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  1. ... to the field there. field E = kQ / r² where k = 1/4πε₀ = 8.99e9 N·m²/C² and r = d*cos30º = d...

    3 Answers · Science & Mathematics · 22/01/2021

  2. ...; (a) T = 0.216 so ω = 2π/0.216 = 29.1rad/s ω² = k /m so k = 29.08² * 0.327 = 276.7 Force Constant  k = ...

    1 Answers · Science & Mathematics · 22/01/2021

  3. With a frictionless surface, the ball merely slides (not rolls); the initial spring energy is converted into PE: ½kx² = mgh ½ * 500N/m * (0.25m)² = 1kg * 9.8m/s² * h → → h = 1.6 m

    1 Answers · Science & Mathematics · 22/01/2021

  4. .../I = 1.6 / 20.2 µA = 0.079 MΩ or 79 k Ω

    1 Answers · Science & Mathematics · 21/01/2021

  5. ....       PS = PE ½kx² = mg(h + x)       k = 2mg(h + x) / x²       k = 2(0.142)(9.8)(0.622 + 0.0435501) / 0....

    2 Answers · Science & Mathematics · 20/01/2021

  6. The potential energy in the compressed spring becomes potential energy of the ball: ½kx² = mgh You are given k , m (convert to kg), and h, and you know g. Solve for x.

    1 Answers · Science & Mathematics · 19/01/2021

  7. S = (8πhc²/λ⁵) / (e^[hc/(λkT)] - 1) When I plug in all relevant variables and do the necessary unit conversions, I get S = 34 W/cm²·nm which matches none of your choices but...

    2 Answers · Science & Mathematics · 19/01/2021

  8. The work done BY the gas would be W = integral from v1 to v2 of p dv, but p = nRT/v = (p1 v1)/v. So you want the integral of (p1 v1) dv/v, which comes out to (p1 v1)*ln(v2/v1) = (140000 Pa)(0.77 m^3)*ln(0.26/0.77) = -117 kJ. Then the work done ON...

    1 Answers · Science & Mathematics · 17/01/2021

  9. When T is constant, then pV is also constant. p(final) = (2.22 atm)*(1/1.38) = around 1.6 atm but use a calculator.

    1 Answers · Science & Mathematics · 17/01/2021

  10. specific heat capacity of coffee cc = cw = 4.186 joule/(g*°C)  4.186(mc*80+(250-mc)*10) = 4.186*60*(mc+250-mc)  4.186 cancels 70mc+2500 = 60*250 mass of coffee mc = (60*250-2500)/70 = 179 grams mass of water mw = 250-179 = 71 grams 

    2 Answers · Science & Mathematics · 15/01/2021

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