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1. ### Commercial hydrochloric acid is 38 percent HCl by mass. The density is of this aqueous solution is 1.19g/cm^3?

(1.19 g/cm^3) x (1000 cm^3 / 1 L) x (0.38) / (36.4611 g HCl/mol) = 12.4 mol...

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

2. ### 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

3. ### Physics help?

The conventional "Right hand rule" says if you curl your fingers of the right hand from the radius vector onto the force vector, your thumb will point in the direction of the torque. with that rule, the top picture has torque in the -Z direction The other two...

1 Answers · Science & Mathematics · 22/07/2019

4. ### What’s the reverb height of a rubber ball about an inch radius from different heights? Is there a formula?

The formula for coefficient of restitution is: (Second bounce height/first bounce height)^1/2 The square root of the ratio of the height of one bounce to that of the preceding bounce gives the coefficient of restitution for the ball/surface impact. You should know that a super ball...

5 Answers · Science & Mathematics · 20/07/2019