Homework Statement
A metallic surface is placed in an electrostatic field. Derive an expression for the electric field on the metal surface.
Homework Equations
\oint \underline{E} \cdot d\underline{A}=\dfrac{q_{enc}}{\epsilon_0}
The Attempt at a Solution
My initial thought was to set up a...
Homework Statement
How would you find the period of a charged particle in an uniform electric and magnetic field?
The charged particle has velocity that is perpendicular to the magnetic and electric field (which are directed in the x-axis).
Homework Equations
F=q(E+vxB)
The Attempt...
Homework Statement
5 litres of an ideal gas which is initially at 300K and 10atm, and is expanded to a final pressure of 1atm. Find work done, change in internal energy, heat absorbed and change in enthalpy of the system if the process is isothermal and reversible.
Homework Equations...
Homework Statement
Two planets A and B have relative velocities 0.7c.
They can observe the birth of two stars, C and D.
According to planet A, star D was born 10 years before star C was born.
According to planet B, star C was born 20 lightyears farther than star D.
What is the time...
Homework Statement
Two spaceships A and B are launched from a point X, in opposite directions.
At time t=15 minutes, spaceship A crashes.
The velocity of the spaceships relative to X is 1.3x10⁸m/s.
How far did the collision happen from B, as observed by astronauts on the spaceship...
Homework Statement
I am not sure wether I should take the value of velocity as a negative or positive in momentum questions.
A cart (cart 1) of mass 5kg is travelling to the right with a velocity of 5m/s and another cart (cart 2) of mass 5kg is travelling to the left with a velocity of 1m/s...
Homework Statement
If a question asks to calculate total energy of an object that does have a horizontal velocity (constant, air resistance ignored), and it is at it's highest point so it's vertical velocity is zero.
I need to know how you'd calculate the total energy of this object...
Homework Statement
I am looking into the first law of thermodynamics.
But I'm not sure with some parts.
Homework Equations
dU=Q-W What does it mean when U Q and W are negatives.
Also solids with W=0
The Attempt at a Solution
So the equation will change to -U=-Q+W
Does it lose it's...
Homework Statement
a) A microwave transmitter T and receiver R are placed side by side facing two sheets of material M (aluminium) and N (hardboard). A very small signal is registered by R; what can you deduce about the experimental set up?
b) When M is moved towards N a series of maxia and...