____________ occurs at a temperature of approximately 1100 degrees F, causing all fuels within an area to simultaneously ignite
a. A backdraft
b. Pyrolysis
c. a flashover
d. Combustion
Ans: c. a flashover
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If a diatomic quantum mechanical vibrator in its ground state has energy E, what is its energy in its second state above the ground state?
A) 3E. B) 7E. C) E. D) 9E. E) 5E.
Two loops of wire are arranged so that a changing current in one, the primary, will induce a current in the other, the secondary. The secondary loop has twice as many turns as the primary loop. As long as the current in the primary is steady at 3.0 A, the current in the secondary will be
a. 3.0 A. b. 6.0 A. c. 1.5 A. d. zero.
Regarding the Earth and a cloud layer 800 m above the Earth as the "plates" of a capacitor, calculate the capacitance if the cloud layer has an area of 1.0 km2 . If an electric field of 2.0 × 10^6 N/C makes the air break down and conduct electricity (lightning), what is the maximum charge the cloud can hold?
A spaceship visits Alpha Centauri and returns to Earth. Alpha Centauri is 4.5 light-years from Earth (our second closest star)
If the spaceship travels at one-half the speed of light for essentially all of its expedition, how long was the ship gone according to an observer on the spaceship?