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  1. (A) By J = σE, where J is the current density at a given location in a resistive material, E is the electric field at that location, and σ (sigma) is a material-dependent parameter called the conductivity.  =>E = J/σ =>E...

    1 Answers · Science & Mathematics · 05/07/2020

  2. Ptot = Patm + ρgh and A = πr² so max. force is F = PA = (Patm + ρgh)πr² Just stick values in. (If you weren't Anonymous I'd have done the whole thing, but you could be a tme-waster.)

    1 Answers · Science & Mathematics · 31/10/2020

  3. type of steel is needed. I'll guess at 12e-6 /K ∆L/L = α∆T 0.19/L = 12e-6(42– –9) L = 0.19 / (12e-6)(51) = 310 m Thermal Expansion ∆L/L = α∆T, α is linear thermal expansion coef  L...

    3 Answers · Science & Mathematics · 18/09/2020

  4. 1/2 m v*2 = F d 1/2 (5.26E-3)(832^2) = F (0.0624) F = 29175 N or 2.92E4 N to 3 sig figs (anonymous forgot the 1/2 on the left) When you get a good response, please consider giving a best answer. This is the only reward...

    2 Answers · Science & Mathematics · 11/01/2020

  5. Given: a = 18g,  By F = keq1q2/r^2=>ma = ke(q)^2/r^2 =>m x 18g = ke(ne)^2/r^2 =>m x 18g = [ke x n^2 x e^2]/r^2 =>n = √[{m x 18 x g x r^2}/{ke x e^2}] =>n = r/e x √[{m x 18 x g}/{ke}] =>n = (11 x 10^-2)/(1.6 x 10^-19) x √[{(8.65 x 10^-3) x 18 x 9.8}/{9 x 10^9}] =>n = 8.95 x 10^12

    1 Answers · Science & Mathematics · 07/06/2020

  6. a) (i) 18g - T= 18a/ (ii) T-2.3g = 2.3a from (i) and (ii) 18g- (2.3a +2.3g)=18a a=15.7a/20.3 = 7.58 m/s² b)  T= m(g-a)      T= 18(9.8-7.58)      T= 18(2.22)= 39.96 N

    1 Answers · Science & Mathematics · 28/06/2020

  7. The initial electric potential energy is U = kQq / d U = 8.99e9N·m²/C² * -8.50e-9C * -1.6e-19C / (0.325m) U = 3.76e-17 J and this gets converted into KE in the electron: KE = 3.76e-17 J...

    1 Answers · Science & Mathematics · 09/02/2020

  8. 1.01 10^-8 N ?? is that 1.01x10^-8 N F = G m₁m₂/r² = 1.01e-8 (6.674e-11) m₁m₂/(0.199)² = 1.01e-8 m₁ + m₂ = 5.02 two eq is two unknowns m₁ = 5.02 –  m₂ (6.674e-11) m₂(5.02...

    2 Answers · Science & Mathematics · 31/10/2020

  9. AC = 2.  See below for explanation. Notice that there are two similar triangles, ABC and EBD.  The area of EBD is twice that of ABC, since the trapezoid area is equal to that of triangle ABC. But, the square...

    3 Answers · Science & Mathematics · 19/12/2019

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