## Flight Centrifuge

The flight centrifuge A flight centrifuge was designed to simulate the flight in a space vehicle. The arm which is $d=40 ft$, rotates about axis A-A. The cockpit rotates itself… Click here to read more

Physics tutorials, questions and answers

This site was started back in 2008, and features, among others, a collection of physics homework exercises and tutorials for all levels of physics students (high school and college).

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The flight centrifuge A flight centrifuge was designed to simulate the flight in a space vehicle. The arm which is $d=40 ft$, rotates about axis A-A. The cockpit rotates itself… Click here to read more

Classical electron We know from theory that a charge (an electron) that is accelerating in an atom, gives out energy at a rate of $W=\frac{2}{3}\frac{a^{2}e^{2}}{c^{3}} (ergs/s)$ where $c$ is the… Click here to read more

You have a symbolic falling cat. This cat is made up of two cylinders, a heavy one (the body) and a smaller one (the tail) as in the figure. You… Click here to read more

For the ground state of Hydrogen please find the most probable value of the electron position $r$. The probability that the electron is found between $r$ and $r+dr$ is $P=|R_{nl}… Click here to read more

An empty sphere is charged. (the inner and outer radii of the sphere are $R_0$ and $R$). Please find the empty sphere field and potential as functions of $R$. What… Click here to read more

Lagrangian symmetry Let up consider a one dimensional, two particles system. The two particles have an attractive force between them of the type $F=-kr^2$. Use the general coordinates $X$ (the… Click here to read more

Car Tire Pressure Prior to a street venture you verify the tire pressure on every one of the 4 tires worn out on your auto. You discover each is at… Click here to read more

A cylindrical capacitor is made up from two concentric cylinders ($R$ and $2R$). Inside the 2R cylinder there is a dielectric from 2R to 1.5R of constant $k=3$. The charges… Click here to read more

You are given a swinging pendulum that has a length of $l=10 cm$. This pendulum oscillates with a small amplitude. The amplitude of this swinging pendulum is $A=1 cm$ (when… Click here to read more

The CD player The GaAs semiconductor gap is 1.43 eV, while the AlGaAs gap is bigger of 2.06 eV. Please find a) The characteristic wavelength of photon absorbed by the… Click here to read more

A room that has walls that absorb sound has an open window of dimensions 2 x 1 m. There is a loudspeaker outside this room situated at a distance of… Click here to read more

Potentiometer and Resistor The resolution of a potentiometer is 0.1 mm, its length is 50 mm and its diameter is 5 mm. Please find the total resistance if the wire… Click here to read more

The Phonograph Experiment James and John bought from a sale an old phonograph. The phonograph speed can be changed. They are trying to do a physics experiment. The phonograph has… Click here to read more

The transformer and rectifier For a transformer that has two identical windings, the voltage from its center to one side is 22.0 V. The rectifier is made with two identical… Click here to read more

Tritium and Deuterium Please find energy that is necessary to remove a neutron of tritium ($^3H$) to give a deuterium atom ($^2H$) and a neutron. The rest energy for: neutron… Click here to read more

Wire loops in an external magnetic field One wire loops that is having a current 0f 140 mA and a radius of 0.06 m. This loop is situated in a… Click here to read more

Magnetic Fields of Sun and Earth The magnetic moment of Earth is $8*10^{22} A/m^2$ which is a big value. Also the Magnetic moment of Sun is big, but the distance… Click here to read more

The Simple Pendulum You are given a pendulum that is made from a rod of length b having at its end two masses m and M. Mass M can move… Click here to read more

The STM Please find the tunneling probability for a STM (Scanning Tunneling Microscope), if the probe work function is 4.0 eV, the gap is 0.50 nm and the atom is… Click here to read more

Charged wires You are given two parallel wires, charged with the same charge in absolute value, one is positively and the other is negatively charged. a. Find the electric field… Click here to read more