Heisenberg's Uncertainty Principle states that
A) all measurements are to some extent inaccurate, no matter how good the instrument used.
B) we cannot in principle know simultaneously the position and momentum of a particle with absolute certainty.
C) we can never be sure whether a particle is a wave or a particle.
D) at times an electron appears to be a particle and at other times it appears to be a photon.
E) the charge on the electron can never be known with absolute accuracy.
B
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Rotation causes the cocoon of dust to flatten into a dusty disk around protostars
Indicate whether the statement is true or false
How long ago did the CasA supernova occur?
A.) 100 years ago. B.) 340 years ago. C.) 1,600 years ago. D.) 34 million years ago. E.) 1.6 billion years ago.
When a star's inward gravity and outward pressure are balanced, the star is said to be
A) in hydrostatic equilibrium. B) in gravitational collapse. C) a stage 2 protostar. D) in thermal expansion. E) in rotational equilibrium.
Heat has the same units as:
A. temperature B. work C. energy/time D. heat capacity E. energy/volume