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Physics doubts

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germany_ballackrox




PostSubject: Physics doubts Wed Feb 20, 2008 7:12 pm

1. A man rowing upstream is at rest with respect to the shore. Is he doing work?

2. State 2 conditions for formations of pure spectrum
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nidin




PostSubject: Re: Physics doubts Thu Feb 21, 2008 12:17 pm

1. he is not doing work wid respect 2 the shore bcoz der is no displacement.however he is doing work wid respect to the stream
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germany_ballackrox




PostSubject: Re: Physics doubts Sat Feb 23, 2008 10:35 pm

wat do you mean by doing wokr against stream....do you mean that negative work is bieng done as angle betweeen force and displacement is 180
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PostSubject: Re: Physics doubts Sat Mar 01, 2008 12:40 pm

2. State 2 conditions for formations of pure spectrum

ans:condition 1: A narrow parallel beam of white light should be made incient on the prism.
condition 2:the prism should be placed in the position of minimum deviation
condition 3:the emergent parallel beam should be focussed on the screen
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Cidermaker




PostSubject: Re: Physics doubts Wed Mar 12, 2008 11:36 pm

The work done against stream is neutral .You cannot take it as retardation as there is no displacement.
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madhurasangeetam




PostSubject: Re: Physics doubts Sun Mar 22, 2009 7:49 pm

The person is doing +ve work against the stream. As some of you said, here the force and displ are not opposite. they are in the same direction. ( wrt a person on the bank it appears to be zero. but it is only imagination.)
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Complete IIT AIEEE ICSE ISC PMT help forum :: Physics :: Physics Question answer-