What is oblateness, and what does it tell us about Jupiter's interior?
What will be an ideal response?
Oblateness is the degree to which the planet's rotation causes its equator to bulge and poles to flatten. In Jupiter's case, it is more round than it would be, spinning as rapidly as it does, if it were made only of hydrogen and helium gas; it must have a more solid rocky core deep underneath the fluid clouds.
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For the 7075-T6 alloy in Figure 11.23, the probability of surviving 106 cycles with a stress amplitude of 210 MPa is equal to
(a) 99 % (b) 90 % (c) 50 % (d) 10 %
Astronomers think the Milky Way has spiral arms because
A. they can see them unwinding along the celestial equator. B. Pop II stars, hot molecular clouds, and asterisms outline spiral arms. C. globular clusters outline spiral arms. D. radio maps show that gas clouds are distributed in the disk with a spiral pattern. E. All of these choices are correct.
A 3rd magnitude star is 3 times brighter than a 1st magnitude star
a. True b. False Indicate whether the statement is true or false
What is the primary difference between an ideal emf device and a real emf device?
a) The electric potential of a real emf device is limited. b) The resistance of a real emf device is finite, but the resistance of an ideal emf device is assumed to be infinite. c) A real emf device can carry an electric current, but an ideal emf device does not. d) A real emf device has an internal resistance, but an ideal emf device does not.