# Yahoo Web Search

1. ### 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

2. ### An octopus uses one sucker of diameter 2.54 cm on each of the two shells of a clam in an attempt to pull the shells apart. ?

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. ### 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

4. ### 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

5. ### 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

6. ### 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

7. ### An electron starts from rest 32.5 cm from a fixed point charge with Q = -8.50 nC. How fast will the electron be moving when it...?

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. ### When a particular wire is vibrating with a frequency of 4 Hz, a transverse wave of wavelength 82 cm is produced....?

V = λ*f = 0.82*4 = 3.28 m/sec

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

9. ### Two objects attract each other with a gravitational force of magnitude 1.01 10^-8 N when separated by 19.9 cm . ?

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

10. ### If ED = √8 cm and the area of ∆ABC = trapezoid ACDE, the length of AC is?

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