Homework Statement
I just want to focus on the divergence outside the cylinder (r >R)
Homework Equations
The Attempt at a Solution
For r > R, I said ∇ * E = p/ε
But that's wrong. The answer is ∇ * E = 0
I'm confused because there is definitely an electric field outside the cylinder (r...
Homework Statement
Homework Equations
The voltage between any two points due to the field from a point charge q is:
Kirchoff's voltage laws, which states that the total voltage around a closed loop must be zero, i.e.:
The Attempt at a Solution
To find V(e<-d) I used Kirchoff's...
1. The problem
The answer is A.
Homework Equations
x = Acoswt
y = Asinwt
The Attempt at a Solution
C is not correct because the x & y positions are in terms of sin & cos, so the acceleration can't be constant.
D is not correct because x & y are oscillating in value.
E is not correct because...
1. Problem
A rocket has landed on Planet X, which has half the radius of Earth. An astronaut onboard the rocket weighs twice as much on Planet X as on Earth. If the escape velocity for the rocket taking off from Earth is v , then its escape velocity on Planet X is
a) 2 v
b) (√2)v
c) v
d) v/2
e)...
Q: Why does the pin have a vertical force in this diagram (Static equilibrium)?
The diagram depicts as follows:
A mass (M) sits a a distance (d) away from the end of a board of length L. The board has a mass of m and is held to a wall by a pin and string. The string has a tension (T) and is at...
Question: A streetcar is freely coasting (no friction) around a large circular track. It is then switched to a small circular track. When coasting on the smaller circle its speed is:
a) greater
b) less
c) unchanged
Relevant
Formulas:
w = v/r
KE = 1/2mv2
My teacher said the normal force from...