Use the radius-luminosity-temperature relation to calculate the radius of a red supergiant with temperature 3000 K and total luminosity 60000 times that of the Sun. (Sec. 17.3 in the textbook)Express your answer using two significant figures.R= ___________ AU
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A red supergiant with a temperature of 3000 K and a total luminosity of 60000 times that of the Sun, using the radius-luminosity-temperature relationship the radius is 700 AU (to two significant figures).
The radius-luminosity-temperature relation can be used to calculate the radius of a red supergiant. Given a temperature of 3000 K and a total luminosity of 60000 times that of the Sun, the radius can be calculated as follows:
R = (L/Lsun)\(^{\frac{1}{2} }\)* (Teff/Teff,sun)⁻²
where R is the radius of the star, L is the luminosity, Teff is the effective temperature, and Lsun and Teff, sun are the luminosity and effective temperature of the Sun, respectively.
Substituting the given values, we get:
R = (60000)\(^{\frac{1}{2} }\) * (3000/5777)⁻²
R = 4657.88 AU
Therefore, the radius of the red supergiant is approximately 4700 AU (two significant figures).
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Related Questions
what is electricity?write any two defects of a simple cell.
Answers
Answer:
Electricity is the set of physical phenomena associated with the presence and motion of matter that has a property of electric charge. Electricity is related to magnetism, both being part of the phenomenon of electromagnetism, as described by Maxwell's equations.
What choice characterizes the behavior of a superconducting magnet as they warm up?
Become stronger
Become regular conductors
Become weaker
Temperature has no effect
Answers
What is the proper unit for gravitational potential energy?Question 16 options:gravitonsjoulesnewtonsmeters
Answers
Answer:
Joules
Explanation:
The unit for Energy is Joules, which is equal to kg m²/s².
The gravitational potential energy is calculated as:
\(Ep=\text{mgh}\)Where m is mass (kg), g is gravity (m/s²) and h is the height (m). So, the unit of the potential energy is:
\(kg\cdot\frac{m}{s^2}\cdot m=kg\cdot\frac{m^2}{s^2}=\text{Joules}\)Therefore, the answer is joules.
During a spring tide, the high tides are very high and the low tides are very low. Why does this occur?
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Image result for During a spring tide, the high tides are very high and the low tides are very low. Why does this occur?
In both cases, the gravitational pull of the sun is 'added' to the gravitational pull of the moon on Earth, causing the oceans to bulge a bit more than usual. This means that high tides are higher and low tides are lower than average. These are called 'spring tides. '
brainliest please?
Answer:
In both cases, the gravitational pull of the sun is 'added' to the gravitational pull of the moon on Earth, causing the oceans to bulge a bit more than usual. This means that high tides are higher and low tides are lower than average. These are called 'spring tides. '
A kitchen has a water supply, an electricity supply and electric lighting there are several electrical appliances in the kitchen including a toaster, akettle a clothes iron, a microwave oven and a dishwasher discuss three hazards of using electricity in this kitchen ?
Answers
The hazards of using electricity in this kitchen include the following below:
Risk of electric shocks: These electrical appliances use an electric source for their various functions in which electric current flows through them when
turned on. Exposure and contact of the naked wire with individuals will bring
about shock.
Risk of burns: The kitchen has various heating appliances such as toaster,
kettle,iron and oven which may result in burns if not carefully handled.
Risks of fire : The heat and electric current from these appliances can trigger a spark and fire which may raze down the building is also another hazard.
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Explain how displacement depends on intial velocity and time
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Answer:
Explanation:
displacement is the shortest distance between the initial and final position and velocity is the ratio of distance to the time taken. displacement will be zero if the body comes back to its initial position
Consider a bar, of length 3.5 m, shown in the figure, is constrained to locate about its left end. In addition to the force exerted at the left end responsible for this constraint, three forces are acting on the bar that generate torques. The magnitudes of the first two forces are 17 N and 37 N, and the first force is acting on the end of the bar at an angle of 22° as shown.
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the bar in this scenario is subject to multiple forces that generate torques, with the constraint force at its left end being the primary factor that determines its motion and behavior.
The bar in this scenario is subject to multiple forces that generate torques. One of these forces is the constraint force that keeps the bar fixed at its left end. The other two forces exerted on the bar are causing it to rotate and generate torques. The force with a magnitude of 17 N and the angle of 22° creates a torque that is perpendicular to the plane of the bar and contributes to its rotational motion. Similarly, the force with a magnitude of 37 N also generates a torque that contributes to the overall rotational motion of the bar.
It is important to note that the forces acting on the bar are subject to constraints. The bar is constrained to rotate around its left end, which limits the motion and behavior of the forces exerted on it. The length of the bar and the angles of the forces also play a role in determining the magnitude and direction of the torques generated.
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Which of the following descriptions best describes all of the factors that need to be considered when determining an object’s terminal velocity?(1 point) Responses the object’s weight, length, and width the object’s weight, length, and width air density and the object’s drag coefficient air density and the object’s drag coefficient the object’s weight and area it presents, as well as air density the object’s weight and area it presents, as well as air density the object’s weight and area it presents
Answers
The object’s weight and area it presents, as well as air density.
The correct option is C.
What is velocity and example?Velocity may be defined as the rate that a thing travels in a certain direction. as the speed of a car driving north on a highway or the pace at which a rocket takes off. the proportion between the distance travelled in a simple machine by the point where the effort being applied to the distance moved in the same time by the place where the load is applied.
Who first defined velocity?Galileo Galilei, an Italian physicist, is recognized with being the initial person to calculate speed by dividing it by the distance travelled and the time required. Galileo defined speed as the amount of distance travelled in a given amount of time.
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The complete question is -
Which of the following descriptions best describes all of the factors that need to be considered when determining an object’s terminal velocity?
A) The object’s weight, length, and width
B) Air density and the object’s drag coefficient
C) The object’s weight and area it presents, as well as air density
D) The object’s weight, length, width, and area it presents, as well as air density and the object’s drag coefficient
HELP PLEASE!!!!
Research has shown that it is important to get exercises from the following areas:
a.
Endurance, strength, bone strengthening, and flexibility.
b.
Physical activity, strength, aerobics, and flexibility.
c.
Strength, muscle strengthening, cardio and flexibility.
d.
Bone strengthening, cardio, yoga, and flexibility
Answers
Answer:
a kasi a dapat a
Explanation:
a tama sa maka tulong
Answer:
A
Explanation:
Other options contain some type of exercises while option A contains the benefits of exercises.
please HELP ME!! i will give brainliest :)
Medical imaging of your bones and some other body parts uses a type of electromagnetic wave that
can pass through matter and produce two-dimensional images on a detector behind the body part. What
type of electromagnetic radiation does this process use? How is the image produced?
Answers
Answer:
It uses x-rays. The image is produced by polarizing exciting hydrogen nuclei of water molecules in the human tissue which will produce the image.
Answer:
It uses x-rays. The image is produced by polarizing exciting hydrogen nuclei of water molecules in the human tissue which will produce the image.
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10. A toy car travels 63 m during 5.1 s at a constant speed. What is the speed of the toy car? Round your answer to the nearest thousandth, if necessary,
Speed -
Answers
Answer:
speed = 12.353 m/s
Explanation:
\(speed = \frac{distance}{time} \)
distance = 63 m
time = 5.1 s
substitute the values into the formula
\(speed = \frac{63 \: m}{5.1 \: s} \)
speed = 12.353 m/s
mix 4 L of 30°C water is 6 L of 40°C water and you’ll have water at what temperature?
Answers
Answer:
dont know
Explanation:
need points
A negatively charged rod is brought near a metal sphere that is not grounded. when the rod is taken away, the metal sphere will have:________
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A negatively charged rod is brought near a metal sphere that is not grounded. When the rod is taken away, the metal sphere will have a positive charge.
This is due to the process of electrostatic induction, which occurs when a charged object is brought near a neutral object. The negatively charged rod repels the electrons in metal sphere, causing them to move away from the rod and towards the opposite side of the sphere. This leaves side of the sphere closest to the rod with a positive charge. This process of electrostatic induction is used in a variety of applications, including in the creation of electric generators and capacitors, and is an important concept in the study of electromagnetism.
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A car is running at the speed of 45km/hr see a child 25 meter ahead and suddenly apllies a brakes. If the retradation of the car is 2 meter per second square,is the child spared?
Answers
Answer:
The car stops in 7.78s and does not spare the child.
Explanation:
In order to know if the car stops before the distance to the child, you take into account the following equation:
\(x=x_o+v_ot-\frac{1}{2}at^2\) (1)
vo: initial speed of the car = 45km/h
a: deceleration of the car = 2 m/s^2
t: time
xo: initial distance to the child = 25m
x: final distance to the child = 0m
It is necessary that the solution of the equation (1) for time t are real.
You first convert the initial speed to m/s, then replace the values of the parameters and solve the quadratic polynomial for t:
\(45\frac{km}{h}*\frac{1h}{3600s}*\frac{1000m}{1km}=12.5\frac{m}{s}\)
\(0=25+12.5t-2t^2\\\\2t^2-12.5t-25=0\\\\t_{1,2}=\frac{-(-12.5)\pm \sqrt{(-12.5)^2-4(2)(-25)}}{2(2)}\\\\t_{1,2}=\frac{12.25\pm 18.87}{4}\\\\t_1=7.78s\\\\t_2=-1.65s\)
You take the first value t1 because it has physical meaning.
The solution for t is real, then, the car stops in 7.78s and does not spare the child.
A car has a constant acceleration of 5.6 m/s^2, it starts from test and reaches a speed of 280m/s, find the distance travelled by the car
Answers
Initial speed (u) = 0 m/s (Starts from rest)
Final speed (v) = 280 m/s
Acceleration (a) = 5.6 m/s²
By using equation of motion, we get:
\( \bf \longrightarrow {v}^{2} = {u}^{2} + 2as \\ \\ \rm \longrightarrow {280}^{2} = {0}^{2} + 2 \times 5.6 \times s \\ \\ \rm \longrightarrow 78400 = 11.2s \\ \\ \rm \longrightarrow 11.2s = 78400 \\ \\ \rm \longrightarrow s = \dfrac{78400}{11.2} \\ \\ \rm \longrightarrow s = 7000 \: m \\ \\ \rm \longrightarrow s = 7 \: km\)
\( \therefore \) Distance travelled by the car (s) = 7 km
Ohm's Law relates the following:
A) current, mass, and time
B) volts, amperes and resistance
C) resistivity, area and length
D) resistance, current, and power
Answers
Ohm's Law relates the following: volts, amperes, and resistance. Ohm's Law relates the following: volts, amperes, and resistance.
Ohm's Law states that the current (I) flowing through a conductor between two points is directly proportional to the voltage (V) across the two points and inversely proportional to the resistance (R) of the conductor. The formula for Ohm's Law is: V = IR.
In simpler terms, this means that if you increase the voltage, the current will also increase, but if you increase the resistance, the current will decrease. It can be mathematically expressed as I = V/R, where I is the current in amperes, V is the voltage in volts, and R is the resistance in ohms. This relationship is extremely important in understanding and designing electrical circuits. I hope this long answer helps to explain Ohm's Law!
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Analyze data table #1 and then create a line graph comparing speed and time.
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Which can be observed both on Earth and in an accelerating ship in space that is free from the effect of any gravitational field? Check all that apply.
chairs floating in midair
apples falling from trees
people's feet touching the ground
sky divers moving toward the ground
balls bending downward after being thrown
Answers
Answer:
apples falling from trees people's feet touching the ground sky divers moving toward the ground balls bending downward after being thrownExplanation:
When a space ship is accelerating in space, there is a force known as Inertia that kicks in. Inertia will mirror the effects of gravity on the ship even if there is no gravitational field effect such that anything that would happen where there is gravity, would continue to happen.
This means that apples will fall from trees, people's feet will touch the ground, sky divers will be pulled downwards and balls will bend downwards when thrown as well. These are the same effects expected on earth where gravity pulls things towards the earth's core.
Answer:
B,C,D,E
apples falling from trees
people’s feet touching the ground
sky divers moving toward the ground
balls bending downward after being thrown
correct on EDGE2021
a box is being pulled to the right. the free body diagram is shown. what is the magnitude of the kinetic frictional force? 25 n 125 n 375 n 500 n
Answers
The magnitude of the kinetic frictional force acting on the box is approximately 9.8 N.
To calculate the magnitude of the kinetic frictional force, we can use the formula:
Frictional force = coefficient of kinetic friction * normal force,
where the normal force is equal to the weight of the box.
The weight of the box can be calculated using the formula:
Weight = mass * gravitational acceleration,
where the gravitational acceleration is approximately \(9.8 m/s^2\).
Substituting the given values, we have:
Weight = 5 kg * \(9.8 m/s^2\) = 49 N.
Now we can calculate the magnitude of the kinetic frictional force:
Frictional force = 0.2 * 49 N = 9.8 N.
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--The complete Question is, A box is being pulled to the right with a force of 100 N. The box experiences a kinetic frictional force. The mass of the box is 5 kg and the coefficient of kinetic friction between the box and the surface is 0.2. What is the magnitude of the kinetic frictional force acting on the box? --
#4: A friend is wearing a pair of mirrored sunglasses whose convex surface has a focal length of (-20.0)cm. If your face is 40.0 cm from the sunglasses, how far behind the sunglasses is your image?
Answers
The image distance is negative, this means the image is formed behind the mirror, at a distance of 13.33 cm behind the sunglasses.
Since the sunglasses have a convex surface, we can use the mirror equation:
1/f = 1/do + 1/di
where f is the focal length of the mirror, do is the object distance (the distance between the object and the mirror), and di is the image distance (the distance between the mirror and the image).
In this case, f = -20.0 cm (since the mirror is convex), do = 40.0 cm (since your face is 40.0 cm from the sunglasses), and we want to find di.
Substituting these values into the mirror equation, we get:
1/(-20.0 cm) = 1/(40.0 cm) + 1/di
Simplifying this equation, we get:
-0.05 = 0.025 + 1/di
Subtracting 0.025 from both sides, we get:
-0.075 = 1/di
Dividing both sides by -0.075, we get:
di = -13.33 cm.
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A student connects a coil of insulated wire to a galvanometer. What would be seen if a bar magnet with its north pole towards one face of the coil is:(a) moved quickly towards it?(b) moved quickly away from the coil?(c) placed near the face of the coil?Name the phenomenon involved.
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The galvanometer briefly swung to one side. The galvanometer is in the other way. There is no galvanometer deflection. Electromagnetic induction is the relevant phenomenon. The galvanometer is in the opposite direction from that in the previous case. There is no galvanometer deflection.
The observations that will occur for each choice when a coil of insulated copper wire is coupled to a galvanometer are as follows:
(I) Electromagnetic induction will cause the coil to create an electric current if a bar magnet is put into it.
(ii) If a bar magnet is removed from the inside, electromagnetic induction will again induce current in the copper wire, but this time the direction of the current in the galvanometer will be reversed.
(iii) If a bar magnet is kept stationary inside the coil, no current is produced, and as a result, the galvanometer does not deflect.
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If a load of 5 kg covers a distance of 50m in 2 min, what is the power? (g=10m/s)
Answers
Explanation:
the answer is above with its si unit
A plane is traveling at 300 m/s. How far will it travelin 1 hour?
Answers
Answer:
1080000
Explanation:
300 x 60s=18000m/minute
18000 x 60min=1080000m/h
Explanation:
Suppose you live in the united states and you see a crescent moon in your evening sky tonight. What will a friend in south america see tonight?.
Answers
Calculate the acceleration of a turtle going from 0.3 m/s to 0.7 m/s in 30 seconds.
Answers
\(\\ \sf\longmapsto Acceleration=\dfrac{v-u}{t}\)
\(\\ \sf\longmapsto Acceleration=\dfrac{0.7-0.3}{30}\)
\(\\ \sf\longmapsto Acceleration=\dfrac{0.4}{30}\)
\(\\ \sf\longmapsto Acceleration=0.01m/s^2\)
Information about mars' moons.
Answers
Answer:
mars is a fourth planet of the sun and the second planet in the solar system
moon is a natural satellite of the earth it isthe fifth largest moon in the solar system
Which of the following is an example of an opposing force?
A.Gravity pulling a ball down a hill
B.Wind blowing a leaf off of a tree
C.Gravity holding a rock still on the ground
D.Water pushing against someone as they wade through a pool
Answers
There's more to motion than simply changing position. True Or False
Answers
Answer: I think that it is False, if its wrong I am sorry.
Explanation:
Why can we use regular air to
make liquid oxygen even though
it is a mixture of different
gases?
Answers
Answer:
The usual way to do this is to pass oxygen gas from a compressed gas cylinder through a coil of hollow copper pipe which is submerged in liquid nitrogen. The copper coil is a good conductor of heat and has a large surface area. Liquid oxygen is then usually collected in a thermos flask.
What is the magnitude of the acceleration caused by the force of kinetic
friction acting on a box sliding across a level table? The coefficient of friction
is μ = 0. 3
Answers
Note Friction couneracts the motion and ded-ucts.
What is the straight-forward meaning of magnitude?The definition of magnitude is "how much of a quantity." In order to compare the speeds of an auto-mobile and a bic-ycle, for example, the amplitude can be utilized. It can be used to describe how far an object has trav-eled or how much an object weighs in terms of the its magnitude.
What does force magnitude mean in physics?Consider the following sce-nario: the force is 10 N in the east. The dire-ction is indicated by "tow-ards east," while the force is indicated by "10." Magnitude can be thought of as simply the "value" or "amo-unt" of any num-eric value.
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