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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Equilibrium radioactive decay question
- nateja
- · Replies 2 ·
Finding max height and horizontal distance for tennis ball tosses
- KingPapaya
- · Replies 41 ·
Why Does Thin Film Oil Show Different Colors When Illuminated?
- whitehorsey
- · Replies 4 ·
How to solve a velocity problem as an initial condition problem
- Wolvenmoon
- · Replies 4 ·
Moving and not moving people using Lorentz transformation
- leroyjenkens
- · Replies 21 ·
Change in velocity when given a graph that shows time and acceleration
- flynnk567
- · Replies 2 ·
Deriving work-energy theorem without treating differentials as fractions
- Superman1271
- · Replies 20 ·
Doppler equation not making sense to me
- PsychonautQQ
- · Replies 4 ·
Solving for masses in an elastic collision
- mruss
- · Replies 4 ·
Finding the electric field at a given point
- kirax105strike
- · Replies 1 ·
Velocity Calculation - ball bouncing off a wall at an angle
- Molly1235
- · Replies 5 ·
What Is the Altitude of a Plane Traveling at Mach 2.5?
- jvdamdshdt
- · Replies 6 ·
How does oil affect the buoyant force of a block of wood versus water?
- agw
- · Replies 1 ·
Finding the magnitude of the electrostatic force from a thin rod
- nuagerose
- · Replies 3 ·
Calculating Average Speed of Tennis Ball
- Alucard2487
- · Replies 2 ·
Solve Average Velocity for Person Running Around Triangle
- jakb93
- · Replies 12 ·
What is the Minimum Size L for Uniform Density with Less Than 1% Error?
- xdrgnh
- · Replies 3 ·
Equation relating object size to pinhole camera image size
- Violagirl
- · Replies 2 ·
Determine the total charge on the surface?
- nuagerose
- · Replies 4 ·
Water being hosed into the air.
- rkum99
- · Replies 2 ·
How to find the average accleration on a velocity time graph
- wittlebittle
- · Replies 1 ·
Electric Field and Work on a Moving Charge
- anthonych414
- · Replies 1 ·
Tension and Force in pulley system
- Plasmosis1
- · Replies 7 ·
Determine the total charge needed to apply to the electroscope.
- NasuSama
- · Replies 23 ·
Approximate the strong force between two protons.
- tjhero123
- · Replies 1 ·
Electromagnetic Waves Questions
- whitehorsey
- · Replies 4 ·
Understanding Virtual Images in Lenses and Mirrors
- whitehorsey
- · Replies 2 ·
Reversible heat pump - Work input?
- Splint
- · Replies 6 ·
What is the value of θ when the error in sinθ ≈ θ is approximately 5%?
- Gee Wiz
- · Replies 5 ·
Adding a capacitor in series question
- awstinf
- · Replies 20 ·
Can the acceleration of the proton be negative for this situation?
- NasuSama
- · Replies 4 ·
How Do You Calculate Uncertainty in the Volume of a Cookie?
- lep11
- · Replies 9 ·
Temperature and pressure in a laboratory
- RafaelF13
- · Replies 7 ·
Three Phase PV Grid-Tied System(MPPT)
- JermziePV
- · Replies 2 ·
How to Determine the Units of a Homogeneous Equation in Physics
- MemoNick
- · Replies 13 ·
How Do You Calculate the Electric Field of a Ring?
- tuggler
- · Replies 7 ·
What Determines the Escape Speed from Earth's Gravitational Pull?
- hadronthunder
- · Replies 3 ·
Why Does Integration Differ Between Electric Fields of a Disk and a Line Charge?
- tuggler
- · Replies 1 ·
How do I apply Kirchhoff's laws to find I1, I2, I3?
- IronHide
- · Replies 26 ·
How Do You Calculate Object-to-Image Distance in Lens Systems?
- Aelo
- · Replies 7 ·
Finding amplitude, period, and phase shift from a cosine plot
- freezer
- · Replies 2 ·
How to calc the force needed to change direction of a moving object?
- Dastan
- · Replies 5 ·
What Is the Proper Length of Spaceship 2 in Its Rest Frame?
- Gemini_Cricket
- · Replies 15 ·
Percent uncertainty in Volume of a beach ball?
- eddiedowen
- · Replies 5 ·
Deriving the equation for distance fallen in free fall
- Sylis
- · Replies 4 ·
Why is the Induced Current Clockwise in this GRE Problem?
- PsychonautQQ
- · Replies 9 ·
HEY YOU Double Doppler/Radar Guns/Equation Derivation
- Jamie1995
- · Replies 2 ·
Finding Applied Force from Coefficient of Friciton and mass
- jmcpherson82
- · Replies 4 ·
Projectile motion, find speed/time of football kick
- QuantumCurt
- · Replies 7 ·
Position from velocity vs. time graph with two linear segments
- Psyguy22
- · Replies 4 ·
Special Relativity GRE question (Where is my method flawed?)
- PsychonautQQ
- · Replies 4 ·
John Taylor Classical Mechanics Chapter 1 Problem 46
- karmonkey98k
- · Replies 1 ·
John Taylor Classical Mechanics Chapter 1 Problem 22
- karmonkey98k
- · Replies 3 ·
How Do You Calculate Projectile Motion for a Cannonball?
- mattwild
- · Replies 3 ·
Thermodynamics- rms translational kinetic energy
- yaykey428
- · Replies 3 ·
Boat heading and relative velocity
- drjohn15
- · Replies 3 ·
Three hanging balls of uniformly distributed charge
- derravaragh
- · Replies 1 ·
Where Is the Electric Field Zero Between Two Negative Charges?
- tuggler
- · Replies 3 ·
Tricky problem - Find E-field of a sheet of charge
- mindarson
- · Replies 30 ·
What do the subscripts on r mean in Coulomb's law?
- UselessLadder
- · Replies 2 ·
Intro physics proportion question
- dylanhouse
- · Replies 5 ·
Predicting Final Velocities for a Head-On Elastic Collision Problem
- ~Fluffy
- · Replies 2 ·
Density of holes on a sprinkler for uniform water distribution
- forestmine
- · Replies 1 ·
Kinematics question - Rocket launch
- rhoadsy74
- · Replies 1 ·
Capacitance, Charge and Voltage (P.D.)
- MemoNick
- · Replies 4 ·
Kinematics question - An automobile accelerating and braking
- rhoadsy74
- · Replies 1 ·
Calculating Flux Linkage in a Rotating Rectangular Coil
- MemoNick
- · Replies 4 ·
Physics free-body diagram problem?
- kal854
- · Replies 2 ·
Which of the Following is false?
- spockjones20
- · Replies 3 ·
Finding I3 in a parallel resistor circuit with 12mA
- Gauss M.D.
- · Replies 3 ·
How Do You Solve the Motion of Two Colliding Pendulums?
- mattwild
- · Replies 1 ·
Puck sliding down a sphere: when does it lose contact?
- Habeebe
- · Replies 1 ·
Moment inertia - theoretical problem
- silenzer
- · Replies 5 ·
Why does i0 not flow from high to low potential in equivalent circuits?
- Miike012
- · Replies 2 ·
Voltage Divider: Solving for V in Series Circuits
- Miike012
- · Replies 2 ·
Equivalent resistance of a cube of resistors
- pc2-brazil
- · Replies 19 ·
Two charged masses hanging from strings in equilibrium
- inferno298
- · Replies 4 ·
What is the 1/e Lifetime of a Graph?
- Richard Ros
- · Replies 1 ·
Circumference of Earth With Eratosthenes
- tchouhan
- · Replies 4 ·
Time to Mars (orbit around Sun given perihelion and aphelion)
- oddjobmj
- · Replies 2 ·
How Do You Calculate the Time Period in a Spring-Block SHM System?
- Saitama
- · Replies 23 ·
Magnitude of Force of two point charges on a third (electrostatics)
- ctallarico20
- · Replies 12 ·
Having problems understanding units
- FTCC.student
- · Replies 6 ·
Mechanics - inclined plane with friction and finding max M
- skwissgaar
- · Replies 1 ·
Oppositely Charged Parallel Plates
- mattwild
- · Replies 6 ·
Calculating Reaction Force on a Stationary Wall in a Rotating System
- Dlong
- · Replies 1 ·
How Many Strides on a Moving Sidewalk?
- shealya
- · Replies 2 ·
Thermodynamics First Law Problem
- cytochrome
- · Replies 1 ·
Fluids question: U Shaped Tube.
- Eilrymist
- · Replies 2 ·
Calculating Orbital Radius for Geosynchronous Satellite Using Kepler's Third Law
- tchouhan
- · Replies 6 ·
What Are the Average Forces and Friction in These Motion Problems?
- The Precious
- · Replies 1 ·
Maximum potential given a charge
- c1223
- · Replies 2 ·
Separable PDE for electric field in a cavity
- gboff21
- · Replies 4 ·
Solve for position given force in a mass-spring system?
- kal854
- · Replies 2 ·
How High Was the Tree from Which the Squirrel Fell?
- Gazaueli
- · Replies 1 ·
Friction Acceleration: Solving for Coefficient and Force Angle
- rogerbrian05
- · Replies 1 ·
Finding centripetal acceleration and velocity
- FreshyT
- · Replies 1 ·
Leap Off an Asteroid: Escape Earthly Gravity?
- tjsingle
- · Replies 2 ·
Momentum Investigation: Car collision
- Silurias
- · Replies 2 ·
Circular motion problem with circular loops
- thunderhadron
- · Replies 10 ·