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3 years ago

Is the speed of light faster in helium or air?

Physics

1 answer:

frosja888 [35]3 years ago

7 0

The speed of light is faster in helium.

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You plan to take a trip to the moon. Since you do not have a traditional spaceship with rockets, you will need to leave the eart

hichkok12 [17]

Answer:

$v = 3.5 \times 10^5 m/s$

Explanation:

At some distance from the Earth the force of attraction due to moon is balanced by the force due to Moon

so we will have

$\frac{GM_em}{r^2} = \frac{GM_m}{(d-r)^2}$

now we have

$\frac{d - r}{r} = \sqrt{\frac{M_m}{M_e}}$

$\frac{3.844\times 10^8 - r}{r} = \sqrt{\frac{7.36 \times 10^{22}}{5.9742\times 10^{24}}}$

so we will have

$r = 3.46 \times 10^8 m$

Now by energy conservation

$-\frac{GM_e}{R_e} - \frac{GM_m}{d - (R_e + R_m)} + \frac{1}{2}v^2 = -\frac{GM_e}{r} - \frac{GM_m}{d - r}$

$-6.26 \times 10^{8} - 13046 + \frac{1}{2}v^2 = -1.15 \times 10^6 - 1.28 \times 10^5$

$v = 3.5 \times 10^5 m/s$

7 0

3 years ago

Human resource professionals are reviewing the needs of a company that is

Klio2033 [76]

Recruitment i think.

3 0

3 years ago

Read 2 more answers

12080 gallons per month into liters per hour

Alex

62 liters or 62.640 if you need decimal.

6 0

3 years ago

A tire swing hanging from a branch reaches nearly to the ground. How could you estimate the height of the branch using only a st

AlexFokin [52]

Answer:

Explanation:

With the help of expression of time period of pendulum we can calculate the height of the branch . The swinging tire can be considered equivalent to swinging bob of a pendulum . Here length of pendulum will be equal to height of branch .

Let it be h . Let the time period of swing of tire be T then from the formula of time period of pendulum

$T = 2\pi\sqrt{\frac{l}{g} }$ where l is length of pendulum .

here l = h so

$T = 2\pi\sqrt{\frac{h}{g} }$

$h = \frac{T^2g}{4\pi^2}$

If we calculate the time period of swing of tire , we can calculate the height of branch .

The time period of swing of tire can be estimated with the help of a stop watch . Time period is time that the tire will take in going from one extreme point to the other end and then coming back . We can easily estimate it with the help of stop watch .

4 0

3 years ago

What will the temperature of the cosmic microwave background be when the average distances between galaxies are 1.7 times as lar

Aliun [14]

Answer:

$T'=1.58K$

Explanation:

As the Universe expands, the photons of the cosmic microwave background increase its wavelength, making its temperature inversely proportional to the scale factor of the Universe. That is, as the average distances between galaxies increase, the temperature of the cosmic microwave background decreases by the same factor. Therefore, the temperature when the distances between galaxies are 1.7 times as large as they are today will be:

$T'=\frac{T_{now}}{1.73}\\T'=\frac{2.725K}{1.73}\\T'=1.58K$

4 0

3 years ago