Recent content by Scirel

1. Help! Electricity and work

Two identical point charges of q = +1.25 x 10-8 C are separated by a distance of 1.10 m. What is the minimum amount of work required by an external force to move them closer together so that they are only 0.60 m apart? I have no idea how to do this. I tried using -q(Vb-Va), but that got me...
2. A few questions about water pressure, temp, and sound

Please! I truly need help before 10:00!
3. Application of Vectors: Work (calc 3)

Wow! Take it easy! I wasnt trying to make fun of you. Geez.. I literally have never seen a problem like that before. How can that be taken as an insult? anyway, there is one more thing to try. Are you sure your calculator is in degrees/radians mode? (for whatever the problem calls for)
4. Application of Vectors: Work (calc 3)

Eh? Thats odd. Ive never heard of a problem neglecting gravity before. also isnt (dot) multiplication. NOTE: to a helper who is reading this: I really need help with my topci before 2 hours, please! :confused:
5. Application of Vectors: Work (calc 3)

You forgot about Vectors. Force is a vector. It has X and Y components. Also remember about Mass x Gravity.
6. A few questions about water pressure, temp, and sound

OK. I have done most of them correctly on my own, I need 2 checked and help with one: Check: A sound source emits sounds of frequency 210 Hz that travel through still air at 340 m/s. The source moves away from the stationary listener at 80 m/s. Find the wavelength of the sound waves...
7. Need help with 2 problems

So, the equation: Nf*L/2*sin(90-theta)=Us*Nf*L*sin(theta) Will solve the problem? Making this L/2*cos(theta)=Us*L*sin(theta) then 1/2=Us*tan(theta) then 1/(2*Us)=tan(theta) and finally: arctan(1/(2*Us))=theta? Also, just to be sure, is the answer to: It takes a...
8. Need help with 2 problems

Wait.. is it just L?
9. Need help with 2 problems

1. OOPS! Im such an idiot. That was supposed to be the mass. If 460 is repalced with 520, will the problem be correct? 2. I thought I needed to meansure the length from where mg affects the ladder, in the middle. Also Im having trouble since the only value given is the coefficient of...
10. Need help with 2 problems

1.A 110 kg scaffold is 6.8 m long. It is hanging with two wires, one from each end. A 520 kg box sits 2 m from the left end. What is the tension in the left wire?(g = 9.8 m/s2) For this one I tried using: 6.8 *t=460*9.8*4.8+110*9.8*6.8/2 and solving for t, but I for some reaosn get...