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.
Understanding the Relationship between Frequency and Energy in Transition States
  • adamyoung
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Pulley System Where String Breaks
  • jmlibunao
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Particle Hanging by a String is Hit from Below by Another Particle
  • jmlibunao
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7
Help with Simple Resistor problem from physics resistor chapter
  • nchin
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2
How Does Angus Macbangus's Head-butt Physics Work?
  • freshcoast
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Finding Coefficient of friction with limited info
  • shcksdid
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3
What is the Frequency for In-Phase Current and Voltage in RLC Circuit?
  • monnapomona
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What direction will a man appear to be rowing in relative motion?
  • medwatt
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5
Surface charge density due to point charge
  • NewtonianAlch
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3
Moment of inertia for a thin rod
  • dinospamoni
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2
Electric field at a distance greater than the radius of sphere
  • rocapp
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2
Finding centripetal force of an object
  • ajbwarrrior
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Torque around a curb - bicyle forces problem
  • elemons
  • · Replies 8 ·
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8
Moment of Inertia of Compound Disk
  • capst
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2
Finding moment of inertia for a hemisphere
  • dinospamoni
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6
Dynamics help: Spring force and dynamic motion
  • medynamics
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2
What is the speed of recoil of the chair and cat?
  • Sneakatone
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6
Electrodynamics- combination of resistors
  • othonmp
  • · Replies 11 ·
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11
Object flying off a rotating disc
  • quark001
  • · Replies 6 ·
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6
Blood Pressure taken at different heights (No calculations involved)
  • FollowTheFez
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1
3 printers rest on top of each other on a table [FORCES]
  • dungas
  • · Replies 3 ·
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3
Getting Back Into Physics: Struggling to Understand Electromagnetism
  • disknoir
  • · Replies 3 ·
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3
Stability of Orbits Homework: Analyzing Central Force Motion
  • CAF123
  • · Replies 30 ·
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Finding Maximum Power in an AC Circuit
  • pious&peevish
  • · Replies 12 ·
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12
Finding parameters of a hyperbolic orbit
  • CAF123
  • · Replies 11 ·
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11
Find a point charge a distance form a charged rod
  • rocapp
  • · Replies 3 ·
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3
Hooke's Law and Force in a Slingshot
  • mcnealymt
  • · Replies 4 ·
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4
Current and Impedance in a Transformer
  • pious&peevish
  • · Replies 4 ·
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4
Find electric field a distance from a charged sheet
  • rocapp
  • · Replies 3 ·
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3
Why Does Tension Affect Both Masses Equally in a Pulley System?
  • quark001
  • · Replies 27 ·
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Momentum of two colliding trollies.
  • coconut62
  • · Replies 4 ·
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4
Celestial mechanics with symplectic integrators
  • Masklin
  • · Replies 3 ·
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3
Electrical saw with linear speed
  • Robertoalva
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2
Average Effective Dipole moment
  • xz4chx
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2
Confusion about Coulomb's Law and 3 Point Charges
  • Roodles01
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2
How many time constants must elapse in a capacitor?
  • yogotah
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1
RLC Circuit (solved; but not sure where solution is incorrect)
  • pious&peevish
  • · Replies 2 ·
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2
Definition of Magnetic Declination,Inclination
  • Manish Bhat
  • · Replies 1 ·
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1
Physics problem, basketball dunk (Hookes law)
  • x86
  • · Replies 2 ·
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2
What is the current that runs through the circuit
  • badboydasgatas
  • · Replies 4 ·
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4
Solving Work, Energy Problems with Asteroids
  • CollegeStudent
  • · Replies 11 ·
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11
Electric Potential in RC Circuits
  • Bashyboy
  • · Replies 11 ·
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11
Potential of a uniformyl charged sphere
  • ehabmozart
  • · Replies 3 ·
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3
Relative velocities - Velocity of impact
  • memoguy
  • · Replies 3 ·
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3
Innovative mechanical or electrical really cheap toy
  • agnibho
  • · Replies 3 ·
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3
Special Relativity collision problem
  • subsonicman
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An approach to conservation of electrical mechanical energy
  • ehabmozart
  • · Replies 3 ·
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3
How Much Less Do You Weigh at the Top of the World Trade Center?
  • robertmatthew
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Physics problem, involving Hookes Law?
  • x86
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Ideal gas-thermodynamics, thermal equilibrium
  • oxman
  • · Replies 17 ·
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Magnetic Induction Through a Moving Wire
  • Broem
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1
What is the current in the hanging wires?
  • Colts
  • · Replies 6 ·
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6
Spring powered dart gun conceptual question
  • freshcoast
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Double slit experiment problem help
  • MarcL
  • · Replies 12 ·
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12
What happens to the gravitational field strength's magnitude if
  • chaishreen
  • · Replies 5 ·
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5
Grade 11 Forces Help: Acceleration, Friction & Unit Test Prep
  • Zarquad
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5
Voltage, Current, and Time Graph with Sine Wave
  • anomalocaris
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4
Compression Distance Calc of Spring: F=-kx-bx^3
  • fredrogers3
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Entropy Change of a Monatomic Ideal Gas Compressed Adiabatically
  • Basis
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5
Finding Resistance in a Parallel Circuit
  • Mashfeek
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5
Electric Potential and Potential Energy Due to Charged Particles
  • brojas7
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6
Calculating the mass of matter required to accelerate a spaceship
  • dylhynes
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Euler Lagrange Equation Question
  • HiggsBrozon
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Predicting the temperature of absolute zero experimentally
  • PhizKid
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7
Proofing Moment of Inertia Solid Sphere
  • chocophysuny
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6
Why Do Second and Third Order Spectra Overlap in Diffraction Grating?
  • Nemo's
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Little questions (Force, Moment, Young)
  • coconut62
  • · Replies 13 ·
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13
Dynamics, Newton's laws, Problem with free body diagram and work
  • akmenio
  • · Replies 1 ·
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1
Is My Momentum Lab Chart Correct?
  • silentcoder
  • · Replies 1 ·
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Finding potential difference(electric circuit)
  • Jabababa
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Definition of first law of thermodynamic?
  • mugen715
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Quick Quick electrical current concept question
  • StephenD420
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Hockey Puck- Physics Friction Problem
  • IamMoi
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6
How much current does a 1500W electric appliance draw in a 120V circuit?
  • Jabababa
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How Long Does a 25% Efficient 750W Motor Take to Lift a 45kg Object to 9m?
  • Jabababa
  • · Replies 11 ·
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Calculating Current of Alpha Particle Beam
  • Jabababa
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Calculate the emf of Battery w/ External & Internal Resistance
  • Jabababa
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1
Maximum Light Bulbs on a 110V Circuit with 20A Limit?
  • Jabababa
  • · Replies 2 ·
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Electromotive force of automobile battery
  • member 392791
  • · Replies 12 ·
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12
Electric Circuit: Find Voltage Req'd to Charge Battery
  • Jabababa
  • · Replies 1 ·
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Max Range Potato Launcher w/ Spring Force Problem
  • freshcoast
  • · Replies 10 ·
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10
What is the minimum turn radius for a roller coaster with given conditions?
  • freshcoast
  • · Replies 27 ·
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How Do You Calculate the Moment of Inertia for Combined Square Laminas?
  • hms.tech
  • · Replies 3 ·
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Designing/Finding Something that Sinks Slowly
  • DivineProdigy
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Energy considerations in solving a bungee jumper question
  • Toranc3
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3
Testing for Charges in X-Y Plane Given Field Lines
  • trevor51590
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Propagation of uncertainty in an experiment
  • MeissnerEffect
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Locomotive question with three trains involving force and acceleration
  • needingtoknow
  • · Replies 6 ·
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6
What is the excitation energy of an atom after a photon collision?
  • Unicorn.
  • · Replies 5 ·
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Ranking Brightness of Lightbulbs in a Circuit
  • leonardthecow
  • · Replies 1 ·
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Why is the following situation impossible?
  • physics=world
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Using ratios to obtain the weight of a person at a specific distance
  • needingtoknow
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How far will a pullback car go? Spring and friction coefficients.
  • Totally
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3
The lifeguard problem: find the direction of sprint.
  • tsuwal
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2
How Do Birds Generate Lift and Drag While Gliding?
  • 7Suarez
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Electric field at the center of a semicircle
  • rocapp
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2
Circular Motion Question: Bird's Net Vertical Force and Upward Lift Calculation
  • FollowTheFez
  • · Replies 2 ·
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Calculating Space Probe Speed for Escape Velocity
  • kopinator
  • · Replies 2 ·
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2
Calculating Density of a Planet Based on Close Orbit Satellite Period
  • kopinator
  • · Replies 1 ·
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Help with Efficiency of a motor
  • mlle-castita
  • · Replies 4 ·
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4