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4 years ago

The term time dilation refers to which effect?

Physics

2 answers:

RoseWind [281]4 years ago

6 0

Is the apparent loss of time of a moving clock as observed by a stationary observer. Thats what i think.

Strike441 [17]4 years ago

6 0

<span>In the theory of relativity, time dilation is a difference of elapsed time between two events as measured by observers either moving relative to each other or differently situated from a gravitational mass or masses.</span>

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What happens when a wave reflects?

solong [7]

They bounce off just like sun rays when they heat the atmosphere they bounce off reflection

4 0

4 years ago

Una tubería con secciones circulares se emplea para el traslado de agua entre el tanque central y un tanque auxiliar. El tanque

charle [14.2K]

A) 20 L/s

B) 2.55 m/s

C) 10.20 m/s

D) 400.8 kPa

Explanation:

In this problem, we know that the volume of the tank:

$V=72 m^3$

is filled in a time of

$t = 1 h$

We also know that the volume flow rate of water in the pipe is constant in every point of the pipe, so it can be calculated directly from the two data above.

The volume of the tank, in liter, is

$V=72 m^3 = 72,000 L$

While the time, in seconds, is

$t=1 h = 3600 s$

Therefore, the volume flow rate in Liters per second is:

$Q=\frac{V}{t}=\frac{72,000}{3600}=20 L/s$

The volume flow rate of water through the pipe can be also written as

$Q=Av$

where

A is the cross-sectional area of the pipe

v is the speed of the water

In section B, we have:

r = 0.050 m is the radius of section B

so, the cross-sectional area of section B is:

$A=\pi r^2 = \pi (0.050)^2=0.00785 m^2$

The volume flow rate in SI units is

$Q=\frac{V}{t}=\frac{72.0m^3}{3600 s}=0.02 m^3/s$

Therefore, the speed of the water in section B is:

$v=\frac{Q}{A}=\frac{0.02}{0.00785}=2.55 m/s$

As in part B), we know that the volume flow rate must remain constant through the entire pipe.

So, the volume flow rate in section A of the pipe is still

$Q=0.02 m^3/s$

The radius of the pipe in section A is

$r=0.025 m$

Therefore, the cross-sectional area in section A of the pipe is

$A=\pi r^2 = \pi (0.025)^2=0.00196 m^2$

So, since we have

$Q=Av$

we can find the speed of water in section A:

$v=\frac{Q}{A}=\frac{0.02}{0.00196}=10.20 m/s$

Here we want to find the gauge pressure in section B.

We know that:

$p_A = 2.0 atm = 105,000 Pa$ is the pressure in section A

$h_A=15.0m$ is the altitude of section A

$v_A=10.20 m/s$ is the speed of water in section A

$v_B=2.55 m/s$ is the speed of water in section B

We can write Bernoulli's equation:

$p_A + \rho g h_A + \frac{1}{2}\rho v_A^2 = p_B + \frac{1}{2}\rho v_B^2$

where

$\rho=1000 kg/m^3$ is the water density

$p_B$ is the pressure in section B

And solving for pB, we find:

$p_B = p_A + \rho g h_A + \frac{1}{2}\rho (v_A^2-v_B^2)=\\=205,000+(1000)(9.8)(15.0)+\frac{1}{2}(1000)(10.20^2-2.55^2)=400,769 Pa$

Which is

$p_B = 400.8 kPa$

5 0

3 years ago

Early mapmakers thought continents might have moved based on their observation of

Elodia [21]

Answer:

C. matching coastlines

Explanation:

The theory of continental drift was originally proposed in 1912 by German meteorologist and geophysicist Alfred Wegener (1880-1930), who formulated it based, among other things, on how they seemed to fit the shapes of the continents on each side of the Atlantic Ocean, such as Africa and South America. This had previously been speculated by some mapmakers.

8 0

3 years ago

Why does the pattern of colors repeat in a thin soap film? Please use 2 content related sentences

alexgriva [62]

Answer:

1) Some light waves bounce off the inner part of the film.

2) In doing so they travel a bit than the waves bouncing off the outer waves.

so we see colors repeat in pattern in a thin soap film

Explanation:

A colorful interference pattern is observed when light is reflected from the top and bottom boundaries of a thin oil film. The different bands form as the film's thickness diminishes from a central runoff-point.

When white light shines on a bubble, strange things happen. When light waves hit a bubble, some of them bounce straight back off the outer part of the soap film. Others carry on through but then bounce off the inner part of the film. So one set of light rays shine into a soap bubble, but two sets of rays come back out again. When they emerge, the waves that bounce off the inner film have traveled a tiny bit further than the waves that bounced off the outer film. So we have two sets of light waves that are now slightly out of step. Like two sets of ripples on a pond, these waves start merging. Just like on a pond, some add together and some cancel out. The overall effect is that some of the colors in the original white light disappear altogether, leaving other colors behind. These are the colors you see in soap bubbles.

5 0

4 years ago

Venus is sometimes called:_____.

ANEK [815]

Venus is sometimes called the evening star.

A star is an astronomical object made up of a luminescent plasma spheroid that is held together by gravity. However, because to their enormous distances from Earth, many additional stars that are visible to the unaided eye at night seem like stationary points of light. The brightest stars have a variety of names, and the most notable ones have been grouped into constellations and asterisms. In order to identify known stars and establish standard stellar designations, astronomers have put together star catalogues. 1022–1024 stars are thought to be present in the observable universe. All individual stars outside of the Milky Way galaxy, for example, are invisible to the human eye from Earth.

To learn more about star, visit:

brainly.com/question/11624159

#SPJ4

6 0

2 years ago