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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Speed of a sphere fired straight up, including quadratic air resistance
- soundbyte
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Why doesn't the space pod move when astronauts take their seats?
- xplosiv
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Solve Quarry Crane Problem: Find Rope 2 Tension
- yandao87
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Force of an electron with magnetic and electric fields and velocity
- shadowtracker
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Solve Rotation Problem: Wheel w/ 8 Spokes & 30cm Radius
- ChazyChazLive
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Calculating the magnitude of the force on an electron
- jaa72
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Help with change in internal energy for a real system.
- guitarguy1
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How Does Doubling a Satellite's Mass Affect Its Orbital Speed and Stability?
- nns91
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Electricity and Magnetism questions Gauss's law, groundingetc.
- mmmboh
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Why Does Adding Harmonics Not Change the Period of the Fundamental Wave?
- johnj7
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Solving Two Point Charges: Calculating Electric Field
- seanmcgowan
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How much torque must the pin exert to keep the rod from rotating?
- nweis84
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Simple problem in calculating kinetic energy
- Laurlaur790
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Time dilation: period of a clock
- ephedyn
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Lenz's Law - Induced Magnetic Field/Current
- pujam3
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How Do You Calculate the Capacitance of a Capacitor?
- RedBarchetta
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Determining Force & Direction of 6 kg Particle's Motion
- soul5
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Max acceleration of car up ramp
- diffusion
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Electrical Potential Difference between two plates
- coolgirl
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Ultracapacitors - How long until the potential difference drops to 6V
- idk11
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How Much Work Is Needed to Stretch a Spring from 12 cm to 16 cm?
- magma_saber
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Speed bump question - Newton's laws
- feveroffate
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Two conceptual questions regarding Newton's laws
- feveroffate
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Acceleration with position given
- silentsaber
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Moving wires in magnetic field/force
- pujam3
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Momentum and work energy question
- nugget
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How Do You Calculate Voltage Drop in a Copper Wire?
- zyphriss2
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How Do You Solve These Complex Circuit Problems?
- clairez93
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How Does Friction Affect the Movement of a Book Up a Sloped Surface?
- vorcil
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How Do You Calculate Acceleration in a Free Fall Scenario?
- cire792
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Correct Formal Equation (Force due to a Spring)?
- PFStudent
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Questions about centripetal force
- sheenu32
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Calculate Electric Field at Origin 0 - $\lambda, \vartheta, R$
- afm-91
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Momentum Conservation in a Swapping Chair Scenario in a Spacecraft
- nugget
- · Replies 3 ·
Thermodynamics Entropy +2nd law problem
- physstudent1
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How Is the Electric Field Value Estimated in a CRT Deflection Scenario?
- DLK
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Determine the radius of the electron's orbit
- afm-91
- · Replies 25 ·
Show that terminal velocity equals
- wayneinsane
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Find position, magnitude, and direction
- wayneinsane
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How Do You Calculate Forces on a Car Traveling on a Banked Curve?
- nugget
- · Replies 1 ·
Determining the time it takes to reach half of a penny's terminal speed
- aquirk
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Car on an incline, friction related question
- nugget
- · Replies 3 ·
Some serious help needed in thermodynamics
- rock.freak667
- · Replies 1 ·
Interference fringes between rectangular pieces of glass
- Yroyathon
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What is the Light Intensity 3 Meters from the Bulb?
- dewdrop714
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Block and cylinder down an incline
- vladimir69
- · Replies 15 ·
How Much Ice Was Added to Cool the Lemonade?
- chops369
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Electric field from a line charge and spherical shell with Gauss's law
- mmmboh
- · Replies 10 ·
Moment of inertia and velocity of an object
- Silentblade
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Resultant and normal force of car on banked curve
- diffusion
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What Are the Initial Speeds of Two Cars After a Rear-End Collision?
- Nikolan
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Explosive Particle and momentum
- TFM
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Work and kinetic energy of stretched spring
- silentsaber
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Capacitors Connected, Disconnected, and Connected Again
- ---
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About Quarks - How Big is One?
- cAoCdDyC
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Displacment in simple harmonic motion after periodic time
- madah12
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Do Friction Forces Exist Between a Rod and a Shaggy Bowl?
- zasdfgbnm
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Find Optimum Angle of Launch: Calculate Velocity of Ball from Catapult
- monkeyguy31
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How Does Angular Momentum Affect Merry-Go-Round Speed?
- makeAwish
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Solving Argon's Turbine Expansion Problem
- zandbera
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HW Question, very simple. mass/gravity
- ek378996
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Calculate Refraction without Snell's Law?
- deadendcustom
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Why Doesn't Total Mechanical Work Equal the Sum of All Work Values?
- scuroangel66
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Building a hovercraft, having an issue with finding center of mass
- mxyplizk
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What Is the Tension in the Right End Cable of Scaffold 1?
- peaceandlove
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Quesiton on Newtons Second Law, Need Help.
- yunuscanemre
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Collisions+momentum+energy experiment
- Atlaπtis
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Work & Vectors: Finding Force Work from Point to Point
- silentsaber
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Energy transfer from x altitude to geosynchrous altitlude
- tnutty
- · Replies 15 ·
Two Blocks Sliding, Newtons 3rd
- myxomatosii
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Finding α for F=F1+F2+F3 to be Parallel to AB
- Dell
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Simple Pulley Ratios: Find T1, T2, T3, T4, T5, F
- myxomatosii
- · Replies 15 ·
Finding resistor R with voltage 5.0V and current 62mA
- Phoenixtears
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Calculating Time and Forces with Frictionless Surfaces
- zell_D
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Parallel-Plate Capacitor Question
- Lovergoo
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Friction Formulas: Fn, Ff & Mu w/ D, T, A, Vi & Ramp Angle
- Lobber
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How do i find electric field of a sphere?
- Dell
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Maximum refractive index of liquid on 30-60-90 prism for total internal reflection
- marpple
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What is the Maximum Kinetic Energy of a Rotating Rigid Rod System?
- makeAwish
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Rank Magnitude of Torque for Forces A-F on Wrench
- makeAwish
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Normal Forces on a Ferris Wheel: Is the Top or Bottom Greater?
- Dannystu
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Max \omega for Stationary Bar on Prism 1 with Coeff. k < cot\alpha
- sArGe99
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Calculating Maximum Kinetic Energy in a Flywheel
- makeAwish
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Proof of Cosine law using vectors
- Andrewlorenzo
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Measuring the coefficient of friction
- Lobber
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How Do I Solve for Variables in the Combined Gas Law Equation?
- stasik50
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Does Mass Affect Friction in a Pulley System?
- tnutty
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Maximizing Motorcycle Jump Height: Solving for the Optimal Speed
- ymehuuh
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From what height was an object dropped?
- ymehuuh
- · Replies 3 ·
Is the Focal Point of a Concave Mirror Always Positive?
- afcwestwarrior
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Fundamental frequency and higher harmonics
- johnj7
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Calculating Work Done by Force on a Block
- lauriecherie
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The Change In Gravitational Potential Energy?
- Scray XXI
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Why Does Increasing Weight Decrease Acceleration in a Pulley System?
- tnutty
- · Replies 1 ·
Radii of Curvature for Separating CO2 with 12C and 14C
- negat1ve
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Current Carrying Wire Magnetic Field Deflection Direction
- negat1ve
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Maximum acceleration up ramp
- diffusion
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Moment of Inertia for Hexagon w/ Point Masses & Length 7 cm
- hellothere123
- · Replies 4 ·
Solve Farm Gate Problem: Horiz Force on Bottom Hinge
- xRandomx210
- · Replies 4 ·
How Do You Calculate Induced Current in a Coil with Changing Magnetic Field?
- phy112
- · Replies 1 ·