Electrons are collected by removing them from the atoms in a sample of water vapor (H2O, molecular mass 18u). If every hydrogen atom has lost an electron in the process, what is the mass of the sample if a charge of exactly 1.0C was collected?
A. 62 ?g
B. 370 ?g
C. 93 ?g
D. 180 ?g
C. 93 ?g
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Why do astronomers believe supermassive black holes are the source of an AGN's energy?
a. Such black holes have been found at the center of most galaxies both active and inactive. b. Radio jets are seen from low mass black holes plus accretion disks inside our galaxy. c. jets and accretion disks have been observed in active galaxies d. black holes can produce so much energy in such a small place. e. all of the above
Phase changes occur with an attendant
A) convection. B) temperature decrease. C) temperature remaining constant. D) temperature increase.
Instructions: On occasion, the notation 
will be a shorthand notation for 
.
When vector 
is added to vector 
, which has a magnitude of 5.0, the vector representing their sum is perpendicular to and has a magnitude that is twice that of . What is the magnitude of ?
A. 2.2
B. 2.5
C. 4.5
D. 5.0
E. 7.0
In an isovolumetric process
a. the temperature remains constant. b. no heat is transferred between a system and its surroundings. c. the pressure remains constant. d. the volume remains constant. e. the internal energy is constant.