the intensity at a distance 5.0cm from a point source of light is 25.0watts/m2. what is the intensity at a distance of 2.5cm from the source?
Answers
The intensity at a distance of 2.5cm from the point source is 100.0 watts/m².
The intensity of light decreases as the distance from the point source increases. The relationship between intensity and distance is inversely proportional to the square of the distance. This means that if the distance is halved, the intensity will be four times greater.
In this case, the intensity at a distance of 5.0cm is given as 25.0 watts/m². To find the intensity at a distance of 2.5cm, we can use the inverse square law:
I₁/I₂ = (d₂/d₁)²
where I₁ is the intensity at the initial distance (5.0cm), I₂ is the intensity at the new distance (2.5cm), d₁ is the initial distance, and d₂ is the new distance.
Plugging in the values,
25.0/I2 = (2.5/5.0)²
Solving for I₂, we get,
I₂ = 4 x 25.0 = 100.0 watts/m²
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Related Questions
Which option below illustrates the electrical force?
A. A balloon sticks to a person's head after he rubs the balloon on
his hair.
B. A car remains parked on a hill despite the gravitational force
pulling it downward.
C. An electromagnet is used to sort iron from other metal at a
recycling plant.
D. A sock is stuck to the side wall of a spinning washing machine
drum.
Answers
Could there ever be a situation where a small sports car could have more inertia than a big bus?
Answers
The isotope 14/6C has a half-life of 5730 years. What is the fraction of 14/6C in a sample with mass, m, after 34380 years?
Answers
A model of exponential decay describes the decay of 14/6C. After time t, the equation for the amount of 14/6C left is:
\(\rm N(t) = N0 \times (1/2)^{(t/T)\)
What is the 14 C decay constant with a 5730-year half-life?Given that the half-life of C-14 is currently known to be 5730 years, we can now compute the decay constant, which is equal to k=0.693t1/2, where t1/2 is a representation of the half-life.
The half-life of 14C is now estimated to be 5,730 years. The implication of this is that just 50% of the initial.
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Which atmospheric gases are increasing as a result of human activities?
Answers
Answer:
Many of these gases occur naturally, but human activity is increasing the concentrations of some of them in the atmosphere, in particular:
carbon dioxide (CO2)
methane.
nitrous oxide.
fluorinated gases.
Explanation:
Answer: Obviously carbon dioxide, nitrogen argon, neon, helium, krypton.... etc etc....
Explanation: Have a great day!!!
Matter moves ( up & down / left& right ) when the energy moves from left to right
Answers
The individual coils of the medium will be moved above and downwards as the energy moves from left to right. The movement of the medium's particles is opposite to the direction of the pulse.
How do matter and energy move when they're riding an up-and-down wave?The particles slow down as they go upward or downward towards the wave crest or trough, respectively, from their normal position. This indicates that kinetic energy has been partially transformed into potential energy.
Do waves simply move objects up and down or also in a lateral direction?Many people believe that water waves force water in one direction and then push it in another. However, in practise, the water vapour tends to concentrate in one place.
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in parallel rlc circuits, the ? is the same and is ? phase across all branches and is used as the main reference for calculations.
Answers
In parallel RLC circuits, the voltage is the same and is in-phase across all branches and is used as the main reference for calculations.
In a parallel RLC circuit, the current is determined by the resistance, inductance, and capacitance. The maximum current and the maximum voltage occur simultaneously because the voltage and current through the resistor are in phase. This is so that there is no phase shift between the voltage and the current caused by the resistance.
On the other hand, the voltage is 90 degrees behind the current passing through the capacitor, and the voltage is 90 degrees ahead of the current going through the inductor. As a result, the resistive current and voltage are in phase, which means that when the voltage is at its highest, the resistive current likewise reaches its peak and vice versa.
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7: A current of 3 ohm is drawn from 13v battery for 25 second find:
a) Charge
b) Energy in joules
c) Energy is transferred to the circuit in 15 second
Answers
Answer: To calculate the quantities related to the given electrical circuit, we can use the formulas related to charge, energy, and power.
a) Charge (Q):
The charge can be calculated using the formula: Q = I * t, where I is the current and t is the time.
Given:
Current (I) = 3 ohms (A)
Time (t) = 25 seconds
Q = 3 A * 25 s = 75 Coulombs
b) Energy (E):
The energy can be calculated using the formula: E = V * Q, where V is the voltage and Q is the charge.
Given:
Voltage (V) = 13 V
Charge (Q) = 75 C
E = 13 V * 75 C = 975 Joules
c) Energy transferred in 15 seconds:
To calculate the energy transferred in 15 seconds, we need to find the power first.
Power (P) can be calculated using the formula: P = V * I, where V is the voltage and I is the current.
Given:
Voltage (V) = 13 V
Current (I) = 3 A
P = 13 V * 3 A = 39 Watts
Now, we can calculate the energy transferred in 15 seconds using the formula: E = P * t, where P is the power and t is the time.
Given:
Power (P) = 39 W
Time (t) = 15 s
E = 39 W * 15 s = 585 Joules
Therefore, the answers are:
a) Charge = 75 Coulombs
b) Energy = 975 Joules
c) Energy transferred in 15 seconds = 585 Joules
Explanation:
What happens along a divergent boundary?
Answers
Answer:
Two tectonic plates move away from each other
Explanation:
I just did this on AP3X. If this is not what your lookinf for then so sorry
Two masses m1 and m2 exert a gravitational force of 12 N onto each other when they are 6 m apart. What will the gravitational force be if the masses are moved closer to be 3 m apart?
Answers
Answer:
F = 48 N
Explanation:
The gravitational force between two object is given by Newton's Gravitational Law as:
F = Gm₁m₂/r²
where,
F = Gravitational Force = 12 N
G = Universal Gravitational Constant
m₁ = mass of first object
m₂ = mass of second object
r = distance between them = 6 m
Therefore,
12 N = Gm₁m₂/(6 m)²
Gm₁m₂ = 432 Nm² ---------------- equation 1
Now, for r = 3 m:
F = Gm₁m₂/(3 m)²
using equation 1:
F = (432 Nm²)/(9 m²)
F = 48 N
Two masses m₁ and m₂ exert a gravitational force of 12 N when they are 6m apart, if they are now 3 m apart, the gravitational force is 48.02 N.
The gravitational force is given by:
\( F = \frac{Gm_{1}m_{2}}{d^{2}} \)
Where:
m₁ and m₂ are the masses of the first and second body, respectively
G: is the gravitational constant = 6.67x10⁻¹¹ N*m²*kg⁻²
d: is the distance between m₁ and m₂
When the two masses exert a gravitational force of 12 N when they are 6 m apart, we have:
\( F_{1} = \frac{Gm_{1}m_{2}}{d_{1}^{2}} \)
\( 12 N = \frac{6.67 \cdot 10^{-11} N*m^{2}kg^{-2}*m_{1}m_{2}}{(6 m)^{2}} \)
\( m_{1}m_{2} = \frac{12 N*(6 m)^{2}}{6.67 \cdot 10^{-11} N*m^{2}kg^{-2}} = 6.48 \cdot 10^{12} \:kg^{2} \)
When the distance is 3 meters, the gravitational force is:
\( F_{2} = \frac{Gm_{1}m_{2}}{d_{2}^{2}} = \frac{6.67 \cdot 10^{-11} N*m^{2}kg^{-2}*6.48 \cdot 10^{12} \:kg^{2}}{(3 m)^{2}} = 48.02 N \)
Therefore, the gravitational force will be 48.02 N if the masses are 3 m apart.
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Describe how a star is formed?
____________________________
Answers
as gasses like hydrogen start to gather, it creates more mass, therefore more gravitational attraction. As the gasses start to collect to considerably large amounts, the gas at the center of the mass starts to compress. As the gas keeps growing, the immense pressure on the core grows and grows, raising the temperature to extreme amounts. As this happens the star starts to undergo a process called nuclear fusion. this process occurs when immense pressure and heat cause the electrons to escape from their nuclei and flow around freely. this is what the fourth state of matter is. this type of matter is called plasma. this alone creates incredible amounts of heat and energy. The main part of the fusion process though is that the nuclei in which the electrons escaped from begin to merge, creating heavier nuclei, therefore creating heavier and denser nuclei. as the nuclei combine they also form denser elements, such as helium (fist merge of nuclei) all the way to eventually iron (last merge before nuclei is at its heaviest. This entire process takes billions of years to go from helium to the extremely dense iron, and stars usually only reach iron if they are big enough (a lot larger than our sun) so that the pressure will be able to keep fusing nuclei. if they dont reach iron, at the end of their life, the fuel from the inside will be used up and the core has to compensate for the gravitational force of the outer star pushing in. this means the star will grow as the outward force becomes greater than the gravitational force. the star will stay like this for a while before finally using up all the fuel and slowly dying off and shrinking. the shrinking star (or dying star) is known as a white dwarf
that is the long answer
Answer:
Star Formation
Stars are born within the clouds of dust and scattered throughout most galaxies. A familiar example of such as a dust cloud is the Orion Nebula. Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction.
hy XD ~
Answer this question using the wave interference graph
Answers
The wavelength of the wave 1 is 8 unit. wavelength is nothing but distance of the wave to complete one cycle. or wavelength is the distance between two points which are in same phase.
A fundamental idea in physics, wavelength is an important characteristic of waves. It describes the separation between two parallel, in-phase points, such as two crests or two troughs.
The qualities of a wave, such as its frequency and energy, are determined by its wavelength. While in certain forms of waves, like sound waves, wavelength affects pitch and tone, with electromagnetic waves, various wavelengths correlate to different colors in the visible spectrum.
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Which of the following is the best description of the first law of thermodynamics? The entropy of an isolated system increases until the system reaches thermal equilibriunm Thermal energy flows from the colder object to the warmer object. outside force. The change in thermal energy ofa systemis equal to the energy transferred into An objet will maintain its current state of motion unless acted upon by an or out of the system as work, heat, or both.
Answers
The change in thermal energy of a system is equal to the energy transferred into or out of the system as work, heat, or both.
The first law of thermodynamics, also known as the law of energy conservation, states that energy cannot be created or destroyed in an isolated system.
Instead, it can only be transferred or converted from one form to another. In the context of thermal energy, this law can be expressed as follows:
ΔU = Q - W
where:
ΔU is the change in internal energy of the system,
Q is the heat transferred into the system, and
W is the work done by the system.
This equation shows that the change in thermal energy of a system is equal to the energy transferred into the system as heat (Q) minus the work done by the system (W).
The first law of thermodynamics is a fundamental principle that describes the conservation of energy in a thermodynamic system.
It states that the change in thermal energy of a system is determined by the net transfer of energy into or out of the system as heat and work.
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People often use simple machines like pulleys, levers, and ramps because they say the machine “makes the work easier.” Which of the following statements about simple machines is true?
a.
Simple machines often reduce the amount of work to move an object.
b.
Simple machines often reduce the energy required to move an object.
c.
Simple machines often reduce the power consumed when moving an object.
d.
Simple machines often reduce the force needed to move an object.
Answers
Hope this help
You are on the roof of the physics building, 46.0 m above the ground. Your physics professor, who is 1.80 m tall, is walking alongside the building at a constant speed of 1.20 ms −1 . If you wish to drop a flower on your professors head, where should the professor be when you release the flower? Assume that the flower is in free fall.
Answers
To drop a flower on your physics professor's head, they should be 23.3 meters away from the point directly below you when you release the flower.
Determine the time takes for the object?The time it takes for an object to fall freely can be calculated using the equation: Δy = (1/2)gt², where Δy is the vertical distance, g is the acceleration due to gravity (approximately 9.8 m/s²), and t is the time. In this case, the vertical distance is 46.0 meters.
Solving for t, we have: 46.0 = (1/2)(9.8)t². Rearranging the equation gives: t² = (2 * 46.0) / 9.8. Thus, t ≈ √(92.0 / 9.8).
To determine the horizontal distance, we can use the equation: d = vt, where d is the horizontal distance, v is the velocity, and t is the time. The professor is walking at a constant speed of 1.20 m/s.
Therefore, the horizontal distance is d = 1.20 * √(92.0 / 9.8) ≈ 23.3 meters.
Thus, the professor should be 23.3 meters away from the point directly below you when you release the flower in order for it to hit their head.
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Consider the percentage differences between the total momentum before the collision and the total momentum after the collision for the various trials of Collisions [, II; and III: [f they are less than 10%, they are good evidence that momentum is conserved and if they are less than 5%, they are very good evidence: To what extent do your data indicate that momentum is conserved?
Answers
Based on the information provided, it seems that the question is related to a physics experiment involving collisions. The question asks about the percentage differences between the total momentum before and after the collision, and whether these differences indicate that momentum is conserved.
In physics, momentum is defined as the product of mass and velocity. When two objects collide, they exchange momentum, and the total momentum of the system should remain constant if no external forces act on the system. This is known as the principle of conservation of momentum. In the experiment described in the question, the collisions were conducted in three different trials, labeled I, II, and III. For each trial, the percentage difference between the total momentum before and after the collision was calculated. If the difference was less than 10%, it was considered good evidence that momentum was conserved. If the difference was less than 5%, it was considered very good evidence. Based on the data collected, it can be determined to what extent momentum was conserved in the different trials. If the percentage differences were within the acceptable range (i.e., less than 10% or less than 5%), it would suggest that momentum was conserved in those trials. However, if the differences were greater than 10%, it would indicate that momentum was not conserved, and there may be external forces acting on the system that are affecting the momentum. Therefore, without knowing the actual percentage differences obtained in the experiment, it is not possible to determine to what extent momentum was conserved. The data collected would need to be analyzed to determine whether momentum was conserved in each of the three trials.
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Help if you understood pleas and rhanks
Answers
Answer:
the velocity is 4 ms, if it asked for change it be 0 m/s but its asking for velocity so option 4, 4m/s
Explanation:
The correct answer is Option 2: 2 m/s². The acceleration of the object at 8 seconds is 2 m/s². Note that the negative sign indicates that the acceleration is in the opposite direction of the velocity.
To calculate the acceleration of the object at 8 seconds, we need to look at the change in velocity over time (acceleration is the rate of change of velocity).
Given the graph, we can see that at 8 seconds, the velocity of the object is 6 m/s.
Now, let's find the change in velocity between 8 seconds and 10 seconds:
Change in velocity = Final velocity - Initial velocity
Change in velocity = 2 m/s - 6 m/s
Change in velocity = -4 m/s
Next, find the time interval between 8 seconds and 10 seconds:
Time interval = Final time - Initial time
Time interval = 10 s - 8 s
Time interval = 2 seconds
Now, calculate the acceleration:
Acceleration = Change in velocity / Time interval
Acceleration = (-4 m/s) / (2 s)
Acceleration = -2 m/s²
The correct answer is Option 2: 2 m/s². The acceleration of the object at 8 seconds is 2 m/s². Note that the negative sign indicates that the acceleration is in the opposite direction of the velocity.
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5. A mixture of fuel and air is enclosed in an engine cylinder fitted with a piston. The gas pressure is maintained at 7.07 × 10^5 Pa as the piston moves slowly inward. If the gas volume decreases by 1.1 × 10^−4 m^3 and the internal energy of the gas increases by 62 J, how much energy is added to or removed from the system as heat?
Answers
The energy that is removed from the system as heat is 139.8 J.
What is the internal energy?
Internal energy is the total energy of a thermodynamic system, including the kinetic energy of its constituent particles and their potential energy due to their relative positions and interactions. It is a measure of the total thermal energy of a system and is a function of temperature, pressure, and volume.
We know that the work done can be obtained by the use of the equation;
w = PΔV
Then
w = 7.07 × 10^5 * 1.1 × 10^−4
w = 77.8 J
Then we have that;
E = q + w
-62 J = q + 77.8
q = 77.8 + 62
= 139.8 J
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A negative charge of -2.5 C and a positive charge of 2.0 C are separated by 100 m. What is the force between the two charges?
Answers
Explanation:
F = k |q1| |q2| / r^2
k = 9 * 10^9
q1 = - 2.5 C
q2 = 2 C
r = 100
r^2 = (10^2)^2 = 10^4
F = (9*10^9) * ( 2.5 ) ( 2) / ( 100)^2
F = 45* 10^9 / 10^4
F = 45 * 10^9 * 10 ^ -4 = 45 * 10^5 N
F = 45 * 10 ^ 5 N
The model above shows sunlight that is directly hitting one side of the earth during its winter season. Which sentence explains why this area is experiencing shorter hours of daylight
Answers
Answer:
During winter time the northern hemisphere leans away from the sun due to the rotation of earth and due to this change the sunlight is not direct on these areas instead it is spread and due to this the shadows are longer and the sunlight is not intense. The earths rotation around the sun causes the seasons to change and that is why we experience shorter hours of daytime.
Explanation:
During winter time the northern hemisphere leans away from the sun due to the rotation of earth and due to this change the sunlight is not direct on these areas instead it is spread and due to this the shadows are longer and the sunlight is not intense. The earths rotation around the sun causes the seasons to change and that is why we experience shorter hours of daytime.
Evaluate cos(30°).
ОА. 1.00
ов. 0.87
ОС. 0.50
ОС
D. 0.58
Answers
Answer:
The answer for cos(30°) is 0.87
for a lateral projection of the foot the central ray is directed to the
Answers
For a lateral projection of the foot, the central ray is directed to the side of the foot being imaged.
In particular, the central ray travels through the medial side of the foot, which is the side closest to the body's midline, and is directed perpendicular to the image receptor (such as an X-ray film or digital detector).
By providing a side image of the foot, this projection enables visualization and evaluation of the bones, joints, and soft tissues from a lateral angle. It is frequently employed in diagnostic imaging to assess foot fractures, dislocations, and other anomalies.
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Is this right? Please help me. ITS SOCIOLOGY!!
Answers
Answer:
i think so
Explanation:
4) Gabo bought three chicken dinners for $6.95 each and one hamburger meal for $5.75. He and three friends decide to divide the cost of the meals equally. How much money does Gabo receive in total from his three friends?
(A) $6.35 (B) $6.65 (C) $19.65 (D) $19.95 (E) $26.60
Answers
Answer: the answer is d $19.95
Explanation:
chicken dinner: 6.95 x 3 = 20.85
burger: 5.75
20.85 + 5.75 = 26.6
26.6 divided by 4 (bc theres 4 ppl and the bill needs to be split equally)
26.6/4= 6.65
and since 3 friends are paying him back u gotta do 6.65 x 3 = 19.95
A man has a mass of 66 kg on Earth. What is his weight in Newtons?
Answers
Answer:
answer is 66 kilograms-force = 647.2389 newtons
Explanation:
Answer:
\(\boxed {\boxed {\sf 646.8 \ Newtons }}\)
Explanation:
Weight in Newtons can be found by multiplying the mass times the acceleration of gravity.
\(W=m*g\)
The mass of the man is 66 kilograms on Earth.
Earth has an acceleration of gravity that is 9.8 meters per square second.
\(m= 66 \ kg \\g=9.8 \ m/s^2\)
Substitute the values into the formula.
\(W=66 \ kg *9.8 \ m/s^2\)
Multiply.
\(W=646.8 \ kg*m/s^2\)
1 kg * m/s² is equal to 1 Newton, therefore our answer of 646.8 kg *m/s² is also equal to 646.8 Newtons, or N.
\(W=646.8 \ N\)
The man's weight in Newtons in 646.8 Newtons.
Megan walks 1100 m to the left in 330s. What was her average speed in m/s?
Answers
Answer:
3.33m/s
Explanation:
Speed is the change in distance of a body with respect to time.
Speed = Distance/Time
Given
Distance = 1100m
Time = 330s
Speed = 1100/330
Speed = 3.33m/s
Hence her average speed in m/s is 3.33m/s
Answer:
3.33
Explanation:
khan academy
A spring had a spring constant of 48N/m. The end of the spring hangs 8m above the ground. How much weight can be placed on the spring so that the end of the spring is 2m above the ground
Answers
Answer:
28.8kg
Explanation:
h1=8m
h2=2m
h2-h1=6m
k=48 N/m
g=10m/(s^2)
w=F
10m=6*48
m=28.8kg
fluid mechanics
a) How does one generally describe friction in flows?
What is the difference between laminar and turbulent flow?
b) They should model the gas flow through the trachea!
1. What basic assumptions should you make?
2. The frictional force FR = 2πrlη (dvz/dr) ez acts on its lateral surface, acting on the top surface
the compressive force Fp = πr2( p1 − p2) ez. What is the flow for r = 0.5 * R? (Derivation!) Why is this model critical for colds? Please explain methodically!
c) A thought experiment on the blood vessels: Which factors determine the vascular resistance
with the flow? Why is this model critical for blood? Why is this simple model allowed
not be used for the renal vessels or the arterioles in the lungs?
Answers
This simple model is inadequate for the renal vessels or the arterioles in the lungs since it does not include all of the complexities related to the flow of blood in these vessels.
a) Friction in flows is generally described in fluid mechanics as a force that arises in the direction opposite to the fluid motion caused by a viscosity present in fluids. The viscosity determines the resistance of the fluid to shear or flow. In fluid dynamics, the movement of fluid is categorized into two types: laminar flow and turbulent flow.b)Assumptions for the model of gas flow through trachea: The following are the assumptions for the model of gas flow through trachea: The gas is considered as a continuum in the modeling of the gas flow through the trachea. The flow is steady, incompressible, and unidirectional. The flow of gas is considered to be laminar. There is no friction between the air and the walls of the trachea.The flow for r = 0.5 * R is: FR = 2πrlη (dvz/dr) ezThe frictional force FR = 2πrlη (dvz/dr) ez acts on its lateral surface. The compressive force Fp = πr2( p1 − p2) ez acts on its top surface. Vascular resistance is determined by a variety of factors, including the vessel's radius, length, and viscosity of the fluid. This model is crucial in blood because it aids in the comprehension of the dynamics of fluid flow through the blood vessels. This model is insufficient for the renal vessels or the arterioles in the lungs because it does not include all of the complexities associated with the flow of blood in these vessels.c) Vascular resistance is determined by the vessel's radius, length, and viscosity of the fluid. This model is crucial for blood because it aids in the comprehension of the dynamics of fluid flow through the blood vessels.
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A sprinter starts from rest and reaches a speed of 15 m/s in 4.25 s. Find his acceleration
Answers
Answer:
a=3.53 m/s^2
Explanation:
Vo=0 m/s (because he is not moving at the start)
V1=15 m/s
t= 4.25 s
a = (V1-Vo) / t = 15/4.25 = 3.53 m/s^2
what is economic development
Answers
Answer:
Economic Development is the creation of wealth from which community benefits are realized. It is more than a jobs program, it's an investment in growing your economy and enhancing the prosperity and quality of life for all residents. Economic development means different things to different people.
Pleeeease help! I'll give brainliest if possible!! :)))
Use the scenario to answer the question.
An astronomer discovers a new galaxy using a telescope. The astronomer wants to investigate how the galaxy is moving relative to the Milky Way galaxy.
In one or two sentences, make a hypothesis about the movement of the galaxy and explain at least one way to test the hypothesis.
Answers
The most scientific guess (hypothesis) based on what is known about the behavior of galaxies is that Galaxies are continuously moving away from each other. This hypothesis can be tested using Hubble's Law.
What does Hubble's Law Say?Hubble's law indicates that almost all galaxies are moving apart from one another because the universe as a whole is expanding. Choose any two galaxies at arbitrarily, and they're most likely traveling apart from each other.
Hubble discovered that galaxies move away from us at a rate proportionate to their distance: more distant galaxies move away faster than closer ones. The accompanying graphic shows Hubble's classic graph of measured velocity vs. distance for neighboring galaxies.
The graph shows a linear relationship between galaxy velocity (v) and distance (d).
The equation for the above linear relationship is:
v = H₀ x d
Where:
H₀ is the expansion rate
v = velocity of the galaxy; and
d = distance.
Using the above formula, the astronomer can measure or test to know whether indeed the new galaxy is moving relative to the Milky Way galaxy and at what rate.
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