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.
Question about relativity theory
  • nufa19
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Uncertainty with sine of angles?
  • Rampant
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Finding voltage phasor resistance * current phasor
  • pokie_panda
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2
Electrostatic force and Gravitational force
  • MartinaCilia
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Confusion about Acceleration of an Object
  • user14245
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4
Find average acceleration from two given velocities each at a given ti
  • tylertwh
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2
Non-constant acceleration of a race car from rest
  • haroldwershow
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5
Calculating Magnetic Forces on Moving Charges in a Magnetic Field
  • silentcoder
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8
Light Interference Wave Equation - Assumption
  • elemis
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9
Understanding Battery Discharge & Peukert's Law
  • botanzee
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2
Parallel circuit multiple choice question
  • DrKitten_Paws
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3
Impulse and momentum for an athlete jumper
  • Sam Fred
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3
How Do You Calculate Angular Velocity in a Rotating Rod with a Spring?
  • drewta
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9
Describing electromagnetic radiation, why is there a second sin term?
  • daselocution
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Beam of particles in a cylindrical pipe
  • CAF123
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3
Using Farady's law with a closed loop.
  • crashdirty86
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1
Inelastic Collision and average force between 2 trains
  • Sam Fred
  • · Replies 6 ·
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6
The Conservation of Momentum in a Completely Inelastic Collision.
  • student34
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3
Solving Physics on Own: Horizontal Force for Blocks
  • Joran Verlaeck
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4
Magnetic Flux and Induced EMF at South Pole
  • m00nbeam360
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4
Find work done in stretching rubber band
  • inter060708
  • · Replies 9 ·
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9
Tricky circuit with variable resistor
  • zeralda21
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4
Analyzing a Circuit with Phasors: Determining Inductance and Resistance
  • Dieinhell100
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8
Finding Current in a Complex Circuit
  • Questions999
  • · Replies 12 ·
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12
Coefficient of kinetic friction and constant acceleration
  • addy899
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4
Could I treat this as a closed loop?
  • kikko
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2
Magnetism; the path of electrons
  • Stroobi
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1
Optimizing Polymer Coating Thickness for Reflectivity at 500 nm Wavelength?
  • Maxamillion00
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Finding Minimum Thickness Problem
  • Maxamillion00
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2
How Does Dropping a Heavy Object into Water Affect Its Temperature?
  • ryu1
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6
Monochromatic Light and a 30-60-90 Prism Beam
  • craighenn
  • · Replies 7 ·
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7
Calculating Time for Bolt to Fall in Elevator with Constant Acceleration
  • physics kiddy
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Find the speed of the boat relative to the current
  • setonhall3000
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2
Find the Angular Acceleration with and Without the disk inertia
  • Northbysouth
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Calculate the speed of a particle?
  • x86
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1
Electric Field Strength of Cylinder Capacitor at Inner Radius
  • universitypq98
  • · Replies 6 ·
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Physics problems driving me crazy- each book has different formulas
  • x86
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Magnitude of acceleration of a pendulum
  • addy899
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5
How Do You Calculate Angular Momentum for a Particle in Motion?
  • mcnealymt
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What Forces Act on a Train Carriage Moving Along a Bend?
  • Pi-Bond
  • · Replies 10 ·
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Amount of Kinetic Energy Lost in Inelastic Collision
  • addy899
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Shape of an Electric Potential?
  • TitaniumX
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Calculate the Initial Calue of the Force at the Bearing
  • Northbysouth
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1
Angular Dynamics: 150Nm, 75rpm, 9 & 23 Revs. Determine Inertia & Friction
  • MMCS
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3
Find N for Isotope with 10.84 Day Half-Life
  • dinospamoni
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5
Calculating Equatorial Speed of Electron Spin in Solid Sphere Model
  • inferno298
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Radiation Pressure Force on Earth
  • sharrington3
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Kirchhoff's laws question circuit?
  • Questions999
  • · Replies 10 ·
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10
Physics Summer Assignment Question
  • jbmiller
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How Do You Calculate Vrms for a Neutron in a Reactor Core?
  • johns123
  • · Replies 3 ·
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3
Electric Dipole Potential at 90-Degree Angle | Solution & Verification
  • universitypq98
  • · Replies 8 ·
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8
Real Image Optics: Selecting Correct Answer
  • TitaniumX
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4
How Do You Calculate Moment of Inertia for Different Axes?
  • mcnealymt
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How do I calculate the power output of the lightbulb?
  • jawhnay
  • · Replies 15 ·
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Calculate Raft Buoyancy Depth | Density, Volume & Pressure Formula
  • Jbreezy
  • · Replies 14 ·
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Work Done by Gas in Isothermal Expansion of Balloon
  • Joshb60796
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Angular momentum of spinning mass on wheel
  • elemis
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5
Is the Angular Equation Divided by Radius in This Example?
  • MMCS
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Find Tmin for J=1 to J=0 and J=2 to J=1
  • jen21
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Can a charged sheet attract uncharged objects?
  • utkarshakash
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Calculating Total Extra Exposure from Multiple Radiation Sources
  • Von Neumann
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Rotating diatomic - Pretty basic first year question. Workings given
  • elemis
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Help with Balancing a metal rod experiment.
  • jim_boob
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Finding electric potential with non-uniform charge density?
  • solijoli
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A ball is thrown up , another is dropped. Do they arrive at the same t
  • cmkc109
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Estimating Radiation Exposure from Multiple Sources
  • Von Neumann
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Constrained Motion Problem: Understanding the First Step in the Solution
  • Clever_name
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9
Determine max notmal stress, average shearing stress and bearing stres
  • Northbysouth
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Heating Your Kitchen with Your Refrigerator
  • 2001
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Molecular flux-thermodynamic kinetics
  • oxman
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Gravity and Rotation: Will the Top Segment Reach the Ground First?
  • aerograce
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Charge at a distance from a non-conducting hemisphere
  • adobekenobe
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What is the intensity of light after removing the second polarizer?
  • srwilliams444
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Pipe cutter is fixed on a pipe, with 3 forces acting on the pipe.
  • BaLTHEBEAST
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Reaction force for force exiting a tank through a clean hole
  • DylanW
  • · Replies 9 ·
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9
Find Amplitude and Equilibrium in Simple Harmonic Motion
  • jcd2012
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Double slit interference experiment
  • hamson
  • · Replies 4 ·
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4
How Far Can You Hear the Siren at 2400 Hz?
  • kopinator
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I'm not sure what the question is asking. What is v12 and v22?
  • paras02
  • · Replies 13 ·
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Special relativity transformations
  • zhillyz
  • · Replies 3 ·
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How Does Resistance Vary in a Ferromagnetic Circuit?
  • Pi-Bond
  • · Replies 9 ·
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9
Kinetic Energy of a Rotating Bar
  • student34
  • · Replies 4 ·
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4
What is the Average Speed of a Car on a 100 Minute Trip?
  • cmkc109
  • · Replies 4 ·
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4
Simple harmonic motion/static equilibrium -spring problem, mass given
  • mariegrdnr
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Minimizing Hazards and Validating Data in Potential Divider Experiments
  • Aibek
  • · Replies 8 ·
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Standing question - real straightforward- Workings given
  • elemis
  • · Replies 1 ·
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1
Difference between torque and work
  • swadish
  • · Replies 1 ·
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Help with Physics: Motion in a Plane
  • knitwit704
  • · Replies 6 ·
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6
Calculating minimum torque and energy in a crane system?
  • freshcoast
  • · Replies 12 ·
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12
Torsional oscillator with angular displacement
  • Robertoalva
  • · Replies 1 ·
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Wave produced in a ripple tank appear to stand still at 66.7Hz?
  • emie029
  • · Replies 16 ·
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Torque and angular acceleration of two discs
  • freshcoast
  • · Replies 1 ·
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Torque on a wheel and angular acceleration.
  • SherlockOhms
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Can an Electric Motor Also Be a Generator?
  • lwoodlore
  • · Replies 9 ·
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A Hollow Conducting Sphere Gauss' Law
  • JerryWakai
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What do I do if my uncertainty is larger than the actual value?
  • vvfrn3
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Find the value of a capacitor given percent of the initial value
  • rocapp
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How Do You Calculate the Torsional Constant of a Wire?
  • Robertoalva
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4
What is the Ratio of Resistances in a Series Circuit with 20% Power Dissipation?
  • KidCudi11
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Amount of time taken for truck over 5.0km
  • icesalmon
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1