What did Carl Sagan mean when he said that we are all "star stuff"?
A) that life would be impossible without energy from the Sun
B) that the Earth formed at the same time as the Sun
C) that the carbon, oxygen, and other elements essential to life were created by fusion in stellar cores
D) that the Sun formed from the interstellar medium: the "stuff" between the stars
E) that the universe contains billions of stars
C) that the carbon, oxygen, and other elements essential to life were created by fusion in stellar cores
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The thermal expansion of a solid is caused by
a. the breaking of bonds between atoms. b. increasing the amplitude of the atoms vibration. c. increasing the distance between equilibrium positions for the vibrating atoms. d. all of the above.
As rock is weathered it breaks down and erodes. Sedimentation begins where erosion stops. Erosion is
A) disintegration and fragmentation of rock into smaller pieces. B) a chemical process. C) decomposition and alteration of rock material. D) transportation of rock particles via water wind or ice.
The difference in blood pressure between the head and the foot of a person who is 2.000 m tall and resting on an incline that is at an angle of 30.00 degrees to the horizontal is (density of blood is 1,060
A. 59.80 mmHg. B. 62.77 mmHg. C. 68.55 mmHg. D. 70.22 mmHg. E. 77.94 mmHg.
Two satellites with equal rest masses of 100 kg are traveling toward each other in deep space. One is traveling at 0.650c and the other at 0.850c. The satellites collide and stick together
What is the rest mass of the combined object after the collision? A) 100 kg B) 200 kg C) 277 kg D) 378 kg E) 312 kg