Physics, 22.12.2020 23:30 jaimephelps17
A Star is said to be born when ?
a) A red giant collapses on itself and becomes a black hole
b) a protostar reaches a temperature high enough for nuclear fusion to begin
c) pressure within a protostar becomes so great that a supernova occurs
d) a dark, cool interstellar cloud begins to contract
Answers: 1
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Which additional product balances the reaction h2so4 + 2naoh → na2so4 + 2h2o 2oh h2o2 h3o
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The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m^2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute?
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A Star is said to be born when ?
a) A red giant collapses on itself and becomes a black hole
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