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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Why does circuit with two resistors last twice as long if both have same battery?
- pivoxa15
- · Replies 8 ·
How Does Wattage Affect Rowing Performance and Energy Costs?
- pharaoh
- · Replies 4 ·
Force created from kinetic energy
- pantsik
- · Replies 7 ·
Ocean swimmer 5km from coast with N70E lighthouse bearing
- pivoxa15
- · Replies 2 ·
Yearly Income from 2.12E9 W of Energy at 1.8 Cents/kW-hr
- Rasine
- · Replies 3 ·
Source for HARD Dynamics problems?
- stinlin
- · Replies 4 ·
Final temperature when 3.0kg gold at 99°C is dropped in 0.22kg water at 25°C
- ch3570r
- · Replies 6 ·
Heat engine run in reverse to freeze water at 0°C
- kbyws37
- · Replies 1 ·
Capacitor and resistor in a flowing liquid
- Saketh
- · Replies 4 ·
What is a "g" for electric fields?
- Malicious
- · Replies 3 ·
Calculate Engine Efficiency: 0.490 kJ of Heat for 0.120 kJ of Work
- kbyws37
- · Replies 2 ·
Calculating Speed of a Block on a Spring: Friction vs. No Friction
- brunie
- · Replies 4 ·
Very basic current direction question
- Jacob87411
- · Replies 6 ·
Difference in Potential and Resistance in Series Circuits
- demode
- · Replies 9 ·
Magnetic Fields, Current, and Tension
- twotaileddemon
- · Replies 21 ·
Understanding d and Δ in Integration
- cheez
- · Replies 2 ·
Learn About Refraction of Light Experiment
- jnimagine
- · Replies 3 ·
Normal force on a 510 kg roller coaster at point A
- tnhoots
- · Replies 2 ·
How much ice must melt at 0 deg. C to gain 6 g of mass?
- PhyzicsOfHockey
- · Replies 5 ·
Current in DC Circuit: 8.41 x 10^19 Electrons in 2s
- jst
- · Replies 5 ·
What is the Equation for Current as a Function of Time in a Circuit?
- jst
- · Replies 2 ·
Increasing current by a factor of 48
- jst
- · Replies 2 ·
Polarising effects from plastics
- chinde
- · Replies 2 ·
Flunked this test correct answers needed
- missy28
- · Replies 1 ·
How will a capacitor influence a lightbulb?
- Dart82
- · Replies 3 ·
Electromagnetism - Lorentz Force
- Asrai
- · Replies 3 ·
Max and Min Forces for Non-Slip Block on Inclined Wedge
- bassplayer142
- · Replies 8 ·
How much ice must melt at 0 deg. C to gain 5 g of mass?
- jimmypoopins
- · Replies 3 ·
Angular Acceleration of a Moving Wheel
- underoathP
- · Replies 1 ·
Electric Field and an Uniformly Charge Plastic Pipe
- Swagger
- · Replies 6 ·
What is the minimum tension needed to fully straighten a rope under weight?
- Rainbow
- · Replies 6 ·
Calculating Minimum Radius for a Stunt Plane Dive
- nitro2109
- · Replies 3 ·
Ice cooling tea from 30.1°C to 27.3°C
- Aikenfan
- · Replies 1 ·
A couple resistance/power problems
- feelau
- · Replies 3 ·
Find the Current of a circuit, all you are given is P= .4W
- jdub88
- · Replies 2 ·
A little question causing big problems
- Tido611
- · Replies 1 ·
Calculating Force Between Two Conducting Spheres
- 8parks11
- · Replies 5 ·
What Is the Distance of Closest Approach in a Particle Collision?
- Tido611
- · Replies 1 ·
Direction of field inside and outside a magnetic dipole
- Amith2006
- · Replies 1 ·
How do you find F without the second Mass?
- jdub88
- · Replies 3 ·
An Ice Cube is Added to a Thermos of Coffee
- justine411
- · Replies 3 ·
Basics of quintic and quadratic expressions
- runicle
- · Replies 1 ·
Understanding Molecular Motion: Diffusion of Phospholipids in Bacteria
- SUchica10
- · Replies 1 ·
Why do parallel wires with identical currents attract each other?
- hiljd
- · Replies 3 ·
Wavelength of light in photoelectric effect with sodium
- MrDMD83
- · Replies 5 ·
A gun that fired charged particles
- Dart82
- · Replies 2 ·
Quick Current and Resistance problem
- Omat128
- · Replies 3 ·
What is the Correct Force to Move a Package Up an Incline?
- srh
- · Replies 1 ·
Force to accelerate an electron and power for loaded elevator systems
- KraYzie
- · Replies 5 ·
Probing Atomic Nuclei with Electron Scattering.
- stylez03
- · Replies 5 ·
Estimate Mass H2O Vapor in 1 m^3 Air at +20°C
- Orbital
- · Replies 2 ·
Solve Kinetic Questions - 2 Examples
- Peach
- · Replies 8 ·
Find Electric Field of 0.965nC Insulating Sphere Above -7.90 nC Sheet
- stylez03
- · Replies 16 ·
Why momentum and energy give different bullet speeds after plastic collision
- vadbol
- · Replies 4 ·
What is the objects velocity when it hits the earth
- martine80
- · Replies 12 ·
Interesting problem - movement of dialectric
- JamesTheBond
- · Replies 1 ·
Two Fairly Basic Thermodynamics Questions
- jimmypoopins
- · Replies 1 ·
Current from two parallel batteries with no resistance
- map7s
- · Replies 1 ·
How Long Does It Take a Crane to Lift a Load to Maximum Velocity?
- tattersfield
- · Replies 5 ·
Deriving Simple Harmonic Motion Equations
- akj
- · Replies 3 ·
Homework Problem: How to solve a projectile problem with given information?
- luvsk8ing
- · Replies 2 ·
NONUNIFORM Vol. Charge Density - V at the center of sphere
- JamesTheBond
- · Replies 3 ·
Speed of ball leaving spring gun with friction force
- Peach
- · Replies 7 ·
Maximum angular frequency for two blocks on a spinning turntable
- nahya
- · Replies 13 ·
Assistance required for following
- faisal
- · Replies 4 ·
Magnetic field strength and SHM
- debwaldy
- · Replies 1 ·
Solving for Velocity Vector Angle of 45.0
- blufoggy
- · Replies 6 ·
How Do Divers Calculate Impact Velocity and Maximum Height Reached?
- RKNY
- · Replies 5 ·
How Does Increasing Plate Separation Affect Capacitor Energy Storage?
- map7s
- · Replies 5 ·
Constructive interference of two sound waves with given intensities
- ryanjdiaz
- · Replies 1 ·
How Does Equation (1) Translate to Equation (2) in Simple Harmonic Motion?
- Behroz
- · Replies 3 ·
Sketching Electric Field Patterns for Charged Objects
- AznBoi
- · Replies 14 ·
Finding maximum contact force for tennis ball bouncing off wall
- saralsaigh
- · Replies 5 ·
How High Can a Motor Lift a Mass Using a Charged Capacitor?
- map7s
- · Replies 3 ·
How can Kirchoff's rules be used to determine current values in a circuit?
- Azndude51
- · Replies 5 ·
Energy used by a CD player, and height in mgh
- map7s
- · Replies 7 ·
Current through a cell membrane with given potential difference
- map7s
- · Replies 1 ·
Friction Problem: Calculating Acceleration and Tension in a Pulley System
- vntraderus
- · Replies 1 ·
Will the Block Move and What is Its Acceleration?
- vntraderus
- · Replies 1 ·
Angle between vectors and spring constant for car crash
- kp87
- · Replies 3 ·
Understanding Resistance and Temperature in Electrical Circuits
- feelau
- · Replies 5 ·
Lighting a Banquet Table: Series vs. Parallel Circuits
- dmolson
- · Replies 5 ·
Solve 10.0 µF Capacitor Problem: Find Value of C
- SamTsui86
- · Replies 5 ·
Yo-Yo Question - Rotational motion/angular momentum
- admanrich
- · Replies 1 ·
Calculate Neutral Electrons for Aluminium Nail
- Salerk
- · Replies 7 ·
How Fast Does a Rock Fall on Jupiter?
- Coastal
- · Replies 4 ·
Box sliding off accelerating truck: when does it fall off?
- Peach
- · Replies 7 ·
Did my tutor give an incorect equation?
- Salerk
- · Replies 6 ·
How Do You Calculate Pool Depth Using Refraction Principles?
- physicsstudent14
- · Replies 3 ·
Angular momentum question (from kleppner's book).
- MathematicalPhysicist
- · Replies 2 ·
Troubleshooting Multiple Optics Problems: Finding the Final Image Location
- asd1249jf
- · Replies 2 ·
What drain diameter for 2.8 m³/h from a pressurized cylindrical tank?
- wat
- · Replies 2 ·
Newtonian mechanics - extended rigid body's rotation, moment of inertia
- puipui_queen
- · Replies 1 ·
What is the internal energy of air in a room at 20˚C?
- tom_robinson1
- · Replies 4 ·
How Deep Does the Fish Appear in the Tank Mirror?
- asd1249jf
- · Replies 2 ·
Flywheel, rotational mechanics problem
- mrdonkey
- · Replies 1 ·
Y-component of Electrostatic Force
- vg19
- · Replies 1 ·
Finding electric field direction and charge for falling bead
- AdKo
- · Replies 16 ·
Why do we feel lighter when accelerating on a bike downhill?
- freswood
- · Replies 3 ·