- #1
Electrostatic force and magnitude problem
- Thread starter loganblacke
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AI Thread Summary
The net electrostatic force on charge Q1 is zero, and its value is +4.99 nC. To find the magnitude of charge Qo, the formula Qo = (r0/r1)^2 * abs(q)*2cos θ is suggested. Participants emphasize the importance of treating forces as vectors, requiring the addition of forces based on their directions. The direction of each vector is determined by the line connecting the two charges. Understanding these vector components is crucial for solving the problem effectively.
- #2
tiny-tim
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hi loganblacke! 
(have a theta: θ and try using the X2 icon just above the Reply box
)
forces are vectors, so you have to add them as vectors
(have a theta: θ and try using the X2 icon just above the Reply box
)forces are vectors, so you have to add them as vectors
start by writing out the three forces as three vectors
- #3
loganblacke
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How do i determine the direction of the vectors?
- #4
tiny-tim
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each vector will point along the line between the two charges
Kindly see the attached pdf. My attempt to solve it, is in it.
I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction.
I'm not able to figure out, why my solution is wrong, if it is wrong .
Neglect gravity other than that of water; neglect friction.
F1=ρgsh=1000*10*1*(1+4)=50000 N;
F1=ρgsh=1000*10*0.1*4=4000 N;
F3=50000-4000=46000 N?
TL;DR Summary: I came across this question from a Sri Lankan A-level textbook.
Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water.
I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
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