Astronomy
Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Chapter 27, Problem 14E

One of the early hypotheses to explain the high redshifts of quasars was that these objects had been ejected at very high speeds from other galaxies. This idea was rejected, because no quasars with large blueshifts have been found. Explain why we would expect to see quasars with both blueshifted and redshifted lines if they were ejected from nearby galaxies.

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An object is subjected to a friction force with magnitude 5.49 N, which acts against the object's velocity. What is the work (in J) needed to move the object at constant speed for the following routes? y (m) C B (5.00, 5.00) A x (m) © (a) the purple path O to A followed by a return purple path to O ] (b) the purple path O to C followed by a return blue path to O ] (c) the blue path O to C followed by a return blue path to O ] (d) Each of your three answers should be nonzero. What is the significance of this observation? ○ The force of friction is a conservative force. ○ The force of friction is a nonconservative force.
A block of mass m = 2.50 kg is pushed d = 2.30 m along a frictionless horizontal table by a constant applied force of magnitude F = 10.0 N directed at an angle 25.0° below the horizontal as shown in the figure below. m (a) Determine the work done by the applied force. ] (b) Determine the work done by the normal force exerted by the table. ] (c) Determine the work done by the force of gravity. ] (d) Determine the work done by the net force on the block. ]
A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.845 m/s encounters a rough horizontal surface of length = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.357 and he exerts a constant horizontal force of 294 N on the crate. e (a) Find the magnitude and direction of the net force on the crate while it is on the rough surface. magnitude direction ---Select--- N (b) Find the net work done on the crate while it is on the rough surface. ] (c) Find the speed of the crate when it reaches the end of the rough surface. m/s

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