Which of the following observations indicates that conditions on Mars may have been suitable for life in the past?
A) Mars has polar caps made of "dry ice."
B) There are dried-up riverbeds on Mars.
C) Mars has two small moons.
D) There are very large extinct volcanoes on Mars.
E) There is a very deep and long canyon that extends across Mars.
B
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A copper specimen is stressed in tension to 76×106 Pa and a total strain of 0.01; then the specimen is unloaded. We observe after the test that the deformation was uniform. Determine the expected recovered elastic strain and the permanent plastic strain.
What will be an ideal response?
Earth's core is hot, dense, and mostly composed of iron and nickel
a. True b. False Indicate whether the statement is true or false
For general projectile motion, which statement is true when the projectile is at the highest point of its trajectory?
A) Its acceleration is zero. B) Its velocity is perpendicular to the acceleration. C) Its velocity and acceleration are both zero. D) The horizontal component of its velocity is zero. E) The horizontal and vertical components of its velocity are zero.
_____ is the conflict between theory and evidence regarding the darkness of the night sky
A) Grandfather's paradox B) Socratic paradox C) Bentley's paradox D) Olbers's paradox