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sineoko [7]
2 years ago
7

A certain white dwarf star was once an average star like our Sun. But now it is in the last stage of its evolution and is the si

ze of our Moon but has the mass of our Sun.
Estimate gravity on the surface on this star.

I know the solution of this question it is as the picture shows but I only need to add *10^3 to the lower part of the division lower part to get the correct answer. But I don't know why I should add it can anyone explain?

Physics
1 answer:
solmaris [256]2 years ago
6 0

Answer:

4.384 * 10^13

Explanation:

Given the expression :

[(6.67 * 10^-11) * (1.99 * 10^30)] ÷ [(1.74*10^3)*(1.74*10^3)]

Applying the laws of indices

[(6.67 * 1.99) *10^(-11 + 30)] ÷ [(1.74 * 1.74) * 10^3+3]

13.2733 * 10^19 ÷ 3.0276 * 10^6

(13.2733 / 3.0276) * 10^(19 - 6)

4.3840996 * 10^13

= 4.384 * 10^13

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Calculate the root mean square velocity of nitrogen molecules at 25°c.
umka2103 [35]

Answer:

515.22 m/s

Explanation:

Formula for root mean square velocity is SQRT (3RT/M)

Where,

R = Rydberg's constant = 8.314 Kg. m²/ s². K. mol

T = Temperature in Kelvin

M = Molar mass in Kg/mol

First calculate molar mass,

As nitrogen is diatomic molecule,

Its molar mass is

M = 2(14) = 28 g/mol

Convert unit into Kg/mol

28 g/mol x 1 Kg/1000g = 2.8x10¯² Kg/mol

Convert temperature into kelvin

T = 25 + 273 = 298K

Put all values in formula

Vrms = SQRT (3RT/M)

Vrms = SQRT (3x8.314x298/2.8x10¯²)

Vrms = SQRT (265454. 14)

Vrms = 515.22 m/s

5 0
3 years ago
Relationship between Mass and weight.​
Kaylis [27]

Answer: Mass is the amount of matter in an object and weight is the pull of gravity on an object.

Explanation:

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6 0
2 years ago
Read 2 more answers
Can someone provide help for this question?
Aleksandr-060686 [28]

Answer: conduction

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7 0
2 years ago
When salt dissolves in water, what type of change occurs?
Soloha48 [4]

Question:

When salt dissolves in water, what type of change occurs?

Answer:

A physical change results in a change of the material's appearance, but no new chemical products result. So the answer would be A.

6 0
3 years ago
A 9.12 microFarad capacitor is measured to have a reactance of 268.0 Ohm. At what frequency (in Hz) is it being driven?
Katen [24]

Answer:

65.14 Hz

Explanation:

We have given the capacitance C=9.12\mu F=9.12\times 106{-6}F

And the capacitive reluctance = 268 ohm

The capacitive reluctance of a capacitive circuit is given by

X_C=\frac{1}{\omega C}

X_C=\frac{1}{2\pi f C}

268=\frac{1}{2\pi f \times 9.12\times 10^{-6}}

f=\frac{1}{2\times 3.14\times 268\times 9.12\times 10^{-6}}=65.14Hz

3 0
3 years ago
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