State a testable prediction of the nebular theory that has been confirmed by observations of extrasolar planets. Does this confirmation mean the theory is completely correct?
What will be an ideal response?
Answer: One key prediction of nebular theory is that planets should be common around stars, and this has been borne out by discoveries of extrasolar planets. But this does not mean that all aspects of the theory are correct, as they may be other details that will eventually require modification.
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The pressure relief valve is opened on a thin-walled cylindrical tank, with the radius-to-wall thickness ratio of 128, thereby decreasing the lon-gitudinal strain by 150 3 1026. Assume E 5 73 GPa and ? 5 0.33. The original internal pressure in the tank was approximately:
(A) 370 kPa
(B) 450 kPa
(C) 500 kPa
(D) 590 kPa
A spring is characterized by a spring constant of 60. N/m. How much potential energy does it store, when stretched by 1.0 cm?
A) 600. J B) 6.0 ?J C) 60. J D) 0.3 J E) 0.003 J
Bats can detect small objects such as insects that are of a size on the order of a wavelength. If bats emit a chirp at a frequency of 60 kHz and the speed of soundwaves in air is 330 m/s, what is the smallest size insect they can detect?
A. 1.5 mm B. 3.5 mm C. 5.5 mm D. 7.5 mm E. 9.8 mm
During the T-Tauri phase of a protostar, it
A) begins a period of reduced activity. B) expands dramatically. C) may develop very strong winds. D) lies on the main sequence. E) changes its spin direction.