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.
Work, Power and Energy — Lifting a coiled rope up off a surface
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Why Use Right-Handed Coordinates for Problem Solving?
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Does distance affect torque in hanging sign problem?
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Difference between scalar and cross product
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Why do we have a charge in the denominator of equation for voltage?
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Explaining the Cross Product for Two Vectors
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Finding linear acceleration of a spool and cable
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How to find Vmax squared for circular motion?
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Final velocity of a block on a spring pulled downhill
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Two masses on a rotating platform
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Estimates of voltage drop with distance in weak electric field
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The Work of Friction: Explained in .32m
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Why Is My Velocity Calculated Differently than the Solutions?
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Two black holes moving in a circular orbit around a point
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Why Does Positive Charge Exert Elec. Field Beyond Neg. Charge?
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Solving for 'a' with Torque, Force, and Mass Moment of Inertia
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Projectile motion problem – determining initial velocity of throw
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Sign hanging from massless beam attached to hinge supported by string
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Work done on a magnetic dipole (compass needle rotating)
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Surface Tension: Plate-Water Interface
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System of particles, impulse and conservation of angular momentum
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2 Capacitors and energy density
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Why are the three different surface tensions in the directions shown?
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I am stuck on a calculation -- Entropy change for a compound system
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Solving Fluid Statics Problem: Accounting for Atmospheric Pressure
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Volumetric flow of a overflowing cone
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How to Calculate Speed of Head of Driver After Collision?
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Understanding Destructive Interference in Radio Waves
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Mental Health During the COVID-19 Pandemic
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Can the positive direction be different for each particle in a system?
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Why can't I treat the disk as a point mass?
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Work and Energy for a mass sliding down a curved ramp (why does the ramp move?)
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Diatomic molecule at a constant temperature
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Find the acceleration of the system (2 blocks sliding on a table)
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Rotational motion magnitude question -- Rod mounted on a pivot
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Work greater than heat given to colder reservoir -- impossible?
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Energy/Power Question for pumping water out of a well
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Troubleshooting F = q v B sin(theta) Calculation
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A Guide to the Best Beaches in California
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Help Calculate Work Done in Adiabatic Process & Fill Table
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Waves- sending a pulse across a weighted line
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How much force does the 20 kg block exert on the 10 kg block?
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Physics project confusion (effects of length on a pendulum)
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Calculating Pressure in a Flowing Liquid
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What is the Correct Angle for Tension Force in Arm Mechanics?
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Two Particles Connected by Massless Rod: Dynamics Analysis
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Maximum angle reached by a cube placed inside a spinning cylinder
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Two vectors forming right handed set?
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Help understanding this velocity-time question
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What is the angular acceleration of the rod?
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Conservation of Momentum of Rocket Exploding after Takeoff
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Average Electric Field over a Spherical Surface
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Specific volume and enthelpy of mercury
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Calculating how many revolutions it takes to reach the final speed
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3 pulley problem with attached masses
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Net torque about an axis through point A in a massless rod
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How far will the bottom gate of a reservoir open?
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A dial can spin on a fixed rotational axis
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A box with the mass m = 25 kg is sliding up a hill
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What is the change in internal energy after two processes?
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A greater force? (A train engine pulling two identical cars)
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Distance travelled by a falling body
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Is the Work Done by a Variable Force Non-Conservative?
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For which case would the applied force be greater?
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Input & Output Explained: What Does It Mean & Why Is It Relevant?
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Hop height of a rod and speed/ time if hit upward with force f
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Power generated by this current source
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Force exerted on a pivot point of a rigid bar
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Thévenin and Norton circuits Exercise
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Inelastic collision followed by circular motion
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Calculate the angular momentum of this particle in rotational motion
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Capacitor Circuit Analysis: How to Find Voltage Across Resistors
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Calculate new RPM after change in g-force in a centrifuge
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Determine equivalent Young's Modulus
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Find the Electric field at point p
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Why is the Entropy of the Universe (total entropy) a path function?
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Find the charge of the sphere (q2)
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Approximating Glucose as an Ideal Gas: Can We Calculate Entropy?
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Feynman exercise - container with steel balls
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Initial Position Discrepancy Involving Fluid Resistance
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Newton's Laws of motion -- Bicyclist pedaling up a slope
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How to calculate magnetic induction just beyond the end of the magnet?
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Conservation of Energy with Mass on Hemisphere
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What is the smallest value of angular displacement of the raft?
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How does this system work? (Four pulleys and a rope lifting a mass)
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Degrees of freedom with a particle and a rod
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Can two objects moving parallel relative to a ground meet?
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What is the speed of the ball when it hits the ground?
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What is the difference between friction and rolling resistance?
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Determining a centripetal force proportionality equation
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Hydrostatic pressure at a point inside a water tank that is accelerating
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Why are the effects of a magnetized material neglected in this case?
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Finding COM of L-Shaped Rod and Ball System
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Solving Question through Inertial Frame: Challenges & Workings
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How are the poles of a tapered magnet distributed?
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Calculate the minimum force required
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How do I find the coefficients of static friction and kinetic friction?
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Conservation of momentum and mechanical energy on an inclined plane
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Problem on Parallel Plate Waveguide
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Four very long, current carrying wires in the same plane
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