Tidal energy projects have no environmental drawbacks
What will be an ideal response?
There is an aphorism that "you can't do just one thing." This is true for tidal
energy projects as well. There may be many environmental drawbacks that have not yet been
recognized, but there are certainly known drawbacks. The underwater blades will certainly
collide with fish and this would have a direct effect. There are also indirect effects that are
caused by the churning action of the blades..
Discussion Questions
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A planet with a higher reflectivity will do which of the following?
A) reflect more light and absorb less light B) reflect less light and absorb more light C) emit more light D) emit higher energy light E) transmit more light
Two objects, one of mass m and the other of mass 2 m, are dropped from the top of a building. If there is no air resistance, when they hit the ground
A. the heavier one will have twice the kinetic energy of the lighter one. B. both will have the same kinetic energy. C. the heavier one will have half the kinetic energy of the lighter one. D. the heavier one will have four times the kinetic energy of the lighter one. E. the heavier one will have one-fourth the kinetic energy of the lighter one.
If you were in a spaceship in outer space and accelerating at 0.5 g, how heavy would you feel?
A) 1.5 times your normal weight B) Your normal weight C) Weightless D) Half your normal weight E) The answer depends on how fast your spaceship is moving.
Two-Source Interference of Sound: Two stereo speakers mounted 4.52 m apart on a wall emit identical sound waves. You are standing at the opposite wall of the room at a point directly between the two speakers. You walk 2.11 m parallel to the wall, to a location where you first notice that the sound intensity is essentially zero. If the wall along which you are walking is 10.7 m from the wall with the speakers, what is the wavelength of the sound waves? The walls are cushioned to absorb sound reflections.
A. 1.71 m B. 2.05 m C. 2.57 m D. 2.91 m