If photosynthesis were to disappear on Earth,
a. the atmosphere would become less dense.
b. oxygen would disappear from the atmosphere.
c. the atmosphere would become hotter.
d. nitrogen would disappear from the atmosphere.
e. the amount of water vapor in the atmosphere would decrease.
b. oxygen would disappear from the atmosphere.
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In the context of helium fusion, if the core of a post-main-sequence star has no nuclear reactions, the star is a__________
A) red giant B) green giant C) gray giant D) yellow giant
Angular distance from the horizon to the south celestial pole always equals your latitude
a. True b. False Indicate whether the statement is true or false
What is the mass of a string that is 17 cm long and has a fundamental frequency of 792 Hz when under a tension of 1.7 kN?
A. 64 g B. 16 g C. 1.6 g D. 32 g E. 6.4 g F. 3.2 g
At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75-g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?
A. 16 m/s B. 45 m/s C. 23 m/s D. 20 m/s E. 36 m/s