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.
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Homework Help Guidelines for Students and Helpers
  • micromass
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Hey I posted in homework help but now it's gone
  • Mark44
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Homework Help: Introductory Physics Formulary
  • Doc Al
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Two balls, dropped with a delay of ##\Delta t##, meet after rebound
  • brotherbobby
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Great circle between two points on the Earth's surface
  • brotherbobby
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Apparent contradiction in a simple circuit
  • palaphys
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Simple kinematics problem — falling from a geostationary satellite
  • AlternativePhysics
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Newton's laws and inclined plane with friction
  • CURMC
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Why does a fan cool you in a sealed room if it adds heat?
  • sol_2001
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Field at a point on the axis of a ring with variable charge density
  • JesseAbberton
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The electric field inside an insulating infinite length solid cylinder
  • JesseAbberton
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What force causes precession?
  • test123
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Power of a thin lens in a medium is 1/fₘ or μₘ/fₘ ?
  • shubhamakshit
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Expansion or compression -- which is more energy efficient?
  • T C
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Cornering on a Smooth Surface
  • mangolucy
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If Heat Is Motion, Why Isn’t All Motion Heat?
  • sol_2001
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Finding potential difference in a circuit
  • songoku
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Paradox in Induced Dipole Forces: Does it violate Newton's Third Law?
  • EM-learner
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Semiconductor surface engineering
  • LUFER
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Why can’t we observe all regions of the universe?
  • Astro Santi
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Equal heat added to two spheres: why is the hanging sphere hotter?
  • sol_2001
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Newton's laws homework: inclined plane with pulley
  • akapm90
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A very simple moments question
  • physicals
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Simple Thermodynamics question: Temperature of water in a cup after adding cooler water to it
  • untilthecern
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Sliding block hits and compresses a spring
  • Antoha1
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Finding proper value for centripetal acceleration in a plane rising up
  • aadityav
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Simple problem with voltages
  • nickxyzt
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Slipping/Rolling Motion on Inclined Plane
  • michelp
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A practical way to determine geographical meridian
  • vcsharp2003
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Voltage that gives acceleration to relativistic particles
  • Antoha1
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Angle between two alpha particle tracks due to proton bombardment of a nuclei
  • Antoha1
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Which material will stop magnetic attraction?
  • songoku
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Physics Homework, conservation of momentum and relative velocities
  • wingding1
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Rotating difraction grid
  • phy_magic
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Spring aproximation
  • phy_magic
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Finding the acceleration of a block on an inclined plane with friction
  • Patrica87
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Doppler effect: why do I find this exercise so difficult?
  • mcastillo356
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U-shaped length of chain falling when one end is released
  • NTesla
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How is x-vt a rightward moving wave?
  • Jaccobtw
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Find the acceleration of a block (some sort of double Atwood machine?)
  • michelp
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How do I derive an expression for the velocity vector for any α?
  • griffith
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Difficulty understanding the reasoning behind constraint equations in mechanical systems
  • griffith
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Electric potential due to shell containing a charge at an offset outside
  • elex
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Working out the accelerations in a double Atwood pulley system
  • hmparticle9
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Correct statement about size of wire to produce larger extension
  • songoku
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Charge inside nested spheres
  • phy_magic
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Pressure difference between two points in a tapered pipe
  • I_Try_Math
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Magnitude of buoyant force in fluids of different densities
  • I_Try_Math
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Voltage vs Distance graph for a given E vs D graph
  • pgirl1729
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Correct statement about random process of radioactive decay
  • songoku
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Curving of gravitational field lines
  • pgirl1729
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Is it possible for a vertical rod balancing on a table to lose contact by striking the top of the rod?
  • Rob2024
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Bernoulli vs real life experiment
  • gen x
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Which one is correct statement regarding lightning?
  • songoku
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Cone on horizontal surface
  • phy_magic
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Chain falling out of a horizontal tube onto a table
  • NTesla
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Earthed plates confusion
  • tellmesomething
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2 pulleys 3 masses problems
  • phy_magic
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Force between two halves of a current carrying hollow cylinder
  • palaphys
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Two-layer dielectric, four-capacitor model vs three-capacitor model
  • mmfiizik
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Proof of law of sines using cross product
  • BelieverOf143___
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Magnetic field due to a coil wound on a hemsiphere
  • palaphys
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Falling capacitor connected to constant voltage
  • palaphys
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Decrease of amplitude in RLC circuit
  • Antoha1
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Coulomb's force vs the Lorentz force
  • Electrodude
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Cone Rolling on Conical Surface Dynamics
  • vvvlad
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Speed of moth related to Doppler Effect
  • songoku
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Struggling to make relation between elastic force and height
  • renobueno4153
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Correct statement about a reservoir with an outlet pipe
  • songoku
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Correct statement about siphon used to empty water tank
  • songoku
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Bullet collision question
  • imas_
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Confusion on sign convention in X-ray problems
  • palaphys
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Minimum height of water to make the particle visible
  • palaphys
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Ice cube in water: entropy calculation (Calorimetry)
  • Su6had1p
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Flux through a ring due to two charges
  • palaphys
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Static Mechanics: Aircraft Nosewheel Linkage Torque
  • jojosg
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Stacked blocks & pulley system
  • stunner5000pt
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Voltmeter readings for this circuit with switches
  • karim2360
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Formula for Electromotive force?
  • per persson
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Trying to understand the logic behind adding vectors with an angle between them
  • renobueno4153
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Rolling without slipping on a curved surface
  • NTesla
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A bead-mass oscillatory system problem
  • Zayan
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Problem about units conversion: cm^2 --> m^2
  • inuka00123
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Correct statement about movement of curve ball in a fluid
  • songoku
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Mechanics question: Three masses and a pulley on a tabletop
  • Zayan
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How to find eddy current (circular) path in this pendulum experiment?
  • microdosemishief
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Mechanics homework confusion
  • TomPag
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Why can I neglect angular momentum due to precession here?
  • infinite_sodium
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Egg Drop Challenge! Need ideas for winning designs
  • Addiep
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Multiple reflections in a mirror system
  • palaphys
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How fast is the fly's shadow moving?
  • goatedgolgi
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Struggling to understand the concept of this question (ice cube in water optics question)
  • murshiddreamengineer
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Electromagnetic field theory -- Potential inside a conducting sphere
  • per persson
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2 wires attached to another wire attached to a block
  • random124
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Phase relation between two waves
  • songoku
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Understanding Forces and their Vector Components
  • random124
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I've come across another fluid pressure problem I don't understand
  • vdance
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I need help making a relation between piezoelectricity and earthquake
  • SiddSha
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Variable mass system : water sprayed into a moving container
  • Su6had1p
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What Determines the Minimum Mass of a Block in a Collision Scenario?
  • Ishfa
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Adding and subtracting vectors using vector diagrams
  • Ishfa
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Electric field due to charges between 2 parallel infinite planes
  • Tesla In Person
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Sources for Physics Research Paper on Rotational Blade Motion on Helicopter
  • Rayla
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