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Nastasia [14]
3 years ago
9

True or False: During the spring and fall equinoxes, the circle of illumination lights up the Earth exactly even, allowing for e

xactly 12 hours of day and 12 hours of night everywhere on Earth.
Physics
1 answer:
AnnZ [28]3 years ago
4 0

Answer:

True

Explanation:

In the spring and fall equinoxes the north and south poles are at the same distance from the Sun. Therefore, the star rises exactly in the east and sets exactly in the west, allowing for exactly 12 hours of day and 12 hours of night everywhere on Earth.

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an empty bottle has a mass of 24,25 grams and 86,55 grams completely full-filled with water. Then, water in the bottle is emptie
ladessa [460]
The density of a substance is the quotient we obtain when we divide its mass by the volume. The density is,
                          density = mass / volume
The mass of carbon tetrachloride is given to be 123.95 grams and that the volume is obtained by subtracting final weight of the completely full-filled with water bottle with the initial weight.
                              86.55 - 24.25 = 62.3 grams
Since the density of water is 1 grams/ cc. Then, the volume of the bottle is also 62.3 cc. The density is therefore,
                       density = 123.95 grams/ 62.3 cc = 1.99 g/cc
4 0
3 years ago
When the time of day for a certain ship at sea is 12 noon, the time of day at the prime meridian (0 longitude0 is 5 pm. what is
azamat

A).  The sun is highest in London, but will not pass the ship
for another 5 hours.

Since the sun moves from east to west, the ship must be
5 hours west of Greenwich.

Each hour of sun motion is 15° of longitude. 
The ship's longitude is (5 x 15°) = 75° West. 

The ship may be sailing down Columbia Boulevard
in Maple Shade, New Jersey.


B).  The latitude at Buffalo's City Hall is 42.887° North.

Polaris is always within about 2/3 of a degree of that angle
above the northern horizon, when viewed from City Hall.

Choice  2)  is the most appropriate.

4 0
4 years ago
There are two types of waves, mechanical and electromagnetic. Microwaves, infrared, and radio was are examples of electromagneti
aivan3 [116]

Answer:

The answer is D.

Explanation:

One explanation I can give you is that generally waves travel faster through denser medium because the particles are tightly packed together and so they can transfer energy faster. But to verify the answer, I used Process of Elimination because the other 3 answers are not true. Choice A is entirely true, wave speed depends on the medium it is travelling through, so there is no way choice A is correct. Choice B is wrong because for example if we take light(an EM wave), it travels at a constant speed of 3.0x10^8 m/s in a vacuum and in open space. So, that proves that air or vacuum do not affect the speed of the wave in another medium. Choice C is related to Choice B, we just proved the speed of light is constant everywhere whereas choice C says that in a vacuum the speed is halved. Good luck in your Physics class and I hope for your best!

5 0
3 years ago
One star has a temperature of 30,000 K and another star has a temperature of 6,000 K. Compared to the cooler star, how much more
Lilit [14]

Answer:

<em>The hotter star radiates 625 times more energy per second from each square meter of its surface</em>

<em></em>

<em></em>

Explanation:

Temperature of the hotter star is 30000 K

temperature of the cooler star = 6000 K

From Stefan-Boltzmann radiation laws, for a non black body

P = εσAT^{4}

where

P is the energy per second or power of radiation

ε is the emissivity of the body

σ is the Stefan-Boltzmann constant of proportionality

A is the area of the sun

T is the temperature of the sun

The sun can be approximated as a black body, and the equation reduces to

P = σAT^{4}

For the hotter body,

P = σA(30000^{4}) = 8.1 x 10^17σA  J/s

For the cooler body,

P = σA(6000^{4}) = 1.296 x 10^15σA   J/s

comparing the two stars energy

==> (8.1 x 10^17)/(1.296 x 10^15) = 625

<em>This means that the hotter star radiates 625 times more energy per second from each square meter of its surface</em>

<em></em>

5 0
3 years ago
3. The atmospheres of Mars and Venus are mostly carbon dioxide. Earth'satmosphere contains only a fraction of a percent of carbo
maria [59]

Answer:

Earth's atmosphere is a mixture of nitrogen (79%), oxygen (20%), and a small fraction of carbon dioxide, water vapours and other gases. However, the atmospheres on Venus and Mars mainly consist of carbon dioxide.

Explanation:

3 0
3 years ago
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