Thanks for the reply!
All along I was doing my math wrong on adding the electric field vectors.
As r = (sqrt2/2)a
e = kq/(r^2)
e = kq/(a^2/2)
e = 2kq/(a^2) for each vector on one side.
Since there's 2 vectors on each side then it equals to 4kq/(a^2)
Combining the vectors using...
Homework Statement
I think it would be better if I put the picture.
Additional questions:
Find the direction of the electric field.
Find the magnitude of electric field due at C due to charges A, B, and D.
Homework Equations
Pythagorean Theorem.
E = kq/r^2
The Attempt at a Solution
For...
I see. It just hit me that a weighing scale shows the normal force and not the gravitational force.
So I did my work right, just not the final answer!
mg = Fn + .4mg
Fn = mg - .4mg, which then becomes .6.
Got it. Thanks again!
Homework Statement
When the elevator is at rest, the scale reads W.
Suppose the elevator now accelerates down-ward at a constant rate of 0.4 g.
What is the ratio of the new scale reading to the value W of the scale reading when the
elevator is at rest?
Homework Equations
Force...
I see, this was the way I saw it at first but I thought it's more complicated.
So:
Fx = Tsinθ = mv^2/r
Fy = Tcosθ = mg
T = mg/cosθ; plugging that in for Fx..
mv^2/r = mgtanθ, so..
v = √rgtanθ, where r = Length ? Not sure if I derived everything correctly.
Assuming I did everything right...
To be honest I'm not really sure, I don't remember paying attention to pendulums too much. I'm assuming it also rotates/spins as it moves? Not sure what can I tie with that.
Am I doing this problem the right way? But having that idea, maybe I should add rotational kinetic energy?:
1/2mv^2...
Homework Statement
A circular pendulum of length 1.2 m goes around at an angle of 25 degrees to the vertical.
Predict the speed of the mass at the end of the string. Use g = 9.8 m/s2.
Answer in units of m/sHomework Equations
1/2mv^2 = mgh
h = L - Lcosθ
The Attempt at a Solution
I used the...