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2 years ago

Precise measurements of earth indicate that its polar diameter is

Physics

1 answer:

Hatshy [7]2 years ago

3 0

Answer:

12713.6 km (7899.86 mi)

Explanation:

The polar diameter of Earth is slightly shorter that the equitorial diameter of the earth. The polar diameter to be precise is 12713.6 km (7899.86 mi), whereas the equitorial diameter is about 12756 Km (7926 mi). This mean that objects located along the equator are about 21 km further away from centwe of the Earth than objects located on the poles.

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In stars mor massive than the sun, fusion continues until the core is almost all....

serious [3.7K]

In stars more massive than the sun, the core temperature is hotter, which allows for fusion of more complex elements.

Most of the fusion occurs in the core.

In stars more massive than the sun, fusion continues through Deuterium, Carbon, and finally reaching iron/nickel.

Up to this point, the fusion reaction was endothermic, which means that the energy expended to produce the fusion reaction was exceeded by the energy produced in the reaction.

Fusion past iron is exothermic, and therefore the star will be able to survive by fusing elements heavier than iron.

After the core is almost entirely iron, the star is no longer in the Main Sequence.

So, fusion in stars more massive than the sun continue fusing until the core is almost entirely <em>iron</em>.

3 0

3 years ago

VERY EASY QUESTION!!!!!! 20 POINTS!!!!!!!!

slamgirl [31]

C. at a science fair

4 0

2 years ago

Read 2 more answers

The above graph shows the speed of a car over time. During which time period was the car stopped?

rjkz [21]

The answer is C, as there is not increase or decrease in speed during that time frame.

8 0

3 years ago

In a Young's double-slit experiment, light of wavelength 500 nm illuminates two slits which are separated by 1 mm. The separatio

Keith_Richards [23]

Answer:

b. 0.25cm

Explanation:

You can solve this question by using the formula for the position of the fringes:

$y=\frac{m\lambda D}{d}$

m: order of the fringes

lambda: wavelength 500nm

D: distance to the screen 5 m

d: separation of the slits 1mm=1*10^{-3}m

With the formula you can calculate the separation of two adjacent slits:

$\Delta y=\frac{(m+1)(\lambda D)}{d}-\frac{m\lambda D }{d}=\frac{\lambda D}{d}\\\\\Delta y=\frac{(500*10^{-9}nm)(5m)}{1*10^{-3}m}=2.5*10^{-3}m=0.25cm$

hence, the aswer is 0.25cm

5 0

3 years ago

From the top of a cliff, a person uses a slingshot to fire a pebble straight downward, which is the negative direction. The init

Talja [164]

Answer:

$\vec{a} = -(9.8~{\rm m/s^2})\^y$

Explanation:

Regardless of the initial velocity of the pebble, the acceleration of the pebble is equal to the gravitational acceleration which is equal to 9.8 m/s2 towards downwards direction.

This can be shown by Newton's Second Law. According to the law, the net force applied on an object is equal to mass times acceleration of that object.

During the downward motion, the only force acting on the pebble is the gravitational force, hence its acceleration is equal to gravitational acceleration.

8 0

3 years ago