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.
What is the speed of a cylinder rolling down a hill?
  • zeralda21
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Effects on water level when a sphere is replaced by a new solid sphere
  • marisalyn21
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6
Finding Gravitational Acceleration from a Slope
  • rakeru
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21
Solving Ball's Wall Impact Time w/Force & Mass
  • An1MuS
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14
Angular momentum operators on matrix form
  • Denver Dang
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1
Electric Potential Problem Involving Uranium Atom
  • Kumo
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8
Velocity of a fluid within a pipe
  • tooperoo
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5
Projectile Motion: Finding Total Flight Time of Lettered Images
  • shin777
  • · Replies 16 ·
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16
What is the x>0 mean here? standing wave equation find nodes?
  • Outrageous
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Calculating gauge pressure in lungs to produce certain speeds
  • tooperoo
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2
Solve Impedance Problem: 50nF Capacitor & 47kΩ Resistor
  • k31453
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3
Compare Velocity of Center of Mass - Two Hollow Cylinders
  • LovePhys
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2
Calculate displacement [Two Dimensional Kinematics]
  • HanSomPa
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Electric charges and conservation of energy
  • vex390
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Find Tension in String Connecting Two Charged Spheres
  • vex390
  • · Replies 4 ·
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4
Linear and Volume expansion Problem
  • jk27
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Help with a volume expansion problem
  • KTANNE
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3
Solving Johnny's Swing Height Puzzle: Can You Get 1.4 Meters?
  • Speedking96
  • · Replies 3 ·
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3
Is My Newton's Law Homework Answer Correct?
  • whoareyou
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1
How Do I Convert v^2/r Into v?
  • AnonymousTeen
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1
Answer: Understanding Electron Volt Energy for X-Ray Machines
  • tooperoo
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2
Several exam questions I got stuck on
  • influx
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D and E at boundary (dielectrics)
  • mishima
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Oscillations and waves-reflection through the surface of a medium
  • saumya yadav
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How to adjust cars diagonal weight without scales?
  • chkhikvishvil
  • · Replies 5 ·
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5
Classical mechanics, mass on a spring
  • Cogswell
  • · Replies 12 ·
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12
Solving Tension in a Cable Homework
  • datphysics
  • · Replies 5 ·
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5
Electrostatics, parallel plates
  • physics604
  • · Replies 3 ·
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3
Period of an Oscillating Particle
  • robertjordan
  • · Replies 15 ·
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15
Voltage transfer functuon of network
  • jmher0403
  • · Replies 3 ·
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3
Electrostatics, finding velocity of electron
  • physics604
  • · Replies 3 ·
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3
Electrostatics, finding velocity of proton
  • physics604
  • · Replies 3 ·
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3
Cone rolling on a conical surface
  • Saitama
  • · Replies 8 ·
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8
When is the first equation used to calculate pressure change in a system?
  • FollowTheFez
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1
Finding Torque within the Human Arm
  • KakashiT
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2
Particle collides totally inelastically with a vertical free rod
  • rbwang1225
  • · Replies 2 ·
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2
Boolean Algebra (negation quickie)
  • sunrah
  • · Replies 4 ·
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4
Car turning on a curved road and friction
  • andyrk
  • · Replies 5 ·
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5
Distance between 2 atoms in a crystal
  • Nemo's
  • · Replies 9 ·
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9
Linear Drag Force Homework: Acceleration & Constant Speed Calculations
  • antoman
  • · Replies 3 ·
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3
Using torque to find mass of meter stick
  • gake
  • · Replies 11 ·
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11
Varying Potential Energy and Amplitude in Unusual Harmonic Motion
  • Arkavo
  • · Replies 91 ·
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Best solution? for work done on a spring.
  • Tyrannosaurus_
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4
Vector diagrams and Calculating Angles
  • FollowTheFez
  • · Replies 10 ·
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10
Angle Between Hour & Second Hand:130.25° or 133°?
  • ador250
  • · Replies 5 ·
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5
Question- Newton's Law of Cooling
  • sankalpmittal
  • · Replies 4 ·
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4
Statics- Resultant couple moment
  • rico22
  • · Replies 4 ·
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4
What is the Velocity of Water Exiting a Hole in a Bucket?
  • HelpMePleez
  • · Replies 7 ·
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Photon flux from a light source
  • spaghetti3451
  • · Replies 2 ·
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2
Heat energy change when gas compressed
  • blueberryfive
  • · Replies 4 ·
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4
Euler Angles/ Rigid Body application
  • redlegtwoone
  • · Replies 3 ·
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3
Understanding Uniform Circular Motion: Exploring Centripetal Acceleration
  • andyrk
  • · Replies 10 ·
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DIffering Weight at equator and poles
  • gake
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Find the time constant of a damped system
  • hamsterB
  • · Replies 1 ·
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1
Oblique Impact of a smooth sphere against a fixed plane
  • andyrk
  • · Replies 10 ·
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10
How Do Injected Holes Flow in an NPN Transistor?
  • anhnha
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3
How Fast Can a Merry-Go-Round Spin Before a Child Slides Off?
  • cheddahchad
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Elastic collision. to find values
  • shin777
  • · Replies 7 ·
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What is the motion of the block when released from a compressed spring?
  • allyfranken
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Explain to me why the net force is found this way?
  • agentlee
  • · Replies 8 ·
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8
Help understanding this Kinetic energy problem
  • urbano
  • · Replies 4 ·
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Cartesian Distance from Origin in the XY Plane
  • Robertoalva
  • · Replies 8 ·
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Displacement of box on inclined plane due to spring
  • hkor
  • · Replies 10 ·
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Change in momentum after hitting a wall
  • gake
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Minimum acceleration needed for box to not fall from accelerating cart
  • hkor
  • · Replies 8 ·
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Why we cannot measure built in voltage in PN juction?
  • anhnha
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Calculating Raindrops per Tile: A Density Problem | Solution in Drops/Tile
  • Robertoalva
  • · Replies 3 ·
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3
What are the equations for projectile motion on an inclined plane?
  • Big-Daddy
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Constant Acceleration; Dynamics
  • allyfranken
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Orbit about star, emission spectrum of light
  • unscientific
  • · Replies 3 ·
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3
What is the Relationship Between Net Flux and Total Charge for a Cube?
  • baird.lindsay
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Calculus-based relationships in electrostatics
  • blueberryfive
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Projectile explosion velocity and direction of fragments
  • j_namtirach
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Estimate minimum proton lifetime from internal radiation rate
  • sunrah
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1
What ion is this? even emission lines matches lyman series of hydrogen
  • unscientific
  • · Replies 1 ·
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1
How Is the Rydberg Constant Calculated from Photon Absorption Wavelengths?
  • unscientific
  • · Replies 7 ·
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What is the radius of the equipotential surfaces for a charged cylinder?
  • carnot cycle
  • · Replies 7 ·
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7
Simple physics question: Which Spot on the wheel travels faster?
  • lala_and_peril
  • · Replies 13 ·
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13
Direction of normal reactions on a beam
  • arestes
  • · Replies 1 ·
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Crumple zone in cars and ways to measure its effectiveness
  • komender
  • · Replies 8 ·
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8
Speed of rocks when they hit the ground
  • limonade
  • · Replies 2 ·
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2
Statics Problem, Moment About an Axis
  • yaro99
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3
Why are insulator losses considered in power distribution?
  • anhnha
  • · Replies 3 ·
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3
Addressing Force Direction in Torque Equations
  • cdornz
  • · Replies 5 ·
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5
Relative velocities of two particles in circular motion
  • wifi
  • · Replies 2 ·
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Find the vertical distance the car has fallen
  • jenjo
  • · Replies 2 ·
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2
Turning simple concept of F=ma into a nightmare
  • riseofphoenix
  • · Replies 19 ·
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19
Calculating conservation of Energy, Frictionless Oscillatory Motion
  • mgazaway72106
  • · Replies 1 ·
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Young's Modulus: Vibrations in a rod
  • AJKing
  • · Replies 3 ·
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Finding the max. extension in the spring
  • exuberant.me
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Inductor and capacitor as current and voltage sources
  • anhnha
  • · Replies 9 ·
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Finding the Minimum Force to Move Two Bars Connected by a Spring
  • Saitama
  • · Replies 4 ·
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Transistor characteristic understanding
  • anhnha
  • · Replies 5 ·
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5
Grade 11 Physics Problem - Vectors and Water Currents
  • hg10tr
  • · Replies 6 ·
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6
Equilibrium and displacement of a Particle
  • rico22
  • · Replies 14 ·
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14
Does an Electron Decrease Capacitor Voltage by Adding to Positive Charge?
  • anhnha
  • · Replies 1 ·
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How Do You Calculate the Tension in a Cable Supporting a Boom at an Angle?
  • katiegerster
  • · Replies 2 ·
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Potential of a finite line of charge
  • Mathoholic!
  • · Replies 11 ·
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11
Tension Physics Help: Solve for T with mg/ma Equations
  • katiegerster
  • · Replies 4 ·
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4
Electric motor(calc. angular velocity
  • antoman
  • · Replies 6 ·
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6