We an see all three objects clearly in the visible part of the spectrum, even though the peak intensity might lie outside that region because we perceive only what lies in the visible region.
The sun and Sirius A emits light in every part of the electromagnetic spectrum. But our eyes cannot perceive every frequency of light. We see only what can be perceived by a human eye. Just because we cannot see other spectrum does not mean that it is not present.
The visible spectrum of light is 400 nm to 780 nm. The colours are:
Violet - 400 to 420 nmIndigo - 420 to 440 nmBlue - 440 to 490 nm Green - 490 to 570 nmYellow - 570 to 585 nmOrange - 585 to 620 nmRed - 620 to 780 nmTherefore, we can see all three objects clearly in the visible part of the spectrum, even though the peak intensity might lie outside that region because we perceive only what lies in the visible region.
The given question is incomplete. The complete question is:
Consider three objects - Sirius A, Sun and light bulb. We can see all three objects clearly in the visible part of the spectrum, even though the peak intensity might lie outside that region. why is this so?
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If the mass of a person on Earth is 20 kg,
what will be his mass on the Moon? (Gravity on
the Moon is six times less than the gravity on
Earth.)
Answer:
Explanation:
Mass on the Moon:
m = 20 kg
If the planet jupiter underwent gravitational collapse, its rate of rotation about its axis would.
If the planet Jupiter underwent gravitational collapse, its rate of rotation about its axis would increase .
Gravitational collapse is the contraction of an astronomical object due to the influence of its own gravity, which tends to draw matter inward toward the center of gravity.
If the planet Jupiter underwent gravitational collapse, its rate of rotation about its axis would increase as the speed will increase .
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1) What is the difference between force and net force on an object
Answer:
Net force is the sum of all the forces.
Explanation:
Force is the push or pull that causes acceleration.
Net force is the sum of all the forces acting on an object
The outcome is a force when an external force pushes or pulls on one thing as it interacts with another object. On the other hand, there won't be any evidence of force if both objects are imprisoned in one location and there isn't any outside pressure.
For example,
When Mathew pushes an automobile, they provide force to the vehicle while dissipating energy; this is shown by the fact that Mathew pushes the car with an 8 Newton (8 N) force.
The amount of force acting on an item from both sides is known as a net force whenever several forces are present, regardless of the direction they are acting from.
The resultant force is another term for this force.
For example,
James pulls a rope from one side, while Thomas pulls a rope from the other, such that a force is exerted on the rope from both sides. This pulling force from both sides is referred to as Net force.
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for conservative forces, force can be found as being the negative of the derivative of for conservative forces, force can be found as being the negative of the derivative of potential energy. momentum. impulse. kinetic energy. work.
A conservative force negatively affects an object if it pushes the object in the opposite direction of the force. This pulls the body away from the power center.
A force is said to be conservative if the work done by it does not depend on the distance traveled, but only on the starting and ending positions. If the y-component derivative of the force with respect to x is equal to the x-component derivative of the force with respect to y, then the force is a conservative force, the path always taken in the computation of potential energy or work. I get the same result.
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find the mass and center of mass of the lamina bounded by the graphs of the equations for the given density. y
Bar x = frac M y M = 4 gives the xx-coordinate of the center of mass as x = MY/M y = 4.
What are a mass and an example?The quantity of substance present in any item or body serves as the best definition of mass. We see mass in everything around us. For instance, objects like a table, chair, bed, football, glass, or even air have mass. All items have mass, which determines whether they are light or heavy.
What does mass in force mean?Force is equal to mass multiplied by acceleration for a fixed mass. F = ma is how this is expressed mathematically. m stands for mass, F for force, and a for acceleration. This involves some straightforward math. If the force is doubled, the acceleration is also doubled; however, if the mass is doubled, the acceleration is cut in half.
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Suppose a distant galaxy has a recessional velocity of 8254 km/s. What is its distance given that the hubble constant is 70 km/s/mpc?.
Its distance given that the hubble constant is 70 km/s/mpc , is 117.91 Mpc.
What is hubble constant ?
Finding the true value of the Hubble constant is one of the greatest challenges in modern astronomy and could revolutionize our understanding of the universe. As such, scientists at the University of Chicago and many institutions around the world are trying to determine the numbers using multiple methods.
For a celestial body (such as a star or galaxy) at a known distance from Earth, you can use the Hubble constant to predict how fast it is moving away from Earth.
However, the true value of the Hubble constant is debatable. Based on the underlying physics that scientists believe drives the evolution of the universe, the Hubble constant should be about 68 km/s/Mpc, which is what astronomers see around us. does not match observations of real stars and galaxies in the sky. A team led by UChicago astronomer Wendy Freedman made 72 landmark measurements in 2001. The most recent accurate measurements of the distance and motion of a distant exploding star show the Hubble constant to be 69.8 km/s/Mpc, whereas other reports place this figure at 74 km/ Pushing up to s/Mpc.
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A tv with a power rating of 200 w uses 0. 8 kwh of electrical energy in one day. For how many hours was the tv on during this day?.
The TV was on for 4 hours during the day.
E = 0.8 kWh
P = 200 watts
t = E/P
t = 0.8/0.2
t = 4 hours
The electric energy definition: the capability to carry out work. Electrical power comes from the appeal or repulsion of negatively and positively-charged molecules. Electrical energy is both potential and kinetic power.
Electric energy is a kind of kinetic power due to transferring electric charges . The quantity of power relies upon on the rate of the costs – the quicker they move, the greater electric energy they carry.
Power is an important a part of present day life and crucial to the U.S. economic system. people use energy for lighting fixtures, heating, cooling, and refrigeration and for working home equipment, computer systems, electronics, equipment, and public transportation structures.
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consider a thermocouple circuit made with copper (cu) and constantan (c) wires. the seebeck coefficients of copper and constantan are
The reading of voltmeter of a thermocouple circuit made with copper (cu) and constantan (c) wires is 8791μV.
We have Seebeck coefficients of copper and constantan, also we have temperature of source as 25°C and temperature of ice is 0°C
We also know that Seebeck coefficient is given by the negative of ratio of change in voltage to the change in temperature, or in other words
S= -ΔV/ΔT
Now, Seebeck coefficient of copper(6.5μV/K) and Seebeck coefficient of constantan as -35 μV/K
Therefore, net Seebeck coefficient of thermocouple is =6.5+(-35)= -29.5 μV/K
Now, temperature difference is 25°C as temperature of ice is 0°C
We need to convert degree in kelvin as standard calculations involves temperature in kelvin.
We use K=C+273
Therefore, temperature difference is =25+273=298K
Therefore, according to the formula, we get
Voltage= - net Seebeck coefficient × net temperature change
=>V= -(-29.5μV/K×298K)
=>V=8791μV
Hence, voltmeter reads 8791μV.
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(Complete question) is :
Consider a thermocouple circuit made with copper (Cu) and constantan (C) wires. The Seebeck coefficients of copper and constantan are: Acu=6.5 μV/K, ac=-35 μV/K. If T1 = 25°C, what's the reading of Voltmeter?
In a materials testing laboratory, a metal wire made from a new alloy is found to break when a tensile force of 94.2N is applied perpendicular to each end. If the diameter of the wire is 1.25mm , what is the breaking stress of the alloy? P=? Pa
The breaking stress of the alloy is 74.131 MPa
Stress = force/cross sectional area
= 94.2/(3.14*(0.00125^2)/4) = 73131210 Pa = 74.131 MPa
The amount of forces that induce deformation is measured in terms of stress. Force per unit area is a common definition of stress. Tensile stress is the term used to describe a force that pulls on an object and causes it to elongate, much as how an elastic band stretches. Compressive stress is what we refer to when forces cause an object to compress. Bulk stress is the term used to describe pressure exerted on an object from all sides, such as a submarine submerged in water (or volume stress). In some circumstances, the operating forces might not be tensile or compressive but yet result in an observable deformation. Imagine, for instance, that you are tightly gripping a book with one of your hands.
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calculate the moment of inertia for a solid sphere with radius 0.012 m and mass 0.26 kg. express your answer in si units (but don't write the units into the box).
A solid sphere with a radius of 0.012 m and a mass of 0.26 kg, then the moment of inertia of solid sphere will be equal to 0.149 × 10⁵ kg - m².
What is a moment of inertia?The moment of inertia of a rigid body—also referred to it as the mass moment of inertia, angular mass, 2nd moment of mass, or—most precisely—rotational inertia—determines the torque required for a desired angular acceleration about just a rotational axis, much like mass helps determine the force required for a desired acceleration.
From the given information in the question,
Mass, m = 0.26 kg and
Radius, R = 0.012 m.
The MOI of sphere, I = 2/5 mR²
I = 2/5 (0.26)(0.012)²
I = 0.149 × 10⁻⁵ kg-m².
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Suppose the force of gravity on the earth is
10m/s2 and on the moon is 2m/s². If the
weight of an object on the earth is 200N
What will be its weight on the moon.
If the weight of an object on the earth is 200N, its weight on the moon will be 40 N
W = m g
W = Weight
m = Mass
g = Acceleration due to gravity
In Earth,
W = 200 N
g = 10 m / s²
m = W / g
m = 200 / 10
m = 20 kg
In moon,
g = 2 m / s²
W = 20 * 2
W = 40 N
Therefore, if the weight of an object on the earth is 200N, its weight on the moon will be 40 N
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what happens to a light wave that travels through glass and strikes a boundary with water at a 45 angle
How many joules are needed to change the temperature of 100 g of water from 20 c to 40 c?.
To raise the temperature of 100g of water from 20C to 40C, 8.4k joules are required.
A joule is the amount of energy expended when a one-newton force is exerted across a one-meter distance. One joule is equal to one watt of electricity emitted or lost over the course of one second.
One joule is therefore not a lot of energy. The kilojoule (kJ), which has a value of 1,000 J per kilojoule, serves as the standard unit of energy since it is typical to measure energies in thousands of joules. The use of calories in nutrition is one such instance. A calorie is a common unit of measurement for dietary energy content.
A joule of energy transmitted to an object is equal to one newton of force. Additionally, it gauges energy.
It, therefore, has 8.4k joules.
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A 1 200 kg car travels along the road. Calculate its kinetic energy at: 54 km.h-¹
Answer:
Explanation:
Given:
m = 1 200 kg
V = 54 km/h = 15 m/s
___________
Wk - ?
Wk = m·V² / 2
Wk = 1200·15² / 2 = 270 000 J or Wk = 270 kJ
What is the resistance in a light bulb that has a 61 Volt battery and a current of 12 Amps?
Answer:
5.1 Ω
Explanation:
Basic Law v = ir
so v/i = r = 61/12 = 5.1 Ω
A 15.0-cm-long solenoid with radius 0.750 cm is closely wound with 600 turns of wire. The current in the windings is 8.00 A. Compute the magnetic field at a point near the center of the solenoid.
The magnetic field at a point near the center of the solenoid is equal to
4.02 x [tex]10^{-2}[/tex] Tesla
How do you calculate the magnetic field at the centre of a solenoid?A solenoid's magnetic field may be calculated using the formula B = 0 nl.The magnetic constant, 0 in the formula, has a value of 4 x 10-7 Hm-1 or 12.57 x 10-7 Hm-1. N in the formula stands for the number of turns, while I in the formula stands for the current flowing through the solenoid.It is discovered that there is no magnetic field close to the solenoid's center when it is held close to the sheet with its axis parallel to its breadth.B = μoIN / L is the equation for the magnetic field of a solenoid. N is the number of turns the solenoid has. I translates to coil current.Given details :
Length = 15.0 cm to m = 0.15 m.Radius = 0.750 cm.Number of turns = 600 turns.Current = 8.00 A.Mathematically, the magnetic field at a point near the center of the solenoid is given by this formula:
B = μoIN / L
Where:
is the vacuum permeability.N is the number of turns.L is the length.I is the current.Substituting the given parameters into the formula, we have;
B = [tex]\frac{4\pi * 10^{-7} * 600*8.00}{0.15}[/tex]
B = 4.02 x [tex]10^{-2}[/tex] Tesla
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which of the following is not a clue to the formation of the solar system? group of answer choices the earth has an unusually large moon the number of small rocky planets is equal to the number of large gas-rich planets the planets and moons generally orbit in the same plane there are a large number of small rocky and icy objects in different regions of the solar system
The answer that the moon of Earth is unusually large is correct.
As all other options, in one way or another, refer to factual information about our solar system, such as the fact that the number of small rocky planets is equal to the number of large gas-rich planets and that planets and moons typically orbit in the same plane.
What is a solar system ?The Sun and the planets and objects that orbit it make up the gravitationally bound system known as the Solar System. A massive interstellar molecular cloud gravitationally collapsed to make it 4.6 billion years ago. The Sun contains the great majority of the system's mass, with Jupiter holding the lion's share of the remaining mass.
What do u mean by small rocky planets?In our solar system, Earth, Mars, Mercury and Venus are terrestrial, or rocky, planets means they are made up of rock, stones and have territorial area.
So, now we can say that “the earth has an unusually large moon” is the correct option.
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what is the tallest wall that the player can clear (i.e., get the ball over) if the wall is 87.5 ~\text{m} m away horizontally?
The tallest wall that the player can clear is 26.224m.
calculation:-
Y = xtan∅ - g/ 2u²cos²∅
put x = 87.5, ∅ = 30° and u = 44.4m/s
we get y = 25.144m
So height above ground will be
25-144 + 1.08 = 26.224m.
A horizontally fired projectile means an object that is initially launched with full horizontal velocity. So if something is launched off a cliff, say straight horizontally without an initial vertical component it is a horizontally launched projectile.
The path followed by a moving object is called its trajectory. An object thrown horizontally will be accelerated downward under the influence of gravity. Gravitational acceleration is vertical only, not horizontal. A boat sailing on a river. Fired a bullet from the gun. Throw a ball or cannonball. Movement of billiard balls on the pool table.
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tyree is extremely good at identifying the motivations and intentions of the people he meets. according to gardner, tyree would most likely score very well on a test of intelligence.
Tyree is extremely good at identifying the motivations and intentions of the people he meets. according to Gardner, Tyree would most likely score very well on a test of interpersonal intelligence.
The ability to recognize differences and overcoming's in situations, to centre oneself in space, to reason, to make plans, to solve problems and set them aside, to think abstractly, to comprehend and produce ideas, to store information in the mind and then retrieve it later, and to learn from experiences are just a few of the many functions of intelligence.
Even in larger species like chimpanzees, intelligence-related abilities like language proficiency are clearly distinguishable from human abilities. Being born slim or intelligent is treated just as harshly as being born talented. To put it simply, intelligence is a hallmark of personal integrity.
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Two baby buggies are moving toward a head-on collision on level ground. The first buggy has a mass of 15 kg and is moving at a speed of 3 m/s. The second buggy has a mass of 15 kg and is moving at a speed of 5 m/s. The rugged rubber bumpers that are normally attached to the buggies have fallen off so that when they collide, they stick together. How fast (magnitude) are the buggies moving right after the collision?.
The buggies moving right after the collision will move at 5m/s and 3 m/s respectively.
An elastic collision is a collision in which there is no internet loss in kinetic energy within the gadget because of the collision. each momentum and kinetic electricity are conserved portions in elastic collisions.
Calculation:-
Since both, the biggie shave the same mass then according to the elastic collision their velocity will exchange upon each other
mass 1 = 15 kg
mass 2 = 15 kg
Velocity before collision
V1 = 3m/s
V2 = 5 m/s
Velocity after collision
V1 = 5 m/s
V2 = 3 m/s
Elastic collisions arise whilst both the momentum and kinetic energy are conserved, just like how billiard balls bounce off each different and move at the same speeds as earlier. Inelastic collisions appear whilst simplest the momentum is conserved but not the kinetic power.
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A group of students have decided that the amount of electricity used by the school should be reduced. The students want to develop a plan to solve this problem. What should the group do first?.
The first thing the student group should do is research the amount of electricity the school uses and where it comes from.
The students should then develop a plan to reduce the amount of electricity the school uses. The plan should include measures to reduce the school's reliance on electricity, such as promoting the use of solar power or wind power. The plan should also include measures to increase the efficiency of the school's electricity use, such as retrofitting the school's lighting or installing energy-efficient appliances. The students should then present their plan to the school administration and work with them to implement the plan.
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) consider a set of points, where most points are in regions of low density, but a few points are in regions of high density. if we define an anomaly as a point in a region of low density, then most points will be classified as anomalies. is this an appropriate use of the density-based definition of an anomaly or should the definition be modified in some way?
An outlier detection technique based on density Finding data items with behavior that deviates significantly from expectations is the process of outlier detection, sometimes referred to as anomaly detection.
These things are referred to as anomalies or outliers. Another helpful unsupervised machine learning approach is LOF, which instead of evaluating the full data distribution to identify outliers, does it in relation to particular neighborhoods ( Brewing et al., 2000 ). The nearest neighbor search is used by the density-based LOF technique to find the anomalous spots.
Anomaly detection methods, sometimes referred to as outlier detection, are becoming more and more common in the data mining industry nowadays.
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star a and star b have measured stellar parallax of 0.58 arc second and 0.73 arc second, respectively. which star is closer?
Star B is closer than star A, because 1/ 0.58 = 1.72 pc, while 1/.73 = 1.36 pc.
What is stellar parallax and distance measurement using stellar parallax?To calculate the distances to nearby stars, astronomers employ a phenomenon known as parallax. The apparent displacement of an object due to a change in the viewer's point of view is known as parallax. The distances between close stars can be calculated using this phenomenon. A nearer star will seem to move against the farther-off background stars as the Earth revolves around the Sun. By measuring a star's position once, then again six months later, astronomers can establish the apparent shift in location of that star. The apparent motion of the star is referred to as stellar parallax.
A straightforward correlation exists between the distance of a star and parallax angle:
[tex]d=\frac{1}{p}[/tex]
The distance d and parallax angle p are both measured in parsecs and arcseconds, respectively.
Stellar parallax of star A= 0.58 arcseconds
Stellar parallax of star B= 0.73 arcseconds
So, on applying the formula,
The distance of the star A= 1.72pc
And the distance of the star B= 1.36pc
Therefore, star B is closer than star A.
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A shipping container will be used to transport several 130-kilogram crates across the country by rail. the greatest weight that can be loaded into the container is 25500 kilograms. other shipments weighing 12100 kilograms have already been loaded into the container. which inequality can be used to determine cc, the greatest number of 130-kilogram crates that can be loaded onto the shipping container?
Answer:
below
Explanation:
130 x < = 25500 - 12100
130 x <= 13400
x <= 103
An Easy Jet aircraft is travelling at a constant cruising velocity of 170 ms-1 during a journey from Edinburgh to Barcelona. In order to land safely at Barcelona the aircraft must reduce its speed to 50 ms-1.
Calculate the time it takes to reduce the speed of the aircraft to 50 ms-1 if it decelerates at 0.15 ms-2. (3)
The time it takes to reduce the speed of the aircraft from 170 m/s to 50 m/s is 800 seconds
What is time?time is the measured or measurable period during which an action, process, or condition exists or continues.
To calculate the time it takes the jet to decelerete, we use the formula below.
Formula:
t = (v-u)/a........... Equation 1Where:
t = Time it takes the jet to deceleratev = Final speedu = Initial speeda = DecelerationFrom the question,
Given:
v = 50 m/su = 170 m/sa = -0.15 m/s²Substitute these values into equation 1
t = (50-170)/-0.15t = -120/-0.15t = 800 secondsHence, the time it takes to reduce the speed is 800 seconds.
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1. If a car is traveling westward with a constant velocity of 20 m/s, what is the net external force acting on it?
The net external force acting on a car that is traveling westward with a constant velocity of 20 m/s is 0
F = m a
a = v - u / t
F = Force
m = Mass
a = Acceleration
v = Final velocity
u = Initial velocity
t = Time
v = u = 20 m / s
a = ( 20 - 20 ) / t
a = 0
F = m * 0
F = 0
Force is the rate of change in momentum according to Newton's second law of motion. There is no momentum change in this motion. So there is no net force acting on the car.
Therefore, the net external force acting on the car is zero
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what kind of trend or pattern is obvious in the data? is there a consistent relationship between the volume and mass measurement
Densities are commonly used to characterize and infer the composition of various sorts of mixes as well as to distinguish between pure materials.
Density is often measured in grams per cubic centimeter. For instance, water has a density of 1 grams per cubic centimeter, compared to Earth's density of 5.51 grams. The kilograms per cubic meter unit is another way to express density (in metre-kilogram-second or SI units). A substance or object's mass is a measure of how much matter there is in it. The basic SI unit of mass is the kilogram (kg), although smaller quantities can also be measured in grams (g). Density is one of an object's most important and useful physical properties.
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the left side of the heart creates a pressure of 123123 mm hg by exerting a force directly on the blood over an effective area of 16.516.5 cm2. what force does it exert to accomplish this?
The Heart applies a force of 6.7 Newton over an effective area of 16.5cm² to achieve a pressure of 123mm of Hg.
The pressure that heart creates is 123mm Hg.
We know, 760 mm Hg = 10⁵ Pascals.
1 mm Hg = 10⁵/760 Pascals.
So, 123 mm Hg will be 123 x 10⁵/760 Pascals.
The effective area of the blood is 16.5 cm².
So, area = 16.5 x 10⁻⁴ m².
Force applied by the heart = Pressure x area
Force = 123 x 10⁵/760 x 16.5 x 10⁻⁴
Force = 26.7 N.
The force applied by the heart is 26.7 N.
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A ball is dropped of the side of a building and hits the ground 6.2 s after being dropped. How
tall is the building?
The height of the building is equal to 188.36 m.
What is the equation of motion?The equations of motion are used to describe the relationship between the velocity, acceleration (a), time (t), and displacement of a moving object.
The mathematical expressions of the equations of motions can be written as:
[tex]v= u + at\\S = ut + (1/2) at^2\\v^2-u^2 = 2aS[/tex]
Given, the time taken by the ball to reach the ground, t = 6.2 sec
Consider that H is the height of the building.
From the 2nd equation of motion, calculate how tall is the building.
H = ut + (1/2)gt²
H = 0 + (1/2)× 9.8× (6.2)²
H = 188.36 m
Therefore, the height of the building is equal to 188.36m.
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if the system produces 40,048 watts, what is the energy worth per day? assume electricity costs of $0.06 per kwh.
If the system produces 40,048 watts, then the energy worth per day would be 96.152 kWh, and the electricity cost per day would be $57.67.
According to the question given,
Power = 40,048 = 40.048 kW
Time = 1 day = 24 hours
Cost = $0.06 for one KWh
Energy = Power × time
Energy = 40.048 × 24 kWh
Energy = 961.152 kWh
The total cost for one day would be:
Cost = $(0.06 × 961.152)
= $57.67
So, the energy worth per day would be 96.152 kWh, and the electricity cost per day would be $57.67.
The kilowatt-hour (kWh) is a unit of energy equal to one kilowatt of power spent for one hour. The kilowatt-hour is not a standard unit in any formal system, but it is often used in electrical applications.
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