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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Two opposite polarity charged capacitors in series
- Painguy
- · Replies 4 ·
Magnetic Field and spring constant
- rinspd
- · Replies 2 ·
E/U ratio for reflection coefficient of 1/2 at a step barrier
- PsychonautQQ
- · Replies 1 ·
Bright Bands in Single Slit Diffraction
- Joshb60796
- · Replies 19 ·
Physics HW- Falling Bodies, Part 3
- Medgirl314
- · Replies 60 ·
What is the wavelength of a 60MHz wave?
- rinspd
- · Replies 1 ·
How Far From the First Station Do Two Oppositely Accelerating Trains Meet?
- OmniNewton
- · Replies 3 ·
Conservation of Energy and Spring Constant
- anniec123
- · Replies 1 ·
What is the Best Wavelength for Heat Transfer in a Black Body Radiator?
- Saitama
- · Replies 10 ·
Hooke's Law/Work done on a spring system
- ZeGinger
- · Replies 3 ·
Why Does a Feather Hit the Ground Later Than a Steel Ball?
- Fullmetalx
- · Replies 2 ·
Quantum Mechanics - Quick integral probability question
- binbagsss
- · Replies 1 ·
How much does a steel measuring tape expand on a hot day?
- nickb145
- · Replies 7 ·
Spring damper system equation of motion
- btnsteve
- · Replies 7 ·
Physics Problem Involving Moment and Acceleration
- taylorkrauss
- · Replies 2 ·
How many columns are needed to support the roof of an underground tunnel?
- itachipower
- · Replies 2 ·
Special Relativity. Lorentz Boosts.
- binbagsss
- · Replies 3 ·
Conceptual question - rotational+translational motion
- rbigongi
- · Replies 1 ·
Calculate Rotational Energy of Ship's Anchor: 5000 N Weight
- MathewsMD
- · Replies 4 ·
Why Does a Sealed Water Bottle Crack in the Freezer?
- Gamma
- · Replies 3 ·
Car travels 8 km E, 8 km N, 16 km W—finding displacement
- Medgirl314
- · Replies 29 ·
Conservation of Linear Momentum (spring)
- songsteel
- · Replies 4 ·
Finding ΔH and ΔU when pressure on a liquid increases from 1 to 100 bar
- Kishlay
- · Replies 6 ·
K of Rotation vs Rotational Momentum
- Lamebert
- · Replies 8 ·
How Is the Spring Constant Derived from Young's Modulus, Length, and Area?
- nickb145
- · Replies 3 ·
Find Maximum Transverse velocity of string
- aseylys
- · Replies 1 ·
How to calculate a trapeze/ pendulum's arc distance
- katkinson
- · Replies 1 ·
How many neutrons are in a neutron star with a diameter of 42.0 km?
- MichiganSt35
- · Replies 3 ·
Are my calculations for R1 correct?
- anthonyk2013
- · Replies 6 ·
Solving Photoelectric Effect Problems in Grade 12 Physics
- rfull
- · Replies 1 ·
Angle between polarizer and analyzer
- bobsmithe
- · Replies 3 ·
How does gravity affect the velocity of a pendulum in circular motion?
- Panphobia
- · Replies 22 ·
Center of mass and angular momentum
- fogvajarash
- · Replies 9 ·
Why does a trapeze slow down over multiple swings?
- katkinson
- · Replies 2 ·
How Do You Manipulate Lenses for Optimal Image Placement?
- jvdamdshdt
- · Replies 3 ·
How to find the escape speed of moon Titan?
- Remon
- · Replies 6 ·
How Much Kinetic Energy is Lost
- RPascal206
- · Replies 2 ·
Trouble with a Passive RC Twin-T Notch Filter
- JJBladester
- · Replies 2 ·
Finding the speed of a block only by using the angle and Radius
- PhyIsOhSoHard
- · Replies 27 ·
Finding the Coefficient of Friction using Torque, and Forces
- 9997
- · Replies 1 ·
How Is the Angular Momentum of Earth Calculated?
- sammythesp3rmy
- · Replies 1 ·
Calculating the Image Height from a Double-Sided Spherical Mirror
- theintarnets
- · Replies 1 ·
Why don't bearing supports provide moments in these diagrams?
- princejan7
- · Replies 3 ·
Estimate global temperature increase from solar forcing
- nwag93
- · Replies 1 ·
Determining momentum from energy?
- Physics...blah
- · Replies 1 ·
Curve for a ramp resulting in shortest time possible?
- babblahbah
- · Replies 3 ·
When Should an Airplane Drop a Package to Hit a Target?
- divlysian
- · Replies 1 ·
What Determines the Minimum Height for a Marble to Complete a Loop-the-Loop?
- MathewsMD
- · Replies 3 ·
Angular Momentum of a rotating ball
- sammythesp3rmy
- · Replies 1 ·
Boundary conditions of 2 conductors
- Observer Two
- · Replies 5 ·
How to Find the Resultant Force from Multiple 3D Vectors?
- Skittlz
- · Replies 11 ·
Interpreting force in rotational motion
- MathewsMD
- · Replies 2 ·
Deceleration of an object due to friction
- keyofdoor
- · Replies 7 ·
Why is there more than 1 value for load W where there is no rotation?
- s3a
- · Replies 4 ·
What Causes Incorrect Section Placement in Static Equilibrium and Torque?
- itachipower
- · Replies 5 ·
Electric field due to uniform charged line
- muaymike
- · Replies 1 ·
Finding the potential difference given two unknown points.
- rslewis96
- · Replies 1 ·
Why is the following impossible? 2 trains
- feihong47
- · Replies 10 ·
What is the effect of an elastic collision between two blocks and a chain?
- StarPhysics
- · Replies 3 ·
Lorentz Force and right hand rule
- Edira
- · Replies 14 ·
Formula for calculating the distance traveled by accelerating object
- yhPscis
- · Replies 12 ·
How big a volume of intergalactic space would equal mass of Milky Way?
- amaliablachman
- · Replies 7 ·
Calculating Velocity & Retarding Force of Dropped Mass
- Apothem
- · Replies 3 ·
Calculating Final Velocity of a Spacecraft Crashing into the Moon
- PsychonautQQ
- · Replies 1 ·
Springs and dampers in series and parallell
- MannyPacquiao
- · Replies 9 ·
Boy chasing girl on shore with pursuit curve
- GregoryGr
- · Replies 5 ·
How Fast Do Two Identical Spheres Travel When They Meet in Space?
- Psyguy22
- · Replies 4 ·
Pendulum in an accelerating car
- andyrk
- · Replies 9 ·
Rotational Kinetic Energy of Planet
- rrfergus
- · Replies 2 ·
Rotational Energy and Linear Momentum Problem
- Arixal
- · Replies 2 ·
Where is the center of mass of this structure?
- Urmi Roy
- · Replies 6 ·
LAB: Bragg Diffraction Grazing Angle Error
- Gemini_Cricket
- · Replies 3 ·
Skiing both ways conservation of energy/1D kinematic
- J827
- · Replies 10 ·
Finding asteroid gravity and escape velocity from moon orbit data
- Psyguy22
- · Replies 18 ·
Question on calculated friction force between a ramp and a cart
- JackSac67
- · Replies 2 ·
Finding specific heat of metal with final temp ±1°C
- astru025
- · Replies 1 ·
Potential energy of spring and mass system
- rmfw
- · Replies 2 ·
Impedance as seen across two terminals
- anthonych414
- · Replies 2 ·
Calculating Time of Impact for a Ball Thrown Against a Wall
- SamAnthony
- · Replies 11 ·
Which statement applies to boiling but not to evaporation?
- coconut62
- · Replies 3 ·
Universal gravitation/escape velocity question
- physicsdb
- · Replies 5 ·
Proof That The Following System Does Uniform Oscilations
- DorelXD
- · Replies 85 ·
Finding acceleration of a car sliding down a curved path
- PhyIsOhSoHard
- · Replies 14 ·
Constant energy in an elliptical orbit
- Sleepycoaster
- · Replies 1 ·
Newton's Second Law / Archimedes Principle
- nxn
- · Replies 2 ·
Hydraulic pump force needed to support weight
- pmac
- · Replies 1 ·
How much will this wire shift?(not sure if my solution is right)
- Jarfi
- · Replies 10 ·
Relative Motion of a Motorcyclist on a Rotating Bike
- usn7564
- · Replies 2 ·
Solving a Truss: Methodial of Joints
- NoobeAtPhysics
- · Replies 3 ·
How Does Collision Time Affect Impulse and Momentum Change?
- Sylis
- · Replies 3 ·
Need some advice on uncertainties
- lemonysage
- · Replies 6 ·
Finding orbital velocity, period, and energy of a planet around a star
- Psyguy22
- · Replies 6 ·
Finding light paths in a mirrored square room using virtual images
- PintoCorreia
- · Replies 4 ·
Virtual cells created by repeated mirror reflections
- PintoCorreia
- · Replies 4 ·
How Do You Calculate Coulomb's Law in 3-D?
- nadiaz
- · Replies 6 ·
Finding braking force needed to stop a 1500kg car in 50m
- Apothem
- · Replies 1 ·
Using SUVAT and Newton's Second Law
- Apothem
- · Replies 13 ·
Bead sliding down a frictionless spiral: energy and angular momentum
- PhysicsKid0123
- · Replies 15 ·
Angular distance when hand moves twice the radius on steering wheel
- randomjunebug
- · Replies 2 ·
Are these statements always true for LCR circuits?
- BMW
- · Replies 1 ·