a loudspeaker emits a spherical wave with 50.0 w of sound power. what is the intensity of of this wavefront at a distance of 1.5 m from the source?
Answers
A loudspeaker emits a spherical wave with 50.0 w of sound power, the intensity of the spherical wavefront at a distance of 1.5 m from the source is 1.48 W/m².
The intensity of the spherical wavefront at a distance of 1.5 m from the source can be calculated as follows: Given, Sound power emitted by loudspeaker = 50.0 W, Distance from the source = 1.5 m
We know that the intensity of a spherical wave is given by the formula: I = P / (4πr²) Where I = Intensity of the spherical wavefront P = Power of the sound source and r = Distance from the source
Substituting the given values in the above formula, we get: I = 50 / (4π × 1.5²)I = 1.48 W/m²
Therefore, the intensity of the spherical wavefront at a distance of 1.5 m from the source is 1.48 W/m².
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Related Questions
A body at rest is given an initial uniform acceleration of 8m/s2 for 30s after which the acceleration is reduced to 5m/s2 for the next twenty seconds. The body maintains the speed attained for 60s, after which it is brought to rest in 20s.
Answers
Explanation:
v=u+at, where v,u,a and t are the final velocity, initial velocity, acceleration and time, respectively.
For t=0 s to t=30 s , a =8 m/s 2.
For t=30 s to t=50 s , a = 5 m/s 2.
For t=50 s to t=110 s , a = 0 m/s 2.
For t=110 s to t=130 s , a is such that the body comes to rest at the end of this period.
For t=0 s to t=30 s ,v=0+8t⇒v=8t m/s.
At t=30s,v=8×30=240 m/s.
For t=30 s to t=50 s ,v=240+5(t−30)⇒v=90+5t m/s
At t=50s,v=90+5×50=340 m/s.
For t=50 s to t=110 s ,v=340 m/s.
For t=110 s to t=130 s ,v=340+a(t−110).
The body comes to a halt at t=130 s ⇒0=340+a(130−110).
0=340+20a⇒a=−34020=−17 m/s2.
For t=110 s to t=130 s ,v=340−17(t−110)=2210−17t m/s.
The tilt of Earth's axis causes different seasons. Winter and summer depend on the earth being tilted toward or away from the sun. Earth’s axial tilt fluctuates in a cycle of
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Seasons are caused by the tilt of the Earth's axis. Winter and summer are determined by the tilt of the earth towards or away from the sun. The Earth's axial tilt changes every 41,000 years.
Earth's axial tilt is the angle between the Earth's rotational axis and the plane of its orbit around the sun. The current tilt of the Earth's axis is about 23.5 degrees relative to the plane of its orbit. This tilt is responsible for the changing seasons as the Earth orbits the sun.
The axial tilt of the Earth is not constant but changes over a cycle of about 41,000 years. This cycle is known as the obliquity cycle and is caused by gravitational interactions between the Earth and other celestial bodies such as the Moon and Jupiter.
During this cycle, the tilt of the Earth's axis varies between 22.1 and 24.5 degrees, which results in a change in the amount of solar radiation received at different latitudes. This, in turn, affects the distribution of heat on the Earth's surface and influences the climate.
The effect of this cycle on the climate is relatively small compared to other factors such as greenhouse gases and ocean currents. However, it is believed to have played a role in past climate changes, including the ice ages.
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Speeds in Different Mediums:
If you pull on one end of a coiled spring toy, does the pulse reach the other end instantaneously? What happens if you pull on a rope? What happens if you hit the end of a metal rod? Compare the pulses traveling through these three materials.
Answers
Comparing the pulses traveling through these three materials, we can see that the speed of the pulse can vary greatly depending on the medium. The coiled spring toy will slow down the pulse, the rope will have a moderate speed, and the metal rod will have a very fast speed due to its ability to conduct sound waves efficiently.
When a pulse is sent through a medium, it travels at a certain speed. However, the speed at which the pulse travels can differ depending on the type of medium it is traveling through.
If you pull on one end of a coiled spring toy, the pulse will not reach the other end instantaneously. This is because the pulse must travel through the coiled spring, which can cause the pulse to slow down or speed up depending on the tightness of the coils.
If you pull on a rope, the pulse will travel through the rope at a certain speed. The speed at which the pulse travels will depend on the material of the rope and the tension of the pull.
If you hit the end of a metal rod, the pulse will travel through the rod at a much faster speed than the previous examples. This is because metals are better conductors of sound waves than other materials.
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An elevator car has two equa masses, m, attached to the ceiling as shown. the elevator ascends with an acceleration of magnitude a.
a. what are the tensions in the two cords in terms of m, a, and g?
b. If a is increased until one cord breaks will it be the upper or lower cord? c. What are tensions if the cable attached to the top of the elevator car snaps? (Use the following as necessary: m and g.)
Answers
The tensions in the two cords are: T1 = m(a + g) upward T2 = m(a + g) upward. If the acceleration is increased until one cord breaks, it will be the lower cord that breaks. In this case, the tension in each cord would be: T1 = m(g + a) downward T2 = m(g + a) downward.
a. The tensions in the two cords can be found using Newton's second law, which states that the net force on an object is equal to its mass times its acceleration. In this case, each mass is subject to two forces: its weight (mg) pulling downward and the tension in the cord pulling upward. Since the elevator is accelerating upwards, the net force on each mass is (ma + mg) upward. Therefore, the tensions in the two cords are:
T1 = m(a + g) upward
T2 = m(a + g) upward
b. If the acceleration is increased until one cord breaks, it will be the lower cord that breaks. This is because the tension in the lower cord is supporting more weight (m*g) than the tension in the upper cord (which is only supporting the weight of the upper mass).
c. If the cable attached to the top of the elevator car snaps, both masses will fall with an acceleration of g. In this case, the tension in each cord would be:
T1 = m(g + a) downward
T2 = m(g + a) downward
Note that the tensions are now pointing downward because they are no longer supporting the weight of the masses, but instead are trying to slow their fall.
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I can't understand
like which energy changes are involved
which energy it was first and which it was converted into
Answers
Answer:
turtle
Explanation:
i have a few questions
multipe choice
8) Kinetic energy is the energy of ________.
9)The potential energy of an object depends on its ________ and its height.
10) The law of ________ of energy states that energy can be neither created nor destroyed, but it can change its form.
11) Stored energy is called ________ energy.
12) When you move your hand or foot, your body has converted potential energy into ________ energy.
13) When coasting while roller skating, you eventually stop due to ________.
please and thank you
Answers
Energy refers to the ability or capacity to do work. Energy can be of various types as follows:
Mechanical energy (kinetic or potential)Electrical energyLight energySolar energyHeat energyKinetic energy is energy possessed by an object because of its motion while potential energy is energy possessed by an object because of its position or its condition.
The law of conservation of energy states that energy cannot be created nor destroyed but can only be transformed i.e. converted from one form to another.
Friction is a force that resists the relative motion or tendency to such motion of two bodies in contact.
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An electric iron is rated at 900 watts on a 120-volt circuit.
How much current does the iron draw from the outlet?
If the outlet is part of a circuit with a 20-ampere circuit-breaker or fuse, what are the maximum number of irons that can be operated on this circuit?
Answers
Answer:
I = 7.5 a
2 iron
Explanation:
P = VI
I = 900/120 = 7.5 A
Number of irons that can be used = 20/7.5= 2.66 that is 2 can be used
two charges that are 1 meter apart repel each other with a force of 2 n. if the distance between the charges is increased to 2 meters, the force of repulsion will be
Answers
Answer: Two charges that are 1 meter apart repel each other with a force of 2 N. If the distance between the charges is increased to 2 meters, the force of repulsion will be 0.5 N.
What is Coulomb's law?
Coulomb's law is a scientific law that relates to the interaction between two electrically charged objects. The power of the force acting between two point charges is proportional to the product of the magnitude of the charges and inversely proportional to the square of the distance between them.
Coulomb's law equation can be written as: F = k(q₁q₂)/r²
Where, F is the electric force, q₁ and q₂ are charges, r is the distance between charges, and k is a constant with a value of 8.99 x 10⁹ Nm²/C².
So, when the distance between two charges is doubled, the force of repulsion decreases by a factor of four (2²).
Therefore, if the distance between the two charges is increased to 2 meters, the force of repulsion will be 2/4 = 0.5 N.
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Write an algorithm that calculate the time a train need to arrive at a detination given peed and ditance
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An algorithm that calculates the time a train needs to arrive at a destination given speed and distance \(Time=\frac{Distance}{Speed}\).
What is Speed?The amount of the shift in approach per unit of time or the size of the displacement over time for an object can be used to describe speed, which would be a scalar quantity in everyday language and kinematics.
The maximum speed that can be maintained when a period grows closer to zero is the starting speed.
By dividing the object's distance traveled by the duration of the interval, the mean pace of the object for the given period is calculated. Speed and velocity are not always the same thing.
The algorithm to calculate the time required will be,
Let the distance covered by the train is D and the speed of the train be S.
Then, the time taken by the train will be,
T = D/S
Here, D is the distance and S is the speed.
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which force is a contact force
Answers
Find the kinetic energy of a 3.5 kg cat that has a momentum of 0.22 kg • m/s.
A) 3.98 x 10^-5 J
B) 4.32 x 10^-4 J
C) 6.91 x 10^-3 J
D) 7.22 x 10^-2 J
Answers
Answer:
6.19*10^-3 J
Explanation:
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Which, if either, exerts the larger gravitational force on the other?
Multiple Choice
the Earth on the sun
the sun on the Earth
They both exert the same force on each other.
Answers
The Given statement "Which, if either, the sun and the moon exerts the larger gravitational force on the other" is They both exert the same force on each other.
According to Newton's Third Law of Motion, for every action, there is an equal and opposite reaction. This means that the Earth and the sun both exert the same gravitational force on each other, despite their differences in size and mass.
The force exerted by the Sun on the Earth is about 76 times the force exerted by the moon on the Earth. The earth is an oblate spheroid, and that means it bulges out in the middle (the equator). That also means the poles end up a little closer to the centre of gravity. That is why on the surface of earth, at the poles the intensity of gravity is the maximum.
The gravitational force that the Sun exerts on Earth is much larger than the gravitational force that Earth exerts on the Sun.but still They both exert the same force on each other.
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A hockey ball accelerates from 0 m/s to 25 m/s in 0.05 seconds. What is the acceleration of the ball?
Answers
Answer:
500
Explanation:
25/0.05
in an out of control ceramics workshop, two clay balls collide in mid air and stick together. the first has mass 1.71 kg and collides with a second that is initially at rest. the composite system moves with a speed equal to one-third the original speed of the 1.71 kg ball. what is the mass of the second sphere? answer in units of kg.
Answers
Therefore, the mass of the second sphere is 5.13 kg.
Let's call the mass of the second sphere "m".
According to the law of conservation of momentum, the total momentum of the system before the collision is equal to the total momentum of the system after the collision.
Before the collision, only the 1.71 kg ball is moving, so its momentum is:
p1 = m1 * v1
where v1 is the initial velocity of the 1.71 kg ball.
After the collision, the two balls stick together and move as one object. We're told that the speed of the composite system is one-third the original speed of the 1.71 kg ball, so the final velocity of the composite system is:
vf = (1/3) * v1
The total momentum of the composite system after the collision is:
p2 = (m1 + m) * vf
Setting p1 equal to p2 and solving for m, we get:
m1 * v1 = (m1 + m) * vf
m * vf = m1 * v1 - m1 * vf
m = (m1 * v1 - m1 * vf) / vf
Substituting in the given values and simplifying, we get:
m = (1.71 kg * 3v1/3 - 1.71 kg * v1) / (v1/3)
m = (1.71 kg * v1) / (v1/3)
m = 5.13 kg
Therefore, the mass of the second sphere is 5.13 kg.
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Question by how much would the answer change if the plane coasted for 2. 0 s before the pilot applied the brakes?
Answers
There will be no change in the answer.
The answer to the initial problem would remain the same, as the velocity at the time of braking is the determining factor in calculating the stopping distance, regardless of whether the plane coasted for 2.0 s before the brakes were applied or not. The time it took for the plane to coast would not affect the velocity of the plane or the stopping distance, since coasting is a type of motion with constant velocity. The only factor that would affect the stopping distance is the initial velocity of the plane, which would determine the amount of work required to bring the plane to a stopTo know more about velocity visit:
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Ryan has a reaction time of 0.20 seconds. he is driving along at a speed of 21 m/s, when he sees a baby rabbit in the road only 35.0 meters ahead of him. he hits the brakes and the car slows down at a rate of 8.0 m/s2. how far will the car travel from the time he sees the rabbit until his car comes to a complete stop?
Answers
The amount of time it takes you to start responding after the environment has changed is known as the reaction time.
From the moment he sees the rabbit until his car comes to a complete halt, how long will the car travel?
A simple internet search revealed that it normally takes people 2.3 seconds to respond after spotting an object and applying the brakes. We know how long it will take to react, therefore we must convert miles per hour to metres per second.
Initial velocity is 21 m/s, and the ultimate speed is 8.0 m/s with a negative acceleration time of 0.20 seconds.
v2=u2+2as
Distance equals speed times time, or -6.3 x 0.20, or 1.26 m.
When given multiple stimuli, simple reaction time entails choosing one unique and accurate answer from a range of options.
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how to answer thiss helppp
Answers
Answer:
Look at work
Explanation:
Your given the mass of planet M and radius as well as second mass.
Use universal gravitation law to find force of gravity
Fg= Gm1m2/r^2
Plug in givens
Fg= 553.6 N
Use newtons second law
Fg= ma
553.6N=5a
solve for a= 110.72m/s
Weight is 553.6N
When rutherford bombarded thin gold foil with a-particles,he found that some a-particles were deflected through large angles. Which statement explains this deflection?
Answers
Answer:
the nucleus of the atom you have conserved almost all its mass in a very small volume
Explanation:
In Rutherforf's experiment, most alpha particles had few deflections, eg a few of them were deflected at small angles, a much smaller number deflected at large angles, and very few were deflected.
The explanation that I found for this is that if all the mass and the positive charge of the atom is in a small volume, they could specifically calculate this the relationship of the volumes,
V_atom / V_nucleo = 10⁴
Therefore, the phrase that explains the observing phenomenon is that the nucleus of the atom has concentrated almost all its mass, very small emolument and in that same volume is all the positive charge of the atoms.
In summary, the phrase that describes the process is:
the nucleus of the atom you have conserved almost all its mass in a very small volume
If a tow truck pulls a 907 kilogram pickup with a force of 1500 Newtons. How fast do the trucks accelerate?
Answers
Answer:
accelaration= 1.654 m/s²
Explanation:
accelaration= force/mass
a= \(\frac{F}{m}\)
a= \(\frac{1500}{907}\)
a= 1.654 m/s²
how did clair patterson determine the age of earth
Answers
Answer:
Patterson isolated lead from fragments of a meteorite that had struck Earth thousands of years ago, and determined the age of the fragments by analyzing proportions of the lead isotopes. The meteorite is assumed to have been formed at the same time as the rest of the solar system, including Earth
Explanation:
Work done by STATIC FRICTION is alwaysO positive,O negative, O perpendicular to the surface along the surface. O Zero.
Answers
The right answer is (d). Static friction can cause a system to do positive, negative, or even zero work.
Does static friction ever produce zero work?
At essence, static friction can also be active when a body is in equilibrium, when there is no movement and no static frictional work to be done.
Can static friction provide useful results?
This is because our force is opposed by the force of static friction. However, since the block stays there, there is no displacement. Therefore, friction produces no work. Friction can therefore produce positive, negative, or no work.
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Treatment for dissociative identity disorder typically starts with ____.
a. identifying one's "true" personality c. labeling the disorder for the client
b. working through traumatic memories d. finding the most appropriate medication
Answers
Treatment for dissociative identity disorder typically starts with working through traumatic memories. The correct option is b.
The initial step in the treatment of dissociative identity disorder typically involves addressing and processing traumatic memories.When starting treatment for dissociative identity disorder (formerly known as multiple personality disorder), it is commonly necessary to focus on working through the traumatic memories. This disorder is frequently linked to a background of significant trauma, such as childhood abuse or neglect. The primary objective of therapy is to assist individuals with dissociative identity disorder in integrating their multiple identities and fostering a unified sense of self. This process often entails confronting and processing the traumatic experiences, which aids in healing and integration.Therefore ,option b is correct.
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an 8.25 kgkg point mass and a 13.5 kgkg point mass are held in place 50.0 cmcm apart. a particle of mass mm is released from a point between the two masses 16.0 cmcm from the 8.25 kgkg mass along the line connecting the two fixed masses.Find the magnitude and direction of the acceleration of the particle.
Answers
The particle's acceleration is 3.7*10-9 m/s2, according to the formula. A point mass of 8.25 kg and a point mass of 13.5 kg are kept in site at a distance of 50.0 cm.
Here, the mass m is pulled toward the two particles by gravity. the force generated by the initial mass moving in a -X direction and the second mass moving in a +X direction.
The following is the expression for Newton's law of gravitation:
F =GMm/r^2
The gravitational constant G, the masses M and m, the gravitational force F, and the separation between the mass center's r are all present in this situation. the force acting against the first mass is negative, When we substitute F=GM1m/r1, we obtain,
F1 = -(6.67x10^-11 Nm'/kg)(8.25kg)m/(0.2m)*(0.2m)=-1.37x10^-8 m
F2 also equals 1*10^-8.
F2 = F1+F2
ma = F1+F2
acceleration = F1+F2/m
acceleration = -1.3*10^-8 +1*10^-8m/m
a = -3.7*10^-9 m/s^2
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What conflict category would “a boy mentally debating about going to the park” be?
Answers
Answer:
Character vs. self, Person vs. self, or conflict with the self (they're all the same thing.)
A hot air balloon is ascending vertically with a speed of 5.4 m/s. While looking out over the edge of the basket, Josh's sunglasses fall off and start falling towards the ground. (a) If the sunglasses take 7.0 seconds to reach the ground, how far above the Earth was the balloon when the sunglasses started to fall? (b) With what velocity do the sunglasses hit the ground? (c) what is the acceleration of the hot air balloon?
Answers
We have the following regarding the motion;
1) The height from which the glasses fell is 278 m
2) The velocity at the time of the fall is 74 m/s
3) The acceleration of the hot balloon is 9.8 m/s^2
What is the speed of the sunglasses?We know that we can obtain the height that the glasses started falling from by the use of the equation;
h = ut + 1/2 gt^2
h = height
u = initial velocity
g = acceleration due to gravity
t = time taken
Then;
h = (5.4 * 7) + (0.5 * 9.8 * (7)^2)
h = 37.8 + 240.1
h = 278 m
The velocity when it fell to the ground is obtained from;
v = u + gt
v = 5.4 + (9.8 * 7)
v = 74 m/s
c) Given the fact that the motion was under gravity, the hot balloon was having an acceleration of 9.8 m/s^2
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Which description best explains an ionic bonding?
a
shares electrons
b
occurs between non-metals
c
molecular bonding
d
donates electrons
Answers
Ionic bond is formed when one atom accept electron and the other atom loses electron.
What is ionic bonding?Donates electrons is the description that best explains an ionic bonding because in ionic bonding, one atom loses electron and the other atom accept that electron in order to gain stability.
So we can conclude that donates electron is the correct answer.
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a car has hit a 14-year-old boy. what is the best way to open his airway?
Answers
If a car hits a 14-year-old boy, the best way to open his airway is to use the jaw-thrust maneuver.
Opening a person's airway after they have been injured in an accident is crucial first aid, especially if there is a potential that they may have sustained head or neck injuries. Here, the jaw-thrust manoeuvre would be the most effective technique to access the airway. It is necessary to kneel near the injured individual and approach them from behind their back.
One can clear the airway by using the jaw-thrust manoeuvre without running the danger of further neck or spine damage. It's crucial to keep an eye on someone's breathing and to be ready to give them rescue breathing if necessary. The recommended course of action is to wait for medical personnel to provide advanced airway care if the patient is unconscious, not breathing, or has a suspected spinal injury.
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A balloon is partially inflated and sealed. A number of weights are attached to the balloon such that it is neutrally buoyant when submerged at a certain depth in a beaker of water. Describe the motion of the balloon, if you push the balloon down to a greater depth and release it. Explain.
Answers
This motion of the balloon is an example of buoyancy, which is the upward force exerted by a fluid on an object immersed in it.
Example of buoyancy motionWhen the balloon is neutrally buoyant, it means that the weight of the balloon and the weights attached to it is equal to the weight of the water displaced by the balloon.
If you push the balloon down to a greater depth and then release it, the balloon will rise back up to its original position.
This is because the balloon is still partially inflated and contains air, which is less dense than water. When you push the balloon down, the water pressure compresses the air in the balloon, causing it to become smaller in size.
When you release the balloon, the compressed air expands and pushes the balloon upwards towards the surface of the water.
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True or false? One disadvantage of wave power is that it pollutes the sea.
Answers
Answer:
the question is false
What would stars be like if hydrogen had the smallest mass per nuclear particle?.
Answers
Even in stars of any mass, nuclear fusion would not take place if hydrogen had the least mass per nuclear particle.
What is Nuclear fusion?This is the method through which heavier elements are created through nuclear reactions between light elements. If hydrogen had the minimum mass per nuclear particle, nuclear fusion would not be possible in stars of any mass due to the unfavorable subatomic particle environment.
A process known as nuclear fusion occurs when two or more atomic nuclei fuse to create new atomic and subatomic particles. Energy is released or absorbed depending on how much mass there is between the reactants and products.
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