Why does a hot dog pant?
What will be an ideal response?
Answer: Dogs lack sweat glands and must cool by other means. A dog pants to cool itself by evaporation of moisture in its mouth and bronchial tract.
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The key to finding quasars' distances was
A) planetary nebula in M51. B) globular clusters in the halo of M87 in Virgo. C) a Type I supernova in the spiral arm of 3C87. D) the luminosity of 3C52 from the Doppler shift and the Fisher-Tully relation. E) the huge redshifts of the hydrogen lines in 3C273.
We can measure the radii of stars in eclipsing binary systems
Indicate whether the statement is true or false
The first attempt to map the Galaxy via star counts was done by:
A) Galileo in 1612. B) William Herschel in the late eighteenth century. C) Edward Barnard with long exposure photos about 1900. D) Harlow Shapley with the RR Lyrae variables in 1920. E) Edwin Hubble with the new 100" Mt. Wilson telescope in the 1930s.
A cable with known tension force T is anchored at C and passes over a frictionless drum (see figure). The pin force components Bx and By (in terms of cable force variable T) for the pin connection at B are:
(A) 2T, 2T
(B) 22T, T
(C) 2T, 2T
(D) 2T, 3T/2
