Answer:
Peer Review
Explanation: I took the test
a) Show that the surface temperature of a star can be inferred from measurements of blackbodyfluxes at two different frequencies, even if the stellar radius and distance are unknown.
b) Explain why in practice this method does not work well if both frequencies are on theRayleigh-Jeans side of the spectrum,hνkT.
c) Derive a simple, approximate expression for the temperature when both measurements areon the Wien tail,hνkT.
d) Derive an expression for the star’s radius if a distance measurement is also available (e.g.,from parallax).
Answer:
The answers to the questions have been solved in the attachment.
Explanation:
The answers to part a to e are all contained in the attachment. For answer part b, temperature and frequency were assumed to be fixed or constant. V² is directly proportional to T telling us that variation in T gives us a square in the frequency variation. This tells us why it is difficult when both frequencies are on this side of the black body.
Using a streak test on a mineral that is harder than 7 on Mohs scale would not be very useful True or False
Fracture is the way minerals break along smooth planes of weakness. True or False
Cleavage is the way minerals break with uneven, jagged or rough surfaces True or False
The way light reflects off a mineral is called transparency. True or False
Minerals are the building blocks of rocks. True or False
Mohs scale measures a mineral’s streak. True or False
Color is the most reliable test for identifying a mineral. True or False
Answer: True true false true
Explanation:
How does increasing the amount of charge on an object affect the electric force it exerts on another charged
object?
The electric force increases because the amount of charge has an indirect relationship to the force.
The electric force increases because the amount of charge has a direct relationship to the force.
The electric force decreases because the amount of charge has an indirect relationship to the force.
The electric force decreases because the amount of charge has a direct relationship to the force.
Answer:
the electric force increases because the amount of charge has a direct relationship to the force
Increasing the amount of charge on an object will increase the electric force it exerts on another charged object because the amount of charge has a direct relationship to the force. Therefore, option (B) is correct.
How to calculate the charge on an object?Mathematically, the amount of charge on an object due to the effect of the force that is exerted on it can be calculated by using the formula mentioned below:
F = E×q
Where F is the electric force, E is the energy, and q is the charge.
The electric force between charged particles at rest is known as electrostatic force. The magnitude of the electric force between point charges is directly proportional to the multiplication of the charges and inversely proportional to the distance between them.
Therefore, increasing the amount of charge on an object would increase the electric force because the amount of charge has a direct relationship with the force.
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Which formations are created by wave erosion?
a) Barrier beaches
b) Sandbars
c) Spits
d) Stacks
Answer:d) Stacks
Explanation: A stack or sea stack is a geological landform consisting of a steep and often vertical column or columns of rock in the sea near a coast, formed by wave erosion. Stacks are formed over time by wind and water, processes of coastal geomorphology.
Please Help:)
How to draw two vectors being added:
Explanation:
you add the from head to tail. Head is the triangle and tail is the final point of the vector
Two cars approach one another on opposing lanes of a highway. Car 1 is traveling north at a velocity of 80 km/h and car 2 is traveling south at a velocity of 140 km/h. What is the magnitude of the velocity of car 1 relative to car 2?
Answer:
220 km/hr
Explanation:
How does the amount of work done on an object to make it move in the horizontal direction compare to the amount of kinetic energy gained by the object
Answer:
when compared, they are equal
Explanation:
the quantity of work done on object to get it to move in the horizontal direction as well as amount of kinetic energy gained by this object have a direct relationship.
this is true because we are going by the work-energy theory.
"the net work done on any object is equal to the change in the kinetic energy of that object".
therefore amount of kinetic energy gained = work done to make it go in an horizontal direction.
Jafar's pretty practical, and the physics teacher seems to talk a lot about unreal things such as frictionless surfaces, point particles that represent whole objects (like his car), and ropes that do not stretch when they are used. Scott, one of Jafar's classmates, says that there's the world and then there's physics class and it's not real; Jafar should just memorize the unreal things, give the teacher what she wants, and forget them after the final examination, but Jafar is not comfortable with that. He wants to be an engineer like his older sister, and she told him that what they learned in physics does relate to her job. So giving the teacher what she wants and forgetting does not seem like a good option to him. Which, if any, of the following possible statements Jafar makes to Scott in response to his suggestion could be correct and may be able to persuade Scott to change his mind?
A. "Physics uses unreal situations as starting points because they are easy to visualize and do calculations with, then it adds reality little by little on to the simplified foundations; so points that represent objects aren't lies, they are just simplifications that give us a foothold onto the ideas that are important to consider."
B. "Physics gave the world the transistor and other devices that work in the computers in my car. Physicists have been able to land objects from Earth on Mars and have invented lasers and holograms. Something they are doing as scientists leads to these results, so we should both work to really understand how physics works."
C. "Engineers who built bathyscaphes to investigate the ocean depths use physics principles to keep occupants alive. Engineers who build bridges use physics so the cars do not plunge through even in heavy traffic. Engineers can create integrated circuits that do huge numbers of calculations each second. I think it must be important to understand how the basic physics leads to these useful results."
D. "My sister is an engineer, and she says learning physics is important. If she says so, we should learn O it."
Answer:
Statements A,B,C are correct
Explanation:
For the first statement Jafar is trying to explain the reasons behind the use of unreal/ideal situations by the physics teacher while teaching in classrooms and that can make Scott change his mind about physics
The second statement shows the real applications of physics in every day Devices like the transistor and other devices seen in the world today
The third statement shows to Scott the application of physics in ensuring the safety of lives and property of people around the world
while statement D is not a correct statement to persuade Scott
Answer:
yes A,B,C
Explanation:
my plan for increasing my participation includes the following strategies
Answer:
Find the explanation below.
Explanation:
I agree to increase my participation in active recreational activities particularly jumping and running for 5 days per week. I will begin my program next month and plan to reach my final goal by entering SPORTS.
My plan for increasing my participation includes the following strategies
1. I must have a positive mind and participate in activities so I can get good grades.
2. I would prepare a schedule for my activities so that they do not encroach on the time for sports.
3. I must dedicate hours to practice the skills that I am not very good at
4. I must listen attentively to the instructions from my coach and apply them diligently.
5. I must develop the spirit of sportsmanship with my peers and playmates so that I can learn from their skills.
My plan for increasing my participation include:
Listen carefully.Foster friendships.Engage the help of volunteers.Promote exercise.Initiate regular meetings for special interest groups.In order to increase participation in activities, it's important to be patient and take time to listen. There should be undivided attention.
Encourage friendships by identifying the residents that have identical character traits and personalities. One can also initiate a volunteers program. They can assist by supervising groups and leading discussion groups.
There should be a promotion of exercise. Residents should be aware of the benefits of exercise for their minds and body. There should also be regular meetings for special interest groups.
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How far has a object fallen that is traveling 98 m/s In 10 seconds
Answer:
The distance is, y = 489.5 [m/s]
Explanation:
To solve this problem we can use the following equation of kinematics.
[tex]v_{f}^{2}= v_{i}^{2}+(2*g*y)[/tex]
where:
Vf = final velocity = 98 [m/s]
Vi = initial velocity = 0
g = gravity acceleration = 9.81 [m/s^2]
y = distance [m]
(98^2) = 0 + (2*9.81*y)
Note: the positive sign of the equation means that the acceleration of gravity acts in the direction of the movement of the object.
9604 = 19.62*y
y = 489.5 [m/s]
Please help science question
Answer:
it is moving left
Explanation:
A square boat with a mass of 544 g is placed in a tank of corn syrup. The corn syrup has a density of 1.36 g/mL. The boat has a base that measures 8 cm by 8 cm. How far will the boat sink into the corn syrup?
A. 4.17 cm
B. 6.25 cm
C. 8.50 cm
D. 11.56 cm
Answer:
B
Explanation:
A beam of charged particles moving with a speed of 106 m/s enters a uniform magnetic field of 0.1 T at right angles to the direction of motion. If the particles move in a radius of 0.2 m, then calculate their period of motion.
Answer:
The period of motion is 1.26x10⁻⁶ s.
Explanation:
The period of motion can be found as follows:
[tex] \omega = \frac{2 \pi}{T} [/tex]
Where:
ω is the angular speed
T is the period
The angular speed is related to tangential speed (v):
[tex] v = \omega r [/tex]
r is the radius
Hence, the period is:
[tex] T = \frac{2 \pi r}{v} = \frac{2 \pi 0.2 m}{10^{6} m/s} = 1.26 \cdot 10^{-6} s [/tex]
Therefore, the period of motion is 1.26x10⁻⁶ s.
I hope it helps you!
A force of 20 N is inclined at 30 degrees to the X axis. What are X and Y components of the force?
Answer: 10 root 3 N, 10N
Explanation:
Running late to work, Mr. Linares drops his keys from the top of the second floor stairwell and they fall straight down to the ground level. It takes about 1.8 s for the keys to hit the floor. How high did the keys fall from?
Answer:
about 1.8 s high
Explanation:
A box of oranges with a weight of 96 N is being pushed across a horizontal floor. As it moves, it is slowing at a constant rate of 0.90 m/s each second. The push force has a horizontal component of 20 N and a vertical component of 25 N downward.
Required:
Calculate the coefficient of kinetic friction between the box and floor.
Answer:
μk=0.24Explanation:
Please see attached a detailed drawing of the force and line diagram for your reference.
Given data
weight W=96N
Fx=20N
Fy=25N
acceleration a= -0.9m/s^2----slowing down indicate negative
W=mg= 96N
Fk= kinetic friction= μkN
where N= normal reaction
from newtons second law
F=ma
x-----Fx-Fk=ma
Fk=Fx-ma
y----N-Fy-W=0
N=25+96
N=121N
so
Fx-μkN=ma
20-μkN=(96/9.81)-0.9
20-μkN=-86.4/9.81
20-μkN=-8.80
-μkN=-20-8.8
μkN=20+8.8
μk=28.8/N
μk=28.8/121
μk=0.238
μk=0.24
Vectors A and B lie in the xy ‑plane. Vector A has a magnitude of 17.1 and is at an angle of 150.5∘ counterclockwise from the +x ‑axis. Vector B has a magnitude of 28.1 and is 205.3∘ from the +x ‑axis. Resolve A and B into components, and express using ???????????? unit vectors,
A =Ax????+Ay????+Az????
B =Bx????+By????+Bz????
where Ax, Ay, Az and Bx, By, and Bz are the calculated values of the x ‑, y ‑, and z ‑components of vectors A and B , respectively.
Answer:
A = -14.87 i ^ + 8.42 j ^ + 0 k ^
B = -25.41 i ^ -12.0 j ^ + 0 k ^
Explanation:
For this exercise let's use trigonometry by decomposing to vectors
vector A
module 17.1 with an angle of 150.5 counterclockwise.
Sin 150.5 = [tex]A_{y}[/tex] / A
cos 150.5 = Ax / A
A_{y} = A sin 150.5 = 17.1 sin 150.5
Aₓ = A cos 1505 = 172 cos 150.5
A_{y} = 8,420
Aₓ = -14.870
the vector is
A = -14.87 i ^ + 8.42 j ^ + 0 k ^
Vector B
[tex]B_{y}[/tex] = 28.1 sin 205.3
Bₓ = 28.1 cos 205.3
B_{y} = -12.009
Bₓ = -25.405
the vector is
B = -25.41 i ^ -12.0 j ^ + 0 k ^
A person in a lab wants to make a car accelerate faster. Should the person:
O decrease the mass
o increase the mass
O lower the force
Answer:
Decrease the mass.
Explanation:
By Newton's Second Law we know that net force exerted on a given system equals the rate of change of linear momentum ([tex]P[/tex]) in time.
[tex]F = \frac{dP}{dt}[/tex] (Eq. 1)
When mass of the system has a constant mass, this net force ([tex]F[/tex]) is reduced to its mass ([tex]m[/tex]) multiplied by acceleration ([tex]a[/tex]):
[tex]F = m\cdot a[/tex] (Eq. 2)
If we keep net force exerted on system constant, then a decrease on mass is compensated by an increase in acceleration. Hence, correct answer is: Decrease the mass.
Describe how an electric bell works
Answer: Google: An electric bell is a mechanical or electronic bell that functions by means of an electromagnet. ... When an electric current flows through the coils, the electromagnet creates a magnetic field which pulls the armature towards it, causing the hammer to strike the bell.
In my words: An electric bell works with a function of electromagnet. When the electric current flows into the coils, the electromagnet makes a magnetic field that brings the aemature towards the magnentic feild. When this happend this cause the hammer to hit the bell. And this is how an electric bell works.
Explanation:
Answer:
"An electric bell is a mechanical or electronic bell that functions by means of an electromagnet. ... When an electric current flows through the coils, the electromagnet creates a magnetic field which pulls the armature towards it, causing the hammer to strike the bell."
Which refers to the density of the medium’s particles at the compression of a sound wave?
amplitude
pitch
volume
wavelength
Answer:
The answer is A
Answer:
A. amplitude
Explanation:
{Earth science} I give brainly!*
Please select the word from the list that best fits the definition
used as evidence for sea-floor spreading
Options~
Magma
Seismograph
Global positioning system
Fossils
Rift zones
Magnetic reversal'
*I only give brainly if you are right lol
Answer:
The answer is magma
Explanation:
I'm 99.99% this is right
Answer: its magnetic reversal
Explanation: jus took the test make brainly
1. A rock is falling downwards at 12.0 m/s. After 2.0 seconds it is falling at downwards at
31.6 m/s. What was its acceleration?
Answer:
a = 9.8 m/s²
Explanation:
Here, we will use the first equation of motion to determine the acceleration of the falling rock. The first equation of motion is written as follows:
Vf = Vi + at
where,
Vf = Final Velocity of the falling rock = 31.6 m/s
Vi = Initial Velocity of the falling rock = 12 m/s
a = acceleration = ?
t = time interval = 2 s
Therefore,
31.6 m/s = 12 m/s + a(2 s)
a = (31.6 m/s - 12 m/s)/(2 s)
a = 9.8 m/s²
Given:
Final velocity, [tex]V_f = 31.6 \ m/s[/tex]Initial velocity, [tex]V_i = 12 \ m/s[/tex]Time, [tex]t = 2 \ seconds[/tex]We know the relation,
→ [tex]V_f = V_i +at[/tex]
By substituting the values,
[tex]31.6 = 12+a(2)[/tex]
[tex]a = \frac{31.6-12}{2}[/tex]
[tex]= \frac{19.6}{2}[/tex]
[tex]= 9.8 \ m/s^2[/tex]
Thus the answer above is correct.
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When practicing reading skills, you should focus on _______.
content recall
comprehension
speed
all of the above
Answer:
I would say the answer is All the above.
Explanation:
If this wasn't what you were looking for please don't hesitate to comment again! Have a nice day/night! :)
Answer:
all the above
Explanation:
A force that tends to pull an object towards the center of the earth is?
Explanation:
Gravitational force
A jumper in the long-jump goes into the jump with a speed of 12 m/s at an angle of 20 degree above the horizontal. How long will it take the jumper to reach the highest point
Answer:
ffffffffffffffffffffffffffffffffffffffff
Explanation:
The jumper will take 0.419 seconds to reach the highest point.
What is Projectile Motion?A projectile can be described as an object that is thrown obliquely near the surface, it moves along a curved path with constant acceleration directed toward the center of the earth.
In a Projectile Motion, along the x-axis, there is uniform velocity, responsible for the horizontal motion, and along the y-axis, there is uniform acceleration, responsible for the vertical motion of the particle.
The time required to attain the maximum height of the jumper will be given by:
[tex]t =\frac{usin\theta}{g}[/tex]
Given, the velocity of the jumper, u = 12 m/s
The angle of the jumper with the horizontal, θ = 20°
The time taken by the jumper to achieve maximum height:
[tex]t = \frac{12\times sin 20}{9.8}[/tex]
t = 0.419 sec
Therefore, the jumper will achieve maximum height in 0.419 seconds.
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Kristine wants to maesure the mass and volume of the key which tools should she use
You are playing right field for the baseball team. Your team is up by one run in the botton of the last inning of the game when a ground ball slips through the infield and comes straight toward you. As you pick up the ball 65m from home plate, you see a runner rounding third base and heading for home with the tying run. ou throw the ball at an angle of 30 degrees above the horizontal with just the right speed so that the ball is caught by the catcher, standing on home plate, at the same height as you threw it. As you release the ball, the runner is 20 meters from home plate and running full speed at 8.0 m/s. Will the ball arrive in time for your team's catcher?
Answer:
The correct response is "No". The further explanation is given below.
Explanation:
The given values are:
Angle
[tex]\theta = 30^{\circ}[/tex]
Distance
d = 20 m
Speed
s = 8.0 m/s
Now,
⇒ [tex]y(t) = \frac{1}{2}\times a\times t^2 + v0\times t\times (sin \theta)[/tex]
[tex]0 = -4.9t^2 + v0\times t\times (sin 30)[/tex]
[tex]x = v0\times (cos \theta)\times t[/tex]
[tex]65 = v0\times (cos 30)\times t[/tex]
[tex]v0\times t = \frac{65}{Cos30}[/tex]
[tex]0 = -4.9t^2 + 65\times \frac{sin30}{cos30}[/tex]
[tex]t = 2.767 \ sec[/tex]
So,
⇒ [tex]d = r\times t[/tex]
[tex]20 = 8\times t[/tex]
[tex]t=2.5 \ sec[/tex]
Therefore, 2.5 < 2.767, so it won't get there.
Select the only incorrect statement from the following:
a. When resistors are connected in parallel, the voltage across each resistor is the same
b. When resistors are connected in series, the potential difference across each resistor is the same
c. When resistors are connected in parallel, the total current from the voltage source is the sum of the currents in the individual resistors
d. The current flowing in all resistors in series across a battery is the same as the current from the battery
e. The voltage across all the resistors in series is the sum of the individual voltages across each resistor
Answer: b. When resistors are connected in series, the potential difference across each resistor is the same.
Explanation: When resistors are in series, current is the same in all of rhe them. According to the First Law of Ohm,
voltage (potential difference) = resistance * current.
Resistance is the proportionality constant between voltage and current.
If current is the same, to "keep" resistance constant, voltage has to vary.
So, when resistors are in series, current is the same and potential difference or voltage varies.
State the following forms of electromagnetic radiation in increasing order of wavelength.
Radiowaves, gamma rays, x-rays, infrared radiation, visible light
Answer:
Gamma rays, x-rays, visible light, infrared radiation and radiowaves
Explanation:
Gamma rays, x-rays, ultraviolet, visible light, infrared radiation, microwave and radiowaves
An object has a mass of 4kg. What is its weight (in Newton) on Earth?
Answer:
mass of an object = 4kg
acceleration due to gravity on earth = 9.8 m/s²
therefore , weight of an object on earth = Mass × gravity
=> weight = 4×9.8 => 39.2 N
since , weight is a force we measure it in newtons