We can describe the position of an object in our local sky by stating its
A) altitude and meridian.
B) altitude and direction.
C) latitude and direction.
D) latitude and longitude.
E) meridian and longitude.
B) altitude and direction.
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A steel bracket ABCD (EI 5 4.2 3 106 N?m2), with span length L 5 4.5 m and dimension a 5 2 m, is subjected to load P 5 10 kN at D. The maximum deflection at B is approximately:
(A) 10 mm
(B) 14 mm
(C) 19 mm
(D) 24 mm
Imagine that it turns out that dark matter (not dark energy) is made up of an unstable form of matter that decays into photons or other forms of energy about 50 billion years from now
Based on current understanding, how would that affect the universe at that time? A) Stars would cease to exist when the dark matter is gone. B) Planetary systems would expand and disperse. C) The galaxies in clusters would begin to fly apart. D) The universe would cease its expansion.
Compound Microscope: A simple compound microscope normally uses
A. a short focal length objective and a shorter focal length eyepiece. B. a short focal length objective and a longer focal length eyepiece. C. a long focal length objective and a shorter focal length eyepiece. D. a very long focal length objective and a longer focal length eyepiece.
The planet Mars reaches its closest point to the Earth approximately every
A) 26 months B) 12 months C) 6 months D) 36 months