What is the fundamental reason that Mars, unlike Earth, has become virtually geologically dead?
A) its small size compared to Earth
B) its large size compared to Earth
C) its farther distance than Earth to the Sun
D) its closer distance than Earth to the Sun
E) its rapid rotation compared to Earth
F) its slow rotation compared to Earth
A
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The leading hemisphere of Iapetus is much darker than the back side, which is icy
Indicate whether the statement is true or false
A steel bracket ABC (EI 5 4.2 3 106 N # m2) with span length L 5 4.5 m and height H 5 2 m is subjected to load P 5 15 kN at C. The maximum horizontal displacement of joint C is approximately:
(A) 22 mm
(B) 31 mm
(C) 38 mm
(D) 40 mm
Which of the beams is due to a high energy electron?
A) a B) b C) c D) all of the above E) none of the above
At what speed would a clock be moving so that time dilation would cause it to run slow by 50%?
A. 0.500 c B. 0.750 c C. 0.250 c D. 0.414 c E. 0.866 c