In Hubble's classification, which type of galaxy has no stellar disk and no gas or dust?

A) E0
B) S0
C) Sa
D) SBc
E) E9


A

Physics & Space Science

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Oxygen in Earth's atmosphere is outgassed in volcanic eruptions

Indicate whether the statement is true or false

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Projectile Motion: A stone is thrown horizontally with an initial speed of 10 m/s from the edge of a cliff. A stopwatch measures the stone's trajectory time from the top of the cliff to the bottom to be 4.3 s. What is the height of the cliff if air resistance is negligibly small?

A. 22 m B. 43 m C. 77 m D. 91 m

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A mountain climber of mass 60. kg slips and falls a distance of 4.0 m, at which time he reaches the end of his elastic safety rope. The rope then stretches an additional 2.0 m before the climber comes to rest

What is the spring constant of the rope, assuming it obeys Hooke's law?

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The number of electrons in a hydrogen atom is ______________

Fill in the blank(s) with correct word

Physics & Space Science