An astronaut in a space suit is motionless in outer space. The propulsion unit strapped to her back ejects some gas with a velocity of 50 m/s. The astronaut recoils with a velocity of 1.0 m/s. If the mass of the astronaut and space suit after the gas is ejected is 120 kg, the mass of the gas ejected is
A. 1.0 kg.
B. 1.9 kg.
C. 2.4 kg.
D. 3.00 kg.
E. 3.6 kg.
C. 2.4 kg.
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The constellation Orion is visible on winter evenings but not on summer evenings because of
A) blockage by the full moon. B) the tilt of Earth's rotation axis. C) the location of Earth in its orbit around the Sun. D) the precession of Earth's rotation axis.
Which of the following characteristics define type?
A. color B. style C. size D. All of the above are used to define type.
Consider the hypothetical discovery from Part A reading: "Beyond its jovian planets, a star has two ice-rich objects as large as Mars." This discovery is consistent with the nebular theory, because this theory predicts that _________.
a. ice-rich objects the size of terrestrial planets should exist in all solar systems b. terrestrial planets sometimes form beyond the jovian planets c. this might have happened in our own solar system if it had taken longer for the solar wind to clear the solar nebula
If the radius of star A is twice the radius of star B, but both have similar temperatures, how do their luminosities compare?
A: Star A is 2 times as luminous as star B. B: Star A is 4 times as luminous as star B. C: All stars have the same luminosities. D: Star A is 4 times less luminous than star B. E: Star A is 2 times less luminous than star B.