Why was the separation of the superforce into three forces so important?
What will be an ideal response?
The pressure release created the inflationary epoch, when the universe expanded by 50 orders of magnitude, solving the flatness problem.
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The moment of inertia about the x axis of the parallelogram in Problem 5.3 is:
(A) bh3/3 (B) 2bh3/3 (C) bh3/4 (D) bh3/2
Stars like the Sun probably do not form iron cores during their evolution because
A. the iron they make by nucleosynthesis is all fused into uranium. B. their strong magnetic fields keep their iron in their atmospheres. C. all the iron is ejected when they become planetary nebulas. D. their cores never get hot enough for them to make iron by nucleosynthesis. E. None of these choices is correct.
Vision Problems: A nearsighted person has a far point that is 4.2 m from his eyes. What power contact lenses must he wear to allow him to focus on distant mountains?
A. 0.48 diopters B. -0.48 diopters C. -0.36 diopters D. -0.24 diopters E. 0.24 diopters
Constant Angular Acceleration: In the figure, point P is on the rim of a wheel of radius 2.0 m. At time t = 0, the wheel is at rest, and P is on the x-axis. The wheel undergoes a uniform counterclockwise angular acceleration of 0.010 rad/s2 about the center O.(a) At time t = 0, what is the tangential acceleration of P?(b) What is the linear speed of P when it reaches the y-axis?(c) What is the magnitude of the net linear acceleration of P when it reaches the y-axis?(d) How long after starting does it take for P to return to its original position on the x-axis?
What will be an ideal response?