Applications to Astronomy: The sun has apparent brightness B at the earth, which is 1.5 × 108 km away. What would be the apparent brightness of the sun at Pluto, which is 6.0 × 109 km from the sun?
A. 0.25 B
B. 0.063 B
C. 0.025 B
D. 0.00063 B
Answer: D
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Explain why Uranus experiences extreme seasons
What will be an ideal response?
Pulling out of a dive, the pilot of an airplane guides his plane into a vertical circle. At the bottom of the dive, the speed of the airplane is 320 m/s
What is the smallest radius allowable for the vertical circle if the pilot's apparent weight is not to exceed 7.0 times his true weight? A) 2200 m B) 1700 m C) 42 m D) 1500 m E) 230 m
A monel shell (Em 5 170 GPa, d3 5 12 mm, d2 5 8 mm) encloses a brass core (Eb 5 96 GPa, d1 5 6 mm). Initially, both shell and core are a length of 100 mm. A load P is applied to both shell and core through a cap plate. The load P required to compress both shell and core by 0.10 mm is approximately:
(A) 10.2 kN
(B) 13.4 kN
(C) 18.5 kN
(D) 21.0 kN
Which is correct?
A.) 24 different kinds of quarks. B.) 12 kinds of quarks and the corresponding 12 kinds of antiquarks. C.) 24 kinds of antileptons. D.) 6 kinds of quarks and the corresponding 6 antiquarks, and 6 kinds of leptons and their 6 corresponding antileptons. E.) 3 quarks and the corresponding 3 antiquarks, 3 leptons and the corresponding 3 antileptons, and 12 other antileptons.