The star’s core shrinks, this happens first when a star begins to run out of fuel. Hence option A is correct.
What is star ?A star is a type of celestial object that consists of a bright spheroid of plasma kept together by self-gravity. The Sun is the closest star to Earth. Many other stars can be seen with the open eye at night, but due to their great distances from Earth, they appear as fixed points of light. Many of the brightest stars have proper names, and the most prominent stars have been classified into constellations and asterisms. Astronomers have put together star catalogues that identify known stars and offer conventional stellar designations. An estimated 1022 to 1024 stars exist in the visible cosmos. Only about 4,000 of these stars can be seen with the open eye, and they are all located within the Milky Way galaxy.
Hence option A is correct.
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6. A 55 kg skier is at the top of a slope, as shown in the illustration below. At the
initial point A, the skier is 10.0 m vertically above the final point B.
a. Set the zero level for gravitational potential energy at B, and find the gravitational
potential energy associated with the skier at A and at B. Then find the difference
in potential energy between these two points.
b. Repeat this problem with the zero level at point A
c. Repeat this problem with the zero level midway down the slope, at a height of 5.0
m.
The question mentions an illustration that is not provided, but I can solve the problem anyway.
Answer:
Ua - Ub = 5,390 J regardless of the reference height
Explanation:
Gravitational Potential Energy
Gravitational potential energy is the energy stored in an object because of its vertical position or height in a gravitational field.
It can be calculated with the equation:
U=m.g.h
Where m is the mass of the object, h is the height with respect to a fixed reference, and g is the acceleration of gravity or [tex]9.8 m/s^2[/tex].
The problem is about proving the difference in potential energy does not depend on the reference used to calculate them.
a. Let's set the zero level for gravitational potential energy at B, i.e., h=0 at B.
The m=55 kg skier is at the top of the slope (point A) at a height of h=10 m.
The gravitational potential energy Ua is:
Ua = 55 * 9.8 * 10 = 5,390 J
The gravitational potential energy Ub (h=0) is:
Ub = 55 * 9.8 * 0 = 0 J
The difference is:
Ua - Ub = 5,390 J - 0 J = 5,390 J
b. Now fix the zero level at point A (h=0).
The gravitational potential energy Ua (h=0) is:
Ua = 55 * 9.8 * 0 = 0 J
Point B is at a height h=-10 m since it's below the reference.
The gravitational potential energy Ub (h=-10) is:
Ub = 55 * 9.8 * (-10) = -5,390 J
The difference is:
Ua - Ub = 0 J - (-5,390 J) = 5,390 J
We get the same value.
c. Finally, fix the reference at the midpoint between A and B.
Point A is at a height h=5 m since it's 5 m above the reference.
The gravitational potential energy Ua is:
Ua = 55 * 9.8 * 5 = 2695 J
Point B is at a height h=-5 m since it's 5 m below the reference.
The gravitational potential energy Ub is:
Ub = 55 * 9.8 * (-5) = -2695 J
The difference is:
Ua - Ub = 2695 J - (-2695 J) = 5,390 J
Again, we get the same value.
Conclusion:
Ua - Ub = 5,390 J regardless of the reference height
How would you describe the movement of a transverse wave?
Up and down
Back and forth
In zigzags
Linear
Answer:
Up AND Down
Explanation:
a transverse wave goes up and Down
what is fuse short answer
Answer:
Its a fuse.
Explanation:
What is a group of two or more atoms that are held together by chemical bonds?
A.) formula
B.) molecule
C.) mixture
D.) element
Answer:
b
Explanation:
How are electric potential difference and electric potential energy related?
Answer: NOT B) Electric potential energy is the charge divided by the electric potential difference.
Explanation:
just missed it on edg
Answer: Choice C
Explanation:
HELP PLZ!!! what is the answer to number 8?
A 200 gram mass is placed on the meter stick 20 cm from the pivot point (the fulcrum). An unknown mass is positioned 8 cm from the fulcrum to balance the system. What is the mass of this unknown object?
Answer:
80 grams
Explanation:
multiplying 8 by 2.5 to get 20
so then deviding 200 by that 2.5 will get you 80 grams
This question involves the concepts of equlibrium and moment.
The mass of unknown object should be "500 g".
EQUILIBRIUMIn order to balance the meter stick equilibrium should be achieved. For equilibrium the moment due to each mass must be the same.
[tex]F_1d_1=F_2d_2\\m_1gd_1=m_2gd_2\\m_1d_1=m_2d_2[/tex]
where,
m₁ = mass of known object = 200 gm₂ = mass of unknown object = ?d₁ = distance from fulcrum of known object = 20 cmd₂ = distance from fulcrum of unknown object = 8 cmTherefore,
[tex](200\ g)(20\ cm)=(m_2)(8\ cm)\\\\m_2=\frac{(200\ g)(20\ cm)}{8\ cm}[/tex]
m₂ = 500 g
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Positive and negative charged objects will affect which type of field?
• gravitational
• electric
• magnetic
Answer:
Electric
Explanation:
Because they are charged objects
a ball kicked with a velocity of 8m/s at an angle of 30 degree to horizontal. calculate the time of flight of the ball. (g=10ms^2)
Answer:
Approximately [tex]0.8\; \rm s[/tex] (assuming that air resistance is negligible.)
Explanation:
Let [tex]v_0[/tex] denote the initial velocity of this ball. Let [tex]\theta[/tex] denote the angle of elevation of that velocity.
The initial velocity of this ball could be decomposed into two parts:
Initial vertical velocity: [tex]v_0(\text{vertical}) = v_0 \cdot \sin(\theta)[/tex].Initial horizontal velocity: [tex]v_0(\text{vertical}) = v_0 \cdot \cos(\theta)[/tex].If air resistance on this ball is negligible, [tex]v_0(\text{vertical})[/tex] alone would be sufficient for finding the time of flight of this ball.
Calculate [tex]v_0(\text{vertical})[/tex] given that [tex]v_0 = 8 \; \rm m \cdot s^{-1}[/tex] and [tex]\theta = 30^\circ[/tex]:
[tex]\begin{aligned}& v_0(\text{vertical}) \\ &= v_0 \cdot \sin(\theta) \\ &= \left(8 \; \rm m \cdot s^{-1} \right) \cdot \sin\left(30^{\circ}\right) \\ &= 4\;\rm m \cdot s^{-1} \end{aligned}[/tex].
Assume that air resistance on this ball is zero. Right before the ball hits the ground, the vertical velocity of this ball would be exactly the opposite of the value when the ball was launched.
Since [tex]v_0(\text{vertical}) = 4\; \rm m \cdot s^{-1}[/tex], the vertical velocity of this ball right before landing would be [tex]v_1(\text{vertical}) = -4\; \rm m \cdot s^{-1}[/tex].
Calculate the change to the vertical velocity of this ball:
[tex]\begin{aligned}& \Delta v(\text{vertical}) \\ & = v_1(\text{vertical}) - v_0(\text{vertical}) \\ &= -8\; \rm m \cdot s^{-1}\end{aligned}[/tex].
In other words, the vertical velocity of this ball should have change by [tex]8\; \rm m \cdot s^{-1}[/tex] during the entire flight (from the launch to the landing.)
The question states that the gravitational field strength on this ball is [tex]g = 10\; \rm m \cdot s^{-2}[/tex]. In other words, the (vertical) downward gravitational pull on this ball could change the vertical velocity of the ball by [tex]10\; \rm m\cdot s^{-1}[/tex] each second. What fraction of a second would it take to change the vertical velocity of this ball by [tex]8\; \rm m \cdot s^{-1}[/tex]?
[tex]\begin{aligned}t &= \frac{\Delta v(\text{initial})}{g} \\ &= \frac{8\; \rm m \cdot s^{-1}}{10\; \rm m \cdot s^{-2}} = 0.8\; \rm s\end{aligned}[/tex].
In other words, it would take [tex]0.8\; \rm s[/tex] to change the velocity of this ball from the initial velocity at launch to the final velocity at landing. Therefore, the time of the flight of this ball would be [tex]0.8\; \rm s\![/tex].
The maximum displacement of an oscillatory motion is A=0.49m. Determine the position x at which the kinetic energy of the particle is half it's elastic potential energy
Answer:
The position x, is ± 0.4 m.
Explanation:
The total mechanical energy of the oscillatory motion is given as;
[tex]E_T = U +K.E\\\\E_T = \frac{1}{2} kA^2\\\\ \frac{1}{2} kA^2 = U +K.E\\\\K.E = \frac{1}{2} kA^2 - U ----equation(1)[/tex]
When the kinetic energy (E) is half of the elastic potential energy (U);
[tex]K.E = \frac{U}{2} ----equation(2)[/tex]
Equate (1) and (2)
[tex]\frac{U}{2} = \frac{1}{2} kA^2 - U\\\\U = kA^2 -2U\\\\U+2U = kA^2\\\\3 U = kA^2\\\\3(\frac{1}{2} kx^2) = kA^2\\\\\frac{3}{2} x^2=A^2\\\\x^2 = \frac{2}{3} A^2\\\\x = \sqrt{\frac{2}{3} A^2} \\\\x = A\sqrt{\frac{2}{3} } \\\\x = 0.49\sqrt{\frac{2}{3} }\\\\x = + /- (0.4 \ m)[/tex]
Thus, the position x, is ± 0.4 m.
what's beyond the universe
Answer:
Nobody knows...
Explanation:
What is championship game of baseball called? The World Series The Super Bowl The World Cup
Answer:
The World Series
Explanation:
The Super Bowl is the championship American Football game, and the World Cup is the Soccer/Football game.
American Football and Football are different things. The first is what Americans call football, while the other is what Americans call soccer. It is confusing.
_____ is the sum of all potential and kinetic energy.
Group of answer choices
Law of Conservation of Energy
Gravitational Potential Energy
Stored energy
Mechanical Energy
Answer:
Mechanical EnergyExplanation:
Mechanical energy is the sum of all potential energy and kinetic energy .
I HOPE IT HELPS ❤❤3. When water droplets are pushed through sand, gravel and carbon filters is the
water clean and ready to drink? Why or why not?
Answer:
i think yes, because the sand together with the filters catches all the impurities of the water that will pass through them. (btw sorry for my English, this is translated from my language in translator, so don't mind my English pls)
Water has a relatively low specific heat.
True
False
Answer:
The answer is False
Explanation:
Hope this helps :)
facts about conolizing into mars?
Mars is the focus of much scientific study about possible human colonization. Its surface conditions and the presence of water on Mars make it arguably the most hospitable of the planets in the Solar System, other than Earth. Mars requires less energy per unit mass (delta-v) to reach from Earth than any planet except Venus.
Permanent human habitation on a planetary body other than the Earth is one of science fiction's most prevalent themes. As technology has advanced, and concerns about the future of humanity on Earth have increased, the argument that space colonization is an achievable and worthwhile goal has gained momentum. Other reasons for colonizing space include economic interests, long-term scientific research best carried out by humans as opposed to robotic probes, and sheer curiosity.
One of Elon Musk's stated goals through his company SpaceX is to make such colonization possible by providing transport, and to "help humanity establish a permanent, self-sustaining colony on Mars within the next 50 to 100 years".
Many organizations support the colonization of Mars. They have also given different reasons and ways humans can live on Mars. One of the oldest organizations is the Mars Society. They promote a NASA program that supports human colonies on Mars. The Mars Society have set up Mars analog research stations in Canada and the United States. All other organizations include MarsDrive, who wants to help fund settlements on Mars, and Mars to Stay. Mars to Stay advocates settlements on Mars. In June 2012, Mars One released a statement that they believe could help start a colony on Mars by 2023.
What layer of the atmosphere is hot but does not have enough gas molecules to transfer heat to you (i.e., you would not feel the heat of the layer)?
Group of answer choices
Thermosphere
Tropopause
Stratopause
Answer:
thermosphere...........
Which is a vector quantity?
speed
time
acceleration
distance
Answer:
the quantity which has both magnitude and direction is called vector quantity
Explain why pulleys are in the lever family.
Answer:
The leverage or mechanical advantage of pulleys is less obvious, but you can "gang" multiple pulleys together into two sets (blocks) and run the ropes back and forth between the two sets to increase the number of lengths of rope running between them. One end of the rope is connected (fixed) to one of the blocks, and you get to pull on the other end after it is passed back and forth between the blocks of pulleys. This is sometimes called a block and tackle arrangement. With a hook on each side of the block set, you can move a heavy load much like levers do, by multiplying the force. You have to pull more rope just like you have to move a lever more on one side of the fulcrum as compared to the other. When you get all the rope pulled out that you can, you can not move the load anymore because you have become "two-blocked" which means the two blocks are together. Credits to: Moin Khan
HELP! FOR A TEST!
The slope of a velocity versus time graph is the object's:
acceleration
displacement
position
velocity
Answer:
On a velocity vs time graph the slope of the line represents the acceleration of the object. With a slope of zero, the object is moving at a constant velocity in the positive (+) direction during this five minute interval. ... Displacement and distance can both be determine on a velocity vs.Answer:
Acceleration
Explanation:
plato
If the orbital velocity of a satellite is 2 rad/s then what will be the period of satellite.
Select one:
a. 2 sec
b. 3.14 sec
c. 6 sec
d. 8 sec
Answer:
Using the orbital velocity as deg/time or the angular speed:
1 rev / sec = 2 * pi rad / sec since there are 2 pi rad in a revolution
2 rad/sec = 1 / pi rev/sec = f from above
P = 1 / f = pi sec/rev = 3.14 sec/rev
Which type of exercise program involves a series of exercises interspersed with rest periods?
a
circuit training
b
interval training
c
calisthenics training
d
weight training
Answer:
B) interval training
Explanation:
Interval training is a type of training in which the period of intense activity alternates with the period of active recovery. The duration and intensity of the work interval together with the duration and intensity of the recovery interval make up one series.
When planning interval training, it is necessary to determine: 1. the duration and intensity of the working interval, 2. the duration and intensity of the recovery interval, and 3. the total number of series.
Precisely because of the larger number of variables and the unlimited possibility of combinations, interval training is more efficient and interesting than continuous training.
If Sophie climbs a ladder 3.4 m tall, and Sophie has a mass of 48 kg, how much G.P.E. has she gained?
Answer:
Sophie gained 1,599.36 J of GPE
Explanation:
Gravitational Potential Energy (GPE)
Gravitational potential energy is the energy stored in an object because of its vertical position or height in a gravitational field.
It can be calculated with the equation:
U=mgh
Where:
m = mass of the object
h = height with respect to a fixed reference
g = acceleration of gravity ([tex]9.8 m/s^2[/tex])
Sophie has a mass of m=48 Kg and climbs a ladder that takes her to a height of h=3.4 m.
Calculate the GPE she gained:
U = 48 * 9.8 * 3.4
U = 1,599.36 J
Sophie gained 1,599.36 J of GPE
a.) What happens when a force is applied to an atom? b.) What is this called?
Answer:
it binds the negatively charged electrons to the positively charged atomic nucleus.
Explanation:
its called Electromagnetic Force
1. What have modern observations shown sunspots to be?
Answer:
[tex].[/tex]
Explanation:
sunspots are areas that appear dark on the sun's surface.They appear dark because they are colder that parts of the sun's surface. However, the temperature of a sunspot is still very high. This can cause a sudden burst of energy space. If a solar flare is very intense, the radiation it releases can interfere with our radio communication here on earth
According to the Law of Reflection, the angle of incidence
the angle of reflection
A. equilis
B. is less than
C. is opposite from
D. is greater than
Answer:
A
Explanation:
this is because the law of reflection states that the angle of incidence equals to the angle of the reflection.
hope this helps, if not please report it
someone else can try it
What is the current in a copper wire if 650C of charge passes through it in 6 minutes
1. 180A
2. 18A
3. 1.8A
4. 108A
Answer:
3. 1.8A
Explanation:
Given the following data;
Quantity of charge, Q = 650C
Time = 6 minutes to seconds = 6 * 60 = 360 seconds.
To find the current l;
Quantity of charge = current * time
Substituting into the equation, we have;
650 = current * 360
Current = 650/360
Current = 1.8 Amperes
An empty can of soda is yeeted (thrown) into a crowd. Then, a full can of soda is yeeted into a crowd. Throwing the full can took more force to than the empty one to reach the same acceleration. Which law does this show?
Answer:
Newton's third law of motion.
Explanation:
We are told the force needed to throw the full soda can was more than that needed to throw the empty can.
Now, the weight of the full soda can will be more than that of the empty can. Therefore, the full can will demand more force than that of the empty can due to Newton's third law of motion which states that to every action, there is an equal and opposite reaction.
Start Point: an unlit match. End Point: a lit match.
Answer:
Ok
Explanation:
4. When a ray of light is incident at a critical angle in denser medium, the angle
of refraction in rarer medium is
A 0°
B 45°
C 90°
D 180°
Answer:
C. 90°
Explanation:
The critical angle is that angle of incidence in the dense medium where the angle of refraction is 90°.
In this case, light travels from the more optically dense medium to the less optically dense medium.
When the angle of incidence in the dense medium is equal to the critical angle, the angle of refraction is 90°.