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.
What is the perceived relative velocity of these two motorcycles?
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Lost in the Distance: Navigating Measurement
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Compute relativistic addition of velocities
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Force of water against a dam gate
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Magnetic field of a permanently magnetized cylinder
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How to determine Refractive Index without using the Refractive Angle?
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Change in heat and internal energy
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Finding Color of Two Lights Given Slit Source & Screen Distance
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Newton's 3rd law question -- A gun firing a bullet
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Magnetic field generated by a current in a wire - special relativity
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Equilibrium with the string in the center exactly horizontal
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Gravitational Potential In the Field Caused by Two Masses
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Motion in 2 dimensions -- Total displacememt of an ant walking
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Can Spacelike and Timelike Points Undergo the Same Transformations?
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Solving a collision question, is there enough information?
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Grade 11 physics and equivalent resistance
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Is the potential energy of an ion in a lattice ##U_0## or ##U_0/2##?
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Griffiths Quantum Mechanics Problem 1.18: Characteristic Size of System
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Electrical circuit problem (resistors, capacitors, inductors )
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Calculating Effective Coefficient of Thermal Conductivity
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Calculation on spontaneous fission and effect from alpha decay
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How Can I Analyze Particle Movement Given Potential Energy and Force Function?
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I'm not understanding how to calculate the magnetic field of a sphere
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Magnitude of the electric field?
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What is the potential energy of a system with N cubes at equidistant heights?
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Why is the direction in which the D.C. motor turns reversed here?
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Energy, work, power and efficiency when throwing a ball upward
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Work, Power, Energy, Efficiency
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Is ΔUL equal to ΔUR in this case?
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Dynamics of a double atwood machine
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Correct statement about telescopes
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What is the relationship between epsilon and sigma in multi-ferroic materials?
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Calculating Potential Energy from Force for Non-Linear Systems
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Strange question — Catapult launching a marble over an obstacle
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Centripetal force on a person on the Earth
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Question on problem 2.16 (a) of the Feynman Lectures (two-mass pulley)
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Fields in a capacitor before and after adding a dielectric layer
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Find the center of gravity of a combined cone and cylinder
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Hurricane forces — Comparing the force from a 60 mph wind to a 120 mph wind
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Thermal Expansion of a Triangular Frame
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Electric field of wire and cylinder at one point in space
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Finding the potential function of a vector field
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Moment of Inertia with varying distance from Centre of Mass
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Work done against resistive forces by comparing Ek and work done
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Existential dilemma on angular velocity of a complex rigid body
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Resistance Differences: Nichrome vs. Copper Wire
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Faraday's law -- How is the RHS required for all surfaces?
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Confused About Commas: Explaining Values & Usage
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Relationship between material mass and weight
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Gravity's Pull: How Far is the Proton Above the Electron?
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To find the weight of a hemisphere
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How Do Charges Separate on the Second Ball in Electrostatic Induction?
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Is this the default set up of a DC motor?
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Relativity of Length: Understanding Length Contraction & Time Dilation
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Momentum in different referance frames
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Vectors - Aircraft's velocity relative to ground
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Thermal Physics: Computer cooling
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Uncharged capacitors connected in series
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When Does the Amplitude Drop to 1/5 in Damped Harmonic Motion?
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Get the mass of an argon atom and its molecular weight from Cv
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Complex circuit and its resistance
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Why Does the Official Key State X=2.05 Instead of X=1 in This Adiabatic Process?
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Connecting two charged capacitors in series
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What should I consider when sketching a vector field?
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Is it true that a phone uses more energy than a refrigerator?
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Electric field between two parallel plates
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Accelerating Rockets in Different Frames of Reference
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Electromagnetism and the movement of particles
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Moment of inertia composite body
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Solving Vector Diagrams: Finding Displacements & Velocities
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How Do You Solve Equations with Variables V, U, and T?
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Modification of Wheatstone Bridge
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Expression for Electric Field Outside Sphere
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What would the angle φ be for this deflected laser beam?
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Question about equipotential lines and the work done moving along them
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Direction of forces on a uniform catilever
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Force on two cables holding a liquid-filled container against a wall
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Capacitor and Surface Charge Density Question
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Rod in equilibrium, and find its angle to the vertical plane
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Question about the Peak and Average Power of a Laser
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Which lamp is dimmed in the circuit?
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Resultant of two forces in two different situations
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Question about how to calculate the Resultant Force at this point
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Tension developed in a charged ring
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What Formula Do I Need for This Optics Problem?
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Determining the north and south pole of a solenoid
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Deflection of light passing the Sun
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Finding the magnitude of the moment on a pipe wrench
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Solving the Parabolic Motion Problem: A Sphere with Unusual Weight and Size
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Help calculating the current from the density and a rotating frame
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Is the Physics in the Avengers' Shield Collision Scene Accurate?
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Can Maglev Trains Be Used for Exercise?
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An electron enters a magnetic field
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Problems about magnetic field, electromotive force, induced current
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How do mass and radius affect gravitational pull on planets?
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Hydrostatic Equilibrium Problem Involving a Cube and two Liquids
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Question about a simple model for for back EMF
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Gravity and Orbital Velocity: Understanding a Common Misconception
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How Does a Positron's Kinetic Energy Change with Magnetic Field Strength?
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Relationship between closing a switch and the total battery current
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