College Physics: Explore And Apply, Volume 2 (2nd Edition)
College Physics: Explore And Apply, Volume 2 (2nd Edition)
2nd Edition
ISBN: 9780134862910
Author: Eugenia Etkina, Gorazd Planinsic, Alan Van Heuvelen, Gorzad Planinsic
Publisher: PEARSON
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Concept explainers

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Chapter 30, Problem 43RPP
To determine

To explain: The reason for the fact that the number of neutrinos coming from the supernova that was detected in the large Magellanic cloud in 1987 was lower than expected from the given options:

a. The supernova actually occurred farther from Earth than astronomers thought.

b. Some of the neutrinos were converted into other types of neutrinos as traveled to Earth.

c. The model used to predict the number of neutrinos produced in the supernova makes some unreasonable assumptions.

d. The detector used was not as efficient as the designers thought.

e. All of these are possible explanations.

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I. Pushing on a File Cabinet Bob has been asked to push a heavy file cabinet down the hall to another office. It's not on rollers, so there is a lot of friction. At time t = 0 seconds, he starts pushing it from rest with increasing force until it starts to move at t = 2 seconds. He pushes the file cabinet down the hall with varying amounts of force. The velocity versus time graph of the cabinet is shown below. A. On the graphs provided below, 1. draw the net force vs. time that would produce this velocity graph; 2. draw the friction force vs. time for this motion; 3. draw the applied force (Fon Cabinet by Bob) VS. time for this motion (the first two seconds of this graph have been drawn for you). Velocity (m/s) Applied Force (N) Friction Force (N) Net Force (N) A -m B -U time (s) D time (s) time (s) time (s)
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Please draw a sketch and a FBD

Chapter 30 Solutions

College Physics: Explore And Apply, Volume 2 (2nd Edition)

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