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Newton's Law

Explain why Newton's First Law and the Law of Conversation of Momentum are essentially saying the same thing in different ways. Why is it useful to have these two ways of saying it?

Subject:

Physics

Topic:

Other

Posting ID:

17217

OTA ID:

103642

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Physics Practice Problems

1. (3) Ice has formed on a shallow pond and a steady state has been reached, with the air above the ice at −5C and the bottom of the pond at 4.0C. If the total depth of ice plus water is 1.4 m, how thick is the ice? Assume kice = 0.40 and kwater = 0.12cal/m · C · s. respectively. 2. (3) Professor Denethor has found it necessary to use a physics question to select whom should go from Minas Tirith to rescue the kidnapped ´Eowyn. Ideally only one would set forth, but while many of the valiant of Gondor sought the boon, none were able to answer correctly. Lowly stable boy Isaac Baggins begged to be given the opportunity, so intending to humiliate him Professor Denethor asked ... click for more

Subject:

Physics

Topic:

Other

Posting ID:

17237

OTA ID:

103846

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short answer

At night, when it's dark outside and you are standing in a brightly lit room, it is easy to see your reflection in a window. During the day it is not so easy. Account for these facts.

Subject:

Physics

Topic:

Other

Posting ID:

17343

OTA ID:

103000

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answer in meters/second

What is the speed of light in diamond?

Subject:

Physics

Topic:

Other

Posting ID:

17344

OTA ID:

103300

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Refraction problem

Light is reflected from a glass coffee table. When the angle of incidence is 56.0°, the reflected light is completely polarized parallel to the surface of the glass. What is the index of refraction of the glass?

Subject:

Physics

Topic:

Other

Posting ID:

17345

OTA ID:

103997

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