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3 years ago

Astronomers believe that the universe began as an enclosed, cold object. true or false?

Physics

2 answers:

Margarita [4]3 years ago

6 0

Answer: False

Explanation:

Astronomers believe that the universe began as a point (singularity) where all the matter of the universe was enclosed. The point had infinite density and extremely high temperature. The universe started expanding at t =0 when big bang occurred. With the expansion of the universe, the temperature started reducing. Detection of Cosmic Microwave Background Radiation is in agreement with this theory.

Thus, the given statement is false.

zhannawk [14.2K]3 years ago

4 0

<span>Scientists believe that the earliest state of the universe was hot and dense. So I think this is false.</span>

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Because you’re using electricity

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4 years ago

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3 years ago

A tabletop gamer has designed a game that requires three dice to be thrown onto a tray with a measurement grid. To add an extra

Airida [17]

Answer:

The resulting coordinate is $(x,y) = (-0.170 \ m , -0.038 \ m )$

Explanation:

From the question we are told that

The mass of the first dice is $m_1 = 11.10 \ g$

The mass of the second dice is $m_2 = 15.10 \ g$

The mass of the third dice is $m_3 = 18.90 \ g$

The coordinate of the first dice is $(x_1, y_1) = (0.3150\ m , -0.4990 \ m )$

The coordinate of the second dice is $(x_2,y_2) = (-0.4050 \ m , 0.4850 \ m )$

The coordinate of the third dice is $(x_3 , y_3) = (-0.1150 \ m , -0.1850\ m )$

Generally the resulting coordinate of the center of mass of the dice in the x-axis is mathematically evaluated as

$x\ cm = \frac{m_1 * x_1 + m_2 * x_2 + m_3 * x_3}{m_1 + m_2 +m_3 }$

i.e the summation of the moments about their x-axis divided by the magnitude of their masses

substituting values

$x\ cm = \frac{11.0 * 0.3150 + 15.10 * (-0.4050) + 18.90 * (-0.1150)}{11.100 + 15.10 +18.90 }$

$x\ cm = -0.170 \ m$

Generally the resulting coordinate of the center of mass of the dice in the y-axis is mathematically evaluated as

$y\ cm = \frac{m_1 * y_1 + m_2 * y_2 + m_3 * y_3}{m_1 + m_2 +m_3 }$

$y\ cm = \frac{ 11.10 * (-0.4990) + (15.10) * (0.4850) + (18.90) * (-0.1850)}{ 11.10 + 15.10 +18.90 }$

$y\ cm = -0.038 \ m$

Thus the resulting coordinate is $(x,y) = (-0.170 \ m , -0.038 \ m )$

4 0

3 years ago

A cave diver enters a long underwater tunnel. When her displacement with respect to the entry point is 20 m, she accidentally dr

Sladkaya [172]

Answer:

displacement vector is -16i

Explanation:

Given data:

Displacement relative to entry of tunnel is 20 m

Distance from entry of tunnel at which she notice about camera missing is 6 m

swim distance is 10 m

total distance from entry of tunnel after she swin back is 20+ 6 = 26 m

After covering 10 m to find a camera she will be at 26 -10 = 16 m

If direction out from tunnel is taken as positive then her displacement vector with respect to entry of tunnel is - 16i

where i is unit positive vector.

7 0

3 years ago

How long must a pendulum be to have a period of 4.6 5 on Neptune, where g = 11.15 m/s?

Anon25 [30]

Answer:

5.98 m

Explanation:

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

$T^2=4\pi ^2L/g\\L = gT^2/(4\pi^2)$ = 11.15*4.6²/(4π²) = 5.98 m

5 0

2 years ago