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  1. Assuming the system has no friction, it's a simple harmonic oscillator and therefore has constant mechanical energy. When the spring is fully stretched, all of that mechanical energy is spring potential E = PS E = ½kA²...

    2 Answers · Science & Mathematics · 28/05/2019

  2. When compressed, stored energy = ½kx² = ½(4500)(2.1)² = 9922.5 J When rock projected above energy will be given to the rock as kinetic energy. ie Kinetic energy of rock = 9922.5 J If it...

    3 Answers · Science & Mathematics · 25/11/2019

  3. At equilibrium position, there is no spring potential energy. E = 0.5mv^2 = 0.5*0.15*2.39^2 = 0.428 J

    2 Answers · Science & Mathematics · 28/05/2019

  4. work done by friction = loss of KE µmgd = ½m(V² - v²) mass m cancels 0.0751 * 9.8m/s² * d = ½ * (3.18² - 2.00²)m²/s² solves to d = 4.15 m ◄ Hope this helps...

    1 Answers · Science & Mathematics · 02/07/2019

  5. 1/R= 1/r1 +1/r2 ie., 1/38= 1/56+ 1/r2 Solving you get r2 = 118 kilo ohm.

    1 Answers · Science & Mathematics · 05/02/2020

  6. Yes. r, r1 and r2 do not depend on time explicitly. Therefore the motion is conservative.

    2 Answers · Science & Mathematics · 23/02/2019

  7. u = <40, 0, 64> (initial velocity) a = <0, -8, -32> (you have a typing mistake) v(t) = <40 + 0*t, 0 + (-8)t, 64 + (-32)t> . . . .= <40, -8t, 64 – 32t> (agreed) Remember displacement (s) in a given direction is...

    1 Answers · Science & Mathematics · 07/09/2019

  8. k Q^2 / d^2 = m g Q = sqrt( m g d^2 / k)

    1 Answers · Science & Mathematics · 01/05/2019

  9. 168ºC = 441 K (a) KE for both molecules is the same: KE = (3/2...

    1 Answers · Science & Mathematics · 15/11/2019

  10. L = Lo*(1+k*ΔT) L = 120*(1+17*10^-6*(24-21)) = 120.006 mm lenght increases by 6 μm

    1 Answers · Science & Mathematics · 20/10/2019

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