A dipole radio transmitter has its rod shaped antenna oriented vertically. At a point due south of the transmitter, the radio waves have their magnetic field
A. oriented in a horizontal direction.
B. oriented east-west.
C. oriented vertically.
D. oriented north-south.
B. oriented east-west.
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Design a heat pipe cooling system for a spherical satellite that dissipates 5000 W/m3 , has a surface area of 5 m2 , and cannot exceed a temperature of 120°C. All the heat must be dissipated by radiation into space. State all your assumptions.
GIVEN
FIND
(a) A design for a heat pipe cooling system
ASSUMPTIONS
? Temperature drop between the satellite interior and the heat pipe evaporator is < 20°C
? Neglect vapor pressure drop in the heat pipe
What is the acceleration of an object in free fall at Earth's surface?
How is it possible for the angular magnification to be large and, at the same time, for the lateral magnification to be small? Give an example
What will be an ideal response?
Fallout from nuclear weapons or from a nuclear reactor accident is due to
A) the uranium nuclei used in the fission reaction. B) the radioactive "fission products" produced during the fission reaction. C) the neutrons produced during the fission reaction. D) chickens flying overhead. E) the radioactive "fusion products" produced during the fusion reaction.