Which of the following best describes differentiation in planetary geology?

A) Gravity separates molten materials according to density.
B) Different types of minerals form a conglomerate rock.
C) One planet's surface evolves differently from another planet's surface.
D) One part of a planet's surface evolves differently from another part of the same planet's surface.
E) Dense materials condense at higher temperatures than less dense materials.


A) Gravity separates molten materials according to density.

Physics & Space Science

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If an object is accelerating toward a point, then it must be getting closer and closer to that point

A) True B) False

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Projectile Motion: A 5.0-kg stone is thrown upward at 7.5 m/s at an angle of 51° above the horizontal from the upper edge of a cliff, and it hits the ground 1.5 s later with no air resistance. Find the magnitude of its velocity vector just as it reaches the ground.

Fill in the blank(s) with the appropriate word(s).

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What is the temperature difference across a window if the conductive heat flow rate across it is 20 J/s? The window is 4.5 m2 in area that has an R-value of 2.5 m2 °C/W

What will be an ideal response?

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In addition to 1 m = 39.37 in., the following exact conversion equivalents are given: 1 mile = 5280 ft, 1 ft = 12 in, 1 hour = 60 min, and 1 min = 60 s. If a particle has a velocity of 8.4 miles per hour,its velocity, in m/s, is closest to

A) 3.8 m/s. B) 3.0 m/s. C) 3.4 m/s. D) 4.1 m/s. E) 4.5 m/s.

Physics & Space Science