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  1. The volume of a sphere with radius "r" is given by: V = 4*π*r³/3 so: r = (3V/(4π))^(1/3) The surface area of a sphere with radius "r" is given by: A = 4π*r² You want to know the area given the volume...

    4 Answers · Science & Mathematics · 31/10/2019

  2. I've spent some time researching this and I'm pretty sure this is right: V = ∫E dr = ∫ (λ / 2πrε₀) dr = (λ / 2πε₀)*ln(R/r) = 4800 V The only question I have is "what is R" -- in other...

    1 Answers · Science & Mathematics · 25/01/2020

  3. It's just slightly shorter than average. Meanwhile your girlfriend is a full four inches taller than average for a woman. Just tell her it's not your fault she's so freakishly tall. :-)

    5 Answers · Family & Relationships · 05/10/2019

  4. moment od inertia J = m/2*r^2 = 0.34*7.9^2/10^4 = 0.00212 kg*m^2 angular acceleration α1 = 2PI/60*n/t1 = 0.10472*1750/6.9 = 26.56 rad/sec^2 friction torque Tf = J*0.10472*n2/t2 = 0.00212*0.10472*1500/49 = 0.0068 N*m accelerating torque T1 = J*α1 +Tf = 0.00212*26.56 +0.0068 = 0...

    1 Answers · Science & Mathematics · 23/11/2019

  5. (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

  6. 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

  7. 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

  8. 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

  9. 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

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