Answer:
please mark me as a brainleast
Explanation:
1.eneegy can change from ome form to another
2.) A red star is 55 solar radii and a white star is 52 solar radii. Which star will 1 point
appear brighter in the night sky?*
Answer:white star
Explanation:
There are changes in the amounts of different energy recorded used between 2014 and 2015 explain the environmental impacts of the changes
Calculate the mass number of an atom with 8 protons, 12 neutrons and 10 electrons
Answer: 20
Explanation: Mass number is the number of neutrons plus the number of protons. 8 + 12 gives 20.
Mass number
No of protons+No of neutrons12+820Mass number is 20
All objects on earth experience a force of gravity that pulls objects "downward" towards the center of the earth. The force of gravity acting on a person is 1000 N down and the force of air resistance is 215 N up. Find the net force.
Answer:
The net force is 785 N
Explanation:
The net force = Force in one direction - force in the opposite direction
Here the Downward force due to gravity = 1000N
and the Upward force of air = 215 N
The net force = Downward force due to gravity -Upward force of air
Substituting the given values, we get -
The net force = 1000 -215 = 785 N
Hence, the net force is 785 N
Answer:
I am in 8th grade, and I am learning this, and it is kinda hard, but I appreciate all these people helping people answer thee hard science problems
I need help?? Plz help me
Answer:
12. b
13. a
Explanation:
Demuestre que la función de onda: y(x, t) = A e^−i(kx−ωt+φ) satisface la ecuación de onda lineal. (donde i =√−1).
Answer:
La ecuación de onda lineal para una función f(x, t) se escribe como:
[tex]\frac{d^2f}{dt^2} = c^2*\frac{d^2f}{dx^2}[/tex]
Donde c es una constante que depende de la velocidad de propagación de la onda.
En este caso, tenemos:
[tex]f(x) = A*e^{-i*(k*x - w*t + \phi)}[/tex]
Recordar que la derivada de la exponente es tal que:
[tex]k(x,y) = A*e^{c*x + n*y}\\dk/dx = c*A*e^{c*x + n*y}[/tex]
Entonces las derivadas de f van a ser:
[tex]\frac{df}{dt} = (i*w)*f(x)[/tex]
[tex]\frac{d^2f}{dt^2} = (i*w)^2*f(x) = -(w)^2*f(x)[/tex]
[tex]\frac{df}{dx} = (-i*k)*f(x)[/tex]
[tex]\frac{d^2f}{dx^2} = (-i*k)^2*f(x) = -k^2*f(x)[/tex]
Entonces podemos reescribir la ecuación de onda como:
[tex]\frac{d^2f}{dt^2} = c^2*\frac{d^2f}{dx^2}[/tex]
[tex]-(w)^2*f(x) = c^2*(-k^2*f(x))[/tex]
Ahora podemos simplemente definir c^2 = (w/k)^2 y vemos que la ecuación de onda se cumple.
5. Which energy transformation would friction
cause on a moving train?
A. kinetic energy into thermal energy
B. potential energy into sound energy
C. kinetic energy into potential energy
D. thermal energy into potential energy
Answer:
Fossil fuels store energy from the sun as
Explanation:
Blue light bends more than red light when it passes through glass. Thus, blue light has a greater
A. angle of refraction
B. interference pattern
C. index of refraction
E. wavelength
Answer:
I think c is the correct answer
Answer: C
Explanation:
When a star like our sun runs out of nuclear fuel, it collapses to a white dwarf star the size of the Earth, but with the same mass the star had before the collapse. If a star initially rotates once every 25 days, like our sun, what will its rotation rate be after it becomes a dwarf
Answer:
T = 1.8 10² s
Explanation:
This is an exercise of conservation of angular momentum,
Initial instant. Before collapsing
L₀ = I₀ w₀
Final moment. After the collapse
L_f = I w
as the system is isolated, the moment is conserved
L₀ = L_f
I₀ w₀ = I w
w = [tex]\frac{I_o}{I} \ w_o[/tex]
indicates that the rotation period is 25 day, let's reduce to the SI system
T = 25 day (24 h / 1 day) (3600 s / 1 h) = 2.16 10⁶ s
Angular velocity and period are related
w = 2π/ T
The moment of inertia of a sphere is
I = 2/5 M R ²
in this case the moment before and after the collapse is
I₀ = 2/5 M R₀²
I = 2.5 M R²
the radius of a star like the sun is
R₀ = 6.96 10⁸ m
the radius of the earth
R = 6.371 10⁶ m
we substitute
w = [tex]\frac{I_o}{I} \ w_o[/tex]
[tex]\frac{2\pi }{T} =( \frac{R_o}{R} )^2 \ \frac{2\pi }{T_o}[/tex]
T = ([tex]\frac{R}{R_o}[/tex] )² T₀
let's calculate
T = (6.371 10⁶ / 6.96 10⁸ )² 2.16 10⁶
T = 1.8 10² s
Which calculates the intensity of an electric field at a point where a 0.50 C charge experiences a force of 20. N?
Answer: [tex]40\ N/C[/tex]
Explanation:
Given
Magnitude of charge is [tex]q=0.5\ C[/tex]
Force experienced is [tex]F=20\ N[/tex]
Electric field intensity is the electrostatic force per unit charge
[tex]\therefore E=\dfrac{F}{q}\\\\\Rightarrow E=\dfrac{20}{0.50}\\\\\Rightarrow E=40\ N/C[/tex]
Thus, the electric field intensity is [tex]40\ N/C[/tex]
laser with wavelength 633 nm illuminates a single slit of width 0.185 mm. The diffraction pattern is seen on a screen. The distance between the first and second dark fringes is 8.25 mm. How far is the screen from the slit
Complex matching suggests that individuals who have formed a relationship may differ predominantly in the area of __________.
Answer:
physical attractiveness
Explanation:
A rock is thrown down from the top of a cliff with a velocity of 3.61 m/s (down). The cliff is 28.4 m above the ground. Determine the velocity of the rock just before it hits the ground.
The velocity of the rock just before it hits the ground is approximately 23.87m/s.
What is the velocity of the rock just before it hits the ground?From the third equation of motion;
v² = u² + 2gs
Where u is initial velocity, v is final velocity, g is acceleration due to gravity ( g = 9.8m/s² ) and s is distance covered.
Given the data in the question;
Initial velocity u = 3.61m/sHeight of cliff s = 28.4mFinal velocity v = ?To determine the final velocity, plug the given values into the equation of motion above.
v² = u² + 2gs
v² = ( 3.61m/s )² + ( 2 × 9.8m/s² × 28.4m )
v² = 13.0321m²/s² + 556.64m²/s²
v² = 569.6721m²/s²
v = √( 569.6721m²/s²)
v = 23.87m/s
Therefore, the final velocity of the object is 23.87m/s.
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Do metals that react vigorously with hydrochloride acid also react vigorously with sulfuric acid?
Answer:
yes
Explanation:
Reactions of acids with metals
Acids react with most metals and, when they do, a salt is produced. But unlike the reaction between acids and bases, we do not get water. Instead we get hydrogen gas.
This is the general word equation for the reaction:
metal + acid → salt + hydrogen
For example, magnesium reacts with hydrochloric acid to produce magnesium chloride:
magnesium + hydrochloric acid → magnesium chloride + hydrogen
Mg + 2HCl → MgCl2 + H2
It doesn't matter which metal or which acid is used, if there is a reaction we always get hydrogen gas as well as the salt. However, how quickly the reaction goes depends on the metal used and how high up in the reactivity series it is.
Who knows the answers to this’s problems
Answer:1. High Intensity Interval Training
HIIT stands for High Intensity Interval Training. HIIT is essentially a type of exercise, be it cardio or resistance training. HIIT. alternates between periods of high intensity, and low intensity (or recovery
2. flexibility and muscular strength
3. true
4. d
5. c
Explanation:
From the given υ – t graph, it can be inferred that the object is
a) in uniform motion
(b) at rest
(c) in non-uniform motion
(d) moving with uniform acceleration
no spam answers please!
Answer:
a) in uniform motion
Explanation:
When velocity-time graph is parallel to x-axis, it shows that the object is moving with constant velocity. or we can say that that the object is moving with uniform motion. There is no change in velocity. It covere equal distance in equal intervals of time.
Hence, the correct option is (a) "in uniform motion".
What is total internal reflection?
Answer:
When a ray of light, passes from a denser to a rarer medium with the angle of incidence greater than the critical angle, the ray is reflected back into the same medium. This phenomenon is call total internal reflection.
After hearing about an accident on his normal route, Mr. Gujral checks for alternate routes to get to work. What type of circuit does this traffic situation model?
Answer:
C
Explanation:
a parallel circuit because there is more than one path
Answer:
C) a parallel circuit because there is more than one path
Explanation:
EDGE 2022
Put these components from largest to smallest
1. comet
2. star
3. galaxy
4. nebula
5. planet
6. universe
Answer:
6, 3, 2, 5, 4, 1
Explanation:
Let's describe them from smallest to largest. In fact the size order is not exact as there are exceptions.
An asteroid is a rocky body which lies in the asteroid belt between Mars and Jupiter. They are typically quite small object. The largest asteroid Ceres has been reclassified as a dwarf planet.
A moon is typically a rocky body which is in orbit around a planet. Some moons such as our Moon are quite large and are typically bigger than asteroid. Some moons can actually be smaller than some asteroids.
A planet is a nearly spherical body which is in orbit around the Sun. Planets are larger than moons.
A star is what planets orbit around. It is the source of light and heat. Our Sun is a star which is many times bigger than all of the planets.
A solar system is a star and all of its planets, asteroids, comets and other bodies. It is significantly bigger than a star.
A galaxy, such as our Milky Way Galaxy, is a collection of solar systems orbiting around a central core. Most galaxies have a supermassive black hole at their centres.
Galaxies also form clusters which are large scale structures.
The universe is everything. It contains billions of galaxies.
what energy is required to remove the electron from a hydrogen atom in the n=11 state? Let the constant hcR=13.6
A) 0.11 eV
B) 0.080 eV
C) 0.094 eV
D) 0.14 eV
E) 0.17 eV
Answer:
the answer is letter A im not sure
Can anyone help me please?
Answer:
four times the
Explanation:
...........
Your family is on a vacation at the coast and is spending the day at the beach. Your brothers are setting up the umbrellas and beach chairs for the day. You notice that since the tide is low, they are setting everything up close to the water’s edge. Is this a good idea? Explain.
The diagram shows the electric field near conducting sphere a which of the following statements is correct
What happens when a wave enters a different material and slows down?
Answer: Refraction
Explanation: When a light wave hits a glass of water the wave bends to make it look side ways
A student pulled a 100 kg cart up a ramp using a force of 150 N. By the time the cart reached the top of the ramp, it had gained 980 joules of potential energy. What happened to the work the student did by pulling the cart?
Answer:
Some of the work done on the cart became the cart’s potential energy, and some of the work was converted into heat by friction.
Explanation:
Here, some fraction of the work done by the student on the cart is converted to the potential energy of the cart it gained at the height.
What is work done ?Work done is the measure of the effectiveness of the force on making some displacement. It is the dot product of force and displacement. Work done like force is a vector quantity and have magnitude and direction.
When a force applied on a body results in a displacement, then it is said to be work is done on the body. The work done is numerically equal to the energy needed to displace the object.
Here, the force applied on the cart of 100 Kg results in a work done on the cart by pulling it to height. Where the energy equivalent to the work done is stored in the form its potential energy. The potential energy
p = mgh
Some fraction of work done is stored as this energy while the remaining probably lost into the surroundings.
Find more on potential energy;
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The speed of light in a piece of plastic is 1.87 × 10^8 meters per second. What is the absolute index of refraction of this plastic?
Question 11 options:
1.00
1.6
0.67
1.33
[tex]\tt\red{See \; Your \: Answer!}[/tex]
Your answer was 0.67m...
When 16.6 V is applied to a capacitor, it stores an energy of 8.15 x 10-4 J. How much charge is on the plates?
Answer: 9.91 * 10^-5
Explanation: acellus
a vibrating source with a frequency of 20.0Hz produces water waves that have a wavelength of 3.0 cm. Calculate the speed of the waves 
Answer:
60m/s
Explanation:
v=frequency ×wave length
v signifies the speed
The speed of a wave is the product of its frequency and wavelength. Hence the speed of the wave with a frequency of 20 Hz and 30 cm wavelength is 0.6 m/s.
What frequency?Frequency of a wave is the number of wave cycles produced at unit time. Thus it has the unit of s⁻¹ which is equivalent hertz Hz.
Wavelength of a wave is the distance it travels in a wave cycle or for a transverse wave the distance between two consecutive crests or troughs is called wavelength.
The relation between frequency v, wavelength [tex]\lambda[/tex] and speed of a wave c is written as below:
[tex]c = v \lambda[/tex]
By this expression it is clear that the speed of increases with frequecy and wavelength.
The frequency of the given vibrational source is 20 Hz and the wavelength is 3 cm or 0.03 m. Hence, the speed of the wave is calculates as follows:
c = 20 Hz × 0.3 m
= 0.6 m/s.
Therefore, the speed of the wave is 0.6 m/s.
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ASAP will do brainiest 22 points PLSS HELP
Sports such as football, baseball, soccer, horseback riding, tennis, volleyball, skateboarding, and surfing (to name a few) are full of examples of Newton’s Three Laws of Motion. To answer this question: 1. Choose any sport. Write down the name of the sport. 2. In your own words, state each of Newton’s 3 Laws of Motion and give a clear, specific example of how each law applies to the sport you have chosen.
Answer:
tenis
Tenis applies to each of Newton's 3 Laws of Motion because with the first law if a tenis ball is at rest it will stay at rest unless acted on by an unbalanced force which would be playing tenis in which it would stay in motion. The second law applies since the acceleration at which it is hit times the mass equals the force it has. The third law applies since when hitting a tenis ball back and forth with racquets the reaction may be equal or opposite
It takes a crane 60 seconds to lift a 150kg box from the ground to the top of a 100m tall building. Calculate the magnitude of power exerted by the crane to lift the box
A. 9 x 109 W
B. 9 x 109 N
C. 2450 W
D. 2450 N
E. None of the above
Answer:
Explanation:
Power equals the amount of work done divided by the time it takes to do the work (in seconds). Work itself is equal to the amount of force it takes to move an object a certain number of meters. We are given the mass of the object. Since force is a measure in Newtons, and we are given mass, we need to use the mass to find the weight of the object, since weight is a force and is measured in Newtons!
F = weight = 150(9.8) so
F = 1470. Now we will use that along with the displacement in the Power equation:
P = [1470(100)]/60 so
P = 2450 Watts, choice C.