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1. ### Two circular rods, one steel and the other copper, are both 0.715 m long and 1.50 cm in diameter.?

Young's modulus E = σ / ε = (F/A) / (ΔL/L) = FL / AΔL which rearranges to ΔL = FL / EA and so it comes down to what you take for the moduli of steel and copper...

1 Answers · Science & Mathematics · 11/09/2019

2. ### is it normal for an israeli girl to be 146 cm tall at 21 years old?

That's just under 5 ft, for Americans. That's short, but not abnormal. I know several people who are that height and lead perfectly normal lives. One of the most beautiful women I know is that height. The only problem is that she...

2 Answers · Health · 19/08/2019

3. ### 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

4. ### 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

5. ### 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

6. ### What is the density (in g/cm^3) of a piece of copper that has a mass of 1.12 oz and occupies a volume of 3.54 mL?

Density .... Convert ounces to grams. Everyone knows that 1 milliliter is equivalent to 1 cubic centimeter. D = m / V D = (1.12 oz x 28.3495 g / 1 oz) / 3.54 cm³ = 8.97 g/cm³ The answer can only be...

5 Answers · Science & Mathematics · 09/07/2019

7. ### A steel cylinder holds 1.50 g of ethanol. What is the pressure of the ethanol vapor if the cylinder has a volume of 251 cm^3 ?

moles ethanol = 1.50 g / 46.07 g/mol = 0.03256 mol PV = n RT P = nRT/V P = 0.03256 mol (0.08206 Latm/molK) (523 K) / 0.251 L P = 5.56 atm If you need pressure in a different unit, just use the R that...

1 Answers · Science & Mathematics · 10/02/2020

8. ### What is the resistance of a 11 cm -long piece of iron with a 1.5 mm × 1.5 mm square cross section?

Iron resistivity ρi = 97.1*10^-3 ohm*mm^2/m R = ρi*ℓ/s = 97.1*10^-3*0.11/2.25 = 0.0047 ohm

2 Answers · Science & Mathematics · 21/07/2019

9. ### Pair of closely spaced square conducting plates measure 14 cm on a side. The electric-field energy density between the plates is 5.5 kJ/m^3?

density µ = E² / ε₀ so E² = µ*ε₀ = 5500J/m³ / 8.85e-12 C²/N·m² = 6.2e14 N²/C² E = 2.5e7 N/C then E = σ / ε₀ = Q / Aε₀ Q = EA...

1 Answers · Science & Mathematics · 01/02/2020

10. ### A long, solid rod 5.7 cm in radius carries a uniform volume charge density?

I think we can use field E = λ / 2πrε₀ to find the linear charge density 20e3 N/C = λ / (2π*0.057m*8.85e-12 C²/N·m²) λ = 6.34e-8 C/m The rod has a cross-sectional area A = πr² = π(0.057m)² = 1.02e-2 m² and so the...

1 Answers · Science & Mathematics · 17/01/2020