Answer:
B. The surface of the Earth heats the air that contacts it.
Explanation:
Conduction is a mode of heat transfer in which energy is transferred from a hot molecule to the neighboring molecules due to contact. Thus, heat energy is transferred from one molecule to another in the process.
Therefore, the air that comes in contact with the surface of the earth heats up by conduction. Since the surface of the earth is heated up due to the radiation from the Sun.
Answer: B.
Explanation: I took the test. Also, after my diagnostic I just wanted to see if my answers were correct lol.
Kiana is wearing a black shirt and shiny necklace. While she is outside at recess her shirt absorbs the light waves and gets very hot in the sun, but her necklace reflects the light waves and small circles of light are seen around the yard. What explains why the light waves behaved differently on her shirt than they did on her necklace?
Answer:
Black bodies are good absorber of light waves from the sun, while shining surfaces are good reflector of the light waves.
Explanation:
Generally, a black surface or material tends to absorb light waves while under the sun, while a shiny surface is a good reflector of the waves. This is because the black material is a good absorber, and also a good emitter.
The shiny necklace can only absorb little light waves from the sun, thus it reflects most of the light waves. The reflection is the reason for the small circles of light seen around the yard.
However, when in a cool environment the black shirt would cools faster (good emitter) than the shiny necklace.
Which two factors affect the amount of thermal energy an object has?
PLS HELP ILL GIVE BRAILIEST + 20 PTS
What is the displacement of a car which travels at a steady velocity of
60 km/h
(a) for 3 h
(b) for 1/2 h?
Answer:
(a) 180 km
(b) 30km
Explanation:
To find displacement (in this case, kilometers) you need to convert km/h to km, this can be done by multiplying by the amount of hours:
[tex]\frac{60km}{h}*3h=60km*3=180km \\\frac{60km}{h} *h/2 = 60km/2=30km[/tex]
(The h/2 term came from 1/2*h, since half an hour is h*1/2)
Need help quick!!!!
When trying make an object accelerate, what kind of Net force is required?
A. Balanced Force
B. Unbalanced Force
C. Force of Friction
D. Normal Force
a plane flew for 2 hours at 467 mph
Answer: Plane flew 3,614 miles
Explanation: = (2 × 467) + (5 × 536)=3, 614 miles.
Hope this helps!!! Brainlist? plz
Why are some objects transparent
Because .......
Some light passes through them
All light passes through them
No light passes through them
Which one is correct ?Pls help thank you
Answer:
All light pass through them
Explanation:
hope it helps u :) hv a great day
According to Newton’s first law of motion, which of the following objects will change its motion?
A.A train pulling on another train, each with the same amount of force.
B.A bike rider on a smooth and level road, pedaling at a constant rate.
C.A chair sitting on the floor with balanced forces acting in opposite directions.
D.A ball rolling across the floor with friction acting in the opposite direction.
A ball rolling across the floor with friction acting in the opposite direction.
Answer:
D.
Explanation:
the friction will cause the ball to stop moving which is a change
What is the SI unit for capacitance?
O farad (F)
O volt (V)
O joule (J)
O ampere (A)
The capacitance value of a capacitor is measured in farads (F)
The SI unit for capacitance is referred to as Farads.
What is Capacitance?This is the ability of a device or circuit to store energy which is usually in
the form of electric charges.
A capacitor on the other hand is the device which performs this function.
The formula for determining capacitance is denoted below:
C = q/V where C is capacitance, q is charges and V is voltage.
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What does a step down transformer change in an alternating current
The step down transformer decrease the incoming current's voltage.
Transformers go with the principle of mutual inductance . A changing magnetic field in one circle of wire actuates an electromotive force (EMF) in an adjoining circle of wire, inductively coupled to the primary. In exceptionally fundamental terms, a transformer comprises two coils of wire with tall shared inductance. These coils are electrically isolated whereas they share a common magnetic circuit. In a step-down transformer, there is a decrease in the incoming current’s voltage, where the primary voltage is the incoming voltage whereas the outgoing voltage is considered the secondary. the second coil has fewer windings than the primary, permitting a decrease in voltage within the exiting electrical stream. The primary winding, which is the primary set of coils, interfaces to an alternating-current voltage source, or primary voltage influx. The secondary coil interfaces to the stack, or secondary voltage outpouring, conveying the electrical control absent from the transformer. The substituting current streaming in at the primary voltage makes a substituting magnetic flux. This actuates a similar current within the secondary coil, making a secondary voltage. Here, the diminished number of windings within the secondary coil successfully diminishes the resultant voltage, subsequently “stepping down” the voltage to a lower value whereas keeping up a steady frequency.
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If car is going at a speed of 80 km/h how far will it travel in two hours
Answer: 160 km
Explanation:
"El sujeto es emergente de la compleja trama de relaciones vinculares e institucionales que lo determinan. En esa trama, las relaciones tempranas adquieren un lugar fundamental en los procesos de constitución subjetiva" Terigi, Flavia (2010) Sujetos de la Educación. Para el psicoanálisis, ¿cuáles serían esas relaciones tempranas y por qué se afirma que son fundamentales en los procesos de constitución subjetiva?
La respuesta correcta para esta pregunta abierta es la siguiente.
Para el psicoanálisis, las relaciones tempranas son las relaciones a posteriori entre los padres del recién nacido y el bebé mismo. Estas relaciones son fundamentales en los procesos de constitución subjetiva para el discurso parental para entender los aspectos del desarrollo infantil y sus diferentes estados o teorías de desarrollo para ir comprendiendo cada aspecto de la interrelación y el comportamiento entre las partes.
Para el psicoanálisis, el recién nacido está llegando a un núcleo familiar que ya está establecido y se basa en conocimientos, tradiciones y experiencias de los padres que han recibido de generaciones anteriores, y éstas van a influir directamente en la interrelación permanente con los primeros años del crecimiento del bebé.
A uniformly charged, straight filament 7.00m in length has a total positive charge of 2.00μC. An uncharged card-board cylinder 2.00cm in length and 10.0cm in radius surrounds the filament at its center, with the filament as the axis of the cylinder. Using reasonable approximations, find (a) the electric field at the surface of the cylinder
The electric field at the surface of the cylinder is 51428V/m
Given data:
• The length of the charge is l= 7m.
• The charge is q = 2μC..
• The radius the cylinder is r = 10 cm
Since the filament length is so large as compared to the cylinder length that the infinite line of charge can be assumed.
The expression to calculate the electric field is given as,
E=2kλ/r
Here, λ is the linear charge density.
Substitute the values in the above equation,
E = (2×9×109N⋅m^2/C^2×2×10^−6C)/0.1m×7m
E = 51428N/C×(V/m)/(N/C)
=51428V/m
An electric charge is the property of matter where it has more or fewer electrons than protons in its atoms. Electrons carry a negative charge and protons carry a positive charge. Matter is positively charged if it contains more protons than electrons, and negatively charged if it contains more electrons than protons.
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How can you determine the qualitative relationship that may exist in a set of
data?
WILL MARK BRAINLEST
Answer:
Qualitative research can identify key variables in which regards as findings. Such findings may put into a conceptual framework or a research framework, later stage, that research framework can be tested via various statistical methods such as correlation, structural equation modelling ect. Because, qualitative research do not prove any significant relationship among variables, but quantitative research do. However, based on data gathered in qualitative research, the researcher can show that there may have some relationships among variables through graphically or by using NVivo qualitative data analysis software.
Explanation:
creds to Roshan Panditharathna
You can determine the qualitative relationship that may exist in data because qualitative describes key qualities and characteristics using questionnaires, observation or interviews. On the other hand quantitative relationships are based off of numbers and are collected using graphs and charts.
a vertical spring oscillates with a frequency of 3.0 hz when a 0.60 kg mass is hung from it. determine the frequency when only a 0.38 kg mass hangs from it.
By angular speed, the frequency is 2.39 Hz.
We need to know about the angular speed of harmonic oscillation. the angular speed can be determined as
ω² = k / m
where ω is angular speed, k is spring constant, and m is the mass.
The angular speed can be calculated by
ω = 2πf
Hence,
ω² = k / m
(2πf)² = k / m
k = (2πf)² / m
where f is frequency.
From the question above, we know that:
m1 = 0.6 kg
f1 = 3 Hz
m2 = 0.38 kg
The spring is same, hence the spring constant is the same
k1 = k2
(2πf1)² / m1 = (2πf2)² / m2
f1² / m1 = f2² / m2
3² / 0.6 = f2² / 0.38
f2² = 5.7
f2 = 2.39 Hz
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PLEASE HELP ME
Imagine a metal cooking pan with a wooden handle is placed into a 200 °c oven.
Which material (wood or metal) would reach thermal equilibrium most rapidly? Why?
Answer:
The pan because it is directly on there to absorb heat while the handle is there more towards the end and will have heat reaching the start of the handle while the metal is already hot
Plz answer all 5 of the questions i will give brainlyest
1.What is force?
2.Relate force and motion.
3.What forces control the motion of everyday objects?
4.Identify and define the SI unit for force.
5.Draw a diagram to represent a foot kicking a resting soccer ball. Use arrows to represent the force applied to the ball and to show how the ball moves after it is kicked.
Answer:
1)force:- force is an external affert by any body on an object.
2) force and motion are related to each other. force helps to create motion in any object.
3) frictional force
4) Newton
What is the acceleration of a 7 kg mass pushed by a 3.5 N force?
Answer:
According to Newton's second law of motion, the acceleration of an object equals the net force acting on it divided by its mass, or a = F m . This equation for acceleration can be used to calculate the acceleration of an object when its mass and the net force acting on it are known
Explanation:
A) a 70 kg runner begins his slide into third base moving at a speed of 4 m/s. How much work does friction do to slow him down as he slides into third base?
B) If the runner slides for 2 m, what is the force of friction between the player and the ground?
Answer: I don’t know the answer to this but just do what i do look up the question I’m sure someone has answered this hope it helps❤️
Explanation:
if you know how to SHiFT in sleep how do you do it
How can someone, like myself, share roughly 50% of their DNA with a 1st Cousin?
Your answer:
Answer:
that's your 1st cousin which is your mom or dad's sibling's child sooo when you're that close and that related i would say that that would be the reason why.
Explanation:
hoped that helped!!
What is the mass in grams of 0.48 mol of platinum,Pt.?
93.64 grams
Explanation:mass of platinum =number of moles x molar mass molar mass = atomic mass of any element ,0.48 ×195.084 = 93.64 grams
Differentiate between
joule and watt
Science: Please help me with this due in 5 minutes
Answer: Use less water
only turn on lights when needed
electrical cars
less gas usage
Explanation:
What is the main difference between primary and secondary succession?
A The climax of primary succession is pine forest
B Primary succession begins with bare rocks
C Secondary succession begins with mossed and lichens
D Secondary succession include frequent fires
Answer:
b
Explanation:
What is the weight of a person who has a mass of 60 kg
Answer:
Depends on the grativy of the planet. On Earth is 600 Newtons
Explanation:
W = M . G
W = 60 . 10
W = 600
Solenoid A has length L and N turns, solenoid B has length 2 L and N turns, and solenoid C has length L / 2 and 2 N turns. If each solenoid carries the same current, rank the magnitudes of the magnetic fields in the centers of the solenoids from largest to smallest.
Rank of the magnitude of the magnetic fields in the centers of the solenoid from largest to smallest is,
[tex]B_{C}\; > B_{A}\; > B_{B}[/tex]
We know that, Magnetic field is directly proportional to Turns (N) and inversely proportional to Length (L) of the solenoid.
[tex]B \propto\frac{N}{L}\;\;\;\;\;------ equation(1)[/tex]
For Solenoid A,
[tex]Length\;(L) = L[/tex]
[tex]Turns\;(N)=N[/tex]
Substitute the value of turns and length in equation(1),
[tex]B_{A} =\frac{N}{L}[/tex]
For Solenoid B,
[tex]Length\;(L) = 2\;L[/tex]
[tex]Turns\;(N)=N[/tex]
Substitute the value of turns and length in equation(1),
[tex]B_{B} =\frac{N}{2L}[/tex]
[tex]B_{A} =\frac{1}{2}\;\frac{N}{L}[/tex]
For Solenoid C,
[tex]Length\;(L) = \frac{L}{2}[/tex]
[tex]Turns\;(N)=2N[/tex]
Substitute the value of turns and length in equation(1),
[tex]B_{C} =\frac{2N}{\frac{L}{2} }[/tex]
[tex]B_{C} =\frac{4N}{L}[/tex]
Describe the magnetic field?The magnetic influence on moving electric charges, electric currents and magnetic materials is described by a magnetic field, which is a vector field. A force perpendicular to the charge's own velocity and the magnetic field acts on it when the charge is travelling through a magnetic field. The magnetic field of a permanent magnet pulls on ferromagnetic substances like iron and attracts or repels other magnets. A magnetic field that varies with location will also exert a force on a variety of non-magnetic materials by changing the velocity of those particles' outer electrons.
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can any one give me a amazon code i will repay you. plz i am trying to buy my mom somin off amazon
Answer:i have none but good luck also this is a learning site ;-;
Explanation:
the magnitudes of 2 vectors a and b are 12 units and 8 units respectively. what are the largest and smallest possible values for the magnitude of the resultant vector r
When vector A is oriented in the same direction as vector B, the resultant's greatest magnitude is A + B = 12 + 8 = 20 units. When vector A is oriented in the direction opposite to vector B, the resultant vector has its least magnitude, A - B = 12 - 8 = 4 units.
What is a resultant vector?A vector that produces the aggregate impact of all other vectors is known as a resultant vector. The resultant vector is what we get when we combine two or more vectors. The head-to-tail convention, which is defined as "joining the tail of the first vector with the head of the second vector to give another vector whose head is joined with the head of the second vector and tail of the first vector," can be used to geometrically add vectors by drawing them on a common scale.
Any number of vectors can be added by extending the procedures for obtaining a vector's resultant or adding more than two vectors.
R=A+B+C---
Assume there are three vectors: A, B, and C. These vectors must be drawn in accordance with the head-to-tail rule so that the heads of each vector line up. As a result, the resultant vector is as follows:
R=A+B+C
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Why should you care
about air masses?
Explanation:
because
1.Extremely warm masses can lead to heat waves
2.Extremely cold air masses can be just as deadly and costly
3.The"clashing "of different air masses can produce regions of severe weather
Using the "Rube Goldberg" machine image below, identify the correct simple machine used in this complex machine.
Answer:
c is the correct answer
Explanation:
A Rube Goldberg Machine is “a comically involved, complicated invention, laboriously contrived to preform a simple operation.” 2. What are the 6 Simple Machines? A. The 6 Simple Machines are: wedge, screw, lever, wheel and axel, inclined plane and pulley
Answer: it’s actually A
Explanation:
Anything sharp like a knife, is a wedge so the hook thingy is a wedge