plz solve the questions 18ᵗʰ as well as 19ᵗʰ given below

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plz solve the questions 18ᵗʰ as well as 19ᵗʰ given below

Asked by sarveshvibrantacademy | 22 Mar, 2019, 10:25: AM

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As per our policy only one question is going to answer in one url

Solution of question 19 is attached. Option b is corr

y subscript 1 space equals 5 sin left parenthesis omega t minus k x right parenthesis y subscript 2 space equals space minus 5 cos left parenthesis omega t minus k x minus 150 right parenthesis space equals space minus 5 cos left parenthesis omega t minus k x minus 90 minus 60 right parenthesis space equals space 5 sin left parenthesis omega t minus k x minus 60 right parenthesis s o space y subscript 2 space equals space 5 sin left parenthesis omega t minus k x minus 60 right parenthesis f o r m space t h e s e space t w o space w a v e space e q u a t i o n space w e space c a n space s e e space p h a s e space d i f f e r e n c e space b e t w e e n space t h e s e space t w o space w a v e space i s space 60 degree ϕ space equals space 60 degree a s space w e space k n o w A subscript r e s end subscript space equals space square root of A subscript 1 squared plus A squared subscript 2 plus 2 A subscript 1 A subscript 2 cos ϕ end root p u t t i n g space a l l space t h e space v a l u e s space w e space g e t A subscript r e s end subscript space equals square root of 5 squared plus 5 squared plus 2 cross times 5 cross times 5 cross times cos 60 end root A subscript r e s end subscript space equals space square root of 25 plus 25 plus 25 space end root space equals space square root of 75 equals space 5 square root of 3

Answered by Ankit K | 23 Mar, 2019, 08:27: PM

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A transverse travelling wave represented by a equation: y = (1 cm) sin[2nx – 20πt]; where X is in meters and t is in seconds, is travelling on a string of mass per unit length 0.01 Kg/m. Find the kinetic energy (in mille joule) of a portion of the string of length equal to one wavelength. (Take : π² = 10)

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A wave traveling from the left encounters a junction between the heavy string in which it moves and a lighter one. The incoming wave divides equally into a transmitted and reflected component. What is the ratio of densities of the string?

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