Airplane lift is achieved when air pressure on the bottom of its wings is
A) greater than pressure on top.
B) less than pressure on top.
C) the same as pressure on top.
Answer: A
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If a fish looks upward at 45° to a pond's water's surface, it will see
A) the pond's bottom. B) the sky and possibly some tall surroundings. C) only the water's surface. D) none of the above
If all the components of a vector are equal to 1, then that vector is a unit vector
A) True B) False
Two traveling waves have the forms z1 = A sin(kx - ?t), z2 = A sin(kx + ?t ) Express their superposition in the form of a standing wave
A) 2A cos(kx) cos( ?t ) B) 2A sin(kx) cos( ?t ) C) 2A sin(kx) sin( ?t ) D) A sin[(kx )2 - (?t )2] E) 2A cos(kx) sin( ?t )
A runner generates 1260 W of thermal energy. If this energy has to be removed only by evaporation, how much water does this runner lose in 15 minutes of running? The latent heat of vaporization of water is 22.6 × 105 J/kg
A) 50 g B) 500 g C) 35 g D) 350 g E) 40 g