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 significance of torque in the context of moment of force?
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States in the Hydrogen Atom that are not allowed
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Fluid Heights in an Open U-Tube
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What Determines the Number of Particles per Unit Volume in Ionized Hydrogen?
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Question about Statics problems involving frames
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What does the star mean in this table?
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Probability of electron in hydrogen nucleus for 1s and 2s wave-functions
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Velocity Formulas for Projectile Motion
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Circular motion to projectile motion
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SUVAT Problem: Box moving on inclined plane
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Consider three models of the Mass distribution in the Milky Way
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Olympiad dynamics problem with 3 masses and a pulley
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Momentum of ball on a pool table
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Going From EMF to Faraday's Law to find E-field in my HW problem
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How to find the forces in a particular framework of light rods
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What is the "r" in the moment of inertia?
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What mistake did I make in finding the reaction at hinge A?
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Force of the wall against the ladder is from static friction?
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Time taken to start pure rolling
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Trouble Understanding Hinge Axes: Ax ≠ Bx?
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Thermodynamics - Latent Heat Problem (finding mass)
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Newton's third law -- I have trouble with some real-life examples
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Forces when car wheels "lay rubber"
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Confused about applying the Right Hand Rule (RHR)
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A problem involving thin film interference
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Shear lines from a FBD with distributed forces
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Ball rolling down a slope problem: Find an expression for time taken
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Calculating final rotational speed from angular velocity
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Force and pressure -- Pulling apart two hemispheres with low pressure inside
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Calculating Inlet and Outlet Times: c=451.8, u=135.5
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Preventing a block from sliding down a frictionless inclined plane
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How to calculate distance traveled if you know a(v) graph equation?
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Finding time taken to stop a skater given mass, velocity and force
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Find largest potential energy difference between 2 loop orientations
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Optimal Solution for Avoiding Cable Slip from Groove
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Simple Ramp motion problem, but going full vector mode
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Work done by cord on the pulley
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Visualizing Series Bandpass Filters: A Graphical Approach
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Find the inertia of a sphere radius R with rotating axis through the center
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Finding the angle at the apex of a rhomb with incoming linear wave
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Conservation of energy -- Using a spring to launch a ball up an incline
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Euler-Lagrange equation: pulley system
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Some confusion about work done to separate charges
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Find the acceleration of the masses
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Special Relativity Muon problem
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Earth's magnetic force on a proton
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Question about radioactive decay
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Find the center of mass of a uniform semicircular plate of radius R
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Find the Potential energy of a system of charges
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Connection between Pressure, Surface Density and Height?
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Question about hollow matrix and diagonalization
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Find the current through a complicated circuit
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Adiabatic expansion with temperature-dependent gamma
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Fourier series, periodic function for a string free at each end
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How Do You Calculate the Mass of the Moon Using Surface Gravity?
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Finding Potential inside a hollow sphere
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Find the resistance of electrons in nanoshells
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Calculating Maximum Height: Confusion & Solutions
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Conservation of Energy for satellite in an elliptic orbit
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Determine how much energy the alpha particle carries
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Momentum Conservation: Bullet enters a block
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Solving Inequalities: Need Help with Part (a)?
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How do I calculate the work done by a force field using the dot product?
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Stable equilibrium and non stable equilibrium question in electrostatics
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HW Question regarding double-slit interference
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What is the resistivity of a wire when voltage increases?
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Find the drift speed of electrons in a wire
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Thermodynamic and mechanical work
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Heat Engine Efficiency: How Ice Water Affects Performance
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Understanding Velocity Transformation
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Roller coaster and centripetal acceleration
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What Is the Best Method to Calculate Gas Flow Through an Orifice?
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How Does Snell's Law Affect Wavelength?
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Potential difference of a ring rolling in magnetic field
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Velocity of two masses due to electric potential energy
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Tension in string pulling two carts
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What is the electric field inside an infinite cylinder?
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Calculating Magnetic Energy Between Plates
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Calculating Magnetic Induction of Moving Planar Condensator
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Question About an F=ma Problem with a small ball impacting a ramp
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Electric Field Inside a Gaussian Surface with Point Charge q
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Physics homework help needed -- A mass sliding down a ramp with friction
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Trouble with a Rocket Propulsion question (Variable Mass & Momentum)
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Specific heat in for the Otto cycle
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Surface charge density of a plane
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The occupation probabilities of electrons in different states
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Friction on a box in the bed of a pickup truck accelerating up an incline
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Voltage Confusion: What Am I Missing?
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Forces applied to a block on a ramp
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How Does Projectile Angle Affect Asymptotic Behavior in Physics Graphs?
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Forces on two different blocks with two pulleys
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Average speed question about a hovercraft
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Pulling down on the string connected to a whirling block on a table
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Calculating Electric Field at Point P(0,0'03,0'04)
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Pulley system to balance the weight of a person
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Potential on the axis of a uniformly charged ring
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Flux of the electric field that crosses the faces of a cube
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Ampere's Law -- What is the meaning behind each part?
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Boundary Conditions for an infinite rectangular pipe
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Why is my calculation for a rocket's maximum range incorrect?
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