Answer:
The Galactic Center (or Galactic Centre) is the rotational center, the barycenter, of the Milky Way galaxy. Its central massive object is a supermassive black hole of about 4 million solar masses, which powers Sagittarius A*, a compact radio source which is almost exactly at the galactic rotational center.
The flash was running around Central City when he runs into the villain Gorilla Grodd. Gorilla Grodd releases the spring loaded trap that is underneath the Flash which propels him upwards 20 m. If the Flash has a mass of 80kg and the spring was compressed 4m, what is the constant of the rubber band?
PE = 1/2 kx²
mgh = 1/2 kx²
80.9.8.20 = 1/2 k.4²
k = 1960
Good morning! Can someone please answer this, ill give you brainliest and you will earn 50 points.
Answer:
Explanation:
temperature and energy: the only answer that mentions temperature is -
surface temperature and ocean temperature
atmospheric composition: the only answer that mentions air gases is -
carbon dioxide and other greenhouse gases
ocean and water: the only answers that mentions ocean is -
ocean acidification and sea level
cryosphere: cryo means cold and the only answers that mentions anything cold is -
sea ice and glaciers
Which of the following regions have extreme scarcity of water chose all that apply. 1. Australia 2. Southwest of the United States 3. Russia 4. East coast of the United States
Answer:
I would say 1 and 2. I am not sure so Im going with my gut and so should you:) lol
Explanation:
A meteoroid changed velocity from 1. 0 km/s to 1. 8 km/s in 0. 03 seconds. What is the acceleration of the meteoroid?.
Acceleration be a
[tex]\\ \rm\Rrightarrow a=\dfrac{v-u}{t}[/tex]
[tex]\\ \rm\Rrightarrow a=\dfrac{1.8-1}{0.03}[/tex]
[tex]\\ \rm\Rrightarrow a=0.8/0.03[/tex]
[tex]\\ \rm\Rrightarrow a=26.67km/s^2[/tex]
Question :-
A Meteoroid changed Velocity from 1.0 km/s to 1.8 km/s in 0.03 sec . What is the Acceleration of the Meteoroid ?Answer :-
Acceleration of the Meteoroid is 26.72 km/s² .[tex] \rule {180pt} {2pt} [/tex]
Given :-
Initial Velocity = 1 km/sFinal Velocity = 1.8 km/sTime = 0.03 secondsTo Find :-
Acceleration = ?Solution :-
As per the provided information in the given question, we have been given that the Initial Velocity of the Meteoroid is 1 km/s . Its Final Velocity is given 1.8 km/s . Time is given as 0.03 seconds . And, we have been asked to calculate the Acceleration of the Meteoroid .
For calculating the Acceleration , we will use the Formula :-
[tex] \bigstar \: \: \boxed{ \: \sf {Acceleration \: = \: \dfrac{ \: v - ᴜ \: }{ᴛ} \: }} \\ [/tex]
Where ,
v denotes to the Final Velocityᴜ denotes to the Initial Velocityᴛ denotes to the TimeTherefore , by Substituting the given values in the above Formula :-
[tex] \longmapsto \: \: \sf{Acceleration \: = \: \dfrac{ \: 1.8 \: - \: 1 \: }{0.03} } [/tex]
[tex] \longmapsto \: \: \sf{Acceleration \: = \: \dfrac { \: \: 0.8 \: \: }{ \: \: 0.03 \: \: } } \\ [/tex]
[tex] \longmapsto \: \: \sf{Acceleration \: = \: 26.72} \\ [/tex]
Hence :-
Acceleration = 26.72 km/s² .[tex] \underline {\rule {180pt} {4pt}} [/tex]
light reflects from two plane mirrors that meet each other at a right angle.if the incoming ray makes an angle of 20 degrees with the first mirror what is the angle of reflection at the second mirror
Answer:
angle of reflection is 20
Explanation:
because angle of incidence is equal to angle of reflection
A railway wagon of mass 100 kg is pulled with a force of 1000 N. what is its Acceleration ?
Solution,
Mass(m)= 100kgForce(F)= 1000NAcceleration (a)=?We know that,
[tex]f = ma \\ \frac{f}{m} = a \\ \frac{1000}{100} = a \\ 10 = a[/tex]
Therefore,
Acceleration produced will be 10m/s².
A car accelerates on a horizontal surface, with friction, over a distance. Which equation is equal to the work done by the engine of the car?
A. (change in kinetic energy of the car) + (frictional force) (distance)
B. (change in kinetic energy of the car) - (friction energy) (distance)
C. (change in momentum of the car) - (friction energy) (distance)
D. (change in potential energy of the car) + ( frictional energy) (distance)
Answer:
B
Explanation:
The equation is equal to the work done by the engine of the car will be (change in kinetic energy of the car) - (friction energy) (distance).
What is the work-energy theorem?From the work-energy theorem, It is stated that The net work done is equal to the change in the kinetic energy.
[tex]\rm W_{net}=K_f-K_i[/tex]
The initial kinetic energy is [tex]\rm K_I[/tex]
The final kinetic energy is [tex]\rm K_f[/tex]
The equation equal to the work done by the engine of the car will be the subtraction of the change in kinetic energy of the car and the product of the frictional force and the distance.
[tex]\rm W_{net}=K_f-K_i - F_f \times d[/tex]
Hence option B is correct.
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which of the following is a point source of water population?
a. City streets
b. A farm
c. Gas-burning vehicles
d. A suburban development
Answer:
city streets
sorry if it's wrong!Why is it important to oil machine regularly?
To reduce friction between the moving parts of the machine.
Two objects are being lifted by a machine. One object has a mass of 4 kg, and is lifted at a speed of 5 m/s. The other has a mass of 8 kg and is lifted at a rate of 7 m/s. Which object had more potential energy when it was lifted a distance of 10 m? What does this tell you about the variable(s) that impact gravitational potential energy?
Answer:
The object that weighs 8kg.(sorry if it's wrong)
Explanation:
The heavier an object is the more potential energy it has.When a light wave enters a medium of greater optical density, select two of the characteristics that will decrease in the wave,
A speed
B
frequency
С
wavelength
D
period
E
amplitude
F
height
Answer:
The speed (A) will decrease
V = F λ (the frequency F remains the same to maintain continuity across the interface)
Therefore (C) the wavelength must decrease
Note: n = speed of light in air / speed of light in medium
When a light wave enters a medium of greater optical density the two characteristics that are: (A) Speed, and (C) Wavelength will decrease in the wave.
It is given that a light wave enters a medium of greater optical density.
It is required to find the characteristics that will decrease.
What is light?It is defined as the type of waves such as sound waves or ocean waves but waves carry energy. Light does not need any medium to travel.
We know that:
[tex]\lambda =\frac{v}{f}[/tex]
Where Lamda (λ) = Wavelength
([tex]v[/tex]) = Speed of wave
[tex](f)[/tex] = Frequency of the wave.
The frequency remains the same to maintain continuity across the interface.
thus Speed of wave and Wavelength will decrease.
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what is the force constant of spring which is streched
a.2mm by a force of 4N
b.4cm by a mass of 200g
c.2cm by a mass of 1kg
Explanation:
a. F=kx
4=k (2×10^-3)
k= 2000 N/m
b. mg=kx
0.2 ×10 = k (4×10^-2)
2/(4×10^-2) =k
k=50 N/m
c. mg=kx
1×10 = k (2×10^-2)
½ × 10² =k
k=50N/m
A plane mirror forms a virtual image. give reasons
Explanation:
So ,plane mirror forms a virtual image.
an unbalanced force of 10 N causes an object to accelerate at 2 m/s. What is the mass of the object? ___kg
Answer: mASS OF OBJECT = 5 KG
Explanation: BY USING FORmULA OF UNBALANCE FORCE
F = ma
10 = m x 2
m = 10 / 2
m = 5 kg
A beam of light, traveling in air, strikes a plate of
transparent material at angle of incidence of 56 degrees. It is observed that the reflected and refracted beams form an angle
of 90 degrees. What is the index of refraction of this material?
Explanation:
I hope you benefit from me...
Tonight in the sky the Moon can be seen next to a very bright star named Aldebaran. How soon will the Moon be seen next to that same star
Moon will be seen next to that same star in 27.3 days. It is the time required for the Moon to orbit around the Earth.
What time is required for a lunar orbit?The Moon is a natural satellite that needs approximately 27.3 days to complete a full orbit around the Earth planet.
Moreover, the Earth's planet needs approximately 365 days to reach a full orbit around its star, the Sun.
In consequence, both the Earth planet and its natural satellite (Moon) orbit around the Sun.
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Im doing the MT. Thielson
1. Title slide
2. status of the glaciers (are they growing or shrinking,
how fast, how many are there in your assigned area)
the impact of those changes on the local water cycle
(think rivers and lakes and be specific - what lakes
and rivers? Include some pictures of the ones that
you talk about)
3. how glaciers have shaped the mountain and the
area around it.
4. Other features of interest (what people do on or
around the mountain/range, what other points of
interest are nearby - describe and include pictures).
5. Bibliography slide - this can be very informal. Just
copy/paste the URLs from the sites where you find
information.
I can help you.
I can make a slides and send it to you. this is actually very simple. just takes some time. I can do it.
All but one statement below is true. Find the false statement about the Heating Curve. Consider the heating curve of this unknown, substance X. Please alert your teacher if this image is missing. All but one statement below is true. Find the false statement about the Heating Curve. The melting point is 20°C. Throughout the heating curve (A --> E), kinetic energy is increasing. At point C, substance X is in the liquid state. During B and D, the potential energy of substance X is increasing as it undergoes a state change.
The various points on the heating curve corresponds to melting, boiling and vaporization.
Heating curveA heating curve is a plot of temperature against time. The heating curve reveals how the temperature of the body changes with time during heating.
The heating curve is not shown here hence the question is incomplete. However, we must note that The various points on the heating curve corresponds to melting, boiling and vaporization.
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Answer: I'm not exactly sure, but I would say the answer is
B. Throughout the heating curve (A --> E), kinetic energy is increasing.
Explanation: Throughout the entire heating curve diagram, it is not ALWAYS the kinetic energy increasing because Points B and D shows the potential energy increasing as it goes through the phase changes.
I'm sorry if it isn't right, but to lower the chances, I know for sure that the incorrect answers are C and D.
You hold a pen up in the air and then let go of it. The pen's inertia is its tendency to
- maintain a constant speed
why is this
Explanation:
The gravity gives the pen a constant force pointing to the center of the earth. And because of Newton's Second law: The acceleration of an object is directly proportional to the force it receives, inversely proportional to its mass, and the direction of acceleration is the same as the direction of the force.
So the pen has a tendency to going straight down on the ground. I don't think it maintain a constant speed but a constant acceleration. And the rate of the acceleration is approximate 9. 8m/s^2.
And as for its inertia, Newton's original statement in Principia mathematica was that any body should remain in uniform motion in a straight line or at rest until an external force forces it to change its motion. Bodies are too lazy to move if you don't force them. The moment you let go of the pen, the initial speed is zero. And it gains a acceleration of 9. 8m/s^2
According Newton's law of inertia, the pen tends to continue in its state of motion or rest. Hence, the pen tends to move in a constant velocity.
What is inertia ?Newton's first law of motion states that, every objects tends to continue on the state of motion or rest until an external force acts on it. This tendency of objects is called inertia.
We can experience inertia in many situations. A very common example is ,when a stationary bus move backward when it started quickly that it tends to stay on rest. Similarly we will move forward when the bus suddenly breaks.
The similar effect is encountered in the pen here. When it moves through the air, except the air resistance no other force to resist its motion and it tends to move in a constant speed.
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What happens when light waves strike a mirror?
Most of the light waves are refracted.
Most of the light waves are absorbed.
Most of the light waves are scattered.
Most of the light waves are reflected.
Answer:
most light waves are scattered or are either reflected
Explanation:
the light waves bounce after hitting the mirror.
Answer:
most light waves are reflected
explanation:
when light hits a mirror it bounces back at the same angle it hit this is called reflection refraction on the other hand Refraction is the bending of light
Image result for what is refraction of light
Refraction is the bending of light
The simplest way to estimate the age of the universe is from.
Answer: There really aren't many ways to estimate how old the universe is but, astronomers start by looking at the oldest stars in the universe.
Explanation:
Answer:
The big bang 13.7 billion years ago
Explanation:
Everything started 13.7 billion years ago that is when the big bang started.
Atoms of which pair of elements will form metallic bonds in a compound?
A. I and F
B. Be and Cl
C. Ag and Ca
D. Na and Br
that is a silly question: C
Metals¡¡¡¡¡¡¡¡¡¡¡¡¡¡
Atoms of which Ag and Ca will form metallic bonds in a compound. So, the correct option is C.
What is meant by metallic bond ?Metallic bond is defined as the type of chemical bonds, through which the atoms in metals are held together.
Here,
The metallic bond arises between two atoms, due to the electrostatic force of attraction between the conducting electrons and the metal ions.
The silver metal atoms, Ag are held together in their crystal by means of metallic bond.
The atoms of silver(Ag) and calcium(Ca) will form intermetallic bonds between them, when they are in a compound.
Compounds like Ca₅Ag₃ and Ca₃Ag, etc. can be formed through the intermetallic bonds.
Hence,
Atoms of which Ag and Ca will form metallic bonds in a compound.
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A 71 kg hiker climbs to the top of a 4300 m -high mountain. The climb is made in 5. 5 h starting at an elevation of 2800 m. Calculate the work done by the hiker against gravity. Calculate the average power output in watts. Calculate the average power output in horsepower. Calculate assuming the body is 16% efficient, what rate of energy input was required
Answer:
A. 1.0x10^6 J
B. 53 W
C. 7.1x10^-2
D. 330 W
Explanation:
A) work done = mgh
so 71*9.8*1500=1.0x10^6 J
B) power = Work done/time
So P=1.0x10^6/19800 sec
P= 53 W
C) 1 HP =735 W
503 W= 7.1x10^-2 HP
D) efficiency =(output/ input) *100
so 16= (53/input) *100
input= 7.1x10^-2
Which element is MOST LIKELY to be dull?
carbon
aluminum
mercury
sodium
as a blade? murcury because it stays liquid at room temp. it would be a puddle with a hanfle which is like... really dull
What direction does the magnetic needle of a compass point to?.
Answer:
the magnetic needle of a compass point to north and the other needle points to south
Explanation:
Keesha conducts an experiment by pouring equal amounts of boiling water into four containers. The containers are the same size and shape, but they are made of different materials. The chart lists the containers according to their materials. A 2-column table with 4 rows. The first column labeled Container has entries W, X, Y, Z. The second column labeled Material has entries foam, glass, plastic, stainless steel. Using protective gloves, Keesha carefully touches each container immediately after pouring the water. Which container was likely the hottest? W X Y Z.
Option Z is correct. The stainless steel container was likely the hottest. Stainless steel is an excellent heat conductor because it quickly warms the substance.
What are the qualities of stainless steel?Stainless steel is an excellent heat conductor because it quickly warms the substance or allows heat to travel through it. Stainless steel is also corrosion-resistant.
Foam, glass, and plastic, on the other hand, are all poor heat and electrical conductors. As a result, they do not allow heat to travel through.
As a result, we may deduce that, among the available possibilities, the stainless steel container was most likely the hottest.
Hence Option Z is correct. The stainless steel container was likely the hottest.
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can someone please answer this, ill give you brainliest and your getting 100 points.
Answer:
D
Explanation:
I have no explanation but it should be right just like the core of earth
Answer:
Asthenosphere
Explanation:
B is the correct option
C and D are part of earth's coreD denotes to inner coreC denotes to inner coreLess massive molecules tend to escape from an atmosphere more often than more massive ones because
A. they are more buoyant.
B. the gravitational force on them is less.
C. they are smaller and thus experience fewer collisions on their way out.
D. they are moving faster.
We can confirm that less massive molecules tend to escape from an atmosphere more often than more massive ones because they are moving faster.
How does speed help molecules escape?This has to do with the energy of the molecules. Speed comes with its higher kinetic energy. This higher level of energy helps the molecules to escape by giving them enough energy to overpower the force of gravity acting upon them in the atmosphere.
Therefore, we can confirm that less massive molecules tend to escape from an atmosphere more often than more massive ones because they are moving faster.
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Pls help. Very urgent!
To have a substance change phase from a solid to a liquid you must ____
A. increase the thermal energy of the substance
B. increase the temperature to 0 degrees
C. put the object in a fire
D. first shred the aluminum cans and then heat them until they melt
The Answer is A
I just guessed and I think it's the right answer.
Answer:
C
put the object in fire to make solid to liquid
One of the fastest elevators in the world is found in the Taipei 101 building. It ascends at 16. 83 m/s and rises 382. 2 m. Each elevator has a maximum load capacity of 1600 kg. What power is required to raise a load of 1160 kg from the lowest level to the top floor?
This question involves the concepts of potential energy, power, and time.
The power required to raise the load from the lowest level to the top floor is "264.16 KW".
PowerThe power required by the lift can be calculated by the following formula:
[tex]P = \frac{P.E}{t}[/tex]
where,
P = power = ?P.E = Potential Energy = mghm = mass load capacity = 1600 kgg = acceleration due to gravity = 9.81 m/s²h = height achieved = 382.2 mt = time = [tex]\frac{h}{v}[/tex]v = speed = 16.83 m/sTherefore,
[tex]P=\frac{mgh}{\frac{h}{v}}\\\\P = mvg = (1600\ kg)(16.83\ m/s)(9.81\ m/s^2)[/tex]
P = 264163.68 = 264.16 KW
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