The New Orleans levees failed because
A. thermal expansion broke them
B. they were made of continuous concrete that could not stand the pressure
C. they had leaks at the thermal expansion joints
D. they were weaker at the thermal expansion joints
Answer: D. they were weaker at the thermal expansion joints
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When supermassive black holes have access to "fuel" what are they?
A) Planetary nebulae. B) Gamma-ray bursts (GRBs). C) They get pulled apart by tidal forces. D) Type III Supernovae. E) Quasars and active galactic nuclei (AGNs).
If each nuclear fission reaction in a nuclear power plant releases 
, what quantity of Uranium-235 must be consumed each day to keep a 350MW plant producing at capacity? Assume the power plant is 35% efficient.
A. 5.2kg B. 1.8kg C. 0.43kg D. 1.2kg
A 2.00-kg object moves with constant velocity 3.00 m/s toward the east. Two forces act on the object. The first is a 40.0 N force toward the west. What is the second force that acts on the object?
A) 23.0 N east B) 40.0 N east C) 26.7 N east D) 46.0 N east E) 46.0 N west
Which of the following conditions is never a boundary condition in fluid mechanics?
(A) The velocity is zero at a boundary (B) The normal component of velocity is zero in an inviscid flow at a boundary (C) The tangential component of velocity is zero in an inviscid flow at a boundary (D) The pressure is zero at a boundary