Stepping barefoot off a rug onto a hardwood floor makes your feet feel cold. Why?
a. The hardwood floor is at a lower temperature than the rug.
b. The hardwood floor is at a lower temperature than your feet.
c. The hardwood floor conducts heat away from your feet better than the rug.
d. all of the above
B, C
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Applications to Astronomy: Pulsars are rapidly spinning
A. regular stars like our sun. B. red giant stars. C. neutron stars. D. white dwarfs.
When galaxies collide, the large-scale galactic structure is affected, but most of the individual stars are not
Indicate whether the statement is true or false
Which one of the following is TRUE?
A. Irregular galaxies rarely have star formation taking place in them. B. Most galaxies appear to be approaching the Milky Way Galaxy. C. Most elliptical galaxies contain only young stars. D. Smaller galaxies called dwarf galaxies tend to be found around larger galaxies like the Milky Way. E. Galaxy collisions destroy most of the stars in the galaxies involved.
A galvanometer has an internal resistance of 100 ? and deflects full-scale at a current of 2.00 mA
What size resistor should be added to it to convert it to a millivoltmeter capable of reading up to 400 mV, and how should this resistor be connected to the galvanometer? A) 50.0 ? in series with the galvanometer B) 50.0 ? in parallel with the galvanometer C) 75.0 ? in parallel with the galvanometer D) 100 ? in series with the galvanometer E) 100 ? in parallel with the galvanometer