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25 Sep 2019

Out of the following which one is not true for the celestial sphere.

  1. No physically existence.

  2. The stars appear to be located within the celestial sphere.

  3. Earth is centrally localized inside the celestial sphere.

  4. The name by which the celestial sphere is also called the universe.

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Reid Wolff
Reid WolffLv2
12 Jan 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

Which of the statements regarding this situation are true? Selectall that apply.

1-When one charged sphere is placed inside another the net electricfield outside the larger sphere is always larger than the field dueto the larger sphere alone.

2-If there is a positive point charge present at the center, thefield in all regions is either zero or directed away from thecenter.

3-When one charged sphere is placed inside another the net electricfield outside the larger sphere is always non-zero.

4-It is possible to have no electric field inside the outer sphereand a non-zero electric field outside the outer sphere.

5-If the outer sphere is present the electric field between itsinner radius and its outer radius (inside its solid wall, in otherwords) is always zero.

6-It is not possible to have a non-zero electric field inside theinner sphere and outside the outer sphere, but no electric fieldbetween the inner and outer spheres.

7-For a conducting sphere with a net charge Q, the electric fieldinside the sphere is zero and the electric field outside the sphereis the same as the field from a point charge of charge Q placed atthe center of the sphere.

8-As you move steadily out from the origin in this simulation theelectric field changes smoothly. The field can never jump suddenlyfrom one value to another.

9-If the outer sphere is present the way charge is distributed onthe outer sphere depends only on its charge, and not on the chargeof the point charge and the inner sphere.

Astrophysicists in the 1960s tried to explain the existence and thestructure of pulsars – extremely regular astronomical sources ofradio pulses whose periods ranged from seconds to milliseconds. Atone point, these radio sources were given the acronym LGM, standingfor “Little Green Men,” a reference to the idea that they might besignals of extraterrestrial civilizations. The explanation giventoday is no less interesting. Consider the following. Our Sun,which is a fairly typical star, has a mass of 1.99x10^30 kg and aradius of 6.69x10^8 m. Although it does not rotate uniformly,because it isn’t a solid body, its average rate of rotation isabout 1 rev / 25 days. Stars larger than the sun can end theirlives in spectacular explosions called supernovae, leaving behindcollapsed remnants of the stars called neutron stars. Neutron starshave masses comparable to the original masses of the stars, butradii of only a few kilometers. These stars emit beams of radiowaves. Because of the rapid angular speed of the stars, the beamssweep past Earth at regular, very short, intervals. To produce theobserved radio-wave pulses, the star has to rotate at rates fromabout 1 rev/s to 1000 rev/s.

a. Estimate the rotation rate of the Sun if it were to collapseinto a neutron star of radius 10 km. The Sun is not a uniformsphere of gas, and its moment of inertia is given by I = 0.059MR2.Assume that the neutron star is spherical and has a uniform massdistribution.
b. Is the rotational kinetic energy of our Sun greater of smallerafter the collapse? By what factor does it change, and where doesthe energy go to or come from?

Which, if any, of the following statements is/are true?

1)Our galaxy, The Milky Way, is a member of The Local Group, whichis one of several groups of galaxies located in the VirgoSupercluster.
2)Most astrophysicists believe that our Solar System formed from animmense cloud of gas and dust about 4-1/2 million years ago.
3)Planets are believed to have formed by a process known asaccretion.
4)Two key elements in the Condensation Theory of PlanetaryFormation are 5)Conservation of Angular Momentum and CondensationNuclei.
6)The name of the second largest object in the Universe is TheSouthern Wall.
7)In our Solar System, the four jovian planets, Jupiter, Saturn,Uranus, and Neptune, are separated from the four terrestrialplanets, Mercury, Venus, Earth, and Mars, by the Kuiper Belt.
8)Our star, The Sun, is located on the Orion Arm, about 26,000light-years from the center of the Andromeda Galaxy.
9)It takes a photon of light about 4-1/5 years to travel from ourSolar System to the second closest star to Earth, ProximaCentauri.
10)The full range of human knowledge about our Universe spans about40 or 41 orders of magnitude on a spatial scale and about 13.7billion years on a temporal scale.
11)It takes a photon of light about 5-1/2 hours to travel from theSun to the orbit of the former planet Pluto.

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