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3 years ago

A white dwarf is:______.

Physics

1 answer:

bija089 [108]3 years ago

6 0

Answer:

the exposed core of a dead star, supported by electron degeneracy pressure.

Explanation:

A white dwarf is a low luminosity exposed core of a dead star having mass comparable to the sun but volume comparable to the earth . So its density is very high . These stars have lost the capacity to generate energy through the process of fusion . Due to high gravitational energy , it goes on shrinking but ultimately balanced by electron degeneracy pressure. It is not a main sequence star as it has lost the power of fusion .

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Please please please please please please please please please help me for these 2 questions

weqwewe [10]

Answer:

75j

Explanation:

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3 years ago

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How does an insulator stop the flow of an electric current?

s2008m [1.1K]

The answer is B hope I helped

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The pressure gauge on a tank registers the gauge pressure, which is the difference between the interior pressure and exterior pr

Arisa [49]

Answer:

9.67 kg

Explanation:

If the gauge pressure is 43 atm, the absolute pressure is 44 atm

p1 = 44 atm = 4.46 MPa

If the gauge pressure is 29.4 atm, the absolute pressure is 30.4 atm

p2 = 30.4 atm = 3.08 MPa

The ideal gas state equation is

p * V = m * R * T

We can set two eqaution for these two times

p1* V1 = m1 * R * T1

p2* V2 = m2 * R * T2

SInce V1 = V2 and T1 = T2

p1 = m1 * R

p2 = m2 * R

Rearranging

R = p1 / m1

R = p2 / m2

Equating:

p1 / m1 = p2 / m2

m2 = m1 * p2 / p1

m2 = 14 * 3.08 / 4.46 = 9.67 kg

7 0

3 years ago

g determine what frequency is required of a source powering a 100 uf capacitor a 500 ohm resistor and a s50 mH inductor in serie

polet [3.4K]

Answer: $71.16\ Hz$

Explanation:

Given

Capacitance $C=100\ \mu F$

Resistance $R=500\ \Omega$

Inductance $L=50\ mH$

In LCR circuit, current is maximum at resonance frequency i.e.

$X_L=X_C\ \text{and}\ \omega_o=\dfrac{1}{\sqrt{LC}}$

Insert the values

$\Rightarrow \omega_o=\dfrac{1}{\sqrt{50\times 10^{-3}\times 100\times 10^{-6}}}\\\\\Rightarrow \omega_o=\dfrac{1}{\sqrt{5}\times 10^{-3}}\\\\\Rightarrow \omega_o=0.447\times 10^{3}$

Also, frequency is given by

$\Rightarrow 2\pi f=\omega_o\\\\\Rightarrow f=\frac{\omega_o}{2\pi}$

$\Rightarrow f=\dfrac{1}{2\pi}\times 0.447\times 10^3\\\\\Rightarrow f=71.16\ Hz$

8 0

3 years ago

Twin brothers, Andy and Brian, can mow their grandparents lawn together in 1212 minutes. Brian would mow the lawn by himself

Karo-lina-s [1.5K]

Answer:

It will take Andy 1.198minutes to mow the lawn and it will take Brian 1,209.98minutes to mow the same lawn.

Step-by-step explanation:

Using the simultaneous equation concept, let A denote Andy and B be Brian

Andy and Brian can mow the lawn for 1212minutes i.e A+B = 1212..eqn 1

If Brian would mow the lawn by himself in 1010 minutes more than it would take Andy, this means B=1010A...eqn 2.

Substituting eqn 2 into eqn 1

Equation 1 becomes

A+1010A=1212

1011A=1212

A=1212/1011

A=1.198

B = 1010×1.198

B=1,209.98

Therefore, It will take Andy 1.198minutes to mow the lawn and it will take Brian 1,209.98minutes to mow the same lawn.

6 0

3 years ago