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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Radiation Pressure: Solving for Magnetic Field
- jarfungus
- · Replies 1 ·
What Does Monochromatic Light Mean in Young's Double Slit Experiment?
- Ukitake Jyuushirou
- · Replies 6 ·
Centripetal force direction at the top of a ferris wheel
- Erwin Schrodinger
- · Replies 4 ·
What is the threshold for pain in decibels?
- bebe_boobs
- · Replies 5 ·
Thermal expansion of steel tape
- donjt81
- · Replies 6 ·
Finding emf and internal resistance from voltmeter readings
- Nabbsy88
- · Replies 1 ·
Tricky circular motion question
- Lisa...
- · Replies 4 ·
Explain how the "snap" of a wet towel is produced
- bebe_boobs
- · Replies 1 ·
How Does Momentum Conservation Apply in a Helicopter-Person System?
- something_about
- · Replies 3 ·
Structural features that minimize earthquake damage in buildings
- bebe_boobs
- · Replies 1 ·
Stress/strain/elongation question
- donjt81
- · Replies 2 ·
Moment of Inertia/angularvelocity question
- donjt81
- · Replies 6 ·
Does the Center of Mass Change When a Person Moves?
- something_about
- · Replies 2 ·
Quantization/hydrogen atom problem
- zl1corvette
- · Replies 2 ·
Max Range of Projectile on Non-Level Ground
- tman1
- · Replies 2 ·
Did I Make an Error in My Conservation of Energy Calculation?
- leolaw
- · Replies 1 ·
How Do You Calculate the Total Moment of Inertia for a Complex Wheel Assembly?
- physixnot4me
- · Replies 1 ·
Spring oscillation amplitude when elevator suddenly stops
- Kenny Lee
- · Replies 3 ·
Solving Open Pipe Problem with Tuning Fork Frequency
- Koyuki
- · Replies 2 ·
How Does Air Resistance Affect Car Velocity?
- Izekid
- · Replies 1 ·
Mass of air leaving a room with temp raised.
- Dantes
- · Replies 1 ·
Minimum velocity for bike jump to higher platform
- Lisa...
- · Replies 2 ·
Why doesn't intensity affect photoelectric current at constant frequency?
- Ukitake Jyuushirou
- · Replies 1 ·
How does the line spectra work?
- Ukitake Jyuushirou
- · Replies 3 ·
Cyclic frequency of unknown weight
- AdnamaLeigh
- · Replies 1 ·
Calculate the final speed of the pin
- JoeCool9
- · Replies 1 ·
Automobile Deceleration Problem
- mr1214
- · Replies 2 ·
Mirror reflection photography: focus distance for bird image
- kpangrace
- · Replies 1 ·
2 Question involving momentum and collisions
- DWigs87
- · Replies 5 ·
Calculate Absorber Thickness: 4.1 x 4.2 Inch Paper Weighing 36 Grams
- vvbandit
- · Replies 1 ·
How much heat energy is transferred to or from the gas
- Meteo
- · Replies 1 ·
Potential Energy Car Downhill Question
- lando45
- · Replies 6 ·
What happens when F > 90N in Atwood problem?
- physicsfox
- · Replies 3 ·
Heat loss through house walls and jogging energy
- ilovemoney518
- · Replies 1 ·
Force changing direction of velocity vector-like this?
- boris16
- · Replies 24 ·
Why does a rotating person slow down when raising their arms?
- jrd007
- · Replies 6 ·
How Does Special Relativity Explain Momentum in Particle Disintegration?
- thenewbosco
- · Replies 4 ·
How Accurate Is the Center of Mass Calculation for an Open-Top Cubical Box?
- suspenc3
- · Replies 1 ·
Conservation of Linear Momentum?
- suspenc3
- · Replies 7 ·
Net Force and Angle Problem: Find Solution!
- FishieKissie06
- · Replies 1 ·
Friction problem on cube of mass
- braindead101
- · Replies 3 ·
Why Are There Different Reference Potentials in Electric Potential Formulas?
- brentd49
- · Replies 2 ·
Uses and properties of plastics
- zap123
- · Replies 2 ·
Finding the Density of a Duck Floating on a Lake
- MKM
- · Replies 5 ·
Kinematics problem two stones falling one with velocity one at rest
- bark00
- · Replies 7 ·
Finding Carmelita's mass from canoe displacement during seat exchange
- suspenc3
- · Replies 1 ·
Why is the normal force on a pulley twice the string tension?
- vaishakh
- · Replies 1 ·
Deriving Common Moments of Inertia: Sphere I=\frac{2}{5}mr^{2}
- amcavoy
- · Replies 2 ·
When does a penny leave a vibrating block in SHM?
- bochai
- · Replies 2 ·
How Much Force to Accelerate a Box with Known Friction?
- BiG mAnN
- · Replies 3 ·
Calculating Diver's Descent Distance
- xytos
- · Replies 1 ·
Why Is My Calculation of Speed on an Inclined Plane Incorrect?
- kwise
- · Replies 5 ·
How do I calculate Fn and Ff for each wheel in an emergency stop situation?
- physicsfreak
- · Replies 7 ·
Damped and Driven Oscillation of a Bridge
- Canuck156
- · Replies 4 ·
How Does Physics Influence Soccer Ball Dynamics?
- terpsgirl
- · Replies 3 ·
Finding Carmelita's mass when she and Ricardo exchange seats in a canoe
- jalapenojam
- · Replies 37 ·
How Is Kinetic Friction Affecting the Pulley System with Different Masses?
- braindead101
- · Replies 6 ·
Barometric pressure to find height of building
- MKM
- · Replies 2 ·
Minimum friction coefficient for 4kg block on 12kg block at 5.2m/s²
- braindead101
- · Replies 2 ·
A stack of books (conflicting answers)
- ashum
- · Replies 1 ·
Problems w/ rotational dynamics and angular momentum
- jrd007
- · Replies 7 ·
Escape Velocity of a spherical asteroid
- SoccaCrazy24
- · Replies 4 ·
Preparing for a friction test with incline problems
- courtrigrad
- · Replies 1 ·
Is Electric Potential Simply a Measure of Volts Per Unit Charge?
- square_imp
- · Replies 1 ·
Direction of Torque - Understanding Angular Momentum and Precession
- Kenny Lee
- · Replies 3 ·
Centripetel acceleration and tension
- dnt
- · Replies 11 ·
How Is Entropy Related to the Minimum Work Needed to Cool Water?
- metalboyxp
- · Replies 1 ·
What is the electric field around a conducting sphere?
- square_imp
- · Replies 2 ·
How far does a car travel after accelerating to 60km/h in 4.2 seconds?
- Graham Downs
- · Replies 2 ·
Find Tension in String when Yo-Yo is Released
- amcavoy
- · Replies 5 ·
Energy and brightness of Jupiter at different distances from the Sun
- astronomystudent
- · Replies 3 ·
Momentum fo two blocks and spring
- lando45
- · Replies 10 ·
Speed of projectile at height h independent of launch angle
- Lisa...
- · Replies 7 ·
Finding friction force on a case in an accelerating truck
- courtrigrad
- · Replies 5 ·
Just a simple calculus question
- Lisa...
- · Replies 2 ·
Finding charge for moon-Earth Coulomb force equal to gravity
- chrish
- · Replies 2 ·
Bullet passing through two blocks at different speeds
- lando45
- · Replies 1 ·
Space Station - Conservation of Angular Momentum
- moo5003
- · Replies 2 ·
What are the key steps for solving a tennis ball impulse problem?
- jacy
- · Replies 3 ·
What Is the Fundamental Frequency If Successive Overtones Are 360 Hz and 400 Hz?
- PhysicBeginner
- · Replies 5 ·
Calculating force for constant speed: Blocks with friction and a pulley
- courtrigrad
- · Replies 2 ·
P.d. and current - One of them can exist without the other
- pizzasky
- · Replies 2 ·
Will a 200 m tall building topple in 200 km/h wind?
- HPVic03
- · Replies 2 ·
How Much Natural Gas Is Needed to Heat a House to 28°C?
- blue88
- · Replies 3 ·
Calculating Energy Requirements for Satellite Placement in Circular Earth Orbit
- rocketboy
- · Replies 8 ·
How Do You Isolate dS in the Equation dS(27.0m/s) = (dS + 30.0m)(9.0m/s)?
- Kandy
- · Replies 1 ·
Are These Dynamics Problem Answers Correct?
- ouse
- · Replies 2 ·
How Far Does the 40Kg Skater Move?
- suspenc3
- · Replies 2 ·
Finding the Centre of Mass of a Cubical Container
- suspenc3
- · Replies 3 ·
How Can the Bottom Block Receive Maximum Force Without Moving the Top Block?
- Tubs
- · Replies 6 ·
Why does buoyant force equal displaced fluid weight, not the net force above?
- beginner16
- · Replies 18 ·
Magnetic Field Direction in a Square Arrangement of Electric Currents
- singh390
- · Replies 3 ·
How Do Amplitude and Frequency Affect the Speed of a Spring in a Wave?
- 29 clicks
- · Replies 1 ·
Speed of cylinder rolling down ramp and around loop
- Punchlinegirl
- · Replies 2 ·
Rolling bowling balls down an incline: which reaches the pins first?
- Punchlinegirl
- · Replies 4 ·
Momentum change by increasing time of impact
- beginner16
- · Replies 3 ·
Stationary Waves: Finding Minimum Intensity Distance
- d0h
- · Replies 3 ·
What Is the Maximum Inclination for a Cylinder to Roll Without Slipping?
- Punchlinegirl
- · Replies 7 ·
A couple of angular accelaration problems
- backseatgunner
- · Replies 1 ·