Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 12, Problem 48Q
To determine
The reason why neither of the two techniques mentioned below helped astronomers on Earth in detecting the hydrogen present in Jupiter's atmosphere. First technique: detection of the presence of hydrogen in stars by searching for the characteristic absorption lines of hydrogen in the star's visible spectrum. Second technique: detection of hydrogen in glowing gas clouds by searching for hydrogen's characteristic emission lines.
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(a) An asteroid is in an elliptical orbit around a distant star. At its closest approach, the asteroid is 0.640 AU from the star and has a speed of 54.0 km/s. When the asteroid is at its farthest distance from the star of 39.0 AU, what is its speed (in km/s)? (1 AU is the average distance from the Earth to the Sun
and is equal to 1.496 × 1011 m. You may assume that other planets and smaller objects in the star system exert negligible forces on the asteroid.)
(No Response) km/s
(b) What If? A comet is in a highly elliptical orbit around the same star. The comet's greatest distance from the star is 23,300 times larger than its closest distance to the star. The comet's speed at its greatest distance is 2.10 x 10-2 km/s. What is the speed (in km/s) of the comet at its closest approach?
(No Response) km/s
A student holds a spinning bicycle wheel while sitting motionless on a stool that is free to rotate about a vertical axis through its center (see the figure below). The wheel spins with an angular speed of 16.6 rad/s and its initial angular momentum is directed up. The wheel's moment of inertia is 0.170 kg • m²
and the moment of inertia for the student plus stool is 3.50 kg • m².
HINT
Lwheel
Lwheel
(a) Find the student's final angular speed (in rad/s) after he turns the wheel over so that it spins at the same speed but with its angular momentum directed down.
(No Response) rad/s
(b) Will the student's final angular momentum be directed up or down?
○ up
○ down
A war-wolf, or trebuchet, is a device used during the Middle Ages to throw rocks at castles and now sometimes used to fling pumpkins and pianos. A simple trebuchet is shown in the figure below. Model it as a stiff rod of negligible mass 3.00 m long and joining particles of mass m₁ = 0.120 kg and
m2 = 57.0 kg at its ends. It can turn on a frictionless horizontal axle perpendicular to the rod and 11.5 cm from the particle of larger mass. The rod is released from rest in a horizontal orientation. Find the maximum speed that the object of smaller mass attains when it leaves the trebuchet horizontally.
(No Response) m/s
m1
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m2
Chapter 12 Solutions
Universe
Ch. 12 - Prob. 1CCCh. 12 - Prob. 2CCCh. 12 - Prob. 3CCCh. 12 - Prob. 4CCCh. 12 - Prob. 5CCCh. 12 - Prob. 6CCCh. 12 - Prob. 7CCCh. 12 - Prob. 8CCCh. 12 - Prob. 9CCCh. 12 - Prob. 10CC
Ch. 12 - Prob. 11CCCh. 12 - Prob. 1QCh. 12 - Prob. 2QCh. 12 - Prob. 3QCh. 12 - Prob. 4QCh. 12 - Prob. 5QCh. 12 - Prob. 6QCh. 12 - Prob. 7QCh. 12 - Prob. 8QCh. 12 - Prob. 9QCh. 12 - Prob. 10QCh. 12 - Prob. 11QCh. 12 - Prob. 12QCh. 12 - Prob. 13QCh. 12 - Prob. 14QCh. 12 - Prob. 15QCh. 12 - Prob. 16QCh. 12 - Prob. 17QCh. 12 - Prob. 18QCh. 12 - Prob. 19QCh. 12 - Prob. 20QCh. 12 - Prob. 21QCh. 12 - Prob. 22QCh. 12 - Prob. 23QCh. 12 - Prob. 24QCh. 12 - Prob. 25QCh. 12 - Prob. 26QCh. 12 - Prob. 27QCh. 12 - Prob. 28QCh. 12 - Prob. 29QCh. 12 - Prob. 30QCh. 12 - Prob. 31QCh. 12 - Prob. 33QCh. 12 - Prob. 34QCh. 12 - Prob. 35QCh. 12 - Prob. 36QCh. 12 - Prob. 37QCh. 12 - Prob. 38QCh. 12 - Prob. 39QCh. 12 - Prob. 40QCh. 12 - Prob. 41QCh. 12 - Prob. 42QCh. 12 - Prob. 43QCh. 12 - Prob. 44QCh. 12 - Prob. 45QCh. 12 - Prob. 46QCh. 12 - Prob. 47QCh. 12 - Prob. 48QCh. 12 - Prob. 49QCh. 12 - Prob. 50QCh. 12 - Prob. 51QCh. 12 - Prob. 52QCh. 12 - Prob. 53QCh. 12 - Prob. 54QCh. 12 - Prob. 55QCh. 12 - Prob. 56QCh. 12 - Prob. 57QCh. 12 - Prob. 58QCh. 12 - Prob. 59Q
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