307.4 μW/m² average magnitude of the poynting vector 5.00 mi with an average power of 250 kw?
S-average=power/area
power=250 kw
area=4π(8045)²
S-average=250/4π(8045)²
S-average=307.4 μW/m²
Power is produced when a force causes a displacement. Power has no bearing on how long it takes for a force to cause a displacement. The process's pace might range from swiftly concluding to taking some time. For example, it takes an abnormally long time for a rock climber to elevate her body a few meters over the cliff's edge. On the other hand, a trail hiker may swiftly raise her body a few meters if she selects the faster path up the mountain. Despite making the same amount of work, the hiker completes the task far quicker than the rock climber..
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You throw a ball straight forward with a velocity of 20
m/s, from a height of 1 meter. How far will it be when it hits the ground after 0.45 seconds?
The ball will continue to advance at a speed of 2.0 m/s once it rolls off the edge of the table until it lands on the ground after 0.45 seconds.
Why do we do it?The ball is behaving just like it has been dropped. Nature is unconcerned by the fact that it is also advancing.
D=1/2gt2 and T=√2d/g
By entering the table's height and the gravitational acceleration, we can calculate the time in seconds:
t= √2(1.5m)/9.8m⋅s−2 = 0.553s
So, for a little bit longer than a half-second, the ball will be in the air (and thus able to move ahead). To find the distance travelled, we simply reverse the speed equation, s=dt, and insert in the speed and time:
d= 20m/s(0.553s)= 1.11m
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You are bowling for a spare. There is just one pin left, and you make a nice play. As the 5.1 kg ball approches at a velocity of 3.40 m/s north it hits the pin! The 1.5 kg pin is sent into motion and the bowling ball continues to roll at a velocity of 0.87 m/s north. What is the final velocity of the pin?
Answer:
11.56 m/s
Explanation:
The momentum of the ball is transferred into the pin so the transfer of momentum has the formula, m1*v1 = m2 * v2
substituting the values,
5.1 * 3.40 = 1.5 * V2
17.34 = 1.5 * V2
V2 = 17.24 / 1.5
V2 = 11.56 m/s
When using a schematic for
troubleshooting, which of these is the best
property to follow?
A. the service
B. the meter
C. the power
When using a schematic for troubleshooting, the best property to follow is the meter and is denoted as option B.
What is Meter?This is referred to as any type of device which is built to accurately detect and display an electrical quantity in a form which is readable by a human being.
Examples of meters which are used by people include voltmeter, ohmeter etc which are used to read voltage and current respectively. It is used to troubleshoot when schematics are used as certain parameters are detected and analyzed so as to detect the issue and solve it appropriately.
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which factor is not usually considered by physicians when determining how much to charge for a procedure
The charge for a procedure or accepting fees that are predetermined by the plan is dependent on the patient's ability to pay.
What does a physician do?Doctors and surgeons deal with maintaining health as well as diagnosing and treating illnesses and injuries. In addition to conducting physical examinations and medical history inquiries, doctors also order, carry out, and interpret diagnostic tests. Patients frequently receive advice from them on food, cleanliness, and preventative healthcare.
Physician labor is the part of the Medicare Physician Fee Schedule that represents the overhead expenses related to a service.
Mistaken cost.practice cost.Factor of conversion.While precertification gives the provider permission to provide the medical service, preauthorization specifically establishes the dollar amount approved for the medical procedure.
The main distinction between doctors and physicians is that doctors typically specialize in a field of practice while physicians typically have a more general background.
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a 22.0 kg child is riding a playground merry-go-round that is rotating at 40.0 rev/min. what centripetal force must she exert to stay on if she is 0.891 m from its center? (hint: it's more than double her weight).
342.5 N of force must she exert to stay on if she is 0.891 m from its center while 22.0 kg child is riding a playground merry-go-round that is rotating at 40.0 rev/min
Since we are given the mas of the child which is 22.0 kg and the number of revolutions which is 40.0 rev/min which will be :
n=2*3.14 *40.0 /60 = 4.18 radians/s
and the distance from the center is 0.891 m( r). The formula we are referring to calculates the centripetal force :
F= m(n)²* r
=22(4.18)²*0.891
= 342.49 = 342.5 N
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why does the atmosphere of saturn appear to have only half the helium content of jupiter? why does the atmosphere of saturn appear to have only half the helium content of jupiter? much of saturn's helium has reacted with water and formed helium oxide. much of saturn's helium has differentiated towards its center. because saturn is so much colder, helium does not show up as strongly in its spectrum. a red dwarf, jupiter has fused some of its hydrogen into helium, whereas saturn, a colder planet, has not. saturn was formed farther from the helium rich sun.
The correct answer is option C.
The atmosphere of Saturn appear to have only half the helium content of Jupiter because Saturn is so much colder, helium does not show up as strongly in its spectrum.
The planet Saturn is a giant ball of gases including hydrogen, helium and methane. All these gases make up a thick atmosphere of the planet.
In general, the concentration of hydrogen is about 96.3%, helium 3.25% and methane 0.45%.
Clouds on Saturn are composed of ice crystals of ammonia and the temperature is around -400F which is much colder then Jupiter.
Thus, atmosphere of Saturn appear to have only half the helium content of Jupiter because Saturn is so much colder.
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cell phones use radio waves to transmit information. if your cell phone uses a frequency of 1900 mhz, what is the wavelength in meters of the electromagnetic radiation emitted by your phone? (1 hz
The wavelength of the electromagnetic radiation emitted by your phone is 1.578meters.
What is the wavelength of electromagnetic radiation?The name given to the recognized range of electromagnetic radiation is the electromagnetic spectrum (EMS). The frequency decreases from 3×10²⁶ Hz to 3×10³ Hz as wavelengths rise from around 10⁻¹⁸ m to 100 km.
The wavelength is the separation between two wave crests, while troughs have the same wavelength. Frequency, measured in cycles per second (Hz), is the number of vibrations that pass over a certain location in a second (Hertz).
Given,
Frequency = 1900 mhz = 1900×10⁶,
velocity = 3×10⁸,
Wavelength = v/F
Wavelength = 3×10⁸/ 1900×10⁶
Wavelength = 1.578meters.
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a car traveling but at 100 km/h and applies it's brake to stop the acceleration is -10 m/s2 how long does it take for the car to stop?
Answer:
10s [seconds]
Explanation:
[tex]t = \frac{v}{a} [/tex]
t = v/at = 100/-10t = -1010s [seconds]Jamari is doing a project on the levels of the rain forest. Which would be the most useful visual display to help make his information clear?(1 point)
Responses
a map of where rain forests are located
a map of where rain forests are located
a diagram with the parts of the rainforest labeled
a diagram with the parts of the rainforest labeled
a video of a nature photographer walking in a rain forest
a video of a nature photographer walking in a rain forest
a picture of ants on the rainforest floor
It is a diagram with the parts of the rainforest labeled
Gravitational potential energy is the potential energy of an object based on its.
Based on an object's separation from the Earth, gravitational energy is potential energy that can be stored there.
What is an example of gravitational energy in action?A straightforward device that converts gravitational potential energy into kinetic energy and back again is the pendulum. The bob has no kinetic energy when it is at the top of its swing, but it has a maximum gravitational potential energy. Gravitational potential energy is converted to kinetic energy as the bob swings downward, causing it to accelerate.The bob has its highest kinetic energy and lowest gravitational potential energy near the bottom of its swing.The bob's kinetic energy is converted back into gravitational potential energy as it swings higher. It again has no kinetic energy at the height of its swing, but its gravitational potential energy is at its highest.Additional examples include: water in a dam, a huge boulder perched precariously on a precipice, roller coasters, and a skateboard perched atop a ramp.To Learn more About gravitational energy refer to :
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nazi made the biggest gun, schwerer gustav. it weighed 1500 metric ton. when it shot out a projectile of 5 metric ton, it recoiled with 2.6 m/s. find the projectile speed.
the speed of the projectile is 780m/s.
given in this question,
mass of the gun m₁ =1500metric tun
as we know 1ton= 1000kg
so m₁=1,500,000kg
mass of projectile m₂= 5ton =5000kg
for solving this problem we will use the concept of conservation of momentum.
which is [tex]P_{initial}[/tex]=[tex]P_{final}[/tex]
[tex]P_{initial}[/tex]=0
and [tex]P_{final}[/tex]=m₁v₁+m₂v₂
∵v₁=2.6m/s
now by the conservation of momentum
[tex]P_{i}[/tex]=[tex]P_{f}[/tex]
0=1,500,000×2.6+5000×v₂
v₂=-1500000×2.6/5000
v₂= -780m/s
hence the value of the velocity negative is not possible
negative sign is showing direction of projectile.
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he earth's atmosphere is transparent tomost waves in thequestion options:visible part of the spectrum.infrared part of the spectrum.ultraviolet part of the spectrum.entire electromagnetic spectrum.
The earth's atmosphere is transparent to most waves is visible part of the spectrum.
What is the visible part of the spectrum?The region of the electromagnetic spectrum that the human eye can see is known as the visible light spectrum. This group of wavelengths is more commonly referred to as visible light.The range of wavelengths that the human eye can typically see is from 380 to 700 nanometers.The region of the electromagnetic spectrum that is visible to the human eye is known as the visible spectrum. This wavelength range of electromagnetic energy is referred to as visible light or just light. The ordinary human eye can see wavelengths between 380 and 750 nanometers.
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spring a is stiffer than spring b (ka > kb). the spring force of which spring does more work if the springs are compressed (a) the same distance and (b) by the same applied force?
Given that A was stiffer than B (KA > KB), the force given to both springs is the same for A, whose spring constant is higher than B's but whose expansion is smaller, and whose work will thus be less than B's.
What does physics' ideal spring look like?The equilibrium length of a perfect spring exists. When a spring is squeezed, a force pushing each end apart has a magnitude proportional to the length drop from the equilibrium length.
What is the Spring-Hooke law?Hooke aimed to show how a spring's elasticity and the forces acting on it are related. According to Hooke's Law, a spring's extension is proportional to the load placed on it. As long even as load does not exceed a material's elastic limit, a variety of materials abide by this rule.
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suppose a ship flies toward you at nearly lightspeed. in the ship's reference frame, it is 10 m long (front to back). when you measure its length, what is the result?
Its length is 6.6m.
How is length contracted defined?Length contraction is a phenomena where a moving object's length is measured to be less than it actually is.
When an object is travelling faster than the viewer, but not at the speed of light, length contraction is seen. The relativity of space and time is the cause of this. The two extremes of a moving object will send out signals like light at somewhat different intervals to an observer watching the thing.
Using the relationship between length contraction,
l = l₀[tex]\sqrt{1-\beta^{2} }[/tex]
β = v/c
l₀ = 10m
v = 0.75c
v/c = 0.75
In place of, we have
l = 10×[tex]\sqrt{1-0.75^{2} }[/tex]
l = 10× 0.66
l = 6.6m.
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what minimum height must the sides have for this boat to float in perfectly calm water? mastering physics
The height is 0.32788meters or 31.78 cm.
According to the principle of buoyancy, the weight of a floating body equals the weight of the liquid displaced by its submerged part. Therefore, the ship can float on water. Because its weight is equal to the weight of the water you are trying to displace. Each float displaces the swimming liquid by its own weight. Just like a ship floats freely in the water.
The weight of the container must equal the weight of the volume of water displaced by the container. Displacement is the amount of water a ship displaces. If the buoyancy equals the object's weight, the object will remain buoyant at the current depth. Buoyancy always exists whether an object is floating, submerged, or floating in a liquid. When the boat floats, its weight equals the weight of the volume of water displaced.
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What is the kinetic energy of a car that has a mass 2,000 kg and has a velocity of 10 m/s?
The Kinetic Energy of the given body is 100,000
Kinetic energy is the energy possessed by a body as a virtue of its motion or movement. It is defined under Mechanical energy.
The mechanical energy of a body is always conserved. Potential energy along with Kinetic energy maintains the mechanical energy of a body.
If talking solely about mechanical energy the dip in one leads to a rise in the other.
The potential energy of a body is the energy possessed by the virtue of its position in distance from the surface of the Earth.
The formula of Potential energy is=mgh
where h is the distance from the surface of the earth where the body is placed
while g is the gravitational force exerted by the earth on the body
The formula of Kinetic Energy is: 1/2xmx[tex]v^{2}[/tex]
m=2000kg (Provided in the question)
v=10m/s (Provided in the question)
Then Kinetic Energy of the body=1/2x m x [tex]v^{2}[/tex]
putting values in the equation
K.E=1/2 x 2000 x [tex]10^{2}[/tex]
K.E=1/2 x 2000 x 100
canceling 2000 by 2
K.E = 1000 x 100
K.E= 100,000
Where Kinetic energy is represented as K.E
Thus, the Kinetic Energy of the given body is 100,000
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A person rides in an elevator.
What is the equal and opposite force for the force of the elevator floor pushing up on the person as described by Newton's third law?
The equal and opposite force for the force of the elevator floor pushing up on the person as described by Newton's third law is the weight and the reaction force from its effect.
What is an Elevator?This is referred to as a device which is used in the vertical transportation of goods and people among the floors in a buildings.
When an individual steps into the elevator, the weight acts on it and it is known as a downward force while the reaction acts upward in an opposite reaction as described by Newton's third law in this scenario.
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Substances in a(n)________
separate properties.
keep their separate properties, but in a(n)___________
the parts are bonded and do not keep their
Substances in a mixture keep their separate properties, but in a compound the parts are bonded and do not keep their separate properties.
Mixtures contains elements and compounds without any fixed ratio and not by any means of chemical bonds. The elements and compounds are physically mixed and so they will be visibly distinct.
Compounds contains elements in a fixed ratio and is connected by chemical bonds. They only contain one type of molecule. Since they are chemically combined the particles appear as one and is not visibly distinct.
Therefore, substances in a mixture keep their separate properties, but in a compound the parts are bonded and do not keep their separate properties.
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a boy pushes a wheelbarrow with a force of 36 n to the left. a frictional force of 13 n opposes the motion. the wheelbarrow and its contents have a mass of 37 kg. calculate the acceleration of the wheelbarrow:
The acceleration of the wheelbarrow is 0.621 m/s^2 .
There will be equal force applied on both side, in that case the object will be having zero motion and zero acceleration.
But in the case when there is more force applied in one direction than other side force then there will be acceleration on the object.
This acceleration is equal to the ΔF/m.
where ΔF is the difference of the forces applied on the both direction
and m is the total mass of the object.
According to the question, we have m = 37Kg
ΔF = (36-13) n = 23 n
so a = 23/37 = 0.621 m/s^2
so acceleration of the wheelbarrow is 0.621 m/s^2 .
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What is the process that causes harmful materials to seep into the ground and move through rock and soil and contaminate ground water?.
What is the potential difference measured if the following voltmeter (refer to picture) is used and connected to the circuit via the 3V terminal?
The potential difference measured if the given voltmeter is used and connected to the circuit via the 3V terminal is 1.4 V.
The reading of voltmeter is taken for the row with 0, 1, 2 and 3 values. Each line indicates 0.1 volts. The distance between each smaller lines indicates 0.2 volts and the distance between each longer lines indicates 0.2 volts.
A voltmeter is a device used to measure the potential difference between two points in a circuit. Potential difference is also called as voltage. Its unit is volts.
V = IR
V = Voltage
I = Current
R = Resistance
Therefore, the potential difference measured is 1.4 V
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Determine the direction of the magnetic field of the current-carrying wire in the vicinity of the loop.
To determine the direction of the magnetic field of the current-carrying wire in the vicinity of the loop, you can use the right-hand rule.
How do you use this right-hand rule?If you're confused of what the direction of the magnetic field around a current-carrying wire is supposed to be, you can use the right-hand rule to conveniently figure out the direction. To use this right-hand rule, first curl your right-hand fingers and then point your right thumb in the direction of the current in the wire. Your right-hand fingers will be curled in the same direction as the direction of the magnetic field around the current-carrying wire.
There is another type of the right-hand rule. This type of right-hand rule is used to identify the direction of axes or parameters that point in three dimensions.
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a plane electromagnetic wave has an average power per unit area of 153 w/m2 . a flat, rectangular surface, 18.2 cm by 45.1 cm, is placed perpendicular to the direction of the plane wave. if the surface absorbs half the energy and reflects half, calculate the net energy absorbed in 1.22 min. answer in units of j.
Knowing the power of the units and the electromagnetic waves is necessary to calculate the net energy unit.
What is power?
Power is the work completed in a given amount of time or time spent working. The joules per second (J/s)-based SI power unit is the Watt (W). Horsepower (hp), roughly equal to 745.7 watts, is sometimes used to describe the power of machines like motor vehicles.
What are electromagnetic waves?
Magnetic and electric fields vibrate together to produce electromagnetic waves, also known as EM waves. In other words, oscillating magnetic and electric fields make up electromagnetic waves (EM).
P=I*A=t=E/t
E=I*A*T
I= 153W/M^2
A=18.2*45.1*10^-4
A=0.082082
t=1.22mins = 1.22*60^S
t= 73.2
applying the formula E=I*A*T
E= 919.2855j
Therefore, the net energy absorbed in 1.22 min is 919.285j.
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the current on a solenoid is 3 a, the radius of the windings are 2 m , length of the solenoid is 10m , number of windings is 100. calculate the self inductance of this solenoid.
The self inductance of a solenoid is 157.9 * [tex]10^{-4}[/tex] H
Self inductance is defined as the property of a current-carrying coil that resists or prevents the current passing through it from changing.
• It is represented by L
• The unit for the self inductance is Henry denoted by H.
• Mathematically, it is L = ц[tex]N^{2}[/tex]A / l
where
ц is the vacuum permeability = 4π * [tex]10^{-7}[/tex]
N is the number of turns of the solenoid = 100
A is the area of one loop of the solenoid = π [tex]r^{2}[/tex]
( r = 2m )
A = π [tex]r^{2}[/tex] = 4π
l is its length
So the self inductance of the solenoid will be
L = 4π * [tex]10^{-4}[/tex] * 100*100 * 4π / (10)
L = 16π² * [tex]10^{-4}[/tex] H
L = 157.9 * [tex]10^{-4}[/tex] H
The self inductance of this solenoid is 157.9 * [tex]10^{-4}[/tex] H
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How does the amount of work trevor performs going to the corner compare with the amount of work he performs coming back? they are the same because he uses the same amount of force. they are the same because he travels the same distance. he does less work coming back because the force moving the wagon is only 50cos30°. he does more work coming back because the force moving the wagon is only 50cos60°.
Answer:C) he does less work coming back because the force moving the wagon is only 50cos30
Explanation: got it right on edge
The amount of work Trevor performs going to the corner compared with the amount of work he performs coming back is that he does less work coming back because the force moving the wagon is only 50cos30°
Since the formula, we refer to for calculating the work, when the angle is applied is:
Wₓ = W cos θ, where for the case the θ is 30 and W is 50
Since the force done is parallel to the motion's direction, and the work has a larger magnitude, the work done in order of pulling the wagon back to the starting point is less than the work done in pulling the wagon to the corner, as the reason is for the angle of 30 degrees in pulling it back
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The first step in the proton-proton chain produces an antielectron, or positron. What happens to the positron?.
In the first step in the proton-proton chain, the positron gets rapidly converted to energy when it meets a standard electron, leading to matter-antimatter annihilation.
The positron is an antiparticle or antimatter counterpart of the electron. It persists an electrical charge of +1e, a spin of 1/2, and a mass identical to the mass of the electron. When a positron collides with an electron, destruction occurs. If this collision is at low energies, it leads to the production of two or more photons. They're created by radioactive decay or by the pairing of two protons at high energies.
The proton-proton chain is a nuclear fusion. The proton-proton fusion is initiated only when the kinetic energy of the proton is high enough to undergo the electrostatic repulsion.
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A heat engine operates between a source at 477°c and a sink at 25°c. If heat is supplied to the heat engine at a steady rate of 65,000 kj/min, determine the maximum power output of this heat engine.
T[tex]_{C}[/tex] = 25 + 273.15 = 298.15K
T[tex]_{H}[/tex] = 477 + 273.15 = 750.15K
And by replacing Carnot efficiency:
e = 1 - [tex]\frac{298.15}{750.15}[/tex] = 0.39475 = 39.47%
W[tex]_{max}[/tex] = e × Q[tex]_{H}[/tex] = 0.39475 × 65000[tex]\frac{KJ}{min}[/tex] = 25658.75 [tex]\frac{KJ}{min}[/tex]
How to calculate temperature?The United States (and its connected territories) and some Caribbean countries frequently use the Fahrenheit temperature scale, which bears the name of German physicist Daniel Gabriel Fahrenheit. Water freezes at 32°F and boils at 212°F according to the Fahrenheit scale (at sea level).
Nearly every other country uses the Celsius temperature scale, which was previously called centigrade before being changed for Swedish astronomer Anders Celsius. Water freezes at 0°C and boils at 100°C on the Celsius scale (at sea level).
For this case we can use the fact that the maximum thermal efficiency for a heat engine between two temperatures are given by the Carnot efficiency:
e = 1 - frac T[tex]_{C}[/tex]T[tex]_{H}[/tex]
We have on this case after convert the temperatures in kelvin this:
T[tex]_{C}[/tex] = 25 + 273.15 = 298.15K
T[tex]_{H}[/tex] = 477 + 273.15 = 750.15K
And replacing in the Carnot efficiency we got :
e = 1 - [tex]\frac{298.15}{750.15}[/tex] = 0.39475 = 39.47%
And the maximum power output on this case would be defined as:
W[tex]_{max}[/tex] = e × Q[tex]_{H}[/tex] = 0.39475 × 65000[tex]\frac{KJ}{min}[/tex] = 25658.75 [tex]\frac{KJ}{min}[/tex]
Where [tex]Q_{H}[/tex] represent the heat associated to the deposit with higher temperature
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A polar bear walks 40 meters North, then 20 meters East , then 40 meters south. The bear completes his trip in 10 seconds. what is the bear's total distance traveled ?
The total distance travelled is 100 m.
What is the total distance traveled ?We know that distance is a scalar quantity. Let us note that scalar quantities are the quantities that do not have a direction rather they do have magnitude. This is where the vector is different from the scalar quantity in physics.
Looking at this description, we are told that the polar bear walks 40 meters North, then 20 meters East , then 40 meters south. We can see that the total distance can be obtained by the addition of all the distances travelled.
Total distance travelled is; 40 + 20 + 40 = 100 m
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what would her speed be at 490 m ? (in reality, the air resistance will restrict her speed to perhaps 150 km/h .)
She will pull her ripcord 22.9 s after the dive and her speed at 490 m will be 112.66 m/s.
What is free-fall?Free fall, any motion of a object where gravity is the only force acting upon it. In the context of general relativity, where gravity is reduced to the curvature of spacetime, there are no forces acting on bodies in free fall.
For the given case,
s = ut + 1/2 at²
s = Displacement (3000 - 420 = 2580 m) it is the distance she will free fall
a = Acceleration due to gravity (9.8 m/s²)
u = Initial velocity (0 m/s)
t = Time taken
2580 = 0×t + 1/2 9.8 t²
2580 = 4.9 t²
t = 22.9 s
Now her speed at 490 m will be
v = d/t
v = speed
d = 2580 m
t = 22.9 s
v = 2580/22.9
v = 112.66 m/s
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The given question is incomplete so the complete question is as follows:
"if there were no air resistance, how long would it take a free-falling skydiver to fall from a plane at 3100 m to an altitude of 490 m , where she will pull her ripcord? what would her speed be at 490 m ? (in reality, the air resistance will restrict her speed to perhaps 150 km/h)"
A block of mass m1 = 14.4 kg is on a frictionless table to the left of a second block of mass m2 = 20.2 kg, attached by a horizontal string (see the figure below).
(a) If a horizontal force of 1.53 ✕ 102 N is exerted on the block m2 in the positive x-direction, use the system approach to find the acceleration (in m/s2) of the two blocks.
(b) What is the tension (in N) in the string connecting the blocks?
(a) The acceleration (in m/s²) of the two blocks is 4.42 m/s².
(b) The tension (in N) in the string connecting the blocks is 63.65 N.
What is the acceleration of the blocks?
The acceleration of the blocks is determined by applying Newton's second law of motion as shown below.
F(net) = ma
where;
F(net) is the net force on the blocksm is the mass of the blocksa is the acceleration of the blocksF = m₁a + m₂a
F = a(m₁ + m₂)
a = F/(m₁ + m₂)
where;
a is the common acceleration of the blocksm₁ is the mass of the first block = 14.4 kgm₂ is the mass of the second block = 20.2 kgF is the applied force on the blocks = 153 Na = (153) / (14.4 + 20.2)
a = 4.42 m/s²
The tension (in N) in the string connecting the blocks is calculated as follows;
T = m₁a
T = 14.4 x 4.42
T = 63.65 N
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