The planet Mercury
a. has retrograde motion.
b. is the closest planet to Venus.
c. is the smallest of the terrestrial planets.
d. has a uniquely circular orbit.
c
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Ball bearings of 20% nickel steel, 10 cm spherical diameter, at 200ºC are quenched in 20ºC oil where the convective heat transfer coefficient is 200 W/m^2K. Determine a) the time for the surface to reach 80ºC, and b) the thermal energy exchanged during this time.
What will be an ideal response?
A turntable was revolving at 33 1/3 rpm. It was shut off and uniformly slowed down and stopped in 5.5 seconds
(a) What was the angular acceleration? (b) Through how many revolutions did it turn?
What observed feature of the Milky Way is better explained by the bottom-up hypothesis of galactic formation, as opposed to the monolithic collapse model?
a. The elongated shape of the central bulge of the galaxy b. The different metallicities of the bulge and disk of the galaxy c. The difference in age of globular clusters d. The supermassive black hole found at center of the galaxy e. The very little gas or dust that halo contains
What range of electromagnetic radiation is emitted when transitions from higher levels into n = 1 occur in a hydrogen atom?
A) Visible B) Infrared C) Microwave D) X-Ray E) Ultraviolet