The Permian extinction event was mostly likely caused by
A) widespread volcanic activity in Siberia
B) an asteroid impact
C) the onset of a snowball Earth phase
D) the reversal of the Earth's magnetic field
A
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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 rotation of joint B is approximately:
(A) 0.18
(B) 0.38
(C) 0.68
(D) 0.98
Telescopes observing in the far ultraviolet can work from high-flying aircraft
Indicate whether the statement is true or false
The gravitational force that the Sun exerts on Earth is much larger than the gravitational force that Earth exerts on the Sun
Indicate whether the statement is true or false
Which of the following statements about Kepler's laws is false?
A) Kepler's laws provide mathematical descriptions of the motion of the planets. B) Kepler's first law states that planetary orbits are shaped as ellipses. C) Kepler's second law implies that when planets are closer to the sun, they move faster. D) Kepler's laws explain why planets with larger semi-major axes have much longer orbital periods.