Free introductory physics homework help step by step from qualified mentors. Algebra and calculus based general physics homework. High school and undergraduate level.
Threads
How long does it take for the disk to stop rotating?
- Istiak
- · Replies 12 ·
Find the center of mass of an arc
- Istiak
- · Replies 3 ·
How Does a Ping Pong Ball Behave in Zero Gravity?
- robax25
- · Replies 23 ·
Identifying which region of a conductor experiences the greater force
- ellieee
- · Replies 3 ·
Sketch the Electric Field at point "A" due to the two point charges
- jbyolo101
- · Replies 6 ·
Why a lamp with X PD passes Y current
- moenste
- · Replies 23 ·
Why does a charged rod attract an uncharged metal sphere?
- JNOD
- · Replies 6 ·
What is the tension of the rope?
- Ebi
- · Replies 54 ·
Rifleman standing between two cliffs hears two echos from a single shot
- GforOevOerD
- · Replies 2 ·
Show that the given electric field is a plane wave
- Blanchdog
- · Replies 3 ·
Can I use the principle of conservation of energy for this problem?
- hendrix7
- · Replies 7 ·
Computing curl of E to verify Faraday's law with plane waves
- Blanchdog
- · Replies 3 ·
Multivariable Calculus proof for Optics
- Blanchdog
- · Replies 4 ·
Does Poiseuille's Law apply for vertical motion of fluids down a tube?
- g9WfI
- · Replies 2 ·
What is the relationship between pressure and flow rate?
- HystereeSis
- · Replies 8 ·
Load cable angle on a rotating crane with centripetal force
- Thickmax
- · Replies 4 ·
Collision between two uniformly moving particles
- brotherbobby
- · Replies 7 ·
Displacements in a system of two masses connected by three springs
- Istiak
- · Replies 16 ·
What happens if the normal reaction force is less than zero?
- goldfish9776
- · Replies 8 ·
How do I calculate the kinetic energy of a lifted wall?
- Thickmax
- · Replies 8 ·
Restrictions on the frame of reference
- yucheng
- · Replies 4 ·
Forces acting on a moving crane
- Thickmax
- · Replies 13 ·
Using virtual work to find the angle of a bar supported by two planes
- tomul
- · Replies 22 ·
Determining v from momentum / impulse
- g9WfI
- · Replies 2 ·
Velocity-distance graph for a freely falling body
- g9WfI
- · Replies 7 ·
Derivation of "arcsin" phase shift formula
- DeldotB
- · Replies 21 ·
Static lift: How to calculate the volume of displaced fluids?
- physiker278
- · Replies 25 ·
The Electric Field and Potential Energy in a Spring System
- Istiak
- · Replies 38 ·
Why is the value of EMF generated by a generator not zero at t = 0 s?
- songoku
- · Replies 2 ·
What is the perceived relative velocity of these two motorcycles?
- Badmeditator
- · Replies 12 ·
Finding distance between two points
- fcici7
- · Replies 4 ·
Compute relativistic addition of velocities
- Office_Shredder
- · Replies 1 ·
Force of water against a dam gate
- brotherbobby
- · Replies 29 ·
Magnetic field of a permanently magnetized cylinder
- LCSphysicist
- · Replies 8 ·
How to determine Refractive Index without using the Refractive Angle?
- jonas_28
- · Replies 3 ·
Change in heat and internal energy
- Ashshahril
- · Replies 3 ·
Finding light wavelengths from slit spacing and screen distance
- meher4real
- · Replies 18 ·
Newton's 3rd law question -- A gun firing a bullet
- samcoelho
- · Replies 2 ·
Magnetic field generated by a current in a wire - special relativity
- Frostman
- · Replies 1 ·
Equilibrium with the string in the center exactly horizontal
- Mcmenhweilleisi
- · Replies 6 ·
Gravitational Potential In the Field Caused by Two Masses
- BrandonInFlorida
- · Replies 12 ·
Motion in 2 dimensions -- Total displacememt of an ant walking
- danielsmith123123
- · Replies 10 ·
Can Spacelike and Timelike Points Undergo the Same Transformations?
- LCSphysicist
- · Replies 1 ·
Solving a collision question, is there enough information?
- pkc111
- · Replies 2 ·
Grade 11 physics and equivalent resistance
- danielsmith123123
- · Replies 3 ·
Is the potential energy of an ion in a lattice ##U_0## or ##U_0/2##?
- yucheng
- · Replies 9 ·
Griffiths Quantum Mechanics Problem 1.18: Characteristic Size of System
- yucheng
- · Replies 3 ·
Electrical circuit problem (resistors, capacitors, inductors )
- user1296
- · Replies 20 ·
Calculating Effective Coefficient of Thermal Conductivity
- songoku
- · Replies 10 ·
Calculation on spontaneous fission and effect from alpha decay
- Luxdot
- · Replies 23 ·
How Can I Analyze Particle Movement Given Potential Energy and Force Function?
- RubroCP
- · Replies 14 ·
I'm not understanding how to calculate the magnetic field of a sphere
- LCSphysicist
- · Replies 8 ·
Magnitude of the electric field?
- Eliasm
- · Replies 1 ·
What is the potential energy of a system with N cubes at equidistant heights?
- RubroCP
- · Replies 3 ·
Why is the direction in which the D.C. motor turns reversed here?
- ellieee
- · Replies 3 ·
Energy, work, power and efficiency when throwing a ball upward
- danielsmith123123
- · Replies 4 ·
Work, Power, Energy, Efficiency
- danielsmith123123
- · Replies 6 ·
Is ΔUL equal to ΔUR in this case?
- RubroCP
- · Replies 6 ·
Dynamics of a double atwood machine
- Aurelius120
- · Replies 9 ·
Correct statement about telescopes
- songoku
- · Replies 18 ·
What is the relationship between epsilon and sigma in multi-ferroic materials?
- Nickpga
- · Replies 23 ·
Calculating Potential Energy from Force for Non-Linear Systems
- RubroCP
- · Replies 4 ·
Strange question — Catapult launching a marble over an obstacle
- neilparker62
- · Replies 12 ·
Centripetal force on a person on the Earth
- barryj
- · Replies 32 ·
Question on problem 2.16 (a) of the Feynman Lectures (two-mass pulley)
- tomul
- · Replies 2 ·
Fields in a capacitor before and after adding a dielectric layer
- Wadah
- · Replies 10 ·
Find the center of gravity of a combined cone and cylinder
- gnits
- · Replies 7 ·
Why does mass double when wind speed increases from 60 to 120 mph?
- Shaye
- · Replies 6 ·
Thermal Expansion of a Triangular Frame
- SilverSoldier
- · Replies 2 ·
Electric field of wire and cylinder at one point in space
- uni98
- · Replies 5 ·
Finding the potential function of a vector field
- sylent33
- · Replies 6 ·
Moment of Inertia with varying distance from Centre of Mass
- Ang09
- · Replies 8 ·
Work done against air resistance from kinetic energy change
- g9WfI
- · Replies 2 ·
Existential dilemma on angular velocity of a complex rigid body
- bhupesh
- · Replies 25 ·
Resistance Differences: Nichrome vs. Copper Wire
- ellieee
- · Replies 3 ·
Faraday's law -- How is the RHS required for all surfaces?
- millo
- · Replies 2 ·
What does a comma mean in this equation?
- danielsmith123123
- · Replies 3 ·
Relationship between material mass and weight
- The apprentice
- · Replies 5 ·
Gravity's Pull: How Far is the Proton Above the Electron?
- Johann0101
- · Replies 2 ·
To find the weight of a hemisphere
- gnits
- · Replies 13 ·
How Do Charges Separate on the Second Ball in Electrostatic Induction?
- vcsharp2003
- · Replies 20 ·
Why does the DC motor diagram omit field direction at points A and D?
- ellieee
- · Replies 3 ·
Why is proper length smaller in the particle frame for length contraction?
- Fernando Rios
- · Replies 3 ·
Momentum in different referance frames
- Murilo T
- · Replies 6 ·
Vectors - Aircraft's velocity relative to ground
- g9WfI
- · Replies 2 ·
Heat dissipation in an 80W computer with 5 litre/second airflow
- StillAnotherDave
- · Replies 11 ·
Uncharged capacitors connected in series
- vcsharp2003
- · Replies 18 ·
When Does the Amplitude Drop to 1/5 in Damped Harmonic Motion?
- meher4real
- · Replies 11 ·
Get the mass of an argon atom and its molecular weight from Cv
- Ron_H
- · Replies 8 ·
Complex circuit and its resistance
- Pouyan
- · Replies 26 ·
Why Does the Official Key State X=2.05 Instead of X=1 in This Adiabatic Process?
- bhupesh
- · Replies 32 ·
Connecting two charged capacitors in series
- vcsharp2003
- · Replies 21 ·
What should I consider when sketching a vector field?
- arhzz
- · Replies 17 ·
Is it true that a phone uses more energy than a refrigerator?
- ellieee
- · Replies 25 ·
Stopping an electron beam between parallel plates
- meher4real
- · Replies 58 ·
Accelerating Rockets in Different Frames of Reference
- eden24
- · Replies 5 ·
Electromagnetism and the movement of particles
- ellieee
- · Replies 8 ·
Moment of inertia composite body
- antonov
- · Replies 11 ·
Finding displacement from velocity in a projectile motion problem
- g9WfI
- · Replies 5 ·
How Do You Solve Equations with Variables V, U, and T?
- g9WfI
- · Replies 10 ·