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...
Wow! Take it easy! I wasn`t 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)
Eh? That`s odd. I`ve never heard of a problem neglecting gravity before.
also isn`t (dot) multiplication.
NOTE: to a helper who is reading this: I really need help with my topci before 2 hours, please! :confused:
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...
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...
1.
OOPS! I`m 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 I`m having trouble since the only value given is the coefficient of...
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...