Free introductory physics homework help step by step from qualified mentors. Algebra and calculus based general physics homework. High school and undergraduate level.
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The Bohr Radius and reduced mass
- squelch
- · Replies 11 ·
The allowed radii and energies of positronium
- squelch
- · Replies 1 ·
I'm trying to find electric potential.
- +Jace090+
- · Replies 12 ·
Frame of reference of bicycle rider
- Alex_Neof
- · Replies 2 ·
Potential difference and conductors
- henry3369
- · Replies 6 ·
Calculating energy released by fission.
- nima rahmani
- · Replies 2 ·
Glider moving along an inclined track?
- sammyg18
- · Replies 3 ·
Power dissipated in variable resistor?
- CAH
- · Replies 9 ·
Question on capacitors in an RC circuit
- BlueCerealBox
- · Replies 4 ·
Density and centre of mass problem
- Muffintoast
- · Replies 8 ·
Entropy change of a reservoir after heating something up
- Robsta
- · Replies 3 ·
Does Young's Modulus Change When Nano-Tubes Are Connected End-to-End?
- BoanviaFx
- · Replies 2 ·
Speed of the rod as it leaves the rails?
- nawand
- · Replies 2 ·
How many electrons make up a charge of -15.0 uC?
- Kaylee Hamann
- · Replies 6 ·
Electrostatic Force Concept Question
- whitejac
- · Replies 5 ·
Simple Optics Problem (plane mirror and lens)
- AKJ1
- · Replies 5 ·
How Does Magnetic Field Angle Affect Force on a Current-Carrying Loop?
- Angie K.
- · Replies 4 ·
Magnetic Launcher HW: Find Constant Current Flow
- Angie K.
- · Replies 1 ·
Calculating Adiabatic Cooling at 1000 Meters Using Atmospheric Law
- EzequielSeattle
- · Replies 2 ·
Potentiometer Problem: 3V Battery, 100cm Sliding Wire, and 60cm Voltmeter
- kaka01
- · Replies 2 ·
Light problem -- diffraction grating distance between adjacent bright fringes
- student07
- · Replies 5 ·
Transformers Current and Voltage
- xvivi
- · Replies 3 ·
Thevenin's Problem: Solve for Voltage, Current, Power
- merchant
- · Replies 3 ·
Finding V2 when three equal resistors and voltmeters show different readings
- kaspis245
- · Replies 42 ·
Finding the number of stars in the milky way
- BOAS
- · Replies 1 ·
Pressure in horizontal rotating tube
- jonny23
- · Replies 3 ·
Force required to hold a pendulum at an angle
- kabirtomer
- · Replies 1 ·
Tension in landing cable on an aircraft carrier
- Alex Thiebes
- · Replies 4 ·
Block Sliding Down a Ramp that is Free to Slide
- PokemonMaster
- · Replies 4 ·
Compton scattering: finding electron scatter angle and final velocity
- Harry Atkinson
- · Replies 1 ·
Heat Transfer - finding rate of heat transfer
- scrubber
- · Replies 6 ·
Diffraction grating and wavelength
- CAH
- · Replies 1 ·
The current, Potential Difference, in a 3-cell circuit
- YarnJunior
- · Replies 3 ·
How Does Doubling the Force Affect Kinetic Friction Between Two Blocks?
- toesockshoe
- · Replies 6 ·
Forces in Equilibrium acting on wall climber
- RobertLelik
- · Replies 8 ·
Electric Field and Acceleration for a Single Charged Plate and Capacitor
- Zbud
- · Replies 3 ·
How Does Acceleration Affect the Twin Paradox?
- BlackyTheCat
- · Replies 6 ·
What is the Wavelength of Light Used in a Double-Slit Interference Experiment?
- student07
- · Replies 2 ·
What is the percentage uncertainty in V when L1-L2 is 30?
- Rohan1997
- · Replies 4 ·
Momentum in a space shuttle and thrust
- fogvajarash
- · Replies 17 ·
Why does increasing bits decrease step height in quantization?
- PhysicStud01
- · Replies 18 ·
Internal energy and heat of vaporization
- hs764
- · Replies 1 ·
Speed and Frequency of Waves Lab
- member 529879
- · Replies 12 ·
Finding acceleration of block connected to pulley with mass
- AdityaDev
- · Replies 14 ·
How Does Acceleration Affect Spring Stretch in an Adiabatic Piston System?
- AdityaDev
- · Replies 8 ·
Oscillation of point charge due to electric field
- sushichan
- · Replies 1 ·
Free body diagrams and Newton's Law
- Kenny Wallace
- · Replies 1 ·
Where to Place a Fiducial Marker in SHM Systems?
- Rohan1997
- · Replies 2 ·
Why is the Height at Point A Considered to be 2R in a Loop-the-Loop Problem?
- Dr. Who
- · Replies 3 ·
What is the solution to the Wedge-Spring-Block Problem?
- DSM_
- · Replies 7 ·
Why do optical and radio astronomers see different properties of active galaxies?
- mrjaffa
- · Replies 10 ·
Solenoid Field Strength - Missing Raduis?
- Euler2718
- · Replies 2 ·
Calculating Induced EMF in a Long Wire Using Flux and Lenz Law
- NewYorkMets
- · Replies 1 ·
Average kinetic energy of harmonic oscillator
- shanepitts
- · Replies 2 ·
Time period of a pendulum made of two disks
- vishwesh
- · Replies 4 ·
Martian's Weight on Mars Calculated
- AmericanBoy
- · Replies 8 ·
Question on gravitation and rotation of the Earth
- AakashPandita
- · Replies 5 ·
Simultaneous measurement of the momentum component px
- jdawg
- · Replies 2 ·
How Do Radiation Weighting Factors Affect Equivalent Dose Calculations?
- CheesyPeeps
- · Replies 1 ·
Calculating Vertical Height with Ground Reaction Force, Mass, and Time
- phambino
- · Replies 1 ·
A question regarding an experiment with a magnet and a tube
- Thomas_phys
- · Replies 13 ·
Output voltage of a transistor circuit with 4.3 V zener diode
- cpburris
- · Replies 2 ·
Calculate Wavelength of 6th Line in Balmer Series
- JJK1503
- · Replies 3 ·
Standing wave with specific initial/boundary conditions
- Isow
- · Replies 3 ·
Momentum problem -- The collision of two particles with different masses
- A.MHF
- · Replies 3 ·
Why Do Pylons Collapse in Extreme Temperatures?
- CheesyPeeps
- · Replies 3 ·
Construct B field from a given E field using Maxwell's Eqns
- Robsta
- · Replies 2 ·
Have You Calculated Mass Flow Rate Correctly in Fluid Dynamics?
- Camerontocher
- · Replies 3 ·
Find distance of focus point (conceptual)
- Shinwasha
- · Replies 2 ·
Find force to raise load using friction and two bars
- bkw2694
- · Replies 8 ·
How Did John Massis Move Two Railroad Cars with His Teeth?
- copypacer
- · Replies 4 ·
Finding the second force on a 2.43 kg box with acceleration in third quadrant
- copypacer
- · Replies 8 ·
What Speed and Radius Conditions Keep the Hanging Mass Stationary?
- toesockshoe
- · Replies 3 ·
Calculate force required to tip beam on a rope w/ friction
- bkw2694
- · Replies 7 ·
Finding support forces on a horizontal bar with a mass on the end
- Addem
- · Replies 2 ·
Static Equilibrium - trick question?
- prettydumbguy
- · Replies 3 ·
Ball rotating on rod with two strings separated vertically
- toesockshoe
- · Replies 24 ·
Find the average force exerted on a bullet by a rifle
- Emmerus Yiis
- · Replies 1 ·
Why is the Velocity Too Fast in My Fluids Momentum Conservation Calculation?
- Jaydude
- · Replies 1 ·
General wave equation conceptual questions
- ColtonCM
- · Replies 4 ·
Finding current in 19.1Ω and 10Ω resistors in parallel
- Angie K.
- · Replies 3 ·
Newton's second with Pullys, Ropes, and Boxes (Frictionless)
- SpacemanRich
- · Replies 10 ·
RC Circuit with a Switch: Potential and Charge Analysis
- Angie K.
- · Replies 3 ·
Two charged capacitors connected through a resistor
- jh001
- · Replies 3 ·
Hydrostatic force on a gate using F = ρgA(h̄)
- lvluffinz
- · Replies 10 ·
How Do You Calculate Decibel Intensity at a Distance in Spherical Waves?
- PCPanos
- · Replies 2 ·
Ampere's Law and charge on the capacitor
- jsko
- · Replies 4 ·
Torque on a point particle with vertical gravitational force
- Cal124
- · Replies 11 ·
Heat transfer through brass and rubber
- max1995
- · Replies 1 ·
Gravitation attraction of inner portion problem
- mooncrater
- · Replies 1 ·
Newtonian Gravitation and stuff
- mooncrater
- · Replies 11 ·
Centripetal motion, find radius - which solution is correct?
- Tyrannosaurus_
- · Replies 2 ·
Standing waves in tube closed tube
- Arcthor
- · Replies 6 ·
Compton effect problem - Find angle and energy of scattered electron
- akennedy
- · Replies 16 ·
3 questions on power and energy
- jinkyfishies
- · Replies 5 ·
How does the Levitron "break" Earnshaw Theorem?
- Muradean
- · Replies 7 ·
Comparing Earth's electric and gravitational fields
- pdaniel
- · Replies 1 ·
Can a Thermometer Be Calibrated Without Using the Formula Provided?
- Demister
- · Replies 2 ·
Equivalent circuit for a battery.
- Yam
- · Replies 4 ·
Using nuclear shell model to determine parity and spin
- Flucky
- · Replies 4 ·