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CBSE Class 11-science Answered

but sir density as we go deep keeps on changing then why the pressure should be calculated keeping density 1,,,, also as we go down the same volume of liquid would weight different and hence different pressure.
So you cannot tell me anything about contacting,.....well okkk 
Sir my question which i wanted to address was A rectangular plate of dimensions 6cm*4cm* and thickness 2mm is placed with its largest face on the surface of water. findd the downward force on the plate due to surface tension. surface tension of water is 7*10^-2 N/m
Asked by Nirbhay | 10 Nov, 2014, 06:42: PM
answered-by-expert Expert Answer
begin mathsize 14px style Given : straight l equals 6 cross times 10 to the power of minus 2 space end exponent straight m straight b equals 4 cross times 10 to the power of minus 2 space end exponent straight m straight d equals 2 cross times 10 to the power of minus 3 end exponent space straight m straight T equals 7.0 cross times 10 to the power of minus 2 space end exponent Nm to the power of minus 1 end exponent Perimeter space of space rectangular space plate equals 2 left parenthesis straight l plus straight b right parenthesis equals 2 left parenthesis 6 plus 4 right parenthesis cross times 10 to the power of minus 2 space end exponent equals 20 cross times 10 to the power of minus 2 space end exponent Force space on space the space plate space due space to space surface space tension space straight F equals Perimeter cross times straight T straight F equals 20 cross times 10 to the power of minus 2 end exponent cross times 7.0 cross times 10 to the power of minus 2 space end exponent straight F equals 1.4 cross times 10 to the power of minus 2 space end exponent space straight N Hence comma space the space downward space force space on space the space plate space due space to space surface space tension space is space 1.4 cross times 10 to the power of minus 2 space end exponent space straight N end style
Answered by Priyanka Kumbhar | 11 Nov, 2014, 08:49: AM

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