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.
Trouble understanding the influence of a real spring in a system
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Is there an explanation for the unexpected increase in activity of Nuclide A?
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Kinematic Equations in Projectile Motion (this approach is not working)
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Coulomb's force - magnitude of the electric force
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Potential difference between two points in an electric field
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Calculating the velocity of a head-on impact between two suns
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How Does Deriving V = dW/dq Explain Voltage in Circuit Theory?
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Kinetic & Potential Energy of a Pendulum
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Question on sound intensity and dB
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Relationship between E and V in space
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Distance between rocket and object
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Roundtrip by Plane: Understanding Wind & Velocity Effects
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How does fringing of electric field help with boundary conditions?
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How does metal sphere determine the potential of the plane by symmetry?
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Single Loop Potential difference -- sign issue
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Find the unit vectors perpendicular to the given vectors
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Perfectly inelastic collision of two moving and rotating disks
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Question on Resolving Power of Diffraction Grating
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A bullet collides perfectly elastically with one end of a rod
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Is the work done by friction on a moving car's wheel positive or negative?
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How to prove that a force is conservative?
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"Doubling up" effect when pulling a chain on a table
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Compton Effect, angle of deflection
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A.C. power supply voltage amplitude questions
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Effect of temperature on vibrational frequency of a violin string
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Recognizing Thermodynamic Scenarious (Work Done)
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Why is the angular momentum negative in a disk and stick collision?
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How Does Lenz's Law Explain Magnetic Field Directions?
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How Does Rocket Ejection Mass Affect Its Velocity in Space?
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Glancing Elastic Collision Questionnaire
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What does 'dv and dx' mean in f = eta X A (dv/dx)?
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Modeling a kongming lantern (sky lantern)
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Glancing elastic collision, and center of mass
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Determine the velocity of a particle in mass spectrometry
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Is This Electromagnetic Theory Solution Correct?
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How Does the Direction of Normal Contact Force Affect Shelf Stability?
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Angular momentum of the particle about point P as a function of time
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Rolling without slipping down an inclined plane
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Tetherball rope wrapping around a pole
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V/I: Power from Potential Difference & Current
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Maximum angle made by rotating hinge with energy and gravity
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What are the forces at play in an elevator cab?
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Acceleration-Time Graph and Velocity Multiple Choice Question
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Finding the output V of a filter
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Unbalanced force to find altitude of airplane
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Does work = neg or pos change in potential energy?
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To find direction and magnitude of forces acting in a system
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Gravitational potential energy traveling from earth to mars
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Chimney effect and pressure difference
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Car that undergoes non-uniform circular motion
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I am calculating the forces on String cheese with net force = 0
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I am confused by the concept of space-time in special relativity
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Virial Theorem for an expanding globular cluster
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Why Doesn't the E*A Equation Work for Electric Flux in This Case?
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Calculate Crumple Zone Rigidty?
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Quick question about which radius to use on Gauss' law problem
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Finding ##x_c(t=0)## for a system of coupled Masses & Springs
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Calculate Principal Inertias - Exercise Hint
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Free body diagram for an inverted pendulum in the rolling sphere
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How to find deceleration up incline
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Question on Einstein's opening passage of relativity
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Initial acceleration problem: Two children on a frictionless floor
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Electric field due to a charged infinite conducting plate
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Ball rolling down a slope ending with a loop
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Torque imposed by the Moon and Sun on the Earth given its precession
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Falling and sliding stick (David Morin)
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Projectile Motion Experiment: Results Too High?
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Spring compression -- Ball colliding with a spring-mounted platform
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Why momentum of a ball bounced off a wall increases twice fold?
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Propagating Uncertainties in acceleration when using a video software
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How Is the Second Leg of the Triangle Calculated in Vector Problem?
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Gauss's Law for a sphere with a cavity, solving for E(r)
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1D Elastic Collision between an Elephant and a Fly
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Ball on a string (vertical circle)
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Find frequency such that two components have same average power
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Quartic function of a non-ideal spring
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Where is the equilibrium point of a mass sliding down slacking cord?
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Why bulbs and LED diodes keep glowing after being switched off?
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Magnitude of force acting on wedge and block
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The Quantum Uncertainty of a Particle
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To locate the centre of gravity of a rod
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RL circuit after switch has been opened
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Equivalent Capacitance and Resistance of this Circuit
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An introductory question about special relativity
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Newton's second law (My turtle named Newton being accelerated)
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Is the Spring Launching Equation Correct?
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Finding Spring Constant When Given Amplitude, Time, and Mass
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Particles moving on a regular hexagon
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How Does Torque Affect the Motion of a Disc Pulled Across a Table?
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To find the distance of a horizontally suspended rod from a ceiling
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Energy Efficiency Tips for Homeowners
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Electric force due to a moving charge
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Trajectory of a charged particle in the magnetic field (variable)
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Equation calculations about the coefficient of kinetic friction
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Action Reaction Spring Scale Question
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Wrong sign in my answer, why? SR + Addition of velocity....
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Help Me Solve This Khan Academy Question: Friction and Initial Velocity
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Is Throwing a Knife with No Spin Actually More Effective?
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An object oscillating in simple harmonic motion
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Why Does a Wheel Move and How Does Torque Influence Its Dynamics?
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