One of the biggest problems for ground-based astronomy today is
A. atmospheric pollution has significantly worsened the seeing.
B. light pollution makes it difficult to observe faint objects.
C. all the best mountains already have telescopes on them.
D. space-based observatories are making most of the observations.
Answer: B
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Mercury is heated from 100ºF to vapor at 800ºF. Assume hnfg is 122 Btu/lbm at 676ºF and use a cP of 0.032 Btu/lbm ·ºF for liquid mercury and 0.015 for the vapor. Determine the enthalpy change per unit mass and the heat per unit mass.
What will be an ideal response?
When the perpendicular distance from a linear charge distribution is tripled, what happens to the electric field strength?
A. it stays the same B. it decreases by a factor of 3 C. it decreases by a factor of 9 D. it decreases by a factor of (3)1/2 E. it increases by a factor of (3)1/2
Arriving at a conclusion based upon one's observations is known as:
a. inductive reasoning b. deductive reasoning c. critical thinking d. logic e. the scientific method
A constant net force on a rail-road car produces constant
A) velocity. B) acceleration. C) both of these D) neither of these