Answer:
Stars are huge celestial bodies made mostly of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores. Aside from our sun, the dots of light we see in the sky are all light-years from Earth.
Explanation:
Stars are the most widely recognized astronomical objects, and represent the most fundamental building blocks of galaxies. The age, distribution, and composition of the stars in a galaxy trace the history, dynamics, and evolution of that galaxy. Moreover, stars are responsible for the manufacture and distribution of heavy elements such as carbon, nitrogen, and oxygen, and their characteristics are intimately tied to the characteristics of the planetary systems that may coalesce about them. Consequently, the study of the birth, life, and death of stars is central to the field of astronomy.
Stars are born within the clouds of dust and scattered throughout most galaxies. A familiar example of such as a dust cloud is the Orion Nebula. Turbulence deep within these clouds gives rise to knots with sufficient mass that the gas and dust can begin to collapse under its own gravitational attraction. As the cloud collapses, the material at the center begins to heat up. Known as a protostar, it is this hot core at the heart of the collapsing cloud that will one day become a star. Three-dimensional computer models of star formation predict that the spinning clouds of collapsing gas and dust may break up into two or three blobs; this would explain why the majority the stars in the Milky Way are paired or in groups of multiple stars.
Answer:
If the scalar is negative, then multiplying a vector by it changes the vector’s magnitude and gives the new vector the opposite direction. For example, if you multiply by –2, the magnitude doubles but the direction changes. We can summarize these rules in the following way: When vector A is multiplied by a scalar c
Explanation:
Answer:
Halos, blurriness, and night blindness causes night vision (symptoms) while vitamin-A,corrective lenses, such as eyeglasses or contacts, can improve or help night vision.
Explanation:
I bet you will get full Marks if you write it!!
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Answer:
1.48 kg
Explanation:
The conservation of energy states that energy cannot be created or destroyed but can be converted from one form to another. Hence, in this case, energy lost by the copper should equal to the energy gained by the lead. Hence,
Energy Lost by Copper = Energy Gained by Lead
mcT = <em>mcT </em>(Bolded is for copper, italicised is for lead)
m(387)(88.4 - 55.9) = <em>(3.50)(128)(55.9 - 14.4)</em>
12577.5m = <em>18592</em>
<em> </em><u>m = 1.48 kg (3 sf)</u>
<em>(Note: Thermal energy can be calculated using </em><em>Q = mcT</em><em> where </em><em>m</em><em> is the </em><em>mass</em><em>, </em><em>c</em><em> is the </em><em>specific heat capacity</em><em> and </em><em>T</em><em> is the </em><em>change in temperature</em><em>)</em>
Nothing has been discovered to go faster than the speed of light. There have been some discoveries that had a speed very, very close to it (a bit under it), but none have passed it.