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Marianna [84]
3 years ago
9

Which statement is true about white dwarf?

Physics
2 answers:
kramer3 years ago
8 0

C is the correct answer

galben [10]3 years ago
6 0

White dwarf are very dense and small in size is a true statement.

Answer: Option C

<u>Explanation:</u>

A white dwarf also known as degenerate dwarf.  The white dwarf "mass is comparable to the Sun" and its "volume is comparable to Earth".

The white dwarf is a stellar whose size is near to the size of the earth. It had a gravitational collapse. The diameter of the white dwarf is just one percent of the Sun. It is extremely dense where there is no free space between the atoms.

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The capacitor is now disconnected from the battery, and the plates of the capacitor are then slowly pulled apart until the separ
alexdok [17]

Answer:

U₁ = (ϵAV²)/6d

This means that the new energy of the capacitor is (1/3) of the initial energy before the increased separation.

Explanation:

The energy stored in a capacitor is given by (1/2) (CV²)

Energy in the capacitor initially

U = CV²/2

V = voltage across the plates of the capacitor

C = capacitance of the capacitor

But the capacitance of a capacitor depends on the geometry of the capacitor is given by

C = ϵA/d

ϵ = Absolute permissivity of the dielectric material

A = Cross sectional Area of the capacitor

d = separation between the capacitor

So,

U = CV²/2

Substituting for C

U = ϵAV²/2d

Now, for U₁, the new distance between plates, d₁ = 3d

U₁ = ϵAV²/2d₁

U₁ = ϵAV²/(2(3d))

U₁ = (ϵAV²)/6d

This means that the new energy of the capacitor is (1/3) of the initial energy before the increased separation.

3 0
3 years ago
Water intake and hydration are positively correlated. This indicates that as water intake increases, hydration
goldenfox [79]
Increases is the correct answer
4 0
2 years ago
A deer walks 17.0 m south and then 12.0 m north. Find both the magnitude of its displacement and the distance traveled.
Zepler [3.9K]

Answer:

Explanation:

Displacement involves direction and distance.  In this case, the deer has walked a distance of 17 + 12 = 29m but because of the South-then-North direction, the net displacement is only 17-12 = 5m.

So the answer is A)   5.0 m, 29.0 m

7 0
3 years ago
Hans Christian Ørsted observed that when a current-carrying wire was brought near a compass, the compass needle moved.
BaLLatris [955]

Answer: magnet, motor

Explanation :

Hans Christian Orsted was the scientist who gives the relation between electricity and magnetism. He found that the magnetic needle gets deflected on the application of electric current to the circuit.

He observed that the current carrying wire acted like a magnet.  

In 1821 Michael Faraday understands Orsted's work and invented electric motor. An electric motor is a device which is used to convert electrical energy to mechanical energy.

8 0
3 years ago
Read 2 more answers
A wave has a wavelength of 8 mm and a frequency of 4 hertz. What is its speed?
Valentin [98]
Remember that the speed of a wave is the product of both the wavelength and the frequency of the wave.

First convert the units to m and then multiply the values to calculate its propagation or wave speed.

C = lambda • frequency.
3 0
3 years ago
Read 2 more answers
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