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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Special relativity simultaneity
- Oz123
- · Replies 5 ·
Electric Current of an Orbiting Electron
- FelaKuti
- · Replies 1 ·
Change in entropy of a resistor
- Elvis 123456789
- · Replies 5 ·
Electrical Energy: 30-Day Output from Coal Plant
- agargento
- · Replies 3 ·
Angular Momentum and Torque of a Moving Particle
- agargento
- · Replies 1 ·
Scaling The Solar System By A Factor ##\alpha##
- XanMan
- · Replies 6 ·
How to find the cell voltage of this circuit?
- Shadow1999
- · Replies 16 ·
What is the velocity of the wedge after collision?
- stealthezio
- · Replies 18 ·
Electrostatic Forces in Equilateral Triangles
- Mohamed Walid
- · Replies 13 ·
Rotating and translating spool across a table
- hadsox
- · Replies 2 ·
Falling Man Lands: Distance from Building?
- quicksilver123
- · Replies 12 ·
Period of rotation for three stars in equilateral triangle orbit
- Vitani11
- · Replies 8 ·
What is the Correct Height to Hit a Billiard Ball for Rolling Without Slipping?
- ajcoelho
- · Replies 13 ·
Finding Tensions and Accelerations with Moveable Pulley
- ryao3688
- · Replies 5 ·
Interference from coherent light sources
- CricK0es
- · Replies 23 ·
Turbulent friction coefficient over a plate
- pressurised
- · Replies 1 ·
Change in EMF due to falling magnet
- Drizzy
- · Replies 1 ·
First law of thermodynamics: why some equations can't be used
- ashash_ash
- · Replies 2 ·
Why does x tan a = 0 prove horizontal projectile launch?
- Faiq
- · Replies 5 ·
Gravitational force on an astronaut from a nearby massive torus
- srecko97
- · Replies 8 ·
How do i find the final velocity of an object?
- Aldo
- · Replies 10 ·
Calculating how many surplus electrons on each sphere
- hotram
- · Replies 1 ·
Height of a projectile at two points?
- Vitani11
- · Replies 5 ·
Ball thrown upward with velocity 16 m/s at 3/5 max height
- quicksilver123
- · Replies 9 ·
2 astronauts near a space station (no rotation)
- redivider
- · Replies 1 ·
Kinematic equations for max height
- ravsterphysics
- · Replies 5 ·
Pressure at a certain depth when density varies
- pressurised
- · Replies 4 ·
Why does doubling spring constant halve elastic potential energy?
- ravsterphysics
- · Replies 4 ·
Calculating uncertainty with a set of angles
- zexxa
- · Replies 6 ·
Resultant of two waves -- Different amplitude+phase difference
- CricK0es
- · Replies 3 ·
How to Find i(t) for an Inductor in an LC Circuit?
- Abdulwahab Hajar
- · Replies 6 ·
Find The Percent Change In K.E. Of Rod Hit By Putty
- XanMan
- · Replies 2 ·
Careers that use introductory physics concepts
- mime
- · Replies 1 ·
Speed, momentum and total energy of a muon (SR)
- jasonchiang97
- · Replies 9 ·
Polarity of capacitor/inductor in RLC circuit
- Abdulwahab Hajar
- · Replies 5 ·
How to Calculate the Moment of Inertia for a Rod and Sphere System?
- Mohamed Essam
- · Replies 8 ·
Heat transfer through a cylindrical shell
- Ian Baughman
- · Replies 3 ·
Why is the normal force mg/cos(20°) on an incline?
- ravsterphysics
- · Replies 10 ·
Thevenin resistance in an opamp RC circuit
- Abdulwahab Hajar
- · Replies 2 ·
Problem graphing Irradiance and distance experiment
- SuchBants
- · Replies 5 ·
Current direction after changing inductor to short circuit
- Abdulwahab Hajar
- · Replies 2 ·
What is the Thevenin and Norton equivalent for the given circuit in Fig. 4.125?
- Abdulwahab Hajar
- · Replies 10 ·
How do I solve for the wavelength of an alpha particle?
- KP2727
- · Replies 6 ·
Stress/Strain and Youngs Modulus
- ravsterphysics
- · Replies 1 ·
Why does the direction of gravitational acceleration stay the same?
- ravsterphysics
- · Replies 3 ·
Explanation for hydrodynamic problem
- Mohamed Essam
- · Replies 19 ·
How to find Coeff of kinetic friction without mass?
- pierce_E
- · Replies 1 ·
Wind Turbine Blade Experiment: What is the Optimal Number for Maximum Voltage?
- CWatters
- · Replies 2 ·
Circumferential tangent in the cylinder
- decentfellow
- · Replies 27 ·
Ladder on a wall held in place by a peg
- Jacobiam
- · Replies 3 ·
Estimate the pressure exerted on a floor
- Neon32
- · Replies 5 ·
Heat exchange in an isolated system
- Ian Baughman
- · Replies 3 ·
Relativistic rocket equation (intuitive derivation)
- TubbaBlubba
- · Replies 15 ·
Helicopter flying around a square course
- giokrutoi
- · Replies 18 ·
How do I find mass in this equation?
- Saucetray
- · Replies 3 ·
Solve Moment Question: Find Force at Bottom of Ladder
- jckjmes
- · Replies 1 ·
Angle of Deviation in a Glass Triangular Prism Experiment
- Chirag Gupta
- · Replies 3 ·
What is the direction of energy transfer in polarised light?
- ravsterphysics
- · Replies 1 ·
Opamp RC-circuit -- Capacitor time constant calculation
- Abdulwahab Hajar
- · Replies 6 ·
How many maxima are visible in double slit diffraction with m=8.4?
- saybrook1
- · Replies 2 ·
Solving Cable Balance for T0 and T1
- wah31
- · Replies 8 ·
Shortest time to save the swimmer offshore (geometry) ?
- Vitani11
- · Replies 9 ·
Gravitational potential inside Earth integrating force
- Garlic
- · Replies 2 ·
An experiment using a diffraction grating with
- Hoyin
- · Replies 2 ·
Maupertuis's principle applied to gravity field
- zhouhao
- · Replies 5 ·
Minimum work required to put object into orbit?
- Bekamop99
- · Replies 10 ·
Finding Maximum Velocity in Train Motion
- Vitalii
- · Replies 5 ·
Why does changing R affect electric field in a photodiode circuit?
- instantresults
- · Replies 3 ·
Carnot engine efficiency problem
- Adriane Baun
- · Replies 3 ·
How Does Change in Velocity Relate to Vector Subtraction?
- ravsterphysics
- · Replies 8 ·
Mutiple choice about hydroelectric power plant
- Clara Chung
- · Replies 3 ·
Electron deflection between parallel plates: which distance for final velocity?
- LionLieOn
- · Replies 7 ·
How do I determine θ'' and tension in a speed-governing mechanism?
- EserRose
- · Replies 3 ·
Mech#3 on 1974 AP "C" Exam -- 2 Blocks Connected by a Spring
- jgebhardt
- · Replies 3 ·
Energy and power supplied by a bicyclist
- welssen
- · Replies 8 ·
How to Determine Angular Velocity of a Rolling Sphere on an Inclined Plane?
- cheapstrike
- · Replies 11 ·
What Is the Minimum Force Needed to Keep Two Blocks Stationary?
- doktorwho
- · Replies 1 ·
Finding Specific Heat of Unknown Metal
- a1234
- · Replies 3 ·
Parallel combination of capacitors
- Saint xavier
- · Replies 1 ·
How Can We Simplify the Algebra in Relativistic Elastic Collision Problems?
- yup790
- · Replies 3 ·
Archived Nonlinear Dynamics and Chaos, Strogatz: 2.1.5
- Niteo
- · Replies 4 ·
What is the distance and mass of a binary star system with given parameters?
- rockyleg
- · Replies 5 ·
Acceleration on the Moon: How Does Gravity Affect Objects?
- ravsterphysics
- · Replies 3 ·
Cart acceleration with rolling wheels and friction
- cheapstrike
- · Replies 8 ·
Mechanics - Work and Kinetic Energy, (Spring on a Ramp)
- hitspace
- · Replies 2 ·
Man on scale pulling rope through pulleys - check my tensions
- wah31
- · Replies 7 ·
Why does P = FV give the resistive force at constant speed?
- Kajan thana
- · Replies 6 ·
Venturi meter pressure difference
- pressurised
- · Replies 4 ·
Will the Steel Ball's Position Change When Water is Added to the Beaker?
- physicist007
- · Replies 20 ·
Understanding Absolute Viscosity - shearing stress
- Chadi B Ghaith
- · Replies 3 ·
Angle of electron in an electric field
- Drizzy
- · Replies 2 ·
Uniform plank resting on two supports.
- annanause
- · Replies 25 ·
How does center of gravity affect an athlete's jumping ability?
- ravsterphysics
- · Replies 3 ·
How much kinetic energy do I need to impart?
- fewme
- · Replies 12 ·
What are the effects of impulse and kinetic energy on two identical spheres?
- cheapstrike
- · Replies 12 ·
Deceleration distance over time
- Plebian
- · Replies 10 ·
Equations for Normal Forces at A and B: F_A + F_B = 0d * F_A - b * F_B = 0
- WesTech
- · Replies 1 ·
Maximum load on pine beam with safety factor of 5
- Neon32
- · Replies 1 ·
Calculation of torque to stop a wheel.
- cheapstrike
- · Replies 4 ·
Maximum potential energy after collision
- randomgamernerd
- · Replies 2 ·