The actual source of wind energy is
A. the daily rotation of the Earth on its axis.
B. the tides.
C. the lunar cycle.
D. solar energy.
Answer: D
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A horse and rider travel in a region in which the vertical component of the Earth’s magnetic field is 0.035mT, while the horizontal component is 0.022mT. Attached to the horse’s bridle is a metal bit, a cylinder approximately 15cm long, in the horse’s mouth that is oriented horizontally. If the horse is galloping at 15m/s, what is the induced potential difference between the ends of the bit?
A. 79mV B. 93mV C. 50?V D. 93?V E. 50mV F. 79?V
Synchrotron radiation is produced by
a. objects with temperature below 10,000 K. b. high-velocity electrons moving through a magnetic field. c. cold hydrogen atoms in space. d. the collapsing cores of massive stars. e. helium flash.
What is causing the Trifid Nebula to glow?
What will be an ideal response?
Show that the heat transfer for a fin that is square and has fin tip convective heat transfer coefficient hL can be written
