure units (atm) , divide the magnitude of pressure by 760. That is,
Pressure = 550/760
Pressure = 0.724 atm
Therefore, pressure in atm is 0.72 atm in two significant figures
Observe the golfer ball shown in the image.
(time, t=7.50 s time from when the ball is hit to the max height.)
If this is the time for the ball to reach its max height, what is the total hang time (from the time the ball is hit to the max height to when the ball hits the ground). (Assume no air resistance or spin.)
Answers
Answer:
If the time to reach max height is 7.5 s then the time to fall to the ground would be 7.5 s and the total time of flight would be 15 s.
Vy / g = tup Vy is initial vertical speed
Vf / g = tdown Vf is the final vertical speed
Speed (vertical) at end of trajectory must the the same as the speed at the start of the trajectory for energy to be conserved.
The total hang time (from the time the ball is hit to the max height to when the ball hits the ground) would be 15 seconds.
What is a projectile motion?It can be defined as the motion of any object or body when thrown from the earth's surface and follows any curved path under the effect of the gravitational force of the earth.
As given in the problem the golfer ball is shown in the image.
(time, t=7.50 s time from when the ball is hit to the max height.
The total hang time of the projectile is twice the time taken it to attain the maximum height
The total hang time of the projectile = 2 ×7.5 seconds
= 15 seconds
Thus, the total hang time of the golf ball would be 15 seconds.
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A 1,725 kg car accelerates from 3.0 m/s for 4.4 s and reaches a velocity of 12.0 m/s. Ignoring friction, what is the applied force from the engine?
Answers
Given:
The mass of the car is m = 1725 kg
The initial velocity of the car is
\(v_i=\text{ 3 m/s}\)The final velocity of the car is
\(v_f=\text{ 12 m/s}\)The time is t = 4.4 s
To find the applied force.
Explanation:
The force can be calculated by the formula
\(F=\text{ ma}\)Here, a is the acceleration.
The acceleration can be calculated as
\(\begin{gathered} a=\frac{v_f-v_i}{t} \\ =\frac{12-3}{4.4} \\ =2.045\text{ m/s}^2 \end{gathered}\)On substituting the values, the force applied will be
\(\begin{gathered} F=ma \\ =1725\times2.045 \\ =3527.625\text{ N} \end{gathered}\)Thus, the applied force is 3527.625 N
an approaching subway train produces a 100 db sound, and a normal conversation is about 60 db. what is the intensity ratio of these two sounds?
Answers
The intensity of the approaching subway train sound is 10,000 times greater than the intensity of a normal conversation.
To determine the intensity ratio of the two sounds, we need to use the formula:
Intensity ratio = 10^(difference in decibels/10)
The difference in decibels between the approaching subway train (100 dB) and a normal conversation (60 dB) is 40 dB.
So, the intensity ratio of the two sounds would be:
Intensity ratio = 10^(40/10)
Intensity ratio = 10^4
It is important to note that decibels are a logarithmic unit of measurement, which means that each increase in 10 decibels corresponds to a 10-fold increase in sound intensity. Therefore, a 100 dB sound is not simply twice as loud as a 50 dB sound but rather 10,000 times louder. The intensity ratio formula can be used to compare different sounds and determine their relative loudness levels. In this case, the intensity ratio of the approaching subway train sound to a normal conversation is 10,000:1, which demonstrates the significant difference in sound intensity between these two scenarios.
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A pole 10 m long lies on the ground next to a barn that is 8 m long. AN athlete picks up the pole, carries it far away and then runs with it towards the barn at speed 0.8c. The athlete's friend remains at rest, standing by the open door of the barn.
Answers
Answer:
okay
Explanation:
but what is the question here?
How much pressure is exerted by a force of 600 n applied vertically over a 20 m2 area?
Answers
The pressure exerted by a force of 600 N applied vertically over a 20 m² area is 30 Pa.
The formula to calculate pressure is given by:
Pressure = Force/Area
Pressure is the force per unit area. Its unit is pascals (Pa) or newtons per square meter (N/m2).
How much pressure is exerted by a force of 600 N applied vertically over a 20 m2 area?
SolutionGiven, Force = 600 NArea = 20 m2Using the formula, we can calculate the pressure exerted:
Pressure = Force/AreaPressure = 600 N / 20 m2Pressure = 30 Pa
Therefore, the pressure exerted by a force of 600 N applied vertically over a 20 m2 area is 30 Pa.Answer:30 Pa.
Pressure = Force/AreaGiven Force
= 600 NArea
= 20 m² Pressure
= 600 N / 20 m²
= 30 Pa.
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What kind of force does the magnet use move the nail
friction
push
pull
gravity
Answers
Pls help...what is the answer?
Answers
Answer:
35 kilogram per stair will weight
Emily is riding her bike at a velocity of 10m/s and a cat runs in front of her causing her to slam the brakes and stop. What was her acceleration?
Answers
To determine Emily's acceleration when she slams the brakes and stops her bike, we can use the formula for acceleration:
acceleration (a) = (final velocity - initial velocity) / time
In this case, Emily's initial velocity is 10 m/s, and she comes to a stop, so her final velocity is 0 m/s. However, we don't have information about the time it takes for her to stop. Without the time, it is not possible to calculate the exact value of acceleration.
Acceleration is a measure of how quickly an object's velocity changes. When Emily applies the brakes, she experiences negative acceleration (deceleration) because her velocity decreases in the opposite direction of her motion. The magnitude of the acceleration depends on how quickly she stops and the time it takes for her to do so.
If we assume that Emily comes to a stop almost instantaneously (in a very short time), then the acceleration would be very large. However, in real-world scenarios, braking takes some time, and the acceleration would depend on various factors such as the braking force, the friction between the bike tires and the ground, and the mass of the bike and rider.
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Given a parallel runtime of 20s on eight cores and a serial runtime of 80s, what is the runtime in seconds on 16 cores assuming the same efficiency (do not include any units in the answer)?
Answers
If we assume the same efficiency, then we can use Amdahl's Law to calculate the new runtime on 16 cores.
Amdahl's Law states that the speedup of a parallel program is limited by the portion of the program that must be executed sequentially. In this case, the portion that must be executed sequentially is (80-20)/80 = 0.75 or 75%. This means that only 25% of the program can be parallelized. Therefore, the speedup we can expect from doubling the number of cores is limited to 1/((1-0.25) + 0.25/8) = 1.85.
Using this speedup, we can calculate the new runtime on 16 cores as 20/1.85 = 10.81 seconds.
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