Answer:
power
power is the rate of doing work. It is equivalent to an amount of energy consumed per unit time. In the SI system, the unit of power is the joule per second (J/s).
An Lois Lane weighs 480 N on Earth. Superman takes Lois Lane to the planet Krypton to meet the parents. Krypton has a mass and diameter each 10 times that of Earth. Determine her weight at a distance of two Kryptonian radii above that planet.
Krypton was soon revealed to have formerly been a planet like Earth, only older by eons and possessing. All the advantageous advancement that entailed, starting in the Superman comic strip (though the downside was the hint that Krypton exploded due mainly to old age).
What Kryptonian radii above that planet?Superman's ability to defy gravity is also explained by another school of thinking, although with a slight variation. Krypton was a gigantic planet with a gravity so strong that typical humans would be crushed beneath its gravitational pull because it was about 1000 times bigger than Earth.
Therefore, Krypton, which was about 1.5 times the size of Earth and was located 50 light-years from the Sun, orbited the red star Rao.
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workers expect inflation to fall from 4% to 1% next year. as a result, this should
Workers expect inflation to fall from 4% to 1% next year. as a result, this should Shift the short-run aggregate supply curve to the right.
Option (B) is the correct choice.
The SRAS curve demonstrates that the amount of real GDP that will be generated in an economy grows as the price level rises as you move along the SRAS.
A movement to the right indicates an increase in the SRAS.
In the near run, decreasing wages, increasing the stock of physical resources, lowering inflation, and advances in technology would move the aggregate supply curve to the right.
The short term aggregate supply will move to SRAS2 on the left if businesses and labour anticipate price increases.
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The complete question may be:
Workers expect inflation to fall from 4% to 1% next year. As a result, this should
A) shift the short-run aggregate supply curve to the left.
B) shift the short-run aggregate supply curve to the right.
C) move the economy up along a stationary short-run aggregate supply curve.
D) move the economy down along a stationary short-run aggregate supply curve.
the anti-lock brake system engages every time the driver applies the brakes. group of answer choices true false
two objects attract each other with a gravitation force of magnitude 3.80 x 10-8 n when separated by a distance of 0.350 m. if the difference in mass of the objects is 7.50 kg, what is the mass for each of these objects?
The mass for each of these objects is 12.91kg and 5.41kg.
Gravitational Force:
The traditional hypothesis that explains gravity is Newton's law of gravitation. Only the masses of two objects and their distance from one another are taken into account by this law. According to Newton's law of gravitation, the following is how much gravitational force there is between two objects.
F = GMm/r²
Where,
r is the radius.
M and m are the masses of the objects.
G = Universal constant = 6.67 × 10⁻¹¹ [tex]\frac{m^{3} }{kgs^{2} }[/tex]
Given,
Gravitational Force = 3.8 × 10⁻⁸ N
Distance between two objects = 0.35 m
Let,
The mass of one object is x kg.
Then,
The mass of the second object = (x - 7.5) kg.
Now,
F = GMm/r²
3.8 × 10⁻⁸ = 6.67 × 10⁻¹¹ × x × (x - 7.5)/[tex](0.35)^{2}[/tex]
x² - 7.5x - 575.76 = 0
x = 12.91, 5.41
Hence,
The mass for each of these objects is 12.91kg and 5.41kg.
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cumulus clouds often indicate a. a dry adiabatic lapse rate. b. a temperature inversion. c. possible turbulence.
Cumulus clouds often indicate Optiion C. possible turbulence.
Turbulence, associated with thunderstorms, may be extremely risky, having the ability to motivate overstressing of the aircraft or lack of manipulation. Thunderstorm vertical currents can be sturdy sufficient to displace a plane up or down vertically as plenty as 2000 to 6000 ft.
Turbulence is only one type of alternate in the air around your aircraft. Air is not nothingness; it's a fluid, like water. Currents of airflow up and down, ripple out, trade direction, and change speed. some of the things that reason turbulence are simpler to expect.
Turbulence is an unexpected and every-so-often violent shift in airflow. the ones irregular motions within the atmosphere create air currents that may purpose passengers on an aircraft to enjoy stressful bumps throughout a flight, or it is able to be extremely sufficient to throw an airplane out of manage.
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Approximately how much work do you do when you lift your 10.0 kg sister to a height of 1.5 m?
The amount of work done in lifting the sister to a height of 1.5m is approximately 147 J.
The height to which the sister of mass 10.0 Kg is lifted is 1.5m.
The work done to lift sister is given by,
W = MgH
Where,
M is the mass of the sister,
g is the acceleration due to gravity,
H is the height to which the sister as lifted,
The value of acceleration due to gravity of earth is 9.8m/s².
Now, putting all the values accordingly,
W = 10.0 x 9.8 x 1.5
W = 147 Joules.
So, the amount of work done in lifting the sister is 147 J.
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when is the angle at which a ray of light strikes glass not the same as the angle it exits?
Answer:
Explanation:
Assuming the light travels through air, hits the glass and is then reflected back into air (in other words, the medium is the same), the only reason the angle of incidence would NOT equal the angle of reflection is if the surface of the glass is not smooth (is rough, scratched, etc.)
which of the following is fundamentally different from the others? a. sound waves b. x-rays c. gamma rays d. green light waves e. radio waves
Sound waves are fundamentally from the other waves.
A sound wave is a pattern of disruption brought on by the movement of energy moving through a medium as it propagates away from the source of the sound (such as air, water, or any other liquid or solid matter).
Sound waves are fundamentally from the other waves.A sound wave is a configuration of disruption brought on by an energy flow moving through a medium.Unlike electromagnetic waves, which do not require any medium for propagation, the medium can be air, water, liquid, or any other solid material.Electromagnetic waves include X-rays, radio waves, and light waves.Electric and magnetic waves combine to form electromagnetic waves.Know more about Sound waves at:
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A football player pushes a training sled 20 meters while pushing with a constant force of 300 Newtons. If this is accomplished in 7.5 seconds, what power was exerted?
The Power exerted will be 800W
What is Power?Power is the quantity of energy that is transferred or transformed in a certain length of time. The watt, which is equal to one joule per second as in the International System of Units is the unit of power. A scalar concept is a power.
Using te formular;
Power = (Force x distance) / time
P = (F x d) / t
where F = 300N
d = 20m
t = 7.5s
P = (300 x 20) / 7.5
P = 800W
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a sky diver jumps from a plane traveling horizontally at 55 m/s at an altitude of 1500 m. when she reaches an altitude of 425 m, she is falling at a terminal velocity of 52 m/s. how much work has been done by air resistance during this time?
The work that has been done by air resistance during this time is 55800 k m²/s².
To determine the work done by air resistance during the skydiver's fall, we can use the equation:
W = F × d
where W is the work, F is the force of air resistance, and d is the distance traveled.
The force of air resistance on the skydiver is given by the equation:
F = k × v²
where k is the drag coefficient, which is a measure of the resistance of the air to the movement of the object, and v is the velocity of the skydiver.
To determine the work done by air resistance, we need to determine the distance traveled by the skydiver and the force of air resistance at each point in her fall. The skydiver falls from an altitude of 1500 m to an altitude of 425 m, a distance of 1075 m.
At an altitude of 1500 m, the skydiver is falling at a terminal velocity of 52 m/s. Plugging these values into the equation for the force of air resistance gives us:
F = k × v² = k × (52 m/s)²
To determine the work done by air resistance at this point in the skydiver's fall, we can plug the value of F and the distance traveled into the equation for work:
W = F × d = (k × (52 m/s)²) × 1075 m = 55800 k m²/s²
The work done by air resistance at this point in the skydiver's fall is 55800 k m²/s².
At an altitude of 425 m, the skydiver is falling at a terminal velocity of 52 m/s. Plugging these values into the equation for the force of air resistance gives us:
F = k × v² = k × (52 m/s)²
To determine the work done by air resistance at this point in the skydiver's fall, we can plug the value of F and the distance traveled into the equation for work:
W = F × d = (k × (52 m/s)²) × 1075 m = 55800 k m²/s²
The work done by air resistance at this point in the skydiver's fall is 55800 k m²/s².
To determine the total work done by air resistance during the skydiver's fall, we can add the work done at each point in the fall:
W_total = W_1500m + W_425m = 55800 k m²/s² + 55800 k m²/s² = 111600 k m²/s²
The total work done by air resistance during the skydiver's fall is 111600 k m²/s².
Note that this calculation assumes that the drag coefficient k is constant throughout the skydiver's fall. If the drag coefficient changes during the fall (for example, if the skydiver deploys a parachute), additional calculations will be needed to determine the total work done by air resistance.
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The temperature at a point in a ball with conductivity K is inversely proportional to the distance from the center of the ball. Find the rate of heat flow across a sphere S of radius a with center at the center of the ball.
A sphere S with a radius of a and a centre in the centre of the ball will conduct heat flow at a rate of 4πcK
Given In a ball with conductivity K, the temperature at a given place is inversely proportional to the distance from the ball's centre. If the scalar field u(x, y, z) exists and the divergence of u is ∇u = ∂u/∂xi+∂u/∂yj+∂u/∂zk
The surface integral is used to calculate the rate of heat flow over the body's surface S. ∬F⋅dS = F⋅n∬dS
Equation for the radius of a sphere is x^2+y^2+z^2 = a^2
And if the temperature of a ball is u(x, y, z), then u(x, y, z) ∝ 1/√x^2+y^2+z^2
The proportionality constant is denoted by c. So, u(x, y, z) = c/√x^2+y^2+z^2
Then ∇u = ∂(c/√x^2+y^2+z^2)/∂xi+∂(c/√x^2+y^2+z^2)/∂yj+∂(c√x^2+y^2+z^2)/∂zk
∇u = -(cx/√x^2+y^2+z^2)i-(cy/√x^2+y^2+z^2)j-(cz/√x^2+y^2+z^2)k
Hence F = -K.∇u
F = cK(xi+yj+zk)/(x^2+y^2+z^2)^3/2
And the outward unit normal is, n = 1/a(xi+yj+zk)
Thus F.n = cK(xi+yj+zk)/(x^2+y^2+z^2)^3/2 x 1/a(xi+yj+zk)
F.n = cK/a*(x^2+y^2+z^2)^1/2 but x^2+y^2+z^2 = a^2
F.n = cK/a^2
The rate of heat flow = F⋅n∬dS = cK/a^2∬dS
cK/a^2(4πa^2) = 4πcK
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If 2.5 minutes is the maximum access time for a magnetic tape, ____ is the average access time.
a. 0.5 minutes c. 1.25 minutes
b. 1 minute d. 2 minutes
The average access time of the magnetic tape is 1.25 minutes
What is access time of a magnetic disc?Disk access time is defined as the total time required by the computer to process a read/write request and then retrieve the required data from the disk storage.
The access time may be counted in nanoseconds for a semiconductor device, in milliseconds for a magnetic disk, or in minutes if the file containing the required data is on magnetic tape.
A magnetic field sensing read head and a magnetic field inducing write head are used for accessing data on each recording surface.
The average time of the magnetic tape is :
(0+2.5)/2
average access time = 2.5/2 = 1.25 minutes
Therefore the average access time of the magnetic tape is 1.25minutes.
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A mass of sunken lead is resting against the bottom in a glass of water. You take this lead, put it in a small boat of negligible mass, and float the boat in the water.
1.) Which of the following statements are true? (There may be more than one correct choice.)
A. The sunken lead displaces a volume of water equal to the lead's own volume.
B. The floating lead displaces a volume of water equal to the lead's own volume.
C. The sunken lead displaces a volume of water whose weight equals the lead's weight.
D. The floating lead displaces a volume of water whose weight equals the lead's weight.
The sunken lead displaces a volume of water equal to the lead's own volume. The floating lead displaces a volume of water whose weight equals the lead's weight.
What is Mass?
It is the most fundamental characteristic of matter and one of the fundamental quantities in physics. Mass is a term used to describe how much matter is there in a body. The kilograms is the SI unit of mass (kg).
A body's mass does not alter at any point in time. only in rare instances where a significant quantity of energy is supplied to or taken away from a body. A nuclear reaction, for instance, results in the mass of the substance being reduced as a very little amount of matter is transformed into a very large amount of energy.
This law provides a numerical description of how a force might alter a body's motion.
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if an object doubles its luminosity in 10 hours, how large can the emitting source of light be?
If an object doubles its luminosity in 10 hours, emitting source of light can be about 10 light hours across.
Luminosity, L, is a measure of the total amount of energy radiated by a star or other celestial object per second. This is therefore the power output of a star. A star's power output across all wavelengths is called its bolometric luminosity. A star's luminosity can be determined from two stellar characteristics: size and effective temperature. The difference between luminosity and apparent brightness depends on distance.
Since, the luminosity of the object doubles in 10 hours, emitting source of light can be about 10 light hours across.
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Give any Two Proops Proops to show that the Earth rotates from West to East
The earth rotates from west to east that why sun rises at east and sets in the west. Similarly we see that the moon also visible from the east then at west.
What is prograde rotation?The earth rotates counterclockwise, from west to east, as seen from above the north Pole. This is also referred to as a Prograde rotation.We know that the earth rotates once every 24 hours.
As the earth rotates from west to east, the moon, sun, and all other celestial bodies appear to move from east to west in the opposite direction of the earth's rotation. This is the primary reason for the sun rising in the east and setting in the west.
Therefore, it is proven that the earth is rotating from west to east.
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at what point does the terminal side of the angle 7π4 in standard position intersect the unit circle?
At point [tex](\frac{\sqrt{2}}{2} ,- \frac{\sqrt{2}}{2} )[/tex] the terminal side of the angle [tex]\frac{7\pi}{4}[/tex] in standard position intersect the unit circle.
A unit circle is divided into four quadrants, each of which has an angle of 90°, 180°, 270°, and 360° (in degrees) or π/2, π. 3π/2, and 2π (in radians) respectively.
A unit circle angle is always measured from the positive x-axis, with the vertex at the origin. Its initial side is on the x-axis, while the terminal side is formed by the ray that begins at the origin and coincides with the point on the unit circle. When an angle is measured anticlockwise from the x-axis, it has a positive value.
Quadrant 1 – (0 – 90°) : X is positive, Y is positive
Quadrant 2 – (90° – 180°) : X is negative, Y is positive
Quadrant 3 – (180° – 270°) : X is negative, Y is negative
Quadrant 4 – (270° – 360°) : X is positive, Y is negative
Given,
The radius of circle = 1 unit
The terminal side of angle = \frac{7\pi}{4}
[tex]\frac{7\pi}{4}=\frac{7*180}{4}=315\textdegree[/tex]
here, the angle 315° lies in the fourth quadrant, and we know that in 4th quadrant the x is positive and y is negative.
So, from the given options, the point [tex](\frac{\sqrt{2}}{2} ,- \frac{\sqrt{2}}{2} )[/tex] lies in the 4th quadrant.
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Your question is incomplete, here is the complete question.
At what point does the terminal side of the angle 7π/4 in standard position intersect the unit circle?
a) (-√2 / 2, -√2 / 2)
b) (-√2 / 2, √2 / 2)
c) (√2 / 2, -√2 / 2)
d) (√2 / 2, √2 / 2)
Resistors R1, R2, R3, and R4 are arranged in a circuit as shown in the figure above. The direction of positive currents I1, I2, I3, and I4 through the resistors are shown. (i.e., negative current values correspond to currents in the opposite direction to that shown above). The values for the resistors and the batteries in the circuit are: R1 = 100 ?, R2 = 200 ?, R3 = 30 ?, R4 = 400 ?, V1 = 4 V, and V2 = 12 V.What is the value of I2, the current through R2? (remember I2 is a signed number) I2 = ?
The current of the resistor 2 from a circuit of four resistors is calculated to be 2 A.
A resistor is an electronic component that is designed to reduce the flow of electricity in a circuit. It is typically used to limit the amount of current flowing through a circuit, and it can also be used to regulate the voltage in a circuit. Resistors are typically composed of a conductive material, such as carbon, metal, or ceramic, and they are available in a variety of shapes and sizes.
I₂ is found using Ohm's Law. I₂ = (V₂ - V₁)/R₂, where V₂ and V₁ are the voltage across R₂ in the same direction as current I₂, and R₂ is the resistance of resistor 2. Substituting the given values gives
I₂ = (12 - 4)/200 = 8/200 = 0.04 A = 2 A.
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a gas is enclosed in a cylinder fitted with a light frictionless piston and maintained at atmospheric pressure. when 254 kcal of heat is added to the gas, the volume is observed to increase slowly from 12.0 m3 to 16.2 m3 . Calculate the work done by the gas and the change in internal energy of the gas.
Upon absorbing 254 kcal of heat, a gas contained in a cylinder kept at atmospheric pressure sees a rise in volume from 12.0 m3 to 16.2 m3. The work performed by the gas is -1.01 × 10⁵ Kcal, and the internal energy has changed by -1.01 × 10⁵ Kcal
The volume of a gas contained in a cylinder at atmospheric pressure (P = 101325 Pa) increases from 12.0 m³ to 16.2 m³.
The following phrase can be used to determine the work (w) that the gas has performed.
w = -P × ΔV = -101,325 Pa × (16.2 m² - 12.0 m²) = -4.26 × 10⁵ J × 1kcal/4181J = -1.02 × 10⁵ Kcal
The gas receives 254 kcal of heat, making q equal to 254 kcal. The following phrase can be used to determine how the internal energy (E) has changed.
ΔE = q + w = 254 Kcal + (-1.02 × 10⁵ Kcal) = -1.01 × 10⁵ Kcal
When a gas is contained in a cylinder that is kept at atmospheric pressure, it absorbs 254 kcal of heat, increasing its volume from 12.0 m³ to 16.2 m³. The gas expends -1.02 × 10⁵ kcal of effort, and the internal energy changes by -1.01 × 10⁵ kcal.
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in amps. a constant voltage of 77 volts is put across a resistance that is increasing at a rate of 0.20.2 ohms per second when the resistance is 55 ohms. at what rate is the current changing?
A constant voltage of 77 volts is put across a resistance that is increasing at a rate of 0.202 ohms per second when the resistance is 55 ohms. The current is changing at a rate of 0.0051amps per sec
Given voltage (V) = 77v
Resistance (R) = 55ohms
The relation among voltage (V), resistance (R) and current (I) is given as
I =V/R
The increasing rate of resistance is = dR/dt = 0.2ohms per second
By derivating the current to get rate of change in current
dI/dt = Vxd/dt(1/R) [ Because V is a constant ]
dI/dt = V x d/dt(R −1)
dI/dt = V(-1/R^2 x dR/dt) = 77x (-1/55x55) x 0.202 = -0.005amp per second
Hence the current is changing at a rate of 0.0051amps per sec
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imagine that you are an olympic sprinter, running at a speed of 11 m/s around the curve of a circular track with a radius of 36.5 m. what is your centripetal acceleration?
When an Olympic sprinter runs around the curve of a circular track with a radius of 36.5 m, they experience centripetal acceleration of 3.31m/s2.
Given that the runner's speed(v) = 11 m/s
Circular track radius (r) equals 36.5 meters
Centripetal acceleration (ac) is calculated as follows:
(11x11)/36.5 = 3.31 m/s2.
Centripetal acceleration is a characteristic of an object's motion along a circular path. Centripetal acceleration applies to any item travelling in a circle with an acceleration vector pointing in the direction of the circle's center. The centripetal acceleration, denoted by the symbol AC, has a magnitude equal to the square of the velocity of the body along the curve divided by the radius of the circle, denoted by the symbol r. This is also known as the formula ac = v2/r.
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B) Calculate the maximum force of static friction that could exist in this system.
Please help me I have no idea
The fraction of kinetic energy which is transferred to the atomic nucleus is 30.3% and the final kinetic energy of the neutron is 2.93*10^-13.
What is kinetic energy?An object's kinetic energy refers to the energy it has as a result of motion. After the job is finished, the object will be traveling at a new, constant speed because energy has indeed been transferred to it.
Briefing:let the mass of neutron =m
Mass of neucleus= M
given: M=11.1m
by conservation of kinetic energy:
fraction of energy that will be transferred to the nucleus = [tex]\frac{4mM}{(M+m)^{2} }[/tex]
= 44.4/146.41
=0.303
let u be the initial velocities of neutron and nucleus
and v be the final velocities of neutron and nucleus
By conservation of linear momentum,
mu+Mu=mv+Mv
v(nucleus)=2*v(neutron)/12.1
the initial kinetic energy of neutron= 4.2*10^-13
so on solving the final kinetic energy of neucleus=1.27*10^-13
so,
final k.e.of neutron=4.2*10^-13 - 1.27*10^-13
= 2.93*10^-13
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light travels at about 300 million meters per second, and the sun is about 150 million kilometers from the earth. how long does it take light from the sun to reach earth?
The sun is 150 million kilometres away from the earth, and light travels at a speed of 300,000 km/sec. As a result, it takes over 8 minutes for sunlight to reach earth.
What is Light Year?
The light-year is a unit of distance, not of time (as the name might imply). A light-year is the distance a light beam travels in one year on Earth, which is around 6 trillion miles (9.7 trillion kilometers).
Given the extremely enormous numbers being discussed, it is difficult to measure lengths in miles or kilometres on the size of the universe. Astronomers can measure the distances of stars from Earth in a much less time than it takes for light to cross that vast distance. For instance, Proxima Centauri, the star closest to our sun, is 4.2 light-years distant from us, which means it takes little over four years for the star's light to reach us.
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a ball is thrown upward. at a height of 10 meters above the ground, the ball has a potential energy of 50 joules (with the potential energy equal to zero at ground level) and is moving upward with a kinetic energy of 50 joules. air friction is negligible. the maximum height reached by the ball is most nearly: group of answer choices 40 m
The maximum height reached by the ball thrown upwards with kinetic and potential energies specified is nearly 20 m.
Utilising the principle of energy conservation, we can solve this problem.
While the KE is largest at the surface and 0 at the top, the PE is zero at the surface and maximum at the top.
From the above data,
PE = mgh = 50 J ----(1)
m g* 10 = 50
m* g = 50/10
m* g = 5
The total energy at that point = PE + KE = 50 + 50 = 100 J
The PE will therefore be 100 J at the highest point.
m g H = 100 J , H is the needed height
Using the above-mentioned value of m* g, we have
H = 100/5
H = 20 m
So, the maximum height reached by the ball is 20 m.
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All of are following are same process. EXCEPT
A.Condensation
B.Freezing
C.Crystallization
D.Solidification
Condensation, freezing, solidification are same process while crystallization is different from condensation, freezing and solidification.
A. Condensation - It is the process of conversion of water vapours or gas to liquid. For example conversion of steam into water. Condensation occurs at 100 degree celcius.
B. Freezing - It is the phase when liquid gets converted into solid. For example conversion of water into ice. It starts at 0 degree celcius for water.
C. Crystallization - It is the process of forming Crystals. For example evaporation of salt water.
D. Solidification - The process of conversion of liquid into solid. For example formation of snow and solidification of melted candle wax.
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Condensation, freezing and solidification are same process of phase transformation whereas Crystallization is different from others.
What is phase transformation?The physical process of changing a medium's state from one to another is known as a phase transition (or phase change) in the domains of chemistry, thermodynamics, and other related sciences. The phrase is frequently used to describe transitions between the three fundamental states of matter—solid, liquid, and gas—and, in rare instances, plasma.
The physical characteristics of a phase of a thermodynamic system and the states of matter are constant. Certain properties of a given medium change during a phase transition as a result of a change in the environment, such as temperature or pressure. This change can be discontinuous. The phase transition point is identified by the external circumstances in which a change takes place.
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the fruits are tossed in the air and spin back to the ground acting like small helicopters, which part of the fruit allows for this
The wall of a fruit, advanced from the ovary wall. The ripened and variously changed partitions of a plant ovary.
Consisting of the outer exocarp, significant mesocarp and internal endocarp, that is the wall of a plant fruit that develops from the ovary wall.
Pericarp: ↑ The a part of the fruit that surrounds the seed(s). The pericarp is shaped via way of means of 3 wonderful layers: exocarp, mesocarp, and endocarp.
Dehiscence: Splitting open at adulthood which will launch its contents (example: the fruit splits to launch the seeds). Children withinside the Southeastern United States play with pink maple culmination (Acer rubrum). The culmination are tossed withinside the air and spin again to the floor, performing like small helicopters. the culmination are tossed withinside the air and spin again to the floor performing like small helicopters, which a part of the fruit permits for this.
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which of the following materials can be used to estimate the age of the earth and our solar system?
The materials used to determine the age of earth and the age of our solar system is the fragments from the Canyon Diablo iron meteorite.
The age of earth can be determined by the radio uranium dating. In 1920's, Earth's age crept up toward 4.5 billion years, making it for a time even older than the universe, which was then estimated to be about 13.7 billion years old.
All the rocks and minerals contain long-lived radio active elements that were incorporated into earth when the solar system formed.
According to research on meteorites, the age of the solar system is close to 5 billion years old, whereas the age of the Earth is assumed to be 4.6 billion years. The Earth's oldest rocks are estimated to be 3.8 billion years old.
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what is the phenomenon called when the center of a galaxy gets extremely bright due to lots of material falling into the supermassive galaxy at the center of a galaxy?
When this occurs, a supernova results. A supernova is a star that explodes and sends a portion of the star into space. Supermassive black holes are believed by scientists to have formed simultaneously with the galaxy they are in.
What is Galaxy ?
Galaxies are collections of stars and other celestial objects that are gravitationally bound. The cosmos contains more than 100 billion galaxies, each of which has stunning formations seen in photographs captured by telescopes of the far sky.
According to Jenna Samuel, a PhD candidate in astrophysics at the University of California, Davis, a galaxy may be conceptualised as a collection of stars, gas, and dark matter that are all gravitationally bonded to one another
A galaxy is a vast region of space bound together by gravity and made up of stars, dust, interstellar gas, stellar remains, and dark matter. The Greek word "galaxies" is the source of the English word "galaxy." It is challenging to gauge the size of the cosmos! There are numerous galaxies in the cosmos, and each one contains millions of stars that are constrained by a special force called gravitational pull. The cosmos contains about 70,000,000,000 stars. The Milky Way Galaxy contains the solar system in which our planet is located.
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during the game, the metabolism of basketball play- ers often increases by as much as 30.0 w. how much perspiration must a player evaporate per hour to dissipate this extra thermal energy?
Basketball players' metabolisms frequently accelerate by up to 30.0 w while they are playing. To release this extra thermal energy, a player must perspire 4.78x10-2kg.
Given that players release 30 J/s of heat (Q)
Heat is lost each hour given that
U=(30J/s)(3600s/h)=1.08x105J of thermal energy is lost per hour.
The amount of water that would be vaporized by this energy transmission is given by the formula:
m = U/Lwater
m=(1.08x105J)/(2.26X106J/kg)=4.78x10-2kg.
The temperature affects how hot water vaporizes. It is 2.257 x 106 J/kg at the boiling point (100C), but it is more like 2.40 x 106 J/kg at 37C.
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(a) an electron has a kinetic energy of 3. 0 ev. Find its wavelength. (b) also find the wavelength of a photon having the same energy.
Its wavelength is 8.47 x 10-11 m and wavelength of a photon having the same energy is 1.01 x 10-7 m.
What is wavelentgh?Wavelength length is a distance between two consecutive peaks of a wave it is most commonly associated with light and sound wave but can also refer to electromagnetic radiation like gamma rays x-rays and radio wavelentgh is usually measured in meters or nanometers.
(a) The wavelength of an electron with a kinetic energy of 3.0 eV can be calculated using the formula λ= h/√(2mKE) , where h is Planck's constant (6.62607 x 10-34 Js), m is the electron's mass (9.10938 x 10-31 kg), and KE is the kinetic energy (3.0 eV). Plugging in the values gives us a wavelength of 8.47 x 10-11 m.
(b) The wavelength of a photon with the same energy as the electron can be calculated using the equation λ= hc/E, where h is Planck's constant (6.62607 x 10-34 Js), c is the speed of light (299792458 m/s), and E is the energy of the photon (3.0 eV). Plugging in the values gives us a wavelength of 1.01 x 10-7 m.
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