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.
If an airplane accelerates at a constant rate of 3.0 m/s^2 starting with a velocity of 21 m/s, then what will its displacement be after 40s?
The displacement at a constant acceleration of 3.0[tex]m/s^{2}[/tex] is 526.5m.
Distance, which is a scalar quantity, describes "how much ground an object has covered" while moving. The term "how far out of place an object is" relates to displacement, a vector number that describes the total change in position of the object.
For constant acceleration, displacement is:
[tex]d = (\frac{1}{2} ) (\frac{v_{f}^{2} - v_{i} ^{2} }{a} )[/tex]
[tex]d = \frac{60^{2}-21^{2} }{2*3}[/tex]
[tex]d = \frac{3600-441}{6}[/tex]
[tex]d = \frac{3159}{6}[/tex]
d = 526.5m
Therefore, the displacement at a constant acceleration of 3.0[tex]m/s^{2}[/tex] is 526.5m.
The complete question is: An airplane accelerates with a constant rate of 3.0m/s^2 starting at a velocity of 21m/s. If the final velocity is 60m/s what is the displacement during this period?
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what is nuclear energy
Answer:
Nuclear energy, also called atomic energy, energy that is released in significant amounts in processes that affect atomic nuclei, the dense cores of atoms. It is distinct from the energy of other atomic phenomena such as ordinary chemical reactions, which involve only the orbital electrons of atoms.
Explanation:
Answer: Nuclear energy, also called atomic energy, energy that is released in significant amounts in processes that affect atomic nuclei, the dense cores of atoms. It is distinct from the energy of other atomic phenomena such as ordinary chemical reactions, which involve only the orbital electrons of atoms.
Explanation: please give brainliest and thanks :)
a ball is thrown upward at 25 m/s from the ground. what is the balls velocity after 4 seconds?
Answer:
-14.2m/s
Explanation:
Given parameters:
Initial velocity of the ball = 25m/s
Time = 4s
Unknown:
Final velocity of the ball = ?
Solution:
To solve this problem, we use the expression below;
v = u - gt
v is the final velocity
u is the initial velocity
g is the acceleration due to gravity
t is the time
v = 25 - (9.8 x 4) = -14.2m/s
I need help on this the first one is plant cell
Answer:
The Vacuole
Explanation:
The Vacuole
(b) What If? A particle with charge q is located a very small distance from the center of a very large square on the line perpendicular to the square and going through its center. Determine the approximate electric flux through the square due to the charged particle.
A particle with charge q is a very small distance from the centre of a very large square on the line perpendicular to the square and going through its centre.
Since the distance between the charge and the centre of the square is very small, the square contains the field lines emerging from the charge.
[tex]\Phi_{E,square} = \frac{q}{2_{\in_{0} } }[/tex]
A particle is a small localized object which can be ascribed to several physical or chemical properties, such as volume, density, or mass.[1][2] They vary greatly in size or quantity, from subatomic particles like the electron to microscopic particles like atoms and molecules, to macroscopic particles like powders and other granular materials. Particles can also be used to create scientific models of even larger objects depending on their density, such as humans moving in a crowd or celestial bodies in motion.
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are there any obvious differences between the beam observations and the cylinder observations? (select all that apply.) the maximum value of the cylinder observations is higher. the observations for beams are more variable, or spread out. the maximum value of the beams observations is higher. the observations for cylinders are more variable, or spread out.
The obvious differences between the beam observations and cylinder observations are that the maximum value of the cylinder observations is higher and the observations for cylinders are more variable or spread out.
In the above case, the material strength observations in Mega Pascals for cylinder and beams are given.
The values for cylinders are as follows
6.1, 5.8, 7.8, 7.1, 7.2, 9.2, 6.6, 8.3, 7.0, 8.3, 7.8, 8.1, 7.4, 8.5, 8.9, 9.8, 9.7 14.1, 12.6 11.2, 8.1, 7.4, 8.5, 8.9, 9.8, 9.7, 14.1, 12.6, 11.2
And the values for beams are
5.9, 7.2, 7.3, 6.3, 8.1, 6.8, 7.0, 7.6, 6.8, 6.5, 7.0, 6.3, 7.9, 9.0, 8.2 , 8.7, 7.8, 9.7, 7.4, 7.7, 9.7,7.8, 7.7, 11.6 11.3 11.8 10.7,8.2, 8.7, 7.8, 9.7, 7.4, 7.7, 9.7, 7.8, 7.7, 11.6, 11.3, 11.8, 10.7
From the above-given values, we can calculate the mean/average value of the observations.
The average value for cylinders comes out to be 8.57.
The average value for beams comes out to be 8.14.
Among the given values, the maximum value is 14.1 for cylinder observations.
The values of beam observations range from 5.9 to 11.8 while the values for cylinder observations range from 5.8 to 14.1. Therefore, the observations for the cylinder are more variable or spread out.
Thus, the maximum value of the cylinder observations is higher and the observations for cylinders are more variable or spread out.
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This question is incomplete. The data used for solving the question is given in the adjoining image.
Cameron flies directly west for 13 km, then turns to the south and flies for another 30 km. He then flies east for 13 km before landing at the airport.
Answer:
Distance = 56km Displacement = 30km
Explanation:
hope I helped
A 8 kg ball is moving with a speed of 10 m/s directly toward a 4 kg ball
which is at rest. The two balls collide and stick together. What is their
velocity immediately after the collision?
Answer:
v₃ = 6.67 [m/s]
Explanation:
To solve this problem we must use the linear momentum conservation theorem, which tells us that momentum is preserved before and after the collision.
Let's take the ball movement of 8 [kg] as positive.
Therefore we can built the following equation:
[tex](m_{1}*v_{1})+(m_{2}*v_{2})=(m_{1}+m_{2})*v_{3}[/tex]
where:
m₁ = mass of the 8 [kg] ball
m₂ = mass of the 4 [kg ] ball
v₁ = velocity of the 8 [kg} ball before the colllision = 10 [m/s]
v₂ = velocity of the 4 [kg] ball before the colllision = 0 [m/s] (at rest)
v₃ = velocity of the two balls after the collision [m/s]
[tex](8*10)+(4*0)=(8+4)*v_{3}\\80 = 12*v_{3}\\v_{3}=6.67 [m/s][/tex]
A cart sitting at the top of a hill has 9000 J of potential energy. The cart is then pushed and by the time it is half way down the hill it has converted half of its potential energy . If the carts weighs 1000 kilograms then how fast is the cart rolling when it is halfway down the hill?
Answer:
Explanation:
H
the following four waves are sent along strings with the same linear densities (x is in meters and t is in seconds). rank the waves according to (a) their wave speed and (b) the tension in the strings along which they travel, greatest first:
(a) If we consider the waves to travel in a straight line (x = 0), according to their wave speed,
Wave A is the slowest wave and it travels at a speed of 0.5 meters per secondWave B is the next slow wave and it travels at a speed of 1 meter per second Wave C is the fastest wave and it travels at a speed of 2 meters per second Wave D is the fourth and final slow wave and it travel at a speed of 1.(b) The waves are ranked according to the tension in the strings along which they travel, with the greatest first,
The waves with the lowest tension (wave A and C) travel along the strings with a lower linear density. Wave B travels along the string with a higher linear density, so it has greater tension. Wave D travels along the string with an even higher linear density, so it has even greater tension.In waves, what does linear density mean?The linear density of the string and the tension in the string both affect the wave's speed. The linear density is the mass divided by the string's length. In general, the square root of the ratio of the medium's elastic to inertial properties determines a wave's speed.
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What would be the resulting condition if Earth's axis was perpendicular to the Sun?
a. The winters would be much colder.
b. There would no longer be seasons.
c. The summers would be much hotter.
d. There would be a reversal of seasons.
There would no longer be seasons if Earth's axis was perpendicular to the Sun because the variation in the seasons happens due to the tilt of the earth which results in unequal distribution of the sunlight on the earth's surface throughout the year.
Therefore the correct answer is option B.
What is the equator?
The Equator is an imaginary line passing through the middle of a globe. It is equidistant from the North Pole and the South Pole, Its is a horizontal line residing at 0 degrees latitude.
As given in the problem we have to find what happens if Earth's axis was perpendicular to the Sun,
If the Earth's axis were perpendicular to the Sun, there wouldn't be any seasons since the tilt of the planet causes an uneven distribution of sunlight on its surface throughout the year, which causes seasonal fluctuation.
Thus, the correct answer is option B.
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sam is an astronomer on planet hua, which orbits the distant star barnard. it has recently been accepted that hua is spherical in shape, although its exact size is unknown. while studying in the library, in the city of joy, sam learns that during equinox, barnard is directly overhead in the city of bar, located 1100.0 km north of his location. on the equinox, sam goes outside and measures the altitude of barnard at 78 degrees. what is the radius of hua in km?
There are 90 degrees directly overhead. Barnard is at 74 degrees at Sam's position, 1300.0 kilometers south. The part of the 360 degree circle that corresponds to Hua's circumference is the difference between 90 and 74, or 16 degrees. 1300.0 km is therefore 16/360 of the circle, or 0.044 times the circumference. 29.250 km is the circumference (1300 divided by 0.044). Radius divided by two gives the circumference equation. Therefore, 2r=29250 and the radius of Hua=4655.3 km
What do you mean by Astronomy?Astronomy is a scientific science that examines celestial objects and phenomena (from the Ancient Greek "o" (astronoma), "science that investigates the laws of the stars"). In order to describe their creation and evolution, it makes use of mathematics, physics, and chemistry. Planets, moons, stars, nebulae, galaxies, and comets are among the interesting celestial bodies. Supernova explosions, gamma ray bursts, quasar, blazar, pulsar, and cosmic microwave background radiation are examples of relevant phenomena. Astronomy is the study of everything that comes from outside the atmosphere of the Earth. Astronomical cosmology is the study of the cosmos as a whole.
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okay please help me I’m timed!
Answer: It is C
Explanation: A disturbance that transfers energy from one place to another, without transferring matter! I just finished that unit! I hope you find this helpful and your welcome!
if the pumpkin is thrown from a height of 14 meters above the ground. the velocity of the pumpkin when it is thrown is 23 m/s at 40 degrees above the horizontal. what is the value of the horizontal velocity when the pumpkin is thrown
Answer:
The value of the horizontal velocity when the pumpkin is thrown is approximately 17.619 m/s
Explanation:
The height from which the pumpkin is thrown = 14 meters
The velocity with which the pumpkin is thrown = 23 m/s
The direction in which the pumpkin is thrown = 40° above the horizontal
The horizontal component of the velocity = 23 × cos(40) ≈ 17.619
Therefore, the value of the horizontal velocity when the pumpkin is thrown ≈ 17.619 m/s
12.
A rock on the surface of Mars is projected vertically upwards with an intial speed of 9.4ms The
rock rises to a height of 12 m above the surface.
Assume there is no atmosphere on Mars
What is the acceleration of free fall near the surface of Mars?
Answer:
3.68 m/s².
Explanation:
From the question given above, the following data were obtained:
Initial velocity (u) = 9.4 ms¯¹
Maximum height (h) reached = 12 m
Final velocity (v) = 0 (at maximum height)
Acceleration of free fall (g) =?
v² = u² – 2gh (since the rock is going against gravity)
0 = 9.4² – 2 × g × 12
0 = 88.36 – 24g
Collect like terms
0 – 88.36 = –24g
–88.36 = –24g
Divide both side by –24
g = –88.36 / –24
g = 3.68 m/s²
Thus, the acceleration of free fall near the surface of Mar is 3.68 m/s².
The acceleration of free fall near the surface of Mars is [tex]3.68 \;\rm m/s^{2}[/tex].
Given data:
The magnitude of initial velocity of rock is, u = 9.4 m/s.
The height raised up by rock is, h = 12 m.
Here, we need to find the acceleration of free fall, which is nothing but the gravitational acceleration. So we will use the Third kinematic equation of motion, which is given as,
[tex]v^{2}=u^{2}+2gh[/tex]
Solving as,
[tex]0^{2}=9.4^{2}+(2 \times -g \times 12)\\\\g = 3.68 \;\rm m/s^{2}[/tex]
Thus, we can conclude that the acceleration of free fall near the surface of Mars is [tex]3.68 \;\rm m/s^{2}[/tex].
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please help me swear will mark brainiest
Answer:
its weight only option a.
The diagram illustrates that temperature is not always increasing. At what points in the graph is there NO temperature change, why?
A. A-B; the energy is being used to melt the solid
B. B-C; the energy is being used to change the state of matter (melting)
C. C-D; the energy is being used to boil the liquid
D. the temperature is increasing throughout the graph
Answer:
A
Explanation:
Hopefully this helps
Answer:
A
Explanation:
Which set of words below make the following statement about energy correct?
"Energy cannot be ________ or ________. Energy ________ from one form to another."
Group of answer choices
increased, decreased, flows
added, removed, moves
created, destroyed, transforms
Answer:
created, destroyed, transforms
Explanation:
Energy cannot be created nor destroyed.
Energy is transformed from one form to another form.
This is the postulate of the law of conservation of energy.Energy is neither created nor destroyed simply implies that energy is not produce in any system. Nor is it destroyed.
What we have is energy transformation from one form to another.
Why do we use the name electromagnetism to describe the force of an
electromagnet SOMEONE PLS ANSWER FAST
Answer:
magnet, gravity
Explanation:
26 POINTS!! will give brailest! can anyone help me? if you can't well, Merry Christmas!
Have an amazing day you are an amazing person:)
what is the benefit of using neutral arguments to express oneself while in a conflict.
Answer:
Neutral arguments avoid using "you" statements and, therefore, can assist in avoiding being perceived as offensive or indicating that you believe your opponent is unreasonable. It is best to use "I" statements rather than "you" statements, because it helps keep the tone of statements neutral, which avoids escalating the conflict.
Explanation:
Answer:
the person above is correct ^^^^^^^^^^^
Explanation:
What is the unit for electrical power?
O volt (V)
O joule (J)
O kilowatt-hour (kWh)
O watt (W)
Answer:
The answer is Watt
Explanation:
Electricity is measured in Watts and kilowatts
Electricity is measured in units of power called Watts, named to honor James Watt, the inventor of the steam engine. A Watt is the unit of electrical power equal to one ampere under the pressure of one volt. One Watt is a small amount of power.
you read in an astronomy book that our milky way galaxy consists of about 200 billion stars. how do you suppose this number was determined?
By utilising a galaxy model that accurately explains all of the data that has been collected thus far.
Is each star in a different galaxy a sun?In other words, while every star is a star, not every star is a Sun. Since the Sun is bigger than most stars, it is also more brighter. In our galaxy alone, there are billions of Suns, and as was already established, many of the stars we can see are Suns. However, a lot of what you see while gazing up into space is not a star.
The sizes of stars range from neutron stars, which can be about 12 miles (20 kilometres) across, to supergiants, which have a diameter that is 1,000 times larger than the sun. The brightness of a star is influenced by its size. Particularly, brightness and radius are related.
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What is the weight of a 225 kg space probe on the moon? The gravitational field on the moon is 1.62 N/kg. Show work.
a. 139 N
b. 364 N
c. 1.35 x 10^3 N
d. 2.21 x 10^3 N
Answer:
b. 364 [N]
Explanation:
We must remember that the gravitational force can be calculated by means of the product of mass by acceleration. In this case, the acceleration corresponds to the gravitational acceleration of the moon.
[tex]F=m*g\\[/tex]
where:
F = force [N]
m = mass = 225 [kg]
g = moon gravity acceleration = 1.62 [m/s²]
[tex]F = 225*1.62\\F = 364.5[N][/tex]
The weight is 364 N
The calculation can be done as follows
mass= 225 kg
gravitational field= 1.62 N/Kg
Formula is
F= mg
= 225 ˣ 1.62
= 364
= 364 N
Hence the weight of the probe on the moon is 364N
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what are three considerations diamond discusses as he ponders yali’s question in guns, germs, and steel
The three considerations diamond discusses as he ponders Yali's question in guns, germs and steel are:
Explaining why Europe has become more advanced than other regions tends to confirm the notion that Europe is betterFraming the question in this way contributes to a Eurocentric view of human developmentThe question assumes that the natural progression of human history is toward "civilization" and that being "civilized" is better than being "primitive."The stage of human social and cultural development and organization that is considered the most advanced is termed as civilization.
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I WILL MARK BRAINLIEST
Answer:
well I mean it would depend on where u live for this question that's the only reason I am confused.. I'm pretty sure it's A thi
Which characteristic of water quality provides the most information regarding the health of a water system? *
A clarity
B temperature
C concentration of heavy metals
D presence of indicator species
DO NOT LEAVE I HV ALOT MORE QUESTIONS!!!
Not really sure what it is
Answer:
water seeping through a pot of soil
Explanation:
All the others permanently change the chemical structure of the element so they are chemical reactions
How many protons and electrons will each of those elements have after forming ions, and how can you tell
The proton number is the atomic number of the element, while the electron number is the atomic number minus the charge. A negatively-charged ion or anion has more electrons than protons. Again, the number of protons is the atomic number. The number of electrons is the atomic number added to the charge.
This hurts. Help me.
Answer:
a. T₂ = 60 N
b. W = 25.98 N
Explanation:
a.
Taking right side as positive x direction, the equation for sum of forces in x-direction can be written as follows:
[tex]T_{2}Sin\ 30^o - T_{1} = 0\\T_{2}Sin\ 30^o = T_{1}\\T_{1} = (T_{2})(Sin\ 30^o)\\where,\\T_{2} = 30\ N\\Therefore,\\T_{1} = (30\ N)(Sin\ 30^o)\\[/tex]
T₁ = 15 N
b.
Taking upward direction as positive y direction, the equation for sum of forces in y-direction can be written as follows:
[tex]T_{2}Cos\ 30^o - W = 0\\T_{2}Cos\ 30^o = W\\W = (30\ N)Cos\ 30^o\\[/tex]
W = 25.98 N