Why do the jovian planet interiors differ?
A) Accretion took longer further from the Sun, so the more distant planets formed their cores later and captured less gas from the solar nebula than the closer jovian planets.
B) They differ due to giant impacts at the late stages of planet formation.
C) The more distant planets had longer to form than the closer planets, since the solar nebula lasted longer at greater distances from the Sun.
D) The more distant planets formed in a cooler region of the solar nebula and therefore contain a greater proportion of ices than the closer jovian planets.
A
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AC Generator: An ac generator consisting of a coil with N turns rotating at angular speed ? in an external magnetic field B produces a maximum emf ?0.If you now decrease the number of turns in the coil to N/2 and at the same time cause it to rotate twice as fast, what will be the new maximum emf if you do not change any of the other quantities?
A. 4?0 B. 2?0 C. ?0 D. ?0/2 E. ?0/4
A rod of length L is pivoted about its left end and has a force F applied perpendicular to the other end. The force F is now removed and another force F¢ is applied at the midpoint of the rod. If F¢ is at an angle of 30o with respect to the rod, what is its magnitude if the resulting torque is the same as when F was applied?
a. F c. 3F b. 2F d. 4F
In the very first phase after the big bang, when the Universe was about a microsecond old, space was filled with____
a. high-energy photons b. protons and antiprotons c. protons, neutrons, electrons, and positrons (anti-electrons) d. electrons, and positrons (anti-electrons) e. protons, neutrons, electrons
Planetary systems discovered around other stars
A) all have exactly the same layout as the planets in our own solar system B) all have completely different layouts as the planets in our own solar system C) exhibit a range of different layouts, some being very similar to our solar system while others being very different D) all have very similar but not identical layout to our solar system