Answer:
Stars are huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores. Aside from our sun, the dots of light we see in the sky are all light-years from Earth.
Explanation:
Stars are the most widely recognized astronomical objects, and represent the most fundamental building blocks of galaxies. The age, distribution, and composition of the stars in a galaxy trace the history, dynamics, and evolution of that galaxy. Moreover, stars are responsible for the manufacture and distribution of heavy elements such as carbon, nitrogen, and oxygen, and their characteristics are intimately tied to the characteristics of the planetary systems that may coalesce about them. Consequently, the study of the birth, life, and death of stars is central to the field of astronomy.
Stars are born within the clouds of dust and scattered throughout most galaxies. A familiar example of such as a dust cloud is the Orion Nebula. Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction. As the cloud collapses, the material at the center begins to heat up. Known as a protostar, it is this hot core at the heart of the collapsing cloud that will one day become a star. Three-dimensional computer models of star formation predict that the spinning clouds of collapsing gas and dust may break up into two or three blobs; this would explain why the majority the stars in the Milky Way are paired or in groups of multiple stars.
Answer:
stars are are giant balls of gases...yes their light is natural, it emits light due to chemical activities in the cor of star. We are living in the milky way and the nearest galaxy to us is Andromeda galaxy which is about 2.5x more larger than our galaxy, no there are no proofs for presence of aliens
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A driver of a car traveling at -15m/s applies the brakes, causing a uniform acceleration of +2.0m/s2. If the brakes are applied for 2.5s, what is the velocity of the car at the end of the braking period? How far has the car moved during the braking period?
Given :
Initial velocity, u = -15 m/s.
Acceleration , a = 2 m/s².
Time taken to applied brake, t = 2.5 s.
To Find :
The velocity of the car at the end of the braking period.
How far has the car moved during the braking period.
Solution :
By equation :
[tex]v = u+at\\\\v=-15 + 2\times 2.5\\\\v=-10 \ m/s[/tex]
Now, distance covered by car is :
[tex]s=ut+\dfrac{at^2}{2}\\\\s=(-15)(2.5)+\dfrac{2(2.5)^2}{2}\\\\s=-31.25\ m[/tex]
Hence, this is the required solution.
What is the magnitude of a rope that is being polled 300n to the left and 425n to the right
Answer:
FT = 125 [N], to the right
Explanation:
Both forces are characterized by being vectors, and these are applied in opposite directions so the difference between them will be the result of the sum of the forces.
FL = 300 [N]
FT = 425 [N]
FT = Total force
FT = 425 - 300 = 125 [N]
Since the magnitude of the force is positive, we conclude that the resultant of these forces is to the right.
What is the displacement of an object that moves from the origin to a position at - 12m
Answer:
Displacement, d = 12 meters
Explanation:
The displacement of an object that moves from the origin to a position at −12 m is 12 meters.
The distance from the origin to the maximum position is called displacement of an object. The maximum displacement of the particle in a wave is called crest and the minimum displacement is called the trough. -12 shows the displacement in negative axis.
So, the displacement of an object is 12 meters.
A student fires a cannonball vertically upwards. The cannonball returns to the
ground after a 4.60s flight. Determine all unknowns and answer the following
questions. Neglect drag and the initial height and horizontal motion of the
cannonball. Use regular metric units (ie. meters).
How long did the cannonball rise?
unit
What was the cannonball's initial speed?
unit
What was the cannonball's maximum height?
unit
V
Answer:
(a). The distance is 207 m.
(b). The initial velocity is 45.0 m/s
(c). The maximum height is 103.3 m
Explanation:
Given that,
Time = 4.60 s
We need to calculate the initial velocity
Using equation of motion
[tex]v=u-gt[/tex]
Put the value into the formula
[tex]0=u-9.8\times4.60[/tex]
[tex]u=45.0\ m/s[/tex]
We need to calculate the distance
Using formula of distance
[tex]d=v\times t[/tex]
Put the value into the formula
[tex]d=45\times4.60[/tex]
[tex]d=207\ m[/tex]
We need to calculate the maximum height
Using equation of motion
[tex]v^2=u^2-2gh[/tex]
Put the value into the formula
[tex]0=(45.0)^2-2\times9.8\times h[/tex]
[tex]h=\dfrac{(45.0)^2}{2\times9.8}[/tex]
[tex]h=103.3\ m[/tex]
Hence, (a). The distance is 207 m.
(b). The initial velocity is 45.0 m/s
(c). The maximum height is 103.3 m
what is the central mass of a apple ?
Dan steps on the brakes in his toy car which causes a braking force of 700 N to the left.
a) If Dan’s car weighs 750 N, then what is the mass of Dan’s car?
b) What is the acceleration of Dan’s car?
Answer:
76.53 kg; 9.15 m/s² left.
Explanation:
Given the following data;
Weight of car = 750N
Applied force = 700N
a) To find mass
Weight can be defined as the force acting on a body or an object as a result of gravity.
Mathematically, [tex] Weight, W = mg[/tex]
We know acceleration due to gravity is equal to 9.8 m/s²
Substituting into the equation;
[tex] 750 = m*9.8[/tex]
[tex]Mass, m = \frac{750}{9.8}[/tex]
Mass, m = 76.53kg
b) To find the acceleration;
Force is given by the multiplication of mass and acceleration.
Mathematically, Force is;
[tex] F = ma[/tex]
Where;
F represents force.m represents the mass of an object.a represents acceleration.Making acceleration (a) the subject, we have;
[tex]Acceleration (a) = \frac{F}{m}[/tex]
Substituting into the equation;
[tex]Acceleration (a) = \frac{700}{76.53}[/tex]
Acceleration (a) = 9.15 m/s² left.
Fill in the blanks to complete the statements.
A paper plane moving through the air experiences air _____ .
Frictional forces acting on an object are often converted into ______
energy, which causes the temperature of the object to rise slightly.
Answer:
Resistance and thermal
Explanation:
Edge 2020
A paper plane moving through the air experiences air resistance.
Frictional forces acting on an object are often converted into thermal energy, which causes the temperature of the object to rise slightly.
What is Frictional forces?Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.
What is thermal energy?Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy.
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A car started its motion from rest and accelerated for 7 seconds, with the acceleration of 3 m/s2. Then it was moving with a constant velocity for 8 seconds. What was the velocity of the car after 7+8 seconds?
PLEASE HELP ME
Answer:
Kejlshkdhh4hrbrldbd
is isopropyl alcohol a element compound or mixture
Answer:
Isopropyl is an element compound.
Explanation:
PLEASE HELP ME
A boulder is raised above the ground so that the gravitational potential energy relative to the ground is 310 J. Then it is dropped. What is its kinetic energy just before it hits the ground?
Answer:
try this
Explanation:
The energy of a falling object when it hits the ground is equaled to the energy it starts with because the potential energy is converted into kinetic energy entirely with the height at 0. This means the energy would be 200 J.
RESULT
what is an example of a criteria
Answer:
sat scores what the other person said lol
MORE POINT HAPPY FRIDAYYY HURRY
Answer:
thanks!
Explanation:
Carlos gets tired of pushing and instead begins to pull with force Fpull at an angle to the horizontal.
The block slides along the rough horizontal surface at a constant speed. A free-body diagram for the
situation is shown below. Blake makes the following claim about the free-body diagram:
Blake: “The velocity of the block is constant, so the net force exerted on the block must be zero.
Thus, the normal force FN equals the weight Fmg, and the force of friction Ff equals the applied
force Fpull.”
What, if anything, is wrong with this statement? If something is
wrong, identify it and explain how to correct it. If this statement is
correct, explain why.
Answer:
The wrong items are;
1) The normal for FN equals the weight Fmg
2) The force of friction, Ff, equals the applied force Fpull
The corrected statements are;
1) The normal force is weight less the vertical component of the applied force Fpull
FN = Fmg - Fpull × sin(θ)
2) The force of friction equals the horizontal component of the applied force Fpull
Ff = Fpull × cos(θ)
Explanation:
The given statement was;
The velocity of the block is constant, so the net force exerted on the block must be zero. Thus, the normal force FN equals the weight Fmg, and the force of friction Ff equals the applied force Fpull
By the equilibrium of forces actin on the system, given that the applied force acts at an angle, θ, with the horizontal, we have;
The normal force is equal to the weight less the vertical component of the applied force;
That is we have, FN = Fmg - Fpull × sin(θ)
The friction force similarly, is equal to the horizontal component of the applied force;
Ff = Fpull × cos(θ)
The wrong items are therefore as follows;
1) The normal for FN equals the weight Fmg
1 i) The normal force is weight less the vertical component of the applied force Fpull
FN = Fmg - Fpull × sin(θ)
2) The force of friction, Ff, equals the applied force Fpull
2 i) The force of friction equals the horizontal component of the applied force Fpull
Ff = Fpull × cos(θ).
For the first 10 seconds a squirrel runs 3 m/s to look for an acorn. The next 5 seconds he eats an acorn that he finds. Afterwards the squirrel runs 2 m/s back to where he started. (A) How long does it take for the squirrel to get back to where he started?
Distance covered by the squirrel to look for an acorn :
d = ( 3 m/s ) × 10 s = 30 m.
Time taken to eat an Acron is 5 seconds.
Time taken to cover distance of 30 m with 2 m/s speed is :
[tex]T=\dfrac{30}{2}\ s= 15 \ s[/tex]
Therefore, total time take to get back to where he started is ( 10+5+15 ) = 30 s.
Hence, this is the required solution.
Answer:
it wont let me commment so i need to know if the answer above is correct
Explanation:
Determine the weight of a 2959.0-kg car that is moving at a speed of 21 m/s. Enter a
numerical answer.
weight=mass*gravity
w=2959.0*10
w=29590N
The weight of a 2959.0-kg car that is moving at a speed of 21 m / s would be 28998.2 Newtons, here speed of the car is the redundant value that is not used to calculate the weight of the car.
What is gravity?It can be defined as the force by which a body attracts another body toward its center as the result of the gravitational pull of one body and another.
As given in the problem, we have to determine the weight of a 2959.0-kg car that is moving at a speed of 21 m / s .
The weight of the car = mass of the car × acceleration due to gravity
= 2959 × 9.8
= 28998.2 Newtons
Thus, the weight of a 2959.0-kg car that is moving at a speed of 21 m / s would be 28998.2 Newtons.
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Calculate: A baseball accelerates downward at 9.8 m/s2. The force pulling the ball downward is 1.4 N. What is the mass of the baseball?
[tex]\large{\underline{\underline{\red{\tt{\purple{\leadsto } AnsweR:-}}}}}[/tex]
Given : Acceleration of the ball is 9.8 m / s² . The pulling force is 1.4 N .
To Find : The mass of the ball .
Solution : It is given that a ball accelerates download with a acceleration of 9.8 m / s² . And the acting force is 1.4 N .
We know that , Force acting is equal to the product of mass and acceleration . That is ,
[tex]\boxed{\purple{\bf Force=mass\times acceleration}}[/tex]
⇒ Force = mass × accelerⁿ
⇒ 1.4 N = mass × 9.8 m / s²
⇒ mass = 1.4 N / 98 m/s²
⇒ mass = 14N / 98 m/s².
⇒ mass = 1/7 kg .
Hence the mass of the object is 1/7 kg ≈ 0.14 kg.
many atoms of each element are in one molecule of 2-heptanone?
A chemical structure of a molecule includes the arrangement of atoms and the chemical bonds that hold the atoms together. The 2-HEPTANONE molecule contains a total of 21 bond(s) There are 7 non-H bond(s), 1 multiple bond(s), 4 rotatable bond(s), 1 double bond(s) and 1 ketone(s) (aliphatic).
:/ hope this helps
A 20 N model rocket launched vertically is clocked at 25 m/s when it is 15 m above the ground (and has expended a negligible amount of fuel). Use the work–energy principle to find the rocket’s initial speed.
Answer:30.3 m/s
Explanation:
How long will it take to travel 150 km traveling at 50 km/hr?
Answer: 3 hours
Explanation: 150 km / 50 km = 3 hrs.
velocity is derived physical quantity why
Answer:
Velocity is “how much distance you cover in a particular time.” Space and time are fundamental quantities, and meters and seconds are their base units. Velocity is a combination of a space and a time, and therefore its units — “m/s” – are “derived” from the units for space and time
If you walk at 0.75 m/s, how far will you be in 2 hours? (hint change hours into
seconds) *
3.5 meters
75 meter
150 meters
5400 meters
1. According to Newton's third law of motion, how are action
and reaction forces related?
2. How is momentum conserved?
3. Suppose you and a friend, who has exactly twice your mass,
are on skates. You push away from your friend. How does the
force with which you push your friend compare to the force
with which your friend
pushes you? How do your
accelerations compare?
4. Thinking Critical be ly comparing and Contrasting
Which has more momentum, a 250-kg dolphin swimming
at 6 m/s, or a 450-kg manatee swimming at 2 m/s?
(need 1-4 answered ASAP)
Answer:
you couldn't do this on your own or search it up on google
HEY CAN ANYONE PLS ANSWER DIS!!!!!!
Answer:
chocolate chip model
Explanation:
Thomson's discovery of the electron completely changed the way people viewed atoms. He proposed the atom was a sphere, but the positive and negative charges were embedded within it. ... Thomson's model came to be called the "plum pudding model" or "chocolate chip cookie model".
In three to five sentences, evaluate the scientific evidence that supports the big bang theory and the steady state theory.
The universe was created due to an explosion that occured in space and that the universe is expanding but still maintains an average density that's constant.
Briefing:The Big Bang Theory proposes that a space-based explosion led to the creation of the universe. The space expanded because of the extraordinarily high temperature and density. The elements were then created after the cosmos cooled.
According to the Big Bang Theory, the universe was created by a tremendous explosion that took place billions of years ago. The stars and galaxies that exist in our universe were formed when matter was drawn together by gravity.
The steady state theory is a description of the idea that although the cosmos is expanding, its average density remains constant.
The steady state theory claims that even though the cosmos is expanding, its appearance remains unchanged.
In conclusion, the steady state hypothesis and the big bang theory both describe how the universe came into being.
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Energy can generally be considered to be either kinetic energy or potential energy. Some specific forms of energy, such as electrical, magnetic, and gravitational energy, can operate in the space around objects and affect other objects that come near. In these examples,
Answer: The options are not given.
Here are the options.
A. energy is continuously created.
B. energy is continuously destroyed.
C. energy exists in a field.
D. all of these
The correct option is C.
Energy exists in a field.
Explanation:
Energy is the ability to do work or the property i.e force or power that is moved to an object so that it can perform work.
Energy exists in a field because a field is a region in which each area is affected by a force or power on an object . For example a paper clip placed on a magnetic field require a force or power to be able to attract or repel magnets.
An electric field surronds an electric charge when another particle is around it, it uses energy to either attract or repel the object e.t.c.
Therefore energy exists in field.
13. A nuclear decay chain represents
the reason why only fission is more efficient than fusion for nuclear energy
a series of
decays producing sequentially more stable nuclei
b. the only possible type of decay that an isotope can undergo d. the process of nuclei becoming
increasingly energetic as they release radiation
Answer:
a series of decays producing sequentially more stable nuclei
Explanation:
A nuclear decay chain represents a series of decays producing sequentially more stable nuclei.
For every atomic nucleus, there is a specific neutron/proton ratio which ensures the stability of the nucleus. Any nucleus with a neutron/proton combination different from its stability ratio (i.e either too many neutrons or too many protons) will be unstable and split into one or more other nuclei with the attendant emission of small particles of matter. The decay process is a continuous chain reaction steps. Until stability of the nucleus is attain, it continues.PLEASE HELP!!
A person is traveling at 5m/s for around 20 minutes. how much distance did he cover? hint: change minutes to seconds.
if you go three times around a complete circular lawn of raidius r and reach the starting point, then the displacement is zero. true or false
Answer:
true
Explanation:
the starting point is zero so if you go back to the starting point it'll be zero since displacement is where you left off.
An object moves 120 m in 15 seconds. Calculate
the object's speed.
Answer:
8m/s
Explanation:
speed= distance/time
s= 120/15
= 8m/s
Three toy boats with the same mass were in a lake. Two boats were moving and one was stopped. Each boat got bumped by another boat, but not in the same direction. All the boats changed speed as a result of being bumped. Use the information in the diagram to answer. Which toy boat exprienced the strongest force when it was bumped ? How do you know ?
The answer is " The orange and gray toy boats experienced the strongest force because both gained the same force as they sped up the blue boat lost force so it slow down
Explanation:
Trust me I did this one for an assignment
The boat that will experience the strongest force is the boat that has the highest speed.
According to Newton's second law of motion, the force applied to an object is directly proportional to the product of mass and acceleration of the object.
F = ma
[tex]F = \frac{mv}{t}[/tex]
where;
F is the force experienced by the objectv is the velocity of the objectt is the time of motionThe force experienced by the boats is directly proportional to the velocity of their motion. Since the boats have the same mass, the force experienced by each boat will depend on the speed with which the boat moves.
Thus, the boat that will experience the strongest force is the boat that has the highest speed.
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