The Holocene epoch began when
a. the glaciers last retreated from North America.
b. a period of intense volcanic activity ended.
c. an asteroid hit Chicxulub.
d. Pangaea began breaking up.
a
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A bronze rod 1 cm in diameter and 30 cm long protrudes from a bronze surface at 150ºC. The rod us surrounded by air at 10ºC with a convective heat transfer coefficient of 10 W/m^2K. Determine the heat transfer through the rod.
What will be an ideal response?
The source of particles for Jupiter's rings is ________.
A. ice geysers on Enceladus B. collisions between debris and two small moons C. gravitationally captured interplanetary dust D. volcanic eruptions on Io E. material pulled in by Jupiter's magnetic field
The purpose of a voltage source is to provide an electrical
A) energy sink. B) field. C) pressure.
The stimulated emission of photons from the excited atoms in a gas laser is prompted by which of the following?
a. nearby presence of photons of same wavelength as those emitted b. high flux of electrons c. high voltage d. high temperature