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

Physics & Space Science

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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

Physics & Space Science

Telescopes observing in the far ultraviolet can work from high-flying aircraft

Indicate whether the statement is true or false

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science