Introductory Physics Homework Help Forum

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Free introductory physics homework help step by step from qualified mentors. Algebra and calculus based general physics homework. High school and undergraduate level.
How does thermal stress affect the length of a constrained rod?
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Tangent Angles for Lines of Force, Two Equal Positive Charges
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Understanding E subscript R Notation in the Context of General Relativity
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Would conservation of momentum apply in this vehicle accident homework problem?
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Volume's effect on buoyancy: Does pressure increase?
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Stokes' law and falling sphere method
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Magnetic field due to a long, straight wire
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Final Project (Matura Project) About The Wave Pendulum
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Troubleshooting Circular Motion: Solving the Toy Car Loop Puzzle
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A rope, a pole, and some tension
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Understanding Time Measurement in Physics: Uncertainty and Calculations
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What is the definition of a way and how does it relate to travel?
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What is the energy difference between the peaks in the Zeeman effect?
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How Do You Solve Equilibrium Problems Using Moments?
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Force between poles of two magnets
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Newton's shell theorem - all mass is concentrated at its centre
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Need help on some mechanics questions from a text book
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8
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775
Electromagnetic induction (Faraday's law)
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Balancing Torques and Forces on this Beam
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16
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Maximize Your Swinging Ball Force with These Expert Tips
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4
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912
Help about the unit vectors for polar coordinates in terms of i and j
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13
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Tangential acceleration of proton due to a changing magnetic field
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Does the Variable ##t## Represent Multiple Concepts in Physics Problems?
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Investigation regarding the rotor ride
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963
JEE solution wrong? (tempco of a clock)
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Pressure inside a sealed container
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Average velocity ##\bar{v}## for a uniformly accelerating particle
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Angular velocity of a loop after being struck by bullet
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Destroying a Building Using a Lens
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Irreversible isothermal Process Work External pressure not provided
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4
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830
Finding the focal length of a converging lens with VERY limited info
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A window cleaner holding his platform up with a rope and pulley
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Is enthalpy just the sum of internal energy and work against external pressure?
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Mistake in Exercises for the Feynman Lectures?
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2
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817
Finding Gauge Pressure in this Manometer
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Monkey accelerating up and down a rope
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Ways of transferring charge between objects (conduction and induction)
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What is the Relationship Between Restoring Force and Angle in a Pendulum?
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7
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How to define vectors in spherical coordinate system?
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For the friction formula when to use Fn(normal force)×mu and when F×mu
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17
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Why did I get two different results for the mass m2?
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Uncertainty principle if only one velocity direction is known
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Dead simple physics question (still a puzzle to me)
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Physics - electrostatic exercise with 4 charges at the corners of a square
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Finding the currents in this circuit (2 voltage sources and 3 resistors)
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Effect on visibility of thin films due to interference
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In which direction is the magnetic field at point P?
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Motion of Sphere Rolling Down Rotating Cone
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Calculate the voltmeter reading for this circuit with 2 sources and 2 resistors
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What is the net force on the current loop?
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Different forms of Stokes' theorem
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Wooden sphere rolling on a double metal track
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Mass on a spring from equilibrium
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Problem understanding solution of a question about a hydrogen-filled balloon
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Why body A has greater acceleration?
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Calculus Problem: Blowing Up a Spherical Balloon
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The phenomenon of the ruler trick
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Discover the Correct Star Radius with These Key Answers | Choose Wisely!
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Projectile Motion Question (Envelope of trajectories) query
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Viscosity by Falling Sphere Equations
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Parallel Axis Theorem Not Working
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Arrange bulbs in descending order of brightness
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Force field in spherical polar coordinates
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Actual Working of Weighing Machine (Normal vs gravitational force)
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Which Spring Constants to Use for Magnet Oscillation Experiment?
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How to Solve Dynamics Exercise Involving Force Representation?
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Matrices: a normal M, a projection Q, Hermitian transpose of product
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Does a signal called "EN" stand for something special in this circuit?
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844
How Does Dimensionality Affect Phonon Polarizations?
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Carnival Swing Question, I am severely stuck
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762
A charge inside a ring, small oscillation
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Importance/Use of Gauss' Law and Ampere's Circuital Law
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What are the voltages generated from this current source?
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Problem on Differential Pulleys
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Plot ##i_A## vs ##v_A## characteristics for this nonlinear network
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Distributed weight of inclined beam.
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What is the angle of static equilibrium for a ladder on ice?
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3
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Calculate the resistance to add in parallel to balance this bridge circuit
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Find the amount of work done against gravity in moving a 150kg rocket
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4
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What is the most effective nozzle size and water speed for maximum thrust?
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Finding electric potential of an infinite line charge at z axis
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Seeking advice on "simple" pendulum problem
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27
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Question about a problem from 'Optics' by Eugene Hecht
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Frequency of oscillations given 3 springs at angles ##\frac{2\pi}{3}##
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What is the power per square meter of a sun on a planet?
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Find the Retarding Force due to Eddy Currents
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Block on slope. Different answers using energy vs forces
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Why are the forces on torque tension and not the weight of the mass?
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Speed of ball on pendulum with Mechanical Energy
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Time period of SHM & Energy conservation in pulley-spring-block system
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Varying fluid (density) in a cylinder rolling along an inclined plane
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Torque before slipping in a refrigerator
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Friction between tractor tyres and the ground
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Does a massless string cause a normal force when attached to a wall?
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Vertical Velocity Graph versus Time on a Slope
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A particle moving in a parabolic path in the ##x-y## plane
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Finding current of circular (toroidal) solenoid
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Problem involving space elevators
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Calculate a radius of a circle on a screen
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Circular motion of a rollercoaster car on a loop-the-loop
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