# Recent content by neoking77

1. ### Percentage Weight Question

Homework Statement You have a 20% w/v stock solution of a sugar of molecular weight 160 Daltons. How much of this stock solution will you need to use to... a. prepare 10 ml of solution at 350 mg sugar per ml. b. 7 ml of solution containing 15 micromoles of sugar Homework Equations...
2. ### Dilution Question

Homework Statement Addition of 2uL of 50mM NaCl to a 30 uL reaction gives a final NaCl concentration of ______ M. Homework Equations The Attempt at a Solution so because you add 2uL to 30uL, the dilution is (2 / 2+30) = 1/16 Then I multiplied the dilution with the concentration...
3. ### Dilution Question

Hello all, I just want to confirm that I am on the right track for a certain question regarding dilution and concentration Q: Addition of 2uL of 50mM NaCl to a 30 uL reaction gives a final NaCl concentration of ______ M. Attempt: so because you add 2uL to 30uL, the dilution is (2 / 2+30)...

help any 1 ?
5. ### What is the lowest-frequency standing wave

Homework Statement A 22-cm-long, 1.0-mm-diameter copper wire is joined smoothly to a 60-cm-long, 1.0-mm-diameter aluminum wire. The resulting wire is stretched with 20 N of tension between fixed supports 82 cm apart. The densities of copper and aluminum are 8920kg/m^3 and , 2700 kg/m^3...
6. ### Tension of String/ Mass question

Homework Statement The figure shows two masses hanging from a steel wire. The mass of the wire is 60.0 g. A wave pulse travels along the wire from point 1 to point 2 in 24.0 ms. What is mass m? Homework Equations v = sqrt(Ts/mu) The Attempt at a Solution T=mu*v^2 t = 0.024s d = 4m v =...
7. ### Doppler's Effect

omgosh ... i got the equation wrong...lol it's fo /(1 +/- vs/v) my bad. thanks
8. ### Doppler's Effect

Homework Statement A physics professor demonstrates the Doppler effect by tying a 600 Hz sound generator to a 1.0-m-long rope and whirling it around her head in a horizontal circle at 100 rpm. Homework Equations f =fo(1/ (V +/- Vsource/V)) The Attempt at a Solution T =...
9. ### VSEPR Question

Homework Statement Give the formula of a fluoride molecule that: is octahedral in shape is trigonal bypyramidal in shape is T-shaped ...etc The Attempt at a Solution Ok, I'm not really actually looking for an answer, because I already know the answers are SF6, PF5, and ClF3. And I have...
10. ### Phase Constant graph help

thanks a lot learningphysics and house md
11. ### Phase Constant graph help

all the solution is there, but i just don't understand the answer to part B. for part B, why is the sign negative?
12. ### Wave Speed As a Function of Tension

now i get it! thanks so much! the ansr i got was a=-1/2 and b=1/2, which is in accordance with v = sqrt(T/mu)
13. ### Wave Speed As a Function of Tension

by using exponents on both side, do u mean to raise m/s to the power of (a+b)(b-a)(-2b)??
14. ### Wave Speed As a Function of Tension

sry forgot to say mu is mass per unit length of the wire
15. ### Wave Speed As a Function of Tension

Homework Statement This is a question from my lab manual v=Cmu^aT^b (4.3) Use dimensional analysis of equation (4.3) to determine the exponents a and b. Homework Equations i know that the proper equation is v=sqrt(T/mu) The Attempt at a Solution I tried dimensional to get some...