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 Fast Must an Electron Travel to Excite a Hydrogen Atom?
  • ke0nGz
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2K
Apparent weight on an elevator. Magnitude of its acceleration?
  • WPCareyDevil
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6
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17K
Finding height with constant acceleration
  • !!!
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2
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3K
Projectile Motion of ball down inclined plane
  • mikee
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6
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4K
Spinning a bucket in a vertical circle
  • proace360
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2
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12K
Motion In Two Dimensions Lab Question
  • Iokia
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4
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3K
Find the Coordinates of Point B using Cross Product
  • Melawrghk
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2
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What Was the Mass of the Original Stack of Books?
  • omgitsmonica
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Proving e^Ae^B=e^{A+B} for Commuting Matrices
  • kreil
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Baseball and projectile motion problem
  • billieluv
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1
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Potential inside of chrged non-conductive sphere
  • anizet
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7
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Need help understanding vector equations (very basic)
  • astonmartin
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1
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Non-uniform circular motion and tangential acceleration
  • Symstar
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2
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8K
How Is the Coefficient of Friction Calculated in a Spring Block System?
  • southernbelle
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3
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How Do You Calculate Initial Speed in Projectile Motion?
  • billieluv
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1
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Question about water weight and pressure
  • lyndan
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4
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How Do You Calculate Potential Energy with a Constant Force?
  • maniacp08
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4
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8K
Help with point charges and electric fields
  • lyndan
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1
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Angular Acceleration of a system.
  • myr10
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1
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What Is the Angular Speed of a Falling Meter Stick?
  • gmiller4th
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1
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Newton's second law and a locomotive
  • Jennifer001
  • · Replies 6 ·
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6
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Pulley question(Newtons third law)
  • Jennifer001
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1
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More projectile motion difficulties
  • billieluv
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4
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3K
Really simple system of equations
  • yoleven
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1
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2K
Series or Parallel Springs? | Homework Help
  • zorostang
  • · Replies 6 ·
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6
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3K
What is the Acceleration of a 2442 kg Elevator Moving Upward?
  • Abb
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3
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Drag of Car across frictionless surface.
  • JosephLee
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1
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2K
How Do You Calculate the Tension in Multiple Wires Supporting Artifacts?
  • lisalisa
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7
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32K
Help with force and motion with friction problems
  • NYbikerkid
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1
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2K
Calculating Spring Force with a Man's Jump and Platform Compression
  • southernbelle
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2
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3K
Using acceleration to find distance traveled
  • swede5670
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3
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83K
Coefficient of static friction of chain
  • coolcat_ka
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4
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6K
What was the object's speed as it fell off the edge of the table?
  • notagenius08
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2
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3K
An Automobiles acceleration and speed
  • swede5670
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2
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27K
Calculating Power Dissipation in a Parallel Circuit with Multiple Resistors
  • buckeyes
  • · Replies 11 ·
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11
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5K
How dangerous is it to ascend with expanding lungs?
  • erik-the-red
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8
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Frictional Forces without coefficient
  • STS816
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1
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Help I dunno how to use coefficient
  • theLHC
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5
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3K
Projectile Motion thrown basketball
  • Cate
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1
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2K
What is the relationship between angular velocity and tangential velocity?
  • rebeccc
  • · Replies 6 ·
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6
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Calculating Frequency of Oscillating Mass on a Spring
  • aleferesco
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4
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18K
What Determines the Charge of an Object in Electrostatic Induction?
  • MIA6
  • · Replies 4 ·
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4
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Direction of the net force on the charge
  • MIA6
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2
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Capacitors disconnected from the battery
  • laduch
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3
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22K
Series Circuit: 10 Ohm Resistor, Bulb, 12V Source
  • ElectricSlide
  • · Replies 9 ·
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9
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4K
Solving Projectile Motion: Horizontal & Vertical Distances
  • kitle545
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1
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Calculating Work Required to Lift a Hanging Chain
  • Default User
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2
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Equal and Opposite variable forces on a mass - does it accelerate?
  • Erica799
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1
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Swinging from a vine (circular motion/tension problem)
  • closer
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4
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How Do You Calculate Stopping Distance Using a Velocity-Time Graph?
  • getfirefox
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Calculating direction of magnitude of a crate on a ramp
  • WPCareyDevil
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2
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Calculating Radial Acceleration in Nonuniform Circular Motion
  • subwaybusker
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What Is the Final Velocity of the Wood After Bullets Impact?
  • omeromer
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3
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Find the magnitude of the electric field at the center
  • larkinfan11
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5
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Potential vs Kinetic Energy Help
  • pinkvoid
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1
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How Does a Rock Climber Use Friction to Climb?
  • uberbandgeek6
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3
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Work and energy - 90% done, just need little clarification
  • maniacp08
  • · Replies 4 ·
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4
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8K
What Is the Final Velocity of a 2 kg Mass on a Frictional Incline?
  • Pakbabydoll
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3
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Need help converting a function of displacement to a function of time.
  • lylos
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5
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Find force link 3 exerts on link 2
  • jturn
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2
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Circular Motion - Roadway Bank Angle
  • JeffNYC
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3
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AP Physics: Vectos and their properties
  • Blodwynne
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4
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Partial derivatives with Wave Function
  • abelanger
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2
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Projectile Motion Using Speed Graph
  • calvert11
  • · Replies 3 ·
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3
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Calculating Work Done on a Block Moving Up an Incline
  • myk127
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Temperature variation of resistance
  • jsantor1
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11
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6K
How Do You Calculate Velocity and Energy in an Elastic Collision?
  • irun4edmund
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4
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Non-Physics Major Needs Physics Help
  • Muirghiel
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1
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3K
PHYSiCS NEED HELP please show work
  • bsmith8808
  • · Replies 2 ·
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2
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Electric motors & faraday's law
  • jackd
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1
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What Is the Error of Log(mh) When m and h Have Known Relative Errors?
  • excel000
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1
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6K
Hanging Mass Tension Problem: What is the tension in each cable?
  • raven2783
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8
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Applications of Faraday's Law: Deflection of Pointer in a Magnet-Coil System
  • jackd
  • · Replies 2 ·
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2
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4K
Physics lab help, determining acceleration thru V vs T graph?
  • papi
  • · Replies 27 ·
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27
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Minimum speed to maintain a circular trajectory
  • xxgaxx
  • · Replies 1 ·
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1
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3K
How Fast Can a Rock Spin Before the String Breaks?
  • hofluff87
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3
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Regents Problems Best Solution
  • spot
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Crates with diff. mass inside elevator at constant speed
  • bocobuff
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1
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What is the Electric Field Outside a Pipe with a Uniform Charge Density?
  • jaejoon89
  • · Replies 4 ·
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4
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Calculate displacement based on velocity and acceleration
  • Planefreak
  • · Replies 3 ·
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3
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A rocket is launched kinematics
  • Jennifer001
  • · Replies 1 ·
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1
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Understanding the Relationship between Tension, Teeth, and Force
  • lovelockdown
  • · Replies 3 ·
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3
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Calculating Minimum Force for Stationary Block Against Wall
  • dwan3
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4
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Calculating the Frequency of a Tuning Fork Using Resonance Tube Method
  • Shackleford
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4
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Potential Difference in a Capacitor
  • cowmoo32
  • · Replies 3 ·
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3
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Kinematics equations with collision fo 2 balls
  • mjolnir80
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1
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What Was the Initial Speed of the Horizontally Shot Arrow?
  • 1234567890
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2
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Determine the centripetal force
  • xxgaxx
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2
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A Terrible Accident involving a Barrel of Bricks and a lot of Force
  • Phoenixtears
  • · Replies 3 ·
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3
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11K
Instantaneous Power (Mastering Physics)
  • ren0x
  • · Replies 3 ·
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3
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24K
How do I find the correct magnitude using vectors and magnitudes?
  • Oblivion77
  • · Replies 6 ·
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6
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General equation for fractional error
  • benji55545
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8
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26K
How Do You Solve Physics Problems Involving Velocity and Pendulum Equations?
  • jjl15hid
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2
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2K
Electric potential difference question
  • jaejoon89
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1
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2K
How Fast Can You Drive Without Hitting the Deer?
  • Jennifer001
  • · Replies 1 ·
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1
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3K
Uncovering the Mass of an Object on Planet X
  • tater08
  • · Replies 3 ·
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3
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9K
Optimizing Silk Strand Diameter for Maximum Tensile Strength
  • crimsonn
  • · Replies 18 ·
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18
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19K
Understanding the Best Fit Line: What Does It Mean?
  • papi
  • · Replies 3 ·
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3
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3K
Help with question on forces with motion, tension, friction
  • shadowofanub
  • · Replies 3 ·
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3
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2K
How does increasing potential difference affect the magnetic force on electrons?
  • MIA6
  • · Replies 3 ·
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3
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3K