Free introductory physics homework help step by step from qualified mentors. Algebra and calculus based general physics homework. High school and undergraduate level.
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I am confused by the concept of space-time in special relativity
- rgtr
- · Replies 2 ·
Virial Theorem for an expanding globular cluster
- Barbequeman
- · Replies 3 ·
Why Doesn't the E*A Equation Work for Electric Flux in This Case?
- bluesteels
- · Replies 14 ·
Calculate Crumple Zone Rigidty?
- AJ22
- · Replies 3 ·
Quick question about which radius to use on Gauss' law problem
- bluesteels
- · Replies 3 ·
Finding ##x_c(t=0)## for a system of coupled Masses & Springs
- Redwaves
- · Replies 16 ·
Calculate Principal Inertias - Exercise Hint
- fabiancillo
- · Replies 5 ·
Free body diagram for an inverted pendulum in the rolling sphere
- GottfriedLenz
- · Replies 9 ·
How to find deceleration up incline
- xwalsh
- · Replies 2 ·
Question on Einstein's opening passage of relativity
- s__1000
- · Replies 18 ·
Initial acceleration problem: Two children on a frictionless floor
- Davidmb19
- · Replies 7 ·
Electric field due to a charged infinite conducting plate
- vcsharp2003
- · Replies 8 ·
Ball rolling down a slope ending with a loop
- Hendra
- · Replies 12 ·
Torque imposed by the Moon and Sun on the Earth given its precession
- ago01
- · Replies 6 ·
Falling and sliding stick (David Morin)
- Father_Ing
- · Replies 33 ·
Projectile Motion Experiment: Results Too High?
- burakyildiz
- · Replies 2 ·
Spring compression -- Ball colliding with a spring-mounted platform
- dge
- · Replies 2 ·
Why momentum of a ball bounced off a wall increases twice fold?
- Eobardrush
- · Replies 9 ·
Propagating Uncertainties in acceleration when using a video software
- Iwanttolearnphysics
- · Replies 6 ·
How Is the Second Leg of the Triangle Calculated in Vector Problem?
- NormalForce1
- · Replies 2 ·
Gauss's Law for a sphere with a cavity, solving for E(r)
- ThrawnGaming
- · Replies 15 ·
1D Elastic Collision between an Elephant and a Fly
- ObitoLegend
- · Replies 6 ·
Ball on a string (vertical circle)
- redlightgreen
- · Replies 2 ·
Find frequency such that two components have same average power
- Tobias Holm
- · Replies 4 ·
Quartic function of a non-ideal spring
- Semiclassical
- · Replies 1 ·
Where is the equilibrium point of a mass sliding down slacking cord?
- yucheng
- · Replies 15 ·
Why bulbs and LED diodes keep glowing after being switched off?
- pepediaz
- · Replies 21 ·
Magnitude of force acting on wedge and block
- dl447342
- · Replies 2 ·
The Quantum Uncertainty of a Particle
- maguss182
- · Replies 13 ·
To locate the centre of gravity of a rod
- gnits
- · Replies 5 ·
RL circuit after switch has been opened
- Ugnius
- · Replies 6 ·
Equivalent Capacitance and Resistance of this Circuit
- goutes1234
- · Replies 27 ·
An introductory question about special relativity
- Yink
- · Replies 1 ·
Newton's second law (My turtle named Newton being accelerated)
- rgtr
- · Replies 9 ·
Is the Spring Launching Equation Correct?
- physicsdude2
- · Replies 6 ·
Finding Spring Constant When Given Amplitude, Time, and Mass
- physicsneedslabs
- · Replies 9 ·
Particles moving on a regular hexagon
- Monsterboy
- · Replies 12 ·
How Does Torque Affect the Motion of a Disc Pulled Across a Table?
- ago01
- · Replies 3 ·
To find the distance of a horizontally suspended rod from a ceiling
- gnits
- · Replies 2 ·
Energy Efficiency Tips for Homeowners
- tomcajot
- · Replies 1 ·
Electric force due to a moving charge
- LCSphysicist
- · Replies 7 ·
Trajectory of a charged particle in the magnetic field (variable)
- acrobaticelectron
- · Replies 16 ·
Equation calculations about the coefficient of kinetic friction
- Javad
- · Replies 5 ·
Action Reaction Spring Scale Question
- Ineedhelpwithphysics
- · Replies 10 ·
Wrong sign in my answer, why? SR + Addition of velocity....
- LCSphysicist
- · Replies 3 ·
Help Me Solve This Khan Academy Question: Friction and Initial Velocity
- Iwanttolearnphysics
- · Replies 5 ·
Is Throwing a Knife with No Spin Actually More Effective?
- Aurelius120
- · Replies 4 ·
An object oscillating in simple harmonic motion
- lorenz0
- · Replies 6 ·
Why Does a Wheel Move and How Does Torque Influence Its Dynamics?
- erensatik
- · Replies 12 ·
Potential on each of these concentric spherical shells
- vcsharp2003
- · Replies 19 ·
What is the Conservation of Energy in Spring Work at an Angle?
- hayke101
- · Replies 9 ·
Trying to understand why I got this problem wrong
- Bruh
- · Replies 13 ·
Excel Worksheet problems -- Piston and connecting rod connected to a crankshaft
- Franklie001
- · Replies 10 ·
Vertical spring connected between two bodies with a rope above them
- physics1000
- · Replies 16 ·
Confused about calculating the average energy from a distribution graph
- ASKINGHUMAN
- · Replies 2 ·
Troubleshooting Interplanetary Cruise Calculations
- Viii
- · Replies 41 ·
Accelerating pulleys (3 pulleys and 3 masses)
- Yossi33
- · Replies 5 ·
Calculating work on an inclined plane
- Diana Rico
- · Replies 6 ·
Calculating the Force of a Jump on the Moon
- isaacwachsman
- · Replies 10 ·
Another Doubt From Halliday Resnick Krane -- Puck on a string in circular motion
- vibha_ganji
- · Replies 2 ·
Friction force on each foot and on each hand of a person
- dl447342
- · Replies 7 ·
Is the Angular Velocity of Pinned Rods Calculated Correctly?
- DrNG
- · Replies 5 ·
Charge density seen from a moving reference frame S' (SR + EM)
- LCSphysicist
- · Replies 1 ·
Determining displacement and acceleration: A physics problem
- kara123
- · Replies 14 ·
Potential energy, Wave function, Quantum physics
- HektorHusky
- · Replies 1 ·
Determine the final train speed (mass and slinky on a train)
- leafy
- · Replies 13 ·
Simple conceptual question about Ohm's law
- engineeringstudnt
- · Replies 15 ·
Conservation of linear momentum, undergrad particle dynamics
- greg_rack
- · Replies 3 ·
A fun, engaging and visual way of showing laminar flow for young kids
- LT72884
- · Replies 1 ·
Finding Friction Force & Work with No Applied Force
- kara123
- · Replies 8 ·
Relativity and Simultaneity: A Cosmic Perspective
- martinlodge1964
- · Replies 10 ·
What Is the Rate of Change of Acceleration at t=2?
- LT72884
- · Replies 8 ·
Uncertainty of pendulum period and pendulum length
- dobbygenius
- · Replies 7 ·
Calculating the center of mass as an astronaut moves on a shuttle
- ago01
- · Replies 5 ·
How Do You Find the Period of a Pendulum with a Length of 35 cm?
- blueyedblonde
- · Replies 3 ·
Triangle problem from Feynman's exercises
- czakun
- · Replies 5 ·
Calculate the net energy of this system (mass and Slinky in an elevator)
- leafy
- · Replies 3 ·
Evaluate reflectance of an aluminum mirror
- mcas
- · Replies 5 ·
About Work done when velocity is constant
- Iwanttolearnphysics
- · Replies 12 ·
Net efficiency of a cascaded Carnot Engine and Fridge
- baseballfan_ny
- · Replies 1 ·
Trajectory of an electron traveling near a current-carrying wire
- alesdiazdeo
- · Replies 4 ·
Concept not understood -- Car tires pushing the car forward....
- Ineedhelpwithphysics
- · Replies 6 ·
About KE and PE of a stone falling down a tube filled with oil
- Iwanttolearnphysics
- · Replies 10 ·
Angular kinematic problem -- An accelerating merry-go-round
- Nick tringali
- · Replies 8 ·
SHM Find amplitude from ω and x
- dahoom102
- · Replies 9 ·
Calculating a star's density profile
- Angela G
- · Replies 3 ·
Averaging the cube of semimajor axis to position ratio wrt to time
- antythingyani
- · Replies 9 ·
To find the modulus of elasticity of a light elastic string
- gnits
- · Replies 7 ·
How Does Mathematical Theory Explain Multiple Wave Reflections?
- Redwaves
- · Replies 8 ·
Dsa -- Two masses orbiting their barycenter
- antythingyani
- · Replies 2 ·
Finding the position of a middle charge to have Zero Net Force
- sylent33
- · Replies 9 ·
Need help with this unequal length bifilar pendulum
- dobbygenius
- · Replies 21 ·
Solving for Energy & Momentum in Physics Questions
- anto
- · Replies 2 ·
Mass and spring on an inclined plane
- Kenny555
- · Replies 4 ·
Calculate the angular velocity for each case
- leafy
- · Replies 5 ·
Force between charged Ring and Rod, disproved Newtons 3rd law?
- Hamiltonian
- · Replies 3 ·
Homework help : What object rotates at 90 RPM?
- sayo
- · Replies 3 ·
Solving Equilibrium w/ Plank & Forces | Physics Problem
- ago01
- · Replies 7 ·
Effect of Surface Area on the Drag Coefficient of a Parachute
- pasta-lord
- · Replies 6 ·