Which of the following is not a real difference between asteroids and comets?
A) Asteroids orbit the Sun while comets just float randomly around in the Oort cloud.
B) Most asteroids are located much nearer to the Sun than most comets.
C) It is thought that comets are far more numerous than asteroids.
D) Asteroids are made mostly of rock and comets are made mostly of ice.
A
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Beam ACB has a sliding support at A and is supported at C by a pinned-end steel column with square cross section (E 5 200 GPa, b 5 40 mm) and height L 5 3.75 m. The column must resist a load Q at B with a factor of safety of 2.0 with respect to the critical load. The max-imum permissible value of Q is approximately:
(A) 10.5 kN
(B) 11.8 kN
(C) 13.2 kN
(D) 15.0 kN
A certain CD-ROM disk can store approximately 6.0 × 102 megabytes of information, where 106 bytes = 1 megabyte. If an average word requires 9.0 bytes of storage, how many words can be stored on one disk?
A) 6.7 × 107 words B) 5.4 × 109 words C) 2.1 × 107 words D) 2.0 × 109 words
Plutonium has a half life of 2.4 × 104 years. How long does it take for 99% of the plutonium to decay?
A) 1.6 × 106 y B) 1.6 × 105 y C) 1.6 × 104 y D) 1.6 × 103 y E) 1.6 × 102 y
When water vapor condenses to liquid water, is thermal energy absorbed or released?
What will be an ideal response?