The concept of seafloor spreading states that
A) Earth is expanding.
B) seafloor is created at mid-ocean ridges and destroyed at deep ocean trenches.
C) sea level is rising.
D) earthquakes occur underwater.
Answer: B
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In PVC, if the chlorine atoms are all on the same side of the LCM, this is a(n) _____________arrangement.
Fill in the blank(s) with the appropriate word(s).
A uniform rod is 3.0 m long. The rod is pivoted about a horizontal, frictionless pin through one end. The rod is released from rest at an angle of 27° above the horizontal. What is the angular speed of the rod as it passes through the horizontal position?
A. 3.0 rad/s B. 2.8 rad/s C. 2.1 rad/s D. 2.5 rad/s E. 3.4 rad/s
This photo shows gas associated with a protostar. What is this gas doing?
A) It is flowing outward in two opposite directions from the protostar. B) It is gas that is gradually accreting onto the protostar. C) It is part of a protostellar disk in which planets may someday form. D) It is gas blown off the protostar's surface as a protostellar wind.
A Carnot engine operates between reservoirs at 550K and 300K, discarding 1500 J of heat in each cycle. (a) What is the engine's efficiency? (b) How much heat is supplied to the engine by the hot reservoir in each cycle?
What will be an ideal response?