The H-R diagram of a young star cluster shows
a. that high-mass stars have not yet reached the main sequence yet.
b. that low-mass stars have not yet reached the main sequence yet.
c. mainly giant stars.
d. no stars since none have reached the main sequence yet.
b
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Which one of the following conditions is not a requirement for a particle to experience a magnetic force when placed in a magnetic field?
a) The particle must be moving. b) The particle must be charged. c) The particle must not be under the influence of any other forces. d) The velocity of the particle must have a component that is perpendicular to the direction of the magnetic field.
If the energy levels in the neon atom were not discrete, neon signs would glow
A) red. B) white. C) blue.
The formula mass of acetic acid, HC2H3O2, is ______________ u
Fill in the blank(s) with correct word
Power is
a. the time rate of doing work. b. the time rate of doing velocity. c. the time rate of doing momentum. d. the time rate of doing force.