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.
How Long Does It Take for a Collapsing Interstellar Cloud to Heat Up by 800K?
  • CAF123
  • · Replies 28 ·
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28
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6K
What is the Angular Momentum of a Spinning Disk Subject to Applied Forces?
  • postfan
  • · Replies 10 ·
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10
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4K
Elastic collision between rod and ball
  • tilaib
  • · Replies 2 ·
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2
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3K
Iron ball hanging from a scale and suspended
  • UnD3R0aTh
  • · Replies 1 ·
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1
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1K
Angular Momentum of Point Masses
  • postfan
  • · Replies 26 ·
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26
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4K
The moment of inertia of a rectangular plate about its diagonal
  • Outrageous
  • · Replies 8 ·
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8
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36K
Experimental Physics Report - Unexpected Results
  • Tantalum
  • · Replies 3 ·
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3
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2K
Solve FBD Problem: M.asinθ=N, N.sinθ=Ma
  • hav0c
  • · Replies 8 ·
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8
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2K
Choice of reference potential in electrostatics
  • Vibhor
  • · Replies 11 ·
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11
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2K
Dropping objects air resistance
  • Big-Daddy
  • · Replies 1 ·
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1
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2K
Circuit - how much voltage is going through R3?
  • STEMucator
  • · Replies 1 ·
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1
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1K
Understanding Reflective Radiation Pressure
  • rodriguez1gv
  • · Replies 3 ·
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3
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5K
Magnitude of magnetic fields of two perpendicular wires
  • 808techgeek
  • · Replies 3 ·
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3
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27K
Diverging lens problem -image should be between focus & optical centre
  • s3a
  • · Replies 5 ·
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5
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2K
Optics - Find the refractive index
  • Saitama
  • · Replies 32 ·
2
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32
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5K
Electromagnetism and light bulbs
  • STEMucator
  • · Replies 2 ·
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2
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4K
The physical pendulum - mass calculations
  • HalcyonicBlues
  • · Replies 2 ·
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2
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2K
Friction and Rolling Homework: Understand v=rω
  • andyrk
  • · Replies 3 ·
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3
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5K
Moment of inertia by connecting two identical rods
  • judas_priest
  • · Replies 14 ·
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14
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10K
Moment of Inertia of mud thrown on door
  • PsychonautQQ
  • · Replies 2 ·
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2
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4K
Several problems put together in one thread, dynos, density etc.
  • Fishingaxe
  • · Replies 6 ·
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6
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4K
How Does a Dielectric Medium Affect the Force Between Two Point Charges?
  • Stealth95
  • · Replies 13 ·
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13
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3K
Laser experiment, determine angular velocity
  • Gauss M.D.
  • · Replies 1 ·
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1
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2K
How to solve a problem with a bar laying against a wall
  • Jay9313
  • · Replies 8 ·
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8
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2K
What does the Dynamometer show?
  • Fishingaxe
  • · Replies 9 ·
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9
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3K
What is the relationship between intensity and amplitude in waves?
  • Gauss M.D.
  • · Replies 4 ·
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4
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3K
Real 3D Image produced by concave lens
  • Knightycloud
  • · Replies 6 ·
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6
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2K
How much force is in this bar? Am I correct?
  • Fishingaxe
  • · Replies 1 ·
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1
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1K
Will a Particle Remain in Equilibrium if Three Reversed Forces are Removed?
  • Final_HB
  • · Replies 3 ·
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3
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2K
Particle on an inclined plane formula proof.
  • Final_HB
  • · Replies 3 ·
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3
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2K
Calculating electrical potential energy
  • Gavinofree
  • · Replies 1 ·
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1
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4K
What Maximum Height Can a Tennis Ball Reach with Reduced Gravity?
  • PerryKid
  • · Replies 4 ·
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4
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2K
Why can positron go unobstructed through lead?
  • L-I-C
  • · Replies 1 ·
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1
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2K
Calculating Distance and Time for a Moving Car with Constant Acceleration
  • PerryKid
  • · Replies 6 ·
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6
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2K
How to determine the maximum bending moment of a beam
  • harvistar
  • · Replies 2 ·
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2
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6K
What force is needed to produce a constant speed?
  • tjhero123
  • · Replies 9 ·
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9
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3K
Confusing linear momentum GRE question
  • PsychonautQQ
  • · Replies 5 ·
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5
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2K
A particle is vibrating with f : Ut = 8 sin (1/2 pi t/T)
  • sam2711
  • · Replies 2 ·
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2
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2K
How Do You Calculate Focal Length in a Two-Lens System?
  • jones123
  • · Replies 2 ·
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2
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4K
Steel ball oscillating in a glass tube
  • mbigras
  • · Replies 8 ·
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8
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5K
Initial velocity required for object to have x ke at y height
  • fisiks
  • · Replies 3 ·
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3
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2K
Why Are the Mentioned Triangles Similar in the Explanation?
  • user5
  • · Replies 1 ·
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1
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2K
How does this kind of DC motor work?
  • jhast1
  • · Replies 1 ·
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1
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2K
Bernoulli's Equation with a ping pong ball
  • shark1818
  • · Replies 1 ·
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1
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5K
Calculating Acceleration with Tension: A Troubleshooting Guide
  • user5
  • · Replies 12 ·
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12
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2K
Problem with basic doppler effect question
  • PsychonautQQ
  • · Replies 2 ·
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2
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2K
Intensity of the light in the light bulb what physicist described it?
  • m_p_w
  • · Replies 5 ·
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5
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3K
Solve SHM Leaky Bucket: dT/dt Calculus Solution
  • PsychonautQQ
  • · Replies 2 ·
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2
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2K
Electric motor load vs efficiency historical background
  • m_p_w
  • · Replies 2 ·
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2
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2K
Greater degree of the slope=faster acceleration, historical backgroud
  • m_p_w
  • · Replies 7 ·
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7
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2K
Static Charge Induction: Rod and Sphere Experiment
  • Ammar Qasim
  • · Replies 5 ·
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5
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2K
Central Force with application at circle
  • Arkavo
  • · Replies 10 ·
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10
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3K
Acceleration of Block B in a Constrained Motion Problem
  • Saitama
  • · Replies 6 ·
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6
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2K
Calculating Displacement from a Velocity-Time Graph
  • oldspice1212
  • · Replies 7 ·
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7
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3K
Rotational Motion / Torque problem (what did i do wrong?)
  • PsychonautQQ
  • · Replies 3 ·
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3
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9K
Finding the Minimum Velocity for Sustaining Flight Using Dimensional Analysis
  • Beer-monster
  • · Replies 2 ·
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2
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2K
What Wavelengths of Light are Used in Young's Double Slit Experiment?
  • 5ymmetrica1
  • · Replies 4 ·
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4
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4K
Inelastic Momentum / Centripetal force problem
  • PsychonautQQ
  • · Replies 1 ·
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1
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2K
Why Does My Pendulum Pin Support Reaction Calculation Differ from 299N?
  • cambo86
  • · Replies 1 ·
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1
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3K
Displacement on a Position vs. Time Graph
  • greenwave
  • · Replies 2 ·
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2
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5K
Nuclear Reactions: Why Deuterium Can't Undergo Beta Decay
  • STEMucator
  • · Replies 6 ·
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6
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3K
How Do You Calculate the Components of Vector C?
  • donking225
  • · Replies 2 ·
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2
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2K
Find amplitude and frequency given positions and speeds
  • gmark
  • · Replies 2 ·
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2
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6K
Satellite surrounded by four asteroids question
  • tjhero123
  • · Replies 5 ·
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5
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2K
Solve Unwinding Ribbon Homework: Find Acceleration in Terms of m, R, g
  • postfan
  • · Replies 4 ·
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4
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4K
What is the acceleration of a sled in a tractor-pull competition?
  • Enduro
  • · Replies 1 ·
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1
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3K
Potential energy per unit length in a string (sin wave)
  • PsychonautQQ
  • · Replies 3 ·
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3
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3K
How Do You Calculate the Linear Speed of a Yo-Yo Using Energy Conservation?
  • postfan
  • · Replies 37 ·
2
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37
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10K
How does friction affect tension in a statics problem involving belt friction?
  • yaro99
  • · Replies 1 ·
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1
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4K
Angular momentum or work-energy balance?
  • cambo86
  • · Replies 2 ·
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2
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2K
Mass falling while attached to wire
  • mbigras
  • · Replies 6 ·
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6
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5K
Problem with Sines on both sides
  • PerryKid
  • · Replies 8 ·
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8
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2K
Pivoted bar swinging top to bottom
  • postfan
  • · Replies 5 ·
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5
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4K
Calculating Rotational Inertia and Speed of a Square Plate
  • postfan
  • · Replies 50 ·
2
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50
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5K
What is the potential difference between two points in an electric field?
  • tetoo
  • · Replies 20 ·
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20
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3K
Algebraic Approach to Calculating Time for an Object to Fall from a Given Height
  • oldspice1212
  • · Replies 4 ·
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4
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3K
Work or Heat transfer to system?
  • CAF123
  • · Replies 34 ·
2
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34
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7K
Solving a Uniform Rod's Angular and Linear Speed
  • postfan
  • · Replies 14 ·
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14
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5K
Focal distance of lens submerged in water
  • Gauss M.D.
  • · Replies 1 ·
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1
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3K
Solving Motion of Block A on Wedge B
  • hav0c
  • · Replies 3 ·
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3
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4K
Solving for \(\theta\): A Geometry Refresher
  • PerryKid
  • · Replies 3 ·
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3
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2K
Young's Modulus; Extension of a wire
  • AJKing
  • · Replies 15 ·
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15
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9K
Thin Film Interference in Glass Plates: How Many Bright Fringes Will Be Seen?
  • klawlor419
  • · Replies 1 ·
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1
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2K
Electrostatics net force question
  • TheRedDevil18
  • · Replies 5 ·
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5
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3K
Electric circuits voltage flow question
  • TheRedDevil18
  • · Replies 2 ·
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2
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2K
General Basic Projectile Motion Question
  • spark693
  • · Replies 7 ·
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7
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2K
How To Approach Units and Problem Solving Questions?
  • Wiggins2Magic
  • · Replies 4 ·
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4
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2K
Yes, your approach and calculations look correct. Good job!
  • STEMucator
  • · Replies 5 ·
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5
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2K
What Is the Reaction Force to Earth's Gravitational Pull on a Book?
  • Saitama
  • · Replies 14 ·
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14
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3K
Galilean form of the law of transformation of velocities
  • user5
  • · Replies 21 ·
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21
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3K
Contradiction in Wave Amplitude, intensity and Conservation of Energy?
  • SecretSnow
  • · Replies 3 ·
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3
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3K
Finding Average Force Applied On A Slope
  • mynameiscosine
  • · Replies 12 ·
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12
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3K
Finding Moment of Inertia Using Integration
  • student34
  • · Replies 24 ·
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24
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13K
Relative permittivity of a conductor
  • ananthu
  • · Replies 19 ·
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19
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58K
Calculating Linear Density of a Standing Wave: Solving for Lambda
  • lionely
  • · Replies 8 ·
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8
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2K
What happens when tube is immersed in a liquid?
  • DorelXD
  • · Replies 27 ·
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27
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4K
Why Is the Small Angle Approximation Used in Optics Problems?
  • Gauss M.D.
  • · Replies 5 ·
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5
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3K
Finding the reaction force - moments and equilibrium
  • pturo
  • · Replies 4 ·
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4
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7K
Finding magnetic field in wire with non-uniform current density
  • GreatEscapist
  • · Replies 2 ·
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2
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7K
Finding force produced by a Magnetic Field on a Proton
  • MikeBriganti
  • · Replies 8 ·
Replies
8
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3K