3 years ago

Most stars are a.brown fs b.main sequence c.white dwarfs d.pulsars

Physics

1 answer:

trapecia [35]3 years ago

3 0

I believe the answer is B. Main sequence

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Explanation:

I tried it and got it right.

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gladu [14]

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The maximum displacement of an oscillatory motion is A=0.49m. Determine the position x at which the kinetic energy of the partic

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Answer:

The position x, is ± 0.4 m.

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$E_T = U +K.E\\\\E_T = \frac{1}{2} kA^2\\\\ \frac{1}{2} kA^2 = U +K.E\\\\K.E = \frac{1}{2} kA^2 - U ----equation(1)$

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Equate (1) and (2)

$\frac{U}{2} = \frac{1}{2} kA^2 - U\\\\U = kA^2 -2U\\\\U+2U = kA^2\\\\3 U = kA^2\\\\3(\frac{1}{2} kx^2) = kA^2\\\\\frac{3}{2} x^2=A^2\\\\x^2 = \frac{2}{3} A^2\\\\x = \sqrt{\frac{2}{3} A^2} \\\\x = A\sqrt{\frac{2}{3} } \\\\x = 0.49\sqrt{\frac{2}{3} }\\\\x = + /- (0.4 \ m)$

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3 years ago

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