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 Inclined Plane Accelerate for a Block to Slide Down?
  • jromega3
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Block being pushed along the floor (dynamics problem)
  • mjolnir80
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1
Overcoming Friction in of a sliding box
  • Fins_Wish
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1
Solve F=ma Pulley Problem: Mass of Sand & Acceleration
  • crimsonn
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Velocity and height of an arrow
  • the whizz
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2
General Conservation of Momentum Problem
  • pinkerpikachu
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What Do the Units Seconds/Degrees Squared Represent in a Pendulum Lab?
  • Dynamite
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Potential Energy Function Given E sub-t
  • JWDavid
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2
What Determines the Average Kinetic Energy of Ideal Gas Molecules?
  • Linzy
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Rotational dynamics of two cars
  • zoner7
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Conceptual Center of Mass acceleration problem
  • bocobuff
  • · Replies 12 ·
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Conservation of energy problem.
  • the whizz
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Internal Energy Homework: Compare & Rank H2 Molecules in Containers
  • Linzy
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3
Deriving Equation #3: (b/2)θ=L(2θ)
  • Brit412
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3
How does the radial current density affect the area element dA in Ampere's Law?
  • StephenDoty
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1
How Do You Calculate the Coefficient of Kinetic Friction on a Ramp?
  • crcowboyfan
  • · Replies 4 ·
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Rotational Motion of a thin rod
  • Bones
  • · Replies 10 ·
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10
The Doppler Effect on railroad tracks
  • mistymoon_38
  • · Replies 2 ·
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Ideal Gas- molecules applying pressure
  • latitude
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4
Which radius (r or R) should you use? Why?
  • shimizua
  • · Replies 1 ·
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1
What is the Conservation of Energy Homework Problem?
  • the whizz
  • · Replies 11 ·
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11
Distance from Satellite to Earth Question
  • Sevenheartz
  • · Replies 4 ·
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4
How to conect 7447 in circuit board to make 7-seg desplay workin
  • dubai boy
  • · Replies 4 ·
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4
Elastic collisions in a nuclear reactor
  • map7s
  • · Replies 2 ·
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2
Finding angle of swinging pendulum
  • the whizz
  • · Replies 2 ·
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2
What are the Work and Energy Relationships in a Spring System?
  • blakester
  • · Replies 5 ·
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5
What is the gravitational force homework
  • ganondorf29
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2
How Many Revolutions Does a Slowing Ceiling Fan Make?
  • cbrown7
  • · Replies 1 ·
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Coefficient of Kinetic Friction
  • daliberataaa!
  • · Replies 4 ·
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4
What is the total force on a semicircular wire in a uniform magnetic field?
  • bakin
  • · Replies 3 ·
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3
Pressure in a Rectangular Tank
  • uno
  • · Replies 2 ·
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2
Normal force in circular motion, is my work correct
  • fishingspree2
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How Can Torque and Tension Prevent Building Collapse?
  • asleight
  • · Replies 8 ·
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8
Finding the tension in a string
  • hansel13
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2
Block compresses spring, find coefficient of kinetic friction
  • Nick-
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Centripetal Acceleration of North Pole
  • lacar213
  • · Replies 4 ·
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4
Solve Kinetic Energy & Velocity for Smallest Molecules: A
  • Linzy
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1
Strength of magnetic field from a current filled wire at a point
  • sbielby413
  • · Replies 6 ·
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6
Finding the Spring Constant of a ball
  • ckrup
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3
How much heat (calories) is required to raise the temperature
  • Linzy
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1
Calculate Min Angle to Exert 35.0 NM Torque with 355 N Force
  • lacar213
  • · Replies 3 ·
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Rocket fuel consumption too easy?
  • shutoutsteve
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2
Inclined plane + Inclined force. Normal reaction force = ?
  • 1337pHysiX
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Collisions in Two Dimensions (Perfectly Elastic)
  • calvert11
  • · Replies 4 ·
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4
Calculating the Distance and Velocity of a Thrown Object Using Kinematics
  • crimsonn
  • · Replies 3 ·
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3
Thermal expansion in heat engine
  • skittlebrew
  • · Replies 1 ·
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How Do You Calculate Heat Loss from a Box and Heated Gas?
  • nuby
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Ground state energy in Optical Spectroscopy & Atomic Structure
  • sheri1987
  • · Replies 1 ·
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Magnetic fields (multiple choice)
  • Foxhound101
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Unwinding Spool vs. Standard Block
  • ssturb
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3
How do you calculate the net torque in a friction torque problem?
  • Bones
  • · Replies 2 ·
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2
Calculate Density of Solid Object Floating in Water
  • omgitsmonica
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2
Solve Relativity Question: Find Distance Between Events A & B
  • fzksfun
  • · Replies 2 ·
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2
Harmonic Motion in Earth and Moon: A Comparative Study
  • SciencePF
  • · Replies 6 ·
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6
Inelastic collision and Kinetic Energy Conservation
  • stonnn
  • · Replies 2 ·
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2
What fraction of the engine power is being used for the place to fly
  • cantgetno
  • · Replies 5 ·
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5
How do I calculate maximum spring compression using the work-energy theorem?
  • cantgetno
  • · Replies 2 ·
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Help Solve Impulse Problem w/ Pendulum Bob
  • Kudo Shinichi
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2
At 10 m/s, how high is this second hill?
  • deanine3
  • · Replies 3 ·
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3
Optics-Diffraction of Thin Hair
  • sheri1987
  • · Replies 3 ·
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3
Deriving Final Equation from Equations 1 & 2
  • caligyrl4lyfe
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Wierd Circuit Need Help Figuring it Out
  • Mopar426Hemi
  • · Replies 1 ·
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Quick ? about gravitational torque
  • bocobuff
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Total Kinetic Energy: Solving 72 kg Person Running at 12 km/h
  • mdewdude
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Concave Mirror Image Magnification Calculation
  • Kris1120
  • · Replies 3 ·
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QUICK torque and static equilibrium
  • rawrdrena
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Rotational Inertia of a combination around a fixed axis
  • bocobuff
  • · Replies 11 ·
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Help, KE problem, not sure where to start
  • deanine3
  • · Replies 17 ·
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Calculating lifetime of a moving pion
  • crh
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Solving Rocket Launch at 75 Degrees After 11.2s
  • HomerPepsi
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Force in an elevator during acceleration
  • Strikersn
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Spring gun problem can't find start
  • JWDavid
  • · Replies 4 ·
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Extremely confused by the wording of aa extremely easy problem
  • iacephysics
  • · Replies 3 ·
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3
Diverging Spherical Lens Proof
  • emperrotta
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How Do You Calculate Initial Velocity of a Baseball Hit at an Angle?
  • imlame11
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Max Photo Current Calculation Using Platinum's Work Function
  • xago
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Time needed for a transverse wave to propagate on a string
  • spaghed87
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3
Reactance and Inductance of an inductor
  • Kathi201
  • · Replies 1 ·
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Find the Coefficient of Friction Given Frequency
  • CoffexCream
  • · Replies 2 ·
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Finding Instantaneous Acceleration/Velocity
  • chaunceytoben
  • · Replies 5 ·
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5
Work-Energy Theorem: Find Force on 16g Bullet Accelerated to 1010m/s
  • blayman5
  • · Replies 7 ·
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How to Calculate FM in a Walking Person Using a Cane?
  • TJDF
  • · Replies 1 ·
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Maxwell Boltzmann distribution
  • vincisonfire
  • · Replies 2 ·
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Solving Angular Momentum & Energy Conservation for Velocity at Point A
  • asi123
  • · Replies 4 ·
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Pendulum, conservation of energy theorem
  • fishingspree2
  • · Replies 3 ·
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3
How Do You Create a Scale Drawing of a Hot Air Balloon with Mints as Passengers?
  • Ineedhelp101
  • · Replies 1 ·
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Kinematics Question: How Long to Fall 36m with Negligible Air Resistance?
  • crimsonn
  • · Replies 6 ·
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Finding the coefficent of static friction
  • pinkerpikachu
  • · Replies 4 ·
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Sir Lancelot Equilibrium Bridge Problem
  • Dillio
  • · Replies 1 ·
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Deriving absolute error equation
  • AcecA
  • · Replies 2 ·
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Ideal circuit with 4 resistances and one emf.
  • Mike88
  • · Replies 2 ·
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2
How Much Energy Is Needed to Launch a Satellite into Orbit?
  • Effective
  • · Replies 1 ·
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Solving for The Relative Motion of a Boat: Angle & Speed
  • omerr
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Pressure, Density, and Atmospheric Pressure
  • kallisti
  • · Replies 1 ·
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Finding Zero Net Electrostatic Force of +ve Charge b/w q1 & q2
  • forty
  • · Replies 1 ·
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Question about Newton's second law
  • Elclon
  • · Replies 3 ·
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How Does Pipe Expansion Affect Water Pressure?
  • omgitsmonica
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Differential cross section/simple integral
  • jonwell
  • · Replies 5 ·
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Rotational & Translational Energy
  • mschoen
  • · Replies 2 ·
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Can the kinetic energy of a system be negative?
  • meredith
  • · Replies 1 ·
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1