Answer:
La frecuencia que percibe el observador es 463 Hz.
Explanation:
El efecto Doppler se define como el cambio de frecuencia aparente de una onda producida por el movimiento relativo de la fuente respecto a su observador. En otras palabras, este efecto es el cambio en la frecuencia percibida de cualquier movimiento ondulatorio cuando el emisor y el receptor, u observador, se desplazan uno respecto a otro.
La siguiente expresión se considera el caso general del efecto Doppler:
[tex]f'=f*\frac{v+-vR}{v-+vE}[/tex]
Donde:
f’, f: Frecuencia percibida por el receptor y frecuencia emitida por el emisor respectivamente. Su unidad de medida en el Sistema Internacional (S.I.) es el Hertz (Hz), que es la unidad inversa del segundo (1 Hz = 1 s-1) v: Velocidad de propagación de la onda en el medio. Es constante y depende de las características del medio. En este caso se considera que la velocidad del sonido en el aire es de 340 m/s vR, vE: Velocidad del receptor y del emisor respectivamente. Su unidad de medida en el S.I. es el m/s ±, ∓:Utilizaremos el signo +:
En el numerador si el receptor se acerca al emisor
En el denominador si el emisor se aleja del receptor
Utilizaremos el signo -:
En el numerador si el receptor se aleja del emisor
En el denominador si el emisor se acerca al receptor
En este caso:
f= 480 Hzv= 340 m/svR= 12 m/s (el receptor es el observador)vE=0 (el emisor es el tren, que se encuentra en reposo)Y como el receptor se aleja del emisor, la expresión del efecto Doppler queda determinada como:
[tex]f'=480 Hz*\frac{340 m/s-12 m/s}{340 m/s-+0 m/s}[/tex]
Resolviendo se obtiene:
[tex]f'=480 Hz*\frac{340 m/s-12 m/s}{340 m/s}[/tex]
[tex]f'=480 Hz*\frac{328 m/s}{340 m/s}[/tex]
f'= 463 Hz
La frecuencia que percibe el observador es 463 Hz.
When solar energy is converted to thermal energy, how is the thermal energy used? Check all that apply.
to provide air conditioning
to cool refrigerators
to heat spaces in buildings
to heat water
Answer:
to heat spaces in buildingss
Explanation:
Harish runs on a straight path with the velocity of 16 m/s . How long distance will he cover in 2 minutes ?
Answer:
Harish went 1.92 Km in 2 minutes.
Explanation:
Harish is running at 16 m/s (Meters per second) and we need to find how far he goes in 2 minutes.
We can use this formula to calulate the distance:
m/s x time
We know that Harish is going 16m/s so let's plug that in:
16 (m/s) x time
We also should know that 2 minutes is 120 seconds - Let's plug that in too:
16 (m/s) x 120 (Seconds)
Now we calculate:
16 x 120 = 1920
Harish went 1,920 meters in 2 minutes.
Even though we have a correct answer, we can still make it easier to read by converting meters into kilometers.
1 Kilometer (Km) is equal to 1,000 meters.
All we need to do now is divide 1,920 by 1,000 and that will gove us our simplified answer of:
1.92 Km
Answer:
1.92 km
Explanation:
I will explain you:
2×60=120
we have to take 16×120=1920km bro
If a microwave oven is rated at 2400 watts and it is connected at a 120 volt
outlet, how much current does it use?
A. 2280 amps
B. 0.05 amps
C. 20 amps
D. 288,000 amps
Please answer this ASAP
Answer:
c. 20 amps.
just divide the watts by the volts
HELP!!!! WITH THIS PLSSS!!!
Answer:
i cant do your whole assignment for you man
Explanation:
Please help Solve! I need help!
Question:
Jermaine runs exactly 2 laps around a 400-meter track. What is the displacement?
Multiple choice answers (I need help I don't understand I don't know what the answer is PLEASE HELP ME):
a. 200
b. 800
c. 400
d. 0
D
Explanation
Given,
Distance covered in 1 lap = 400m
= Distance covered in 2 laps = 400 × 2
=800m
If Jermaine runs 2 whole laps, she comes back to her starting point.
So the answer is 0m
A boom is to be dropped from moving helicopter on the ground. Explain how can it hut the target ?
Answer:
A bomb that is dropped from a moving helicopter doesn't fall directly downward rather it follows the parabolic path as it were thrown horizontally from a height with certain initial velocity. Therefore, the bomb should be dropped from farther distance equal to the horizontal range before the helicopter reaches above the target.
Which of the following is true about the diameter of a circle?
A. The diameter is twice the length of the radius.
B. The diameter is twice the length of the circumference.
C. The diameter is half the length of the circumference.
D. The diameter is half the length of the radius.
Answer:
option A
Explanation:
the diameter is twice the length of the radius
hope it helps
pls match this I will mark u as brainlist ans
Answer: The items listed in the attached file is correctly matched below.
Explanation:
51.) Temperature --> ( Kelvin). This is the correct option as the standard international unit of temperature is measured in Kelvin.
52.) Needle --> ( wedge). An example of a wedge is a needle as they are simple machine designed to make work easier.
53.) Wood --> ( non - magnetic material). This is the correct option as wood can not be attracted by a magnet.
54.) Door knob--> (wheel and axle). The door knob is a type of wheel and axle as it has a wheel portion which is the knob and an axle which is the rod in the door that turns the same axis.
55.) Ramp --> (inclined plane). A ramp is an inclined plane which has a sloping surface.
56.) Like forces --> (repels each other). In an electrostatic field, two charged objects repels each other if they have like forces.
57.) Mass --> ( kilogram). This is the correct option as the standard international unit of mass is measured in kilogram.
58.) Friction --> ( oppose motion). This is correct as friction is the force that poses resistance to a moving object.
59.) Cobalt coin -->( magnetic material). This is the correct option as cobalt coin can be attracted by a magnet.
60.) Lemon crusher --> ( Class 2 lever). This is correct as the lemon (load) is at the middle of the fulcrum ( squeezer) and the effort (hand)
61.) Sew saw -->( Class 1 lever). This is correct as in first class lever type of machine, the fulcrum is in-between the load and the effort.
62.) Wheel and axle --> ( Grooved wheel with rope around)
63.) Unlike forces --> ( attracts each other). In an electrostatic field, two charged objects attracts each other if they have unlike forces ( that is, one is positive and the other is negative).
64.) Earth pulls everything towards --> (Gravitational force). This is correct as stated by Newton's law of universal gravitation. This law states that every massive particle in the universe attracts every other massive particle with a force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between them.
65.) Wedge --> (Device to split object apart). This is correct as wedge is a type of simple machine which is used to split objects apart.
Answer:
The items with their corresponding match is presented as follows;
51. Temperature ↔ Kelvin
52. Needle ↔ Wedge
53. Wood ↔ Non-magnetic material
54. Door knob ↔ Wheel and axle
55. Flange ↔ Grooved wheel with a rope around
56. Like forces ↔ Repels each other
57. Mass ↔ Kilogram
58. Friction ↔ Oppose motion
59. Cobalt coin ↔ Magnetic material
60. Lemon crusher ↔ Device to split objects apart
61. See saw ↔ Class I lever
62. Wheel and axle ↔ Class II lever
63. Unlike forces ↔ Attract each other
64. Earth pulls everything towards ↔ Gravitational force
65. Wedge ↔ Inclined plane
Explanation:
A player prefers to make high passes that lift the puck above the ice. Which stick should the
player choose?
Answer:
i dont know
Explanation:
hello
HELP ASAP THANKS
What happens to the mass of an object when the parts are rearranged?
Answer:
The law of conservation of mass is a fundamental principle of physics. According to this law, matter can be neither created nor destroyed. In other words, the mass of an object or collection of objects never changes, no matter how the parts are rearranged.
Hope it helps!!!
Answer:
their will be no change in this..
The law of conservation of mass is a fundamental principle of physics. According to this law, matter can be neither created nor destroyed. In other words, the mass of an object or collection of objects never changes, no matter how the parts are rearranged.
An object is placed on a surface. A student tries to apply various combinations of forces on the object. Which pair of forces will not move the object?
Answer:
See Explanation
Explanation:
The question is incomplete, as there are no diagrams or options to provide more information to the question.
The general explanation is as follows:
For the object not to move
(1): The forces acting on the object must opposite each other. i.e. if force A acts at the right (or positive direction), force B will act at the left (or negative direction).
(2) The two forces must be equal.
So, for instance:
If the pair of forces are 5N and 5N in opposite directions, the object wil not move.
However, if one of the forces is greater, the object will move towards the direction of the greater force.
Q11) If you were standing at the top of a building and you dropped a rock.
you noticed that the rock took 5.2 s to hit the ground. Find the total
distance the rock traveled and the speed when the rock hit the ground.
Answer:
Part A
The distance travel by the rock is approximately 132.496 m
Part B
The speed when the rock hits the ground is approximately 50.96 m/s
Explanation:
Part A
The question is focused on the kinetics equation of a free falling object
The given parameter is the time it takes the rock to hit the ground, t = 5.2 s
For an object in free fall, we have;
h = 1/2·g·t²
Where;
h = The height from which the object is dropped
g = The acceleration due to gravity ≈ 9.8 m/s²
t = The time taken to travel the distance, h = 5.2 s
∴ h = 1/2 × 9.8 m/s² × (5.2 s)² ≈ 132.496 m
The distance travel by the rock, h ≈ 132.496 m
Part B
The speed, 'v', when the rock hits the ground, is given by the following kinematic equation,
v = g·t
∴ v = 9.8 m/s² × 5.2 s = 50.96 m/s
The speed when the rock hits the ground, v ≈ 50.96 m/s.
__________ is the
process by which populations change over
time.
Evolution, is a process that results in changes in the genetic material of a population over time.
At which point on this graph do reactants begin to produce products as they collide?
Answer:b
Explanation:
i just did the quiz i was look for it too then got it
The point on this graph do reactants begin to produce products as they collide is B.
What is chemical reaction?The chemical reaction is the reaction between two reactants which led to the formation of products.
The products are substances which forms after reaction. The reactants are the substances which are original materials.
This graph shows how the reactants are reacted and products are formed in a chemical reaction.
As the reaction proceeds, the potential energy is higher when reactants begin to produce products.
Thus, the point on this graph do reactants begin to produce products as they collide is B.
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1. If you add air to a flat tire through a single small entry hole, why does the air spread out to fill the tire?
Answer:
The tire fills up just like anything else that holds air when u pump a ball or tire up it fills all the way up cause it is a small confined space and after filling it with air the atoms of the air fill the tire up
Explanation:
Imagine driving down the road and you suddenly doubled your velocity. What then happens to your overall kinetic energy?
it is halved
it remains unaffected
it is doubled
it is quadrupled
How much thermal energy is absorbed when 145 g of water at 23ºC is heated until it boils and turns into vapour?
Answer:
the thermal energy absorbed is 46,893 J
Explanation:
Given;
mass of the water, m = 145 g = 0.145 kg
initial temperature of the water, t₁ = 23 ⁰C
final temperature of the water, t₂ = 100 ⁰C
specific heat capacity of water, c = 4,200 J/kg.⁰C
The thermal energy absorbed is calculated as;
H = mcΔt
H = 0.145 x 4,200 x (100 - 23)
H = 46,893J
Therefore, the thermal energy absorbed is 46,893J
whenever velocity increases the kinetic energy will ?
Answer:
It will increase.
Explanation:
Because kinetic energy is proportional to the square of the velocity, when velocity is doubled, kinetic energy is quadrupled. Kinetic energy K=mv^2/2
What would be the wavelength of the sound
when it travels through the concreate wall
with the frequency of 4500 hertz?
Answer: 0,96 m
Explanation: speed in concrete is 4300 m/s
According to wave equation speed v = lambda × frequency
Lambda = speed /frequency
more mass an object has _____ its gravitational force. HHHHHHHHHHHHHHHHHHHHHHEEEEEEEEEEEEEEEELLLLLLLLLLPPPPPPPPPPP
I think the word would be increases. I don't know what the options are though.
...he...
2- A diver on Saturn's moon Titan is 50 m below the surface of a lake of liquid
methane.
(a) what is the increase in pressure on him due to his depth in the methane? The
density of liquid is 420 kg/m3. the gravitational field on Titan is 1.4 N/kg.
[2]
(6) we are told that the pressure of the atmosphere on Titan is 1600 mbar. What is
the total pressure on the diver (in kPa)
[2]
Se calienta para templar y endurecer, una llave española de acero de 200 gramos, elevando su temperatura hasta los 550°C y se introduce dentro de un recipiente de aluminio de 250 gramos de masa que contiene 220 gramos de agua. A 18°C. Determinar la temperatura final, cuando se alcanza el equilibrio térmico. Considere El CeHierro= 0.499cal/g°C; CeAluminio= 0.217cal/g°C; Ce agua=1cal/g°C
Answer:
La temperatura final es de aproximadamente 159,94°C
Explanation:
Los parámetros dados son;
La masa de la llave española de acero, m₁ = 200 gramos
La temperatura de la llave, T₁ = 550 ° C
La masa del recipiente de aluminio que contiene agua, m₂ = 250 gramos
La masa del agua en el recipiente de aluminio, m₃ = 220 gramos
La capacidad calorífica específica del hierro, [tex]C_{planchar}[/tex], c₁ = 0.499 ca/(g·°C)
La capacidad calorífica específica del aluminio, [tex]C_{Aluminio}[/tex], c₂ = 0.217 cal/(g·°C)
La capacidad calorífica específica del agua, [tex]C_{Agua}[/tex], c₃= 1 cal/(g·°C)
En equilibrio térmico, tenemos;
m₁·c₁·(T₁ - T) = m₂·c₂·(T -T₂) + m₃·c₃·(T - T₂)
Conectando los valores, da;
200 × 0.499 × (550 - T) = 250 × 0.217 × (T -18) + 220 × 1 × (T - 18)
Simplificando, usando una calculadora gráfica, obtenemos;
[tex]\dfrac{274450-499\cdot T}{5} = \dfrac{1097 \cdot T-19746}{4}[/tex]
De también encontramos 'T' al convertirlo en el tema de la ecuación anterior aún usando una calculadora gráfica;
T = 1196530/7481 °C ≈ 159.94°C
La temperatura final,T ≈ 159.94°C.
The final temperature, when thermal equilibrium is reached is 144°C.
Given the following data:
Mass of key = 200 gramsFinal temperature of key = 550°CMass of aluminum = 250 gramsMass of water = 220 gramsInitial temperature of water = 18°CSpecific heat capacity of key = 0.499 cal/g°CSpecific heat capacity of aluminum = 0.217 cal/g°CSpecific heat capacity of water = 1 cal/g°CTo determine the final temperature, when thermal equilibrium is reached:
Mathematically, heat capacity or quantity of heat is given by the formula;
[tex]Q = mc\theta[/tex]
Where:
Q represents the quantity of heat.m represents the mass of an object.c represents the specific heat capacity.∅ represents the change in temperature.At an equilibrium state, the quantity of heat for the three substances is given by the equation:
[tex]M_kC_k(\theta_2 - \theta_1) = M_aC_a(\theta_2 - \theta_1) + M_wC_w(\theta_2 - \theta_1)\\\\200 \times 0.499 \times (500 - \theta_2) = 250 \times 0.217 \times (\theta_2 - 18) + 220 \times 1 \times (\theta_2 - 18)\\\\99.8(500 - \theta_2) = 54.25(\theta_2 - 18) + 220(\theta_2 - 18)\\\\49900 -99.8\theta_2 = 54.25\theta_2 - 976.5 + 220\theta_2 - 3960\\\\220\theta_2 + 99.8\theta_2 + 54.25\theta_2 = 49900 + 3960\\\\374.05\theta_2 = 53860\\\\\theta_2 = \frac{53860}{374.05}[/tex]
Final temperature, [tex]\theta_2[/tex] = 143.99 ≈ 144°C
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2 kg
T2
5 kg
2.1.1 State Newton's Second Law of Motion in words.
.1.2 Draw a labelled free body diagram for the 2 kg mass.
1.3 Determine the magnitude of the tension force T2.
1.4 Calculate the magnitude of the normal force exerted on the 2 kg mass,
Answer:
2500 and kg its is very easy do with method
In which situation is there NO work being done?
Answer:
d
Explanation:
Using the correct IUPAC nomenclature, what is the correct name, formula,
and classification of a compound that contains two nitrogen atoms and one
oxygen atom?
O A. Mononitrogen dioxide, N20, covalent compound.
B. Nitrogen dioxide, NO2, ionic compound.
O C. Dinitrogen monoxide, N20, covalent compound.
D. Nitrogen oxide, No, ionic compound.
Answer: C is right
Explanation:
N and O are no-metals and forms covalent bonds.
Usually they need a. Prefix whic tells number of atoms in compound
In one experiment, the teacher determined that the force on the wire was 2.14 mN
The current in the wire was 0.32 A
The length of wire within the magnetic field was 0.048 m
Calculate the magnetic flux density between the two magnets.
Use the Physics Equations Sheet.
Give your answer to 2 significant figures.
Answer:
in ine experiment the teacher determined
Ocean breezes are due to which method of heat transfer?
A. conduction
B. convection
C. greenhouse gases
D. radiation
E. geothermal energy
Ocean breezes are primarily due to convection, which is the transfer of heat through the movement of fluids or gases. The correct option is B.
What is convection?Convection is a method of heat transfer that occurs in fluids (liquids and gases) and involves the movement of material carrying thermal energy. In convection, heat is transferred by the movement of hot fluid from one place to another, which then causes the transfer of heat from the hot fluid to the cooler fluid or surface it comes into contact with.
Convection can occur in two ways:
Natural convection: It occurs due to the density differences caused by temperature variations within a fluid. When a fluid is heated, its density decreases, making it lighter and causing it to rise. As it rises, it cools, becomes denser and falls back down, creating a cycle that is known as a convection current.
Forced convection: In this type of convection, a fluid is forced to flow over a surface or through a channel, by an external agent like a fan or pump. The forced flow enhances the rate of heat transfer from the surface or through the channel, as compared to natural convection, where the fluid flow is driven only by buoyancy forces.
Convection is a very important process for heat transfer in many natural and industrial applications, including heating and cooling systems, meteorology, oceanography, and more.
Here in the Question,
Ocean breezes are primarily due to convection, which is the transfer of heat through the movement of fluids or gases. As the sun heats up the surface of the ocean, the air above it also heats up and rises. This creates a low pressure area that draws in cooler air from over the land, resulting in a breeze that blows from the ocean towards the shore. This is why sea breezes are generally felt during the day, when the land is warmer than the sea, and why they tend to die down at night, when the opposite occurs.
Therefore, The correct answer is B i.e convection.
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what is virtual image
Answer:
Virtual images are images that are formed in locations where light does not actually reach. Light does not actually pass through the location on the other side of the mirror; it only appears to an observer as though the light is coming from this location.
Explanation:
Which stretch focuses on stretching the glutes and hamstrings while laying on your back?
Question 4 options:
Knee to hip
Bent knee
Knee to Chest
Chest flies
tyyyyyyyy
Answer:
knee to chest
Explanation:
I took the test
Answer:
C. Knee to chest.
There is concern that extra additives in detergents can
have negative health and environmental impacts. Is
it wise to use detergents containing these additives?
Answer:
Look below.
Explanation:
If additives are having negative effects on health and the environment, it would be wise to not use detergents containing these additives. These additives could threaten living things such as humans and animals.
There is concern that extra additives in detergents can have negative health and environmental impacts, then it would be very unwise to use detergents containing these additives
What is pollution?It can be defined as the origination of the contaminant substance that poisonous or harmful to our natural environment.
There are several types of pollution that exist in our nature depending on the state and composition of the contaminant, for example, water pollution can exist due to the eutrophication process.
It would be quite unwise to use surfactants that include these additional ingredients since there is fear that they might have a harmful influence on your well-being and the environment.
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