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related to: Cm

1. ### a sphere has the volume 36π cm ^3 .What area does the sphere have?

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. ### The potential difference between the surface of a 2.4 cm -diameter power line and a point 1.4 m distant is 4.8 kV?

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. ### Is 5'7'' (170 cm ) too short for a guy?

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. ### A pipe with a 20 cm inner diameter is filled to a depth equal to one-third of its diameter. What is the approximate area in flow?

1 Answers · Science & Mathematics · 05/08/2020

5. ### A grinding wheel is a uniform cylinder with a radius of 7.90 cm and a mass of 0.680 kg. Calculate its moment of inertia about its center.?

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

6. ### Temperature changes from [25∘C] up to [125∘C] a tungsten wire filament [15 cm ] long with a diameter of [1.7 mm] will be used.?

(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

7. ### The Eiffel Tower is a steel structure whose height increases by 19.0 cm when the temperature changes from -9 to +42 oC.?

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

8. ### A bullet with a mass of 5.26 g and a speed of 832 m/s penetrates a tree horizontally to a depth of 6.24 cm . Assume that a...?

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

9. ### Consider two very small spheres of mass 8.65 grams, separated by 11.0 cm (from center to center). The spheres are charged by addin...?

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

10. ### A light, inextensible cord passes over a light, frictionless pulley with a radius of 9.5 cm . It has a(n) 18 kg mass on the left ?

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