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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What is the Acoustic Impedance of Wool?
- Coolguynice
- · Replies 3 ·
How to calculate impulse required to move an object vertical
- Roul
- · Replies 8 ·
(somewhat complex inclined plane problem) why is this wrong?
- EddiePhys
- · Replies 17 ·
Uncovering Wavelengths Not Reflected in a Soap Bubble Film
- rgold
- · Replies 3 ·
Calculating Combined Mass of Archer & Bow w/ Conservation of Momentum
- Balsam
- · Replies 9 ·
The net force on the charge placed at origin
- Jai Singh
- · Replies 1 ·
Why would his weight be zero at the moment of the fall?
- alaa amed
- · Replies 6 ·
Parameters of final image formed by lens system
- rgold
- · Replies 1 ·
Mesh current equation in matrix form
- vizakenjack
- · Replies 5 ·
Doppler effect in different scenarios
- takando12
- · Replies 1 ·
Over what frequency range are Maxwell's equations valid?
- MathPi
- · Replies 11 ·
Phase shift of light incident on 2 slits
- gsmtiger18
- · Replies 3 ·
Current in a solenoid (conceptual)
- Ally Doh
- · Replies 1 ·
Tension on a string attached to two objects
- unified
- · Replies 6 ·
How to calculate the size of a star with just temperature
- timnswede
- · Replies 3 ·
A simple static equilibrium problem
- unified
- · Replies 13 ·
What Was the Initial Velocity of the Second Car in the Collision?
- Balsam
- · Replies 7 ·
Golfing on North Pole (equation of motion)
- JulienB
- · Replies 6 ·
Glider and vertical circle question
- pauladancer
- · Replies 8 ·
How Do You Convert Atmospheric Pressure from Atm to PSI at High Altitudes?
- SanSan
- · Replies 3 ·
Question about E-Fields and Potential of a Coaxial Cylinder
- artoribio
- · Replies 8 ·
Projectile motion: find distance a ball would land
- phys1213
- · Replies 1 ·
Defintion of Neutron activation and moderation
- Suef
- · Replies 1 ·
Wave, finding the velocity of the incoming car.
- Physicsman567
- · Replies 2 ·
Formula relating thickness of pipe to fundamental frequency
- Zoro
- · Replies 7 ·
Force at Pipe Bend Outlet A: 0.0707(12cos120 - 12)
- foo9008
- · Replies 13 ·
Momentum, vector addition question
- ConfusedPhysics1234
- · Replies 5 ·
Firework Height Calculation: 712m, 23.6°C, Timer
- leedia
- · Replies 4 ·
Thermal Physics Expansion Coefficient Problem
- Bashyboy
- · Replies 13 ·
How Do Shell and Liquid Forces Achieve Equilibrium in a Hemispherical Container?
- Vibhor
- · Replies 35 ·
How does increasing the tension of a string affect various properties?
- GalacticSnipes
- · Replies 1 ·
Fluid mechanics - Pascal's principle
- muhammed_oli
- · Replies 2 ·
Significant figure round off when adding and subtracting
- n124122
- · Replies 6 ·
Power, Torque, and Velocity in a Pulley System
- David112234
- · Replies 1 ·
Assess the statements: about potential and kinetic energy
- late347
- · Replies 5 ·
What Is the Minimum Velocity Factor for a Lunar Orbit?
- Physgeek64
- · Replies 5 ·
Calculate falling distance when object is already in motion
- califauna
- · Replies 17 ·
Nuclear shell model, spin and parity predictions
- Incand
- · Replies 4 ·
Circuit settles to steady state and switch is opened
- j3dwards
- · Replies 11 ·
What is the Direction of Resultant Force on a Stationary Vane Caused by Water?
- foo9008
- · Replies 1 ·
Which Container Retains More Heat After 30 Seconds?
- LiamNi
- · Replies 8 ·
What Went Wrong with Calculating Spring Force in This Physics Problem?
- Balsam
- · Replies 23 ·
Beat Frequency of 2 Waves in Free Space
- nmsurobert
- · Replies 8 ·
Mean temperature of winding when current falls
- DevonZA
- · Replies 6 ·
Is the direction of resultant force to the left in this problem?
- foo9008
- · Replies 5 ·
Deriving an equation for water flowing from a tap
- Woolyabyss
- · Replies 5 ·
Simple Harmonic Motion and Energy Problem
- i_hate_math
- · Replies 16 ·
Easy Simple Harmonic Motion Problem
- i_hate_math
- · Replies 18 ·
Archived Electromagnetics field question
- yusufali
- · Replies 1 ·
Archived Can You Solve This Two-Body Dynamics Problem?
- hsphysics2
- · Replies 1 ·
Archived Weighted least-squares fit error propagation
- mbigras
- · Replies 1 ·
Why Does the Solution Use FH(6) Instead of FH(10) for Gate Force Calculation?
- foo9008
- · Replies 4 ·
What is the work that he does on his body?
- alaa amed
- · Replies 9 ·
How to determine what vector A is equal to?
- engphys204
- · Replies 6 ·
Reading the graph: find distances travelled
- late347
- · Replies 2 ·
What is the charge on the outer surface of the middle conductor?
- PhysicsInNJ
- · Replies 4 ·
Acceleration, Velocity and Position
- cvc121
- · Replies 6 ·
Biot-Savart's Law for cylindrical conductor
- Sho Kano
- · Replies 18 ·
Value of a wave at a time with a phase shift.
- Jake 7174
- · Replies 1 ·
Normal Modes and Normal Frequencies
- RicardoMP
- · Replies 6 ·
Are R3, R1, R2, and the capacitor in parallel?
- Scholar1
- · Replies 3 ·
What is the total kinetic energy of the rod?
- ccarit3007
- · Replies 1 ·
2 masses, friction and a spring
- Karol
- · Replies 9 ·
Find current induced in the photoelectric effect
- NihalRi
- · Replies 7 ·
Entropy Calc: Solving for 100 Mol Gas
- ljeonjko
- · Replies 6 ·
Gauss's Law Problem: long, cylindrical charge distribution
- Kaleem
- · Replies 4 ·
How Does Ohm's Law Apply to Parallel Circuits?
- n124122
- · Replies 1 ·
Alpha decay ##Q##-value, recoil energy, momentum
- Incand
- · Replies 6 ·
The force when the distance is reduced
- aChordate
- · Replies 9 ·
Beta decay, electron capture Q value
- Incand
- · Replies 2 ·
What is the Maximum Speed Needed to Avoid a Collision?
- Amelina Yoo
- · Replies 1 ·
Pressure-volume graph and internal energy
- NihalRi
- · Replies 16 ·
Can Water Flow in Multiple Directions in a Network of Pipes?
- foo9008
- · Replies 15 ·
Signal to noise ratio in a CT scanner
- BobP
- · Replies 2 ·
Equilibrium and Force on Lower Hemisphere
- Vibhor
- · Replies 4 ·
Are My Gravitational Force and Field Calculations Correct?
- cvc121
- · Replies 3 ·
How Does Biot-Savart Law Calculate Magnetic Field at Point P?
- Sho Kano
- · Replies 7 ·
Find Electron Current Through Iron Wire
- bburke95
- · Replies 1 ·
SHM Q&A: Find Period given Max Speed & Acceleration
- Niall103
- · Replies 15 ·
Friction factor at turbulent region
- foo9008
- · Replies 19 ·
Confused with the energy equation in thermodynamics
- physea
- · Replies 46 ·
Find the initial velocity of a man falling in a boat
- Brady Aucoin
- · Replies 9 ·
Current through an inductor after a switch closes
- David Donald
- · Replies 4 ·
Comparing Acceleration and Time Of Different Slopesm
- dlacombe13
- · Replies 5 ·
Newton's First law: Barrier on large transport trucks
- Evangeline101
- · Replies 4 ·
Damped Harmonic Oscillator and Resonance
- Tissue
- · Replies 9 ·
Why does changing the frequency of a wave affect the energy?
- Oscar_Ross
- · Replies 14 ·
What causes the acceleration in a circular motion with a pulley system?
- Mastermind01
- · Replies 13 ·
Kinematics - How high is the balcony
- Evangeline101
- · Replies 2 ·
Calculating Magnification: Diverging and Converging Lenses Equations Explained
- brinstar
- · Replies 3 ·
Unable to understand how higher current results in lower p.d
- vinci
- · Replies 5 ·
Angular Momentum - rotating rod makes an angle phi with axis
- ben3
- · Replies 10 ·
X-ray Tube Output: 80μGy/mAs at 1m, 900µGy/s @1m
- BobP
- · Replies 4 ·
Final speed with mass, initial velocity, force, displacement
- TDizzl
- · Replies 7 ·
Uncharged object between two charged plates
- Biker
- · Replies 3 ·
How Does Intermolecular Potential Energy Behave in Ideal and Real Gases?
- sapphyrblud
- · Replies 2 ·
Intensity of an electric field near a wire -- With and without Gauss' Law
- ing_it
- · Replies 27 ·
Schrödinger Equation: Solving for Energy in a Semi-Infinite Square Well"
- Ashley1nOnly
- · Replies 3 ·
Can You Focus on Two Distances at Once?
- fridakahlo
- · Replies 1 ·
Calculating Velocity Vector for Cue Ball Collision
- Magnus Jahn
- · Replies 1 ·