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.
Gauss' law for charge distribution of a point charge at the origin surrounded by an insulating sphere
  • BlondEgg
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Mass atop four springs with external input: Reduce vibration amplitude by factor of ten
  • zenterix
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What mass must be placed on the cord to keep the pulley from rotating?
  • I_Try_Math
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Ratio of volumes in a vertical cylinder with a piston
  • danut
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3
Estimating damped harmonic oscillator parameters from this plot of the oscillations
  • zenterix
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9
A rod that falls while rotating from the end of a table
  • Kim Gi Hyuk
  • · Replies 11 ·
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11
Question about Projectile Motion: Throwing a Flower Pot from a Balcony
  • cherryLoop
  • · Replies 18 ·
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18
Doubt regarding View factor/shape factor of infinite inclined plate
  • harsh_23
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3
The speed of the point of intersection of two uniformly moving lines
  • brotherbobby
  • · Replies 24 ·
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Theoretical velocities at different heights sliding down an inclined plane
  • helloworld2941
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4
How to determine if electrical components are connected in parallel or in series?
  • kirito
  • · Replies 10 ·
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Electric flux through an inclined cylinder
  • Zayan
  • · Replies 16 ·
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A charge q approaching two stationary charges q1 and q2
  • Heisenberg7
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7
Analyzing this 2-lens optical system
  • malolapjk
  • · Replies 5 ·
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5
Charge conservation for 3 parallel charged plates
  • tellmesomething
  • · Replies 19 ·
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19
Force transmitted to a block in viscous fluid through a spring, cord, and pulley
  • zenterix
  • · Replies 6 ·
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6
Two Inverted Pendulums connected by a rope
  • Deegee
  • · Replies 10 ·
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10
Gauss' law problem -- Should the field due to both the inside and outside charges be taken into account?
  • tellmesomething
  • · Replies 28 ·
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28
Help finding the change in potential energy in this problem
  • AJII
  • · Replies 9 ·
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9
Textbook 'The Physics of Waves': Linearity of Forced Oscillator
  • brettng
  • · Replies 6 ·
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6
Induced currents on a pair of separated dipole antennas
  • yefj
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2
Thermodynamic cyclic process - 2 isobaric and 2 adiabatic
  • Thermofox
  • · Replies 5 ·
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5
Ball launched from a height of 5 meters --- Projectile motion
  • Thermofox
  • · Replies 12 ·
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12
Block on top of an inclined plane, with a rough surface, that moves with constant acceleration
  • Thermofox
  • · Replies 41 ·
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Energy analysis of the system (leaking bucket from Morin's "Mechanics"
  • Michael Korobov
  • · Replies 5 ·
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5
Textbook 'The Physics of Waves': Lifetime of SHM Oscillators
  • brettng
  • · Replies 5 ·
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5
Textbook 'The Physics of Waves': Calculating Work Done by Force
  • brettng
  • · Replies 2 ·
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2
Textbook 'The Physics of Waves': Reason to force us to consider complex solution for harmonic motion?
  • brettng
  • · Replies 3 ·
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3
Is there a limit on how much energy a photon might have in a FOR?
  • Aurelius120
  • · Replies 10 ·
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10
How to parametrize motion of a pendulum in terms of Cartesian coordinates?
  • zenterix
  • · Replies 1 ·
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1
Is the line integral of tangential force in pendulum equal to the negative of change in potential energy?
  • zenterix
  • · Replies 3 ·
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3
What is meant by small oscillations for this potential energy function?
  • zenterix
  • · Replies 2 ·
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2
Initial velocity of bird landing on horizontal wire modeled as spring
  • zenterix
  • · Replies 7 ·
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7
Circular motion of a Weightless rod
  • PitViper
  • · Replies 18 ·
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18
Electric field of point along the central vertical axis of a triangle
  • Samir_Khalilullah
  • · Replies 3 ·
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3
Proving Newton's 3rd law from conservation of momentum
  • Quantum55151
  • · Replies 2 ·
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2
Finding speed of two billiard balls in elastic collision
  • I_Try_Math
  • · Replies 9 ·
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9
Electromagnetism - Infinite plane of charge & Tension
  • thejuanestevez
  • · Replies 9 ·
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9
Measurement of the Stefan-Boltzmann constant
  • MatinSAR
  • · Replies 6 ·
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6
Why is the superposition principle valid here?
  • tellmesomething
  • · Replies 5 ·
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5
Morin 3.7 -- Block sliding sideways on an inclined plane
  • masteralien
  • · Replies 11 ·
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11
How Do Mass and Weight Differ?
  • Quantum55151
  • · Replies 29 ·
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29
Equivalence of Euler-Lagrange equations and Cardinal Equations for a rigid planar system
  • l4teLearner
  • · Replies 4 ·
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Rotating simple harmonic oscillator
  • kekpillangok
  • · Replies 11 ·
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11
Deriving speed equations | Elastic collision
  • I_Try_Math
  • · Replies 1 ·
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1
Force analysis of a spring-bob system
  • tellmesomething
  • · Replies 2 ·
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Block on top of moving slab, with a rough surface - When does v_b=v_s?
  • Thermofox
  • · Replies 27 ·
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Impulse and perfectly inelastic collision between 2 points
  • Thermofox
  • · Replies 4 ·
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4
Conservation of energy of a bow and arrow
  • Sam Jelly
  • · Replies 3 ·
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3
Stretched spring attached to the center of a pure rolling disk
  • Thermofox
  • · Replies 11 ·
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11
What is taken as datum level for the following absolute potentials?
  • tellmesomething
  • · Replies 2 ·
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Applying Force on a Cylinder at an Angle
  • Heisenberg7
  • · Replies 8 ·
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Free Body Diagram of Mass-Spring System
  • chaneth8
  • · Replies 5 ·
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Conservation of Mechanical Energy - Which Equation To Use?
  • chaneth8
  • · Replies 9 ·
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Closest distance of approach between 2 charged particles
  • Heisenberg7
  • · Replies 5 ·
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5
System of two wheels of different sizes with an axle through their centers
  • Aurelius120
  • · Replies 67 ·
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Change in Entropy When Mixing Water at Different Temperatures
  • domephilis
  • · Replies 5 ·
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Question About Momentum: Ball Rolling up a Curved Ramp
  • chaneth8
  • · Replies 12 ·
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Homer Simpson spinning inside an hourglass
  • ajejebrazorf
  • · Replies 4 ·
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4
Resultant force on a parachutist
  • Quantum55151
  • · Replies 11 ·
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11
A moving boat with a flag on its mast
  • brotherbobby
  • · Replies 15 ·
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15
Calculating work done by a gas
  • hraghav
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Length Contraction Problem for a Rod in a Spaceship
  • Skyxplorer
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4
Perfectly inelastic collision between Projectile and a hinged disk
  • Thermofox
  • · Replies 26 ·
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Moving charge deflected by a loop of wire
  • TimeBender2004
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Theory of relativity -- Car and Garage Paradox
  • Groovy2
  • · Replies 13 ·
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Maximum allowable value of a force
  • Mohmmad Maaitah
  • · Replies 5 ·
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Conservation of Momentum Problem - Mechanical and Kinetic Energies
  • Ascendant0
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2
Dynamics of a Block on top of a slab with friction between them
  • Thermofox
  • · Replies 33 ·
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Find the Period of Oscillation for a Mass Falling Through a Tunnel Through the Earth
  • NTesla
  • · Replies 7 ·
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7
Textbook 'The Physics of Waves': Derive Complex Solution Form for SHM
  • brettng
  • · Replies 6 ·
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6
Is it friction or tension acting on the person hanging on a rope?
  • aiqing
  • · Replies 4 ·
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4
Could someone help me study this cyclic process of an ideal gas?
  • Thermofox
  • · Replies 35 ·
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Spherical ball rolling back and forth in a bowl
  • zenterix
  • · Replies 24 ·
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24
Determine the force with which the magnetic field of a coil acts on an infinitesimal cube of iron
  • withoutname
  • · Replies 6 ·
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Speed of charged balls after collision
  • Bling Fizikst
  • · Replies 13 ·
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13
Electric Field of a quarter ring
  • Zayan
  • · Replies 3 ·
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3
Maxwell disc linked to bar unwinds but stays at same height by raising bar
  • zenterix
  • · Replies 2 ·
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Gauss' Law with a Insulating Shell
  • PenDraconis
  • · Replies 4 ·
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4
Induced EMF in a rotating ring
  • gochaka
  • · Replies 14 ·
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For what values of total energy is the resulting motion periodic?
  • dark_matter_is_neat
  • · Replies 25 ·
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Why are moments not included in free body diagrams?
  • per persson
  • · Replies 31 ·
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Ruler measurements and knowing how many decimal places to include
  • flintstones
  • · Replies 9 ·
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9
Energy analysis of this system (curved ramp up and a spring)
  • Thermofox
  • · Replies 29 ·
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29
Dispersion of rightward steps in 1-D random walks
  • f3sicA_A
  • · Replies 3 ·
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3
B-field from a current in a wire above a conducting surface
  • Sidsid
  • · Replies 1 ·
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1
Determining impulse given stopping distance and change in velocity
  • I_Try_Math
  • · Replies 6 ·
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6
Special Relativity: spaceships heading toward each other
  • Sidsid
  • · Replies 7 ·
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7
Quantum Mechanics - Time dependent solution - x's and t's not mixed up
  • laser
  • · Replies 2 ·
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2
Torques acting on a cylinder, with friction
  • pedro_crusader
  • · Replies 1 ·
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Block connected to 2 real pulleys
  • Thermofox
  • · Replies 18 ·
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Manned spacecraft to Tau problem
  • member 731016
  • · Replies 5 ·
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5
Events occuring in 4D spacetime
  • member 731016
  • · Replies 1 ·
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1
A rod sliding/falling down on a frictionless horizontal plane
  • Sam Jelly
  • · Replies 8 ·
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8
Why is a 1d conservative force approximately linearly related to position?
  • zenterix
  • · Replies 3 ·
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3
Finding magnetic field using Ampere's Circuital Law
  • arham_jain_hsr
  • · Replies 5 ·
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5
Is My Understanding of Accelerations in Irodov 1.258 Correct?
  • adjurovich
  • · Replies 14 ·
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Two masses connected by Pulley - Lagrangian problem
  • member 731016
  • · Replies 6 ·
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6
Trying to Calculate Initial Velocity and Final Velocity
  • rosephysics
  • · Replies 2 ·
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Colour depends on wavelength or frequency?
  • NTesla
  • · Replies 22 ·
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