Answer:
The Stefan–Boltzmann law, also known as Stefan's law, states that the total energy radiated per unit surface area of a black body in unit time (known variously as the black-body irradiance, energy flux density, radiant flux, or the emissive power), j*, is directly proportional to the fourth power of the black body's
Explanation:
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A puppy finds a rawhide bone and begins to pull it with a force, Ft. The free-body diagram is shown.
Which describes what happens to the bone?
Answer:
it begins to move to the right! :)
If he jumps from the plane with a velocity of +2 ft/s and, after 7 seconds of free fall, he has a velocity of -223ft/s, what is his displacement?
Answer:
his displacement is 772.85 ft
Explanation:
Given;
initial velocity of his jump, u = 2 ft/s
final velocity of his jump, v = - 223 ft/s
time of motion, t = 7 seconds
acceleration due to gravity, g = 32.17 ft/s²
Let downward motion = positive direction
Let his displacement after 7s = Δh
Apply the following kinematic equation to determine his displacement.
[tex]v^2 = u^2 + 2g\Delta h\\\\(-223)^2 = (2)^2 + (2\times 32.17)\Delta h\\\\49,729 = 4 + 64.34\Delta h\\\\-64.34 \Delta h = 4 - 49,729\\\\-64.34 \Delta h = -49,725\\\\\Delta h = \frac{49,725}{64.34} \\\\\Delta h = 772.85 \ ft[/tex]
Therefore, his displacement is 772.85 ft
when we put our finger in front a a lit flashlight, light appears to pass through our finger when seen on a wall,how?
Answer:
diffraction phenomenon
Explanation:
When you place your finger in front of a flash, you have a diffraction phenomenon whereby the light fills a part of the space with the first maximum diffraction.
In this case the phenomenon of geometric optics cannot explain the process of bending the beam around an object.
what is uniform motion?
On a sunny day, the concrete at the side of the pool feels much hotter than the water even though both have received the same thermal energy from the sun. explain fully why the concrete is hotter? (2)
Answer:
Because the concrete is metal and get hot fast
explain the working principle of the moving coil coil galvanometer
Answer:
When a current-carrying coil is suspended in a uniform magnetic field it is acted upon by a torque. Under the action of this torque, the coil rotates and the deflection in the coil in a moving coil galvanometer is directly proportional to the current flowing through the coil.
Which statements describe acceleration? Check all that apply. Negative acceleration occurs when an object slows down in the positive direction. Negative acceleration occurs when an object slows down in the negative direction. Negative acceleration occurs when an object speeds up in the negative direction. Positive acceleration occurs when an object speeds up in the positive direction. Positive acceleration occurs when an object speeds up in the negative direction. Positive acceleration occurs when an object slows down in the negative direction
Answer:
Negative acceleration occurs when the acceleration vector points to the left.
1. Object slowing down in the positive direction.
2. Object speeding up in the negative direction.
Following six statements:
1. T
2. F
3. T
4. T
5. F
6. T
Check direction of acceleration vector.
Phecda has a surface temperature of approximately 9500 K and a luminosity of 63. Identify the name of the star found on the Characteristics of Stars chart in the 2011 Edition Reference Tables for Physical Setting/Earth Science that has a surface temperature and luminosity closest to Phecda. a) Deneb b) Rigel c) Sirius d) Pollux
Answer:
Sirius
Explanation:
On the HR diagram Sirius is the closet.
c) Sirius has a surface temperature and luminosity closest to Phecda
What is surface tension and luminosity of a star ?
Surface temperature is the temperature at or near a surface. Luminosity is an absolute measure of radiated electromagnetic power (light), the radiant power emitted by a light-emitting object over time.
As it can be observed from the graph attached that Sirius have a surface temperature of about 10,000 K which can be considered as closest to 9500 K comparatively to other stars and if we see the the y coordinate of Sirius which is the luminosity representing axis , then Sirius have a value of luminosity closer to 63
hence correct answer is c)Sirius
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This wave, in total, is 30m. What is it's wavelength? *
Your answer
wavelength = d / number of Oscillation
this implies that wavelength = 30/3= 10
number of wavelengths = 10
Answer:
Looking at the wave diagram
Its wavelength 3full wavelength which total to 30m...
So
3y = 30
y= 30/3
y=10meters
So a single wavelength is 10m.
Hope it helps
• ¿Qué rapidez tendrá un sonido de 150 Hz con una longitud de onda de 2 metros?
Answer:
Speed = 300 m/s
Explanation:
Given the following data;
Frequency = 150 Hz
Wavelength = 2 meters
To find the speed of the wave;
Mathematically, the speed of a wave is given by the formula:
[tex] Speed = wavelength * frequency [/tex]
Substituting into the formula, we have;
[tex] Speed = 2 * 150[/tex]
Speed = 300 m/s
PLEASE HELP ME!
1. Figure 5.20 shows a graph of displacement against time for a wave.
(a) What is meant by amplitude?
(b) Determine the period of oscillation, T. Then, calculate the frequency of oscillation.
2. Compare and contrast progressive wave and stationary wave.
Answer:
a) A = 3 cm, b) T = 0.4 s, f = 2.5 Hz,
2) A standing wave the displacement of the wave is canceled and only one oscillation remains
Explanation:
a) in an oscillatory movement the amplitude is the highest value of the signal in this case
A = 3 cm
b) the period of oscillation is the time it takes for the wave to repeat itself in this case
T = 0.4 s
the period is the inverse of the frequency
f = 1 /T
f = 1 /, 0.4
f = 2.5 Hz
2) a traveling wave is a wave for which as time increases the displacement increases, in the case of a transverse wave the oscillation is perpendicular to the displacement and in the case of a longitudinal wave the oscillation is in the same direction of the displacement.
A standing wave occurs when a traveling wave bounces off some object and there are two waves, one that travels in one direction and the other that travels in the opposite direction. In this case, the displacement of the wave is canceled and only one oscillation remains.
If two opposing forces are equal, then the net force is 0 N.
true or false?
Answer:
false
Explanation:
Suggest two ways in which the boy could balance the beam?
Answer:
Hope this is what you were looking for!
Explanation:
1) So, if we are talking about balancing a straight stick (beam), he could put a finger from each hand on either side of it and move them together. As a result of friction his fingers will meet at the balance point.
2) Method of trial and error.
How is the mirror angle related to the angles of incidence and reflection?
Answer:
mirror angle is related to sngle of incident n reflection becuse they are ewaul to each other
The lower the pH number is, the more ______ the solution.
Answer:
more acidic (less base)
hope this helps! :)
Resistance is equal to the potential difference divided by what? Give the name, not the unit of
measurement
We have that Resistance is equal to the potential difference divided by
Current
The Name of the Quantity is Current
From the question we are told
Resistance is equal to the potential difference divided by what? Give the name, not the unit of measurement
Generally the equation for Resistance is mathematically given as
[tex]R=\frac{V}{I}[/tex]
Where
I=Current
V=Voltage
R=Resistance
Therefore
Resistance is equal to the potential difference divided by
Current
The Name of the Quantity is Current
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The process of converting a solid into gaseous state is called
True or False: Sound waves are the longest wave lengths on the electromagnetic spectrum.
Answer:
False: Wave lengths on the electromagnetic spectrum are "electromagnetic",
They are transverse waves,
Sound waves are "longitudinal" waves and depend on the motion of the medium of transmission for propagation.
desde lo alto de una antena de telefono se lanza una peloota de tenis, la antena mide 150 metros. se mide el alcance horizontal y cae a unos 70 metros de su base. Calcular: a)La velocidad horizontal inicial con a que fue lanzada la pelota. b) La velocidad vertical con la cual llega la pelota al piso
Explanation:
las respuestas están en la foto de arriba
a student places 8 similar coins in a pile . the height of the pile of coins is 2.4 cm calculate the average thickness of one coin
Answer:
0.3 cm
Explanation:
[tex] \frac{2.4}{8} \\ = 0.3[/tex]
Balance the equation-
Al+Mn02 ———-> Mn + Al2O3
Answer:
4Al + 3Mno2 --> 2Al2o3 + 3Mn
Explanation:
Al = 1 x 4 = 4
Mn = 1 x 3 = 3
O = 2 x 3 = 6
----------
Al = 2 x 2 = 4
Mn = 1 x 3 = 3
O = 2 x 3 = 6
what should you do to change a value in SI units in U.S customary units
Answer:
To convert values expressed in SI unit to the other unit divide the SI unit by the value in the Multiply By column.
Explanation:
UN ELEVADOR DE TALLER TIENE PISTONES DE ENTRADA Y DE SALIDA , CON DIAMETRO DE 15 cm Y 40 cm RESPECTIVAMENTE, SE USA EL ELEVADOR PARA MANTENER LEVANTADO UN CARRO QUE PESA 1.4 X104 NEWTON . ENCUENTRE: A) ¿QUE FUERZA SE APLICA AL PISTON DE ENTRADA? B) QUE PRESION SE APLICA AL PISTON DE ENTRADA? *
Answer:
a) La fuerza que se aplica al pistón de entrada tiene una magnitud de 1968.75 newtons.
b) La presión que se aplica al pistón de entrada es de 111408.460 pascales.
Explanation:
a) Este problema se resuelve mediante el Principio de Pascal, el cual establece que la presión dentro de un sistema hidráulico cerrado es la misma en cualquiera de sus puntos. Por tanto, podemos calcular la fuerza aplicada al pistón de entrada mediante la siguiente relación:
[tex]\frac{F_{in}}{\frac{\pi}{4}\cdot D_{in}^{2}} = \frac{M\cdot g}{\frac{\pi}{4}\cdot D_{out}^{2} }[/tex]
[tex]F_{in} = \left(\frac{D_{in}}{D_{out}} \right)^{2}\cdot M\cdot g[/tex] (1)
Where:
[tex]F_{in}[/tex] - Fuerza aplicada al pistón de entrada, en newtons.
[tex]D_{in}[/tex] - Diámetro del pistón de entrada, en metros.
[tex]D_{out}[/tex] - Diámetro del pistón de salida, en metros.
[tex]M\cdot g[/tex] - Peso del carro, en newtons.
Si sabemos que [tex]D_{in} = 0.15\,m[/tex], [tex]D_{out} = 0.40\,m[/tex] y [tex]M\cdot g = 1.4\times 10^{4}\,N[/tex], entonces la fuerza aplicada al pistón de entrada es:
[tex]F_{in} = \left(\frac{0.15\,m}{0.40\,m} \right)^{2}\cdot (1.4\times 10^{4}\,N)[/tex]
[tex]F_{in} = 1968.75\,N[/tex]
La fuerza que se aplica al pistón de entrada tiene una magnitud de 1968.75 newtons.
b) Ahora, presión aplicada al pistón de entrada ([tex]p[/tex]), en pascales, queda descrita a través de la siguiente expresión:
[tex]p = \frac{F_{in}}{\frac{\pi}{4}\cdot D_{in}^{2} }[/tex] (2)
Si sabemos que [tex]F_{in} = 1968.75\,N[/tex] y [tex]D_{in} = 0.15\,m[/tex], entonces la presión aplicada al pistón de entrada es:
[tex]p = \frac{1968.75\,N}{\frac{\pi}{4}\cdot (0.15\,m)^{2} }[/tex]
[tex]p = 111408.460\,Pa[/tex]
La presión que se aplica al pistón de entrada es de 111408.460 pascales.
A construction worker drops a 2.20 kg hammer from a roof. At a distance of 4.50 m above the ground, the hammer's total mechanical energy is 188 J. Calculate the kinetic energy of the hammer at this height.
Answer:
Kinetic energy = 90.98 J
Explanation:
Given that,
The mass of a hammer, m = 2.2 kg
At a distance of 4.50 m above the ground, the hammer's total mechanical energy is 188 J.
We need to find the kinetic energy of the hammer at this height.
We know that,
Mechanical energy = kinetic energy + potential energy
[tex]188=K_E+mgh\\\\K_E=188-mgh\\\\K_E=188-2.2\times 9.8\times 4.5\\\\K_E=90.98\ J[/tex]
So, the kinetic energy of the hammer at this height is equal to 90.98 J.
Con respecto a las magnitudes longitud del péndulo y periodo, ¿por qué la línea de mejor ajuste de los puntos-dato de la distribución indica que sí hay relación entre ambas magnitudes?
Answer:
Por que existe una relación entre dichas magnitudes.
Para un pendulo perfecto de largo L, sabemos que el periodo esta definido como:
[tex]T = 2*\pi *\sqrt{L/g}[/tex]
Donde:
pi = 3.14
L = largo del péndulo
g = aceleración gravitatoria = 9.8 m/s^2
Entonces podemos ver que el periodo es proporcional a la raíz cuadrada de la longitud del péndulo.
Esto es por lo que al analizar datos de un experimento se debería observar una relación entre esas magnitudes.
Explain the working of thermos flask in simple and easy words
Answer:
a thermos is designed to keep hot things hot by not allowing heat to escape.
Explanation:
A thermos is a bottle with a double-walled container inside of it. The air between the two walls is sucked out during construction, creating a vacuum.
17. What is the gain in gravitational potential energy of a body of weight 2000 N as it rises from a height of 20 m to a height of 25 m above the earth's surface?
(A) 400 J
(B) 1 000 J
(C) 10 000 J
(D) 20 000 J
Answer:
C) 10000 J
Explanation:
∆p.e =mg∆h
= 2000 × 5
= 10000J
If the distance between two objects is increased to four times the original distance.how will that increase change the force of attraction between the object
Answer:
Gravitational force becomes sixteen times lesser. The strength of the gravitational force between two objects is dependent on their mass. Gravitational force will be weaker if the objects move further away from each other.
This was used to solve for the gravitational force,
G = gravitational constant
m = mass of the first object
M = mass of the second object
d = distance between the two objects
[G * (m*M) / 16d^2] = 1/16
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Answer:
Cannot see all the answer choices but, when pressure goes up, volume goes down. So your best bet is to choose the graph that has a downward slant.
Explanation:
What is one disadvantage of using nuclear fission to produce electricity?
A. It is difficult to store and dispose of radioactive wastes.
B. It produces only a small amount of energy.
C. It requires very high temperatures and pressures.
D. It has a limited supply of fuel.
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