At the last stage of stellar evolution, a heavy star can collapse into an extremely dense object made mostly of neutrons. The star is called a neutron star. Suppose we represent the star as a uniform, solid, rigid sphere, both before and after the collapse. The star's initial radius was the solar radius 8.5×10 5
km; its final radius is 7.1 km. If the original star rotated with the solar rotation period 19 days, find the rotation period of the collapsed neutron star in the unit of millisecond.
Answers
At the last stage of stellar evolution, a heavy star can collapse into an extremely dense object made mostly of neutrons. the rotation period of the collapsed neutron star is approximately 0.5 milliseconds.
To find the rotation period of the collapsed neutron star, we can apply the principle of conservation of angular momentum. Since the neutron star is a rigid object, its angular momentum will remain constant before and after the collapse.
The formula for angular momentum (L) is given by the product of moment of inertia (I) and angular velocity (ω):
L = I * ω
Since the neutron star is assumed to be a uniform, solid, rigid sphere, its moment of inertia can be calculated using the formula for a solid sphere:
I = (2/5) * M * R²
Where M is the mass of the neutron star and R is its radius.
Now, let's consider the initial star and the collapsed neutron star:
For the initial star:
Initial radius (R_initial) = 8.5 × 10^5 km
Initial rotation period (T_initial) = 19 days
For the neutron star:
Final radius (R_final) = 7.1 km
Final rotation period (T_final) = unknown (to be calculated)
The mass (M) of the star remains the same before and after the collapse.
Using the conservation of angular momentum, we can equate the initial and final angular momenta:
I_initial * ω_initial = I_final * ω_final
Substituting the expressions for moment of inertia and angular velocity:
[(2/5) * M * R_initial²] * (2π / T_initial) = [(2/5) * M * R_final²] * (2π / T_final)
Simplifying the equation and canceling common factors:
(R_initial² / T_initial) = (R_final² / T_final)
Substituting the known values:
[(8.5 × 10^5 km)² / (19 days)] = [(7.1 km)² / T_final]
Converting the units to a common form:
[(8.5 × 10^5 km)² / (19 days)] = [(7.1 km)² / (T_final * 86,400 seconds/day)]
Solving for T_final:
T_final = [(7.1 km)² * (19 days) * (86,400 seconds/day)] / [(8.5 × 10^5 km)²]
Calculating the value:
T_final ≈ 0.5 milliseconds
Therefore, the rotation period of the collapsed neutron star is approximately 0.5 milliseconds.
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Related Questions
Suppose a blanket has a sock stuck to it due to static electricity. When you pull the sock off of the blanket, what happens to the potential energy between them?
Answers
Explanation:
When you pull the sock off of the blanket, the socks gain electrons out of blanket. This makes socks slightly negatively charged. The potential energy of the socks rise whereas potential energy of the blanket reduces. This happens because of exchange of electrons between socks and blanket.
5. Two magnets with opposite poles facing each other are held close to each other but are not touching. When released, the magnets snap together. When this happens, what evidence is there that energy is being transferred?
Answers
As the magnets move closer, the magnetic field lines between the magnets become more concentrated, and the force between the magnets becomes stronger. This results in an increase in the speed of the magnets as they move towards each other, which is evidence of the conversion of magnetic potential energy into kinetic energy.
Additionally, when the magnets snap together, there may be a sound or vibration that is produced. This is also evidence of energy being transferred, as the sound or vibration is the result of the kinetic energy of the moving magnets being transferred to the surrounding air molecules or other objects.
Explain why L0 is not measured to point X on the spring?
Answers
what is the name of the part of the microscope that the objectives are attached to? (choose the best answer)
Answers
The part of the microscope that the objectives are attached to is called the (C) nosepiece.
The nosepiece is a rotating mechanism located below the microscope's body tube. It holds the objectives, which are the lenses responsible for magnifying the specimen. The nosepiece typically has multiple positions, allowing the user to switch between different objective lenses for varying levels of magnification.
This convenient feature eliminates the need to manually remove and replace objectives when changing magnification. By rotating the nosepiece, different objectives can be brought into position above the specimen. This allows for quick and efficient adjustments in magnification without disrupting the viewing process.
Hence, the nosepiece plays a critical role in the microscope's functionality by providing a convenient way to switch between objectives and adjust the magnification level.
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Here is the complete question:
What is the name of the part of the microscope that the objectives are attached to? (Choose the best answer)
A. Ocular
B. Stage
C. Nosepiece
D. Arm
Global climate and weather patterns are driven by differences in the amount of heat energy in different areas of the Earth. Which statement best explains why different areas of the Earth have different amounts of heat energy?
The Earth receives different amounts of solar energy in different regions.
ocean currents and global wind patterns, which are caused by convection currents, most strongly affect a region's
climate
An area with an average annual temperature of more than 64°F and greater than 59 inches of annual rainfall would be an example of which type of climate?
tropical
Which of the following factors would affect the weather patterns of a region?
all of these
Water cycles from the atmosphere into the hydrosphere through precipitation. Water cycles from the hydrosphere back to the atmosphere through evaporation.
Which of the following is one way that these patterns can effect climate?
Areas located near a large body of water typically receive more precipitation than areas that are not located near water.
Convection currents, which affect weather and climate, are created by
the uneven heating of the Earth.
Which of the following statements best describes global temperature patterns?
The temperature of a specific region tends to change in fairly predictable patterns throughout a day and during the course of a year.
Seasonal changes in water temperature tend to remain within a narrow range. This is opposed to air temperature, which tends to fluctuate across a wide range. The relative stability of ocean temperatures helps to regulate the temperatures of coastal regions. Why can water remain within a narrow range of temperatures?
It has a high heat capacity.
The Sun's energy is critical to the Earth's climate and weather patterns because it drives the water cycle. Which stage of the water cycle is the Sun's energy most critical to?
evaporation
he polar climate zone is the coldest of the three zones. Why is this?
The polar climate zone is located between about 67°N latitude and the North Pole—this latitude zone receives less sunlight than the other two latitude zones.
Weather is a condition of the atmosphere at a particular time and place. Wind, rain, and cloud formations are all forms of weather phenomena. What is the primary source of energy for weather phenomena?
solar radiation
The equator tends to contain regions with hot climates. However, the Rwenzori Mountains, which are located close to the equator, are covered in ice caps. Why is the climate of the Rwenzori Mountains not hot?
Temperatures decrease with elevation
A number of factors work together to create climate. What are the two main factors to consider in determining the climate of an area?
temperature and precipitation
Answers
The best statement that explains why different areas of the Earth have different amounts of heat energy is that "Earth receives different amount of solar energy in different regions " .
In the question ,
it is given that ,
Global climate & weather patterns are driven by differences in amount of heat energy in different areas of Earth .
we have to find the true statement for the given cause .
we know that ;
Different parts in the Earth surface receive different amounts of sunlight . The Sun rays strike the Earth surface most directly at Equator.
that means Near the poles, the Sun rays strike surface at a slant due to which the rays spread over wide area.
The more focused rays are, more energy the area receives, and it will be more warmer .
Therefore , the correct statement to explain given reason is "Earth receives different amount of solar energy in different regions " .
The given question is incomplete , the complete question is
Global climate and weather patterns are driven by differences in the amount of heat energy in different areas of the Earth. Which statement best explains why different areas of the Earth have different amounts of heat energy ?
(a) The solar radiation from the Sun is equally distributed across the Earth at all times.
(b) The gravitational energy from the Sun varies greatly in different regions of the Earth.
(c) The Earth spins at different rates so the rotational energy of the Earth varies.
(d) The Earth receives different amounts of solar energy in different regions
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Plz answer and I will give Brainlyest
Answers
Answer:
true
Explanation:
Answer:
True.
Explanation:
determine the car’s instantaneous velocity at t=5s
Answers
Answer:
In the given graph,
Velocity is constant between 4 to 8 which is 2m/s
So, at t=5s
Instantaneous velocity=2m/s
Explanation:
hope this help u thank u
If you were to stare at a green dot for a relatively long period of time and then shift your gaze to a blank white screen, you would see a ________ negative afterimage. a. blue b. yellow c. black d. red
Answers
If you stare a green dot for a relatively long period of time and then shift your gaze to a blank white screen, you would see a red negative after image.
This is based on the theory of colour vision. It states that all the colours we see and perceive in the natural world are made up of three colour complexes that have the opposite effects. The complexes are the red-green complex, the blue- yellow complex and the black-white complex.
This means that when we perceive one colour, for example, let us take green, the other colour won't be visible. This is what happened here. Later we get to see red and green gets vanished.
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If vector P was fixed but the direction of Vector Q could be changed, for which value of tetha will the resultant force have a maximum value ?
Answers
The value of tetha (θ) in which the resultant force will have a maximum value is 180 degrees.
What is maximum value of the resultant vector?
The maximum value of the resultant vector is calculated by applying Parallelogram law of vector addition as shown below;
R² = a² + b² - 2ab( cosθ )
where;
a is the magnitude of the first optionb is the magnitude of the second optionθ is the angle of inclination of the vectorwhen θ is 0, the vector will have a minimum value, when θ = 180, the vector will have a maximum value as shown below.
R² = a² + b² - 2ab( cosθ )
R² = ( 250² ) + ( 150² ) - 2(250 x 150 ) x cos (180)
R² = 160,000
R = √ (160,000)
R = 400 N
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Identify all the forms of energy in the picture below
identify thermal energy, mechanical energy, radiant energy, electrical energy, sound energy, and chemical energy
Answers
Answer:
we are going to focus on just a few. • Heat energy ( Thermal). • Mechanical energy. • Light (Radiant) energy. • Electrical energy. • Sound energy. • Chemical energy
you now put both the red and green cellophane pieces over one of hte flashlights in problem 27. if you shine the flashlight beam o na white wall, what color will you see? explain
Answers
Placing red and green cellophane over a flashlight lens creates a yellow beam of light on a white wall due to the combination of opposite colors on the color wheel.
In problem 27, we had a flashlight shining on a white wall with a red cellophane piece over the flashlight lens, producing a red light beam. When a green cellophane piece is also placed over the lens, both red and green cellophane pieces filter the light, and we are left with the colors that result from the combination of red and green light.
When red and green light combine, they produce yellow light. Therefore, when we shine the flashlight beam on a white wall with both red and green cellophane pieces over the lens, we will see a yellow beam of light.
This happens because red, green, and blue are the primary colors of light, and when they combine in different ways, they can produce other colors. Red and green light combine to produce yellow because they are opposite on the color wheel, and when they mix, they cancel out each other's opposing colors, leaving only the color in the middle, which is yellow.
In summary, when we put both red and green cellophane pieces over the flashlight lens, we get a yellow beam of light when we shine the flashlight on a white wall. This happens because red and green light combine to produce yellow light, which is a result of their opposite positions on the color wheel.
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Write an argument of any one
Do you think parallel universes exist?
or
Do you think portals exist?
Answers
u might never know. It might or might not exist in conclusion.
what power does the defibrillator deliver to the body?
Answers
A defibrillator is a medical device used to deliver an electric shock to the heart in order to restore normal heart rhythm during a life-threatening condition called cardiac arrest. The power delivered by a defibrillator is typically expressed in terms of energy rather than power.
The defibrillator delivers a high-energy electric shock, measured in joules (J), to the body. The energy delivered during defibrillation is used to depolarize the heart muscles and allow the natural pacemaker of the heart to resume control over the heart rhythm.
The energy delivered by a defibrillator can vary depending on the specific device and the protocol being followed. Typically, the initial shock delivered by a defibrillator ranges from 120 to 200 joules. However, subsequent shocks may require higher energy levels.
It's important to note that the power of the defibrillator is determined by the rate at which energy is delivered. Power is the rate of energy transfer, measured in watts (W). The power delivered by a defibrillator is typically very high for a very short duration, allowing for the rapid delivery of the required energy to the heart.
Overall, while the defibrillator delivers a high-energy electric shock measured in joules, the power of the device depends on the rate at which the energy is delivered, and it is typically very high for a very short duration.
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Which electric circuit arrangement will light the bulb? A. Two ends of a bulb are attached to the positive pole of two different batteries. B. Two ends of a bulb are attached to the positive and negative poles of the battery respectively. C. Two ends of a bulb are attached to the positive and negative poles of the battery respectively. D. Both the ends of the bulb are attached to the positive pole of the battery.
Answers
Answer:
B. Two ends of a bulb are attached to the positive and negative poles of the battery
Explanation:
A 0.50-kg ball, attached to the end of a horizontal cord, is rotated in a circle of radius 1.9 m on a frictionless horizontal surface. If the cord will break when the tension in it exceeds 85 N, what is the maximum speed the ball can have?
Answers
Answer:
\(\boxed {\boxed {\sf 18 \ m/s}}\)
Explanation:
The ball is moving in a circle, so the force is centripetal.
One formula for calculating centripetal force is:
\(F_c= \frac{mv^2}r}\)
The mass of the ball is 0.5 kilograms. The radius is 1.9 meters. The centripetal force is 85 Newtons or 85 kg*m/s².
\(F_c\)= 85 kg*m/s²m= 0.5 kg r= 1.9 mSubstitute the values into the formula.
\(85 \ kg*m/s^2 = \frac{0.5 \ kg *v^2}{1.9 \ m}\)
Isolate the variable v. First, multiply both sides by 1.9 meters.
\((1.9 \ m)(85 \ kg*m/s^2) = \frac{0.5 \ kg *v^2}{1.9 \ m}*1.9 \ m\)
\((1.9 \ m)(85 \ kg*m/s^2) = {0.5 \ kg *v^2}\)
\(161.5 \ kg*m^2/s^2 = 0.5 \ kg*v^2\)
Divide both sides by 0.5 kilograms.
\(\frac {161.5 \ kg*m^2/s^2}{0.5 \ kg} = \frac{0.5 \ kg*v^2}{0.5 \ kg}\)
\(\frac {161.5 \ kg*m^2/s^2}{0.5 \ kg} =v^2\)
\(323 \ m^2/s^2 = v^2\)
Take the square root of both sides of the equation.
\(\sqrt {323 \ m^2/s^2} =\sqrt{ v^2\)
\(\sqrt {323 \ m^2/s^2} =v\)
\(17.9722007556 \ m/s =v\)
The original measurements have 2 significant figures, so our answer must have the same.
For the number we found, 2 sig fig is the ones place. The 9 in the tenth place tells us to round the 7 to an 8.
\(18 \ m/s =v\)
The maximum speed is approximately 18 meters per second.
Please help me with this, it's a Kinematics Equation 2 problem!
Answers
The distance covered by the object is given as,
\(d=ut+\frac{1}{2}at^2\)Plug in the known values,
\(\begin{gathered} d=(0\text{ m/s)(9 s)+}\frac{1}{2}(2m/s^2)(9s)^2 \\ =0\text{ m+}81\text{ m} \\ =81\text{ m} \end{gathered}\)Thus, the distance covered by the object is 81 m.
Inside a 138 mm x 346 mm rectangular duct, air at 17 N/s, 20 deg
C, and 112 kPa flows. Solve for the volume flux if R = 28.5 m/K.
Express your answer in 3 decimal places.
Answers
The volume flux inside the rectangular duct is 0.028 m³/s.
Volume flux, also known as volumetric flow rate, is a measure of the volume of fluid passing through a given area per unit time. It is commonly expressed in cubic meters per second (m³/s). To calculate the volume flux in the given scenario, we can use the formula:
Volume Flux = (Air flow rate) / (Cross-sectional area)
First, we need to calculate the cross-sectional area of the rectangular duct. The area can be determined by multiplying the length and width of the duct:
Area = (138 mm) * (346 mm)
To maintain consistent units, we convert the dimensions to meters:
Area = (138 mm * 10⁻³ m/mm) * (346 mm * 10⁻³ m/mm)
Next, we can calculate the air flow rate using the given information. The air flow rate is given as 17 N/s, which represents the mass flow rate. We can convert the mass flow rate to volume flow rate using the ideal gas law:
Volume Flow Rate = (Mass Flow Rate) / (Density)
The density of air can be determined using the ideal gas law:
Density = (Pressure) / (Gas constant * Temperature)
where the gas constant (R) is given as 28.5 m/K, the pressure is 112 kPa, and the temperature is 20 degrees Celsius.
With the density calculated, we can now determine the volume flow rate. Finally, we can divide the volume flow rate by the cross-sectional area to obtain the volume flux.
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Ren runs a hamburger stand and needs to clean up a season’s worth of grease buildup on the range hood over his griddle. explain what he should look for in a cleaning product that can handle a layer of grease
Answers
Answer:
A cleaning product that contains a base.
Explanation:
Ren should use a cleaning product that contains a base. This is because bases readily react with lipids (fats), the kind of compound that makes up grease. A base would break down the grease, forming soap, which would then easily wash away.
Two ice skaters stand facing each other at rest on a frozen pond. They push off against one another and the 49 kg skater acquires a speed of 2. 10 m/s. If the other skater acquires a speed of 3. 81 m/s, what is her mass in kilograms?
Answers
Her mass is approximately equal to 27 kilograms.
How do you prove that?First of all, you need to understand that momentum is a conserved quantity and the solution to this problem involves elastic collision.
Momentum can be defined as p = mv where p is momentum, m is mass, and v is velocity. Just like energy, momentum is a physical quantity that is conserved in an isolated system. Momentum is conserved as a result of Newton's third law, which states that \(F_A=-F_B\).
You are given that the ice skaters bounce off each other, meaning the collision is elastic. Remember that in an elastic collision, m₁u₁ + m₂u₂ = m₁v₁ + m₂v₂ where
m₁ is the mass of the first body, m₂ is the mass of the second body,u₁ is the initial velocity of m₁,u₂ is the initial velocity of m₂,v₁ is the final velocity of m₁, andv₂ is the final velocity of m₂.Suppose that m₁ = 49 kg, m₂ = x, u₁ and u₂ = 0 m/s, v₁ = 2.1 m/s, and v₂ = 3.81 m/s. Then the mass of the other ice skater is as follows:
49 · 0 + x · 0 = 49 · 2.1 + x · 3.81
0 = 102.9 + 3.81x
3.81x + 102.9 = 0
3.81x = -102.9
x ≈ -27
Since a mass value can't be negative, the absolute value of x is 27. Therefore, it's her actual mass in kilograms.
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One acre is equal to 43560ft².How much is it in m²?
Answers
1 ft²= 0.09290304m²
so:
43560ft²= 0.09290304m²×43560
= 4,046.8564224 m²
Answer: 4046.9m² (approx.)
Explanation:
An acre is 43560 ft², but the US has two feet, the International foot, and the (old) Survey foot. Since 1983, the answer varies by state according to which foot the State has adopted for surveying. (Previously, it was always the Survey foot).
International: 43560 ft² x (0.3048 m/ft)² = 4046.856 422 m²
Survey: 43560 ft² x (1200/3937 m)² = 4046.872 610 m²
Both round to 4046.9 m² if that’s good enough, but there is a tiny difference.
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When wind turns the blades of a wind turbine and then this energy is used to power homes, this is an example of an energy transfer from ________ to ________ energy. a mechanical, electrical b radiant, thermal c electrical, mechanical d thermal, chemical
Answers
When wind turns the blades of a wind turbine and then this energy is used to power homes, this is an example of an energy transfer from mechanical to electrical energy.
What is Wind power?In order to produce electricity, wind turbines are mostly used in wind power or wind energy. In comparison to burning fossil fuels, wind energy is a well-liked, environmentally friendly, renewable energy source.Wind energy, like all other forms of energy production, has the potential to have negative effects on the environment, including the loss, fragmentation, or degradation of habitat for animals, fish, and plants. Additionally, flying animals like birds and bats could be harmed by turbine blades that are in motion.Wind energy is economical.After the production tax credit, land-based utility-scale wind is one of the least expensive energy sources on the market at 1-2 cents per kilowatt-hour.Learn more about wind power here:
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A 58 kg counterweight on a trebuchet is raised to a height of 3.1 meters. Calculate how much potential energy it has
Answers
Answer:
1762.04J
Explanation:
Given parameters:
Mass of counterweight = 58kg
Height = 3.1m
Unknown:
Amount of potential energy = ?
Solution:
The potential energy of a body is the energy due to the position of the body.
It is given as:
Potential energy = mass x acceleration due to gravity x height
So;
Potential energy = 58 x 9.8 x 3.1 = 1762.04J
A graph titled Position versus Time shows time in seconds on the x axis, numbered 0 to 5, and position in meters on the y axis, numbered 0 to 15. The graph is a straight line from the (0, 3) to (4, 15).
Based on the information presented in the graph, what is the velocity of the object?
Answers
Answer:
3 m/s
Explanation:
distance (rise) over time (run) gives speed, that is velocity
it can be found using the gradient (m) formula
m=(y2-y1)/(x2-x1)
m=(15-3)/(4-0) =12/4=3 m/s
Answer:
3 m/s
Explanation:
.....as the answer for your question is 3m/s ..
THANK YOU..
Question 14 (1 point)
Which answer below shows the number 75,678.95 cm rounded to 3 significant figures?
a
Ob
Oc
d
75,700.cm
757 cm
756 cm
75,700 cm
Answers
The correct answer is (D)
What does SF mean in physics?
"The term significant figures actually refers to particular digits in a number. These are sometimes called significant digits."
How to apply for 3 significant figures :
"The third significant figure of a number is the digit after the second significant figure. … We round a number to three significant figures in the same way that we would round to three decimal places. We count from the first non-zero digit for three digits. We then round the last digit."
Given number of 75678.95 cm
First Significant figure = 70,000 cm
Second Significant figure = 75,000 cm
Third Significant figure = 75,700 cm
So,correct option (D)
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How does increasing the temperature affect the speed of sound in air?
A. It decreases the speed of sound.
B. It causes sound waves to completely stop.
C. It increases the speed of sound.
D. The speed of sound does not depend on the temperature.
Answers
When the temperature is high, the molecules move around a lot, which indicates that they have a lot of kinetic energy. High velocity causes the molecule to vibrate more quickly, which accelerates the sound wave.
The correct answer is :C.
How does an increase in air temperature influence the timing of sound?Temperature is another aspect that impacts sound speed. Like voice, heat is almost like a kinetic energy. Molecules vibrate more quickly at higher temperatures due to having more energy, which speeds up sound wave propagation.
What connection exists between temperatures and sound velocity?The temperature has an influence on the airspeed as well. Like sound, heat is almost like a kinetic energy. Atoms move more swiftly at higher temperatures because they have more energy. Since molecules vibrate more fast, sound waves may travel more quickly.
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Which circuit does not allow current to flow through it?
A. Circuit D
B. Circuit B
C. Circuit A
D. Circuit C
Answers
Answer:
circuit A
Explanation:
because it is not a complete circuit
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Answer:
Circuit A (answer C), does not allow current to flow, because there is no connection between the charge and ground (or positive and negative).
A radioactive decay is illustrated. Which radioactive emission is a product of this decay?
A)Alpha
B)beta
C)gamma
D)positron
Answers
The radioactive decay is shown in the image attached to this answer
Answer:
Alpha
Explanation:
An alpha decay is said to have occurred when the mass number of the daughter nucleus decreases by four units and the atomic number of the daughter nucleus decreases by two units.
If we look at the equation from left to right, we will notice that the mass number of the daughter nucleus decreased by four units and the atomic of the daughter nucleus number by two units compared to that of the parent nucleus leading to the emission of an alpha particle.
if a neutral atom has an atomic number of 18,how many protons does it have in the nucleus
Answers
Answer:
18
Explanation:
atomic number = number of protons
which process is responsible for earth's magnetic field? in which layer does this process occur? which process is responsible for earth's magnetic field? in which layer does this process occur? crystallization; inner core subduction; lower mantle radiation; upper mantle convection; outer core
Answers
Convection in the outer core is the mechanism generating the magnetic field of the Earth.Convection in the outer core is hence the cause of the Earth's magnetic field.
Convection happens as a result of the inner core's heat production and the outer core's gradual cooling. The molten iron and nickel rise with the heat towards the top of the outer core, where it cools and gets denser, which forces it to sink back down. Convection currents are set up by the molten metal moving in this way.
Electric currents are produced by the electrically conducting fluid's motion in the outer core. The dynamo effect is a mechanism by which these electric currents produce a magnetic field. The Earth's magnetic field is created and maintained by the ongoing mobility of the molten metal in the outer core and the interaction of these electric currents.
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The
of a wave is the amount of time it takes one wavelength to pass a point.