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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Does $\frac{\partial^2 L}{\partial q\partial \dot q}=0$?
- Leo Liu
- · Replies 11 ·
Two methods for magnitude and angle give different angle results
- davidwinth
- · Replies 7 ·
How to interpret the center of aero forces on a sports car?
- Rok
- · Replies 25 ·
Understanding Acceleration and Center of Mass in Shock Absorption
- ThEmptyTree
- · Replies 5 ·
Correlating albedo with temperature?
- AppleiPad556
- · Replies 6 ·
Calculating Forces on a Moved Body
- fisica15
- · Replies 29 ·
Deriving the Differential Position Vector in Cylindrical Coordinates
- Istiak
- · Replies 8 ·
Two Pulleys, two weights and a string
- Petersilie23
- · Replies 6 ·
Where am I going wrong with this vector addition?
- guyvsdcsniper
- · Replies 1 ·
Stopping a Bullet: Calculate umin and xf
- ThEmptyTree
- · Replies 3 ·
Find the value of ##\theta## when the Vx and Vy components are the same
- Istiak
- · Replies 12 ·
What is the final angular displacement of a disk hit by two masses?
- lorenz0
- · Replies 3 ·
Why does the battery lose more energy than the capacitor gains when charging?
- nazmulhasanshipon
- · Replies 5 ·
How Do Engineers Design AntiNoise to Effectively Reduce Ambient Noise?
- Decentralized
- · Replies 3 ·
Finding spacetime interval for Mike's trip to Pluto at 0.82c
- LCSphysicist
- · Replies 4 ·
Two Pulleys, Two Strings and Two Blocks
- ThEmptyTree
- · Replies 4 ·
Number of moles necessary to get piston back to initial position
- lorenz0
- · Replies 1 ·
Propagation Wave Expressions and Wave Velocity
- ashah99
- · Replies 9 ·
Induced current in a wire loop embedded in a changing B-field
- jjson775
- · Replies 12 ·
Why does Faraday's law predict the magnet experiences an opposing force?
- Marcin H
- · Replies 11 ·
Tangential velocity of rotating rod
- lorenz0
- · Replies 5 ·
How to find coordinates of a system (I am taking cylinder now)?
- Istiak
- · Replies 29 ·
Tension in rope wrapped around a rod
- ThEmptyTree
- · Replies 3 ·
Mass m sliding without friction inside a rotating tube
- lorenz0
- · Replies 27 ·
Capacitors in parallel or series
- vcsharp2003
- · Replies 22 ·
Finding the increase in entropy of the universe in gas expansion
- lorenz0
- · Replies 4 ·
What is the Young-Laplace equation and its relationship to surface tension?
- Shreya
- · Replies 13 ·
Block on a Spring, Nonconstant Net Force
- grandpa2390
- · Replies 6 ·
Current and resistance in the power loss of a transformer
- songoku
- · Replies 21 ·
Centripetal Motion problem -- A bead sliding around a horizontal loop
- Rubberduck2005
- · Replies 12 ·
Why does ½mu² = ½mv² + ½ms² in particle collisions?
- Disputationem
- · Replies 6 ·
How Can We Solve the Connected Bodies Problem with a Resultant Force of 39N?
- ayans2495
- · Replies 4 ·
Simple conceptual reference frame question
- Rubberduck2005
- · Replies 2 ·
Entropy change and heat transferred with S=a/T
- warhammer
- · Replies 2 ·
Why does a relativistic proton collision have a different scattering angle?
- mystreet123
- · Replies 4 ·
2 Dimensional Motion: Net force at an angle
- ayans2495
- · Replies 4 ·
Is the RMS Mean Free Path Equal to the Mean Free Path?
- warhammer
- · Replies 9 ·
Why position times mass is equal to 0 here (vanishes)?
- Istiak
- · Replies 2 ·
What is the best shape for a soccer goal post?
- kshitij
- · Replies 157 ·
A slightly complex pully problem missing the final step
- Rubberduck2005
- · Replies 6 ·
Dog Grooming Services""Dog Grooming: Your Pup's Pampering & Happiness
- ellieee
- · Replies 5 ·
Why is the unit vector φ̂ perpendicular in polar coordinates?
- Istiak
- · Replies 11 ·
Vectors along different coordinate axes
- Monsterboy
- · Replies 2 ·
Virtual displacement for a block sliding down a wedge
- Kashmir
- · Replies 3 ·
To find total work done from multiple reversible processes
- warhammer
- · Replies 3 ·
Graph of waveform across diode shown by CRO
- songoku
- · Replies 11 ·
Force required to hold a fire hose
- toothpaste666
- · Replies 13 ·
Relationship between magnitude of current and magnetic field
- ellieee
- · Replies 8 ·
How to find centroid of a hemisphere using Pappus's centroid theorem?
- kshitij
- · Replies 27 ·
Solving a modified Kepler potential using a rotating reference frame
- juardilag
- · Replies 1 ·
Kinematics: two runners with different and non-constant accelerations
- lorenz0
- · Replies 2 ·
Finding braking force on a car descending a slope
- warhammer
- · Replies 7 ·
Calculating Velocity when Stuntman Jumps from 1.25m Height
- Istiak
- · Replies 30 ·
Finding unknown amplitude and phase in sinusoidal equation
- MichaelTam
- · Replies 2 ·
Computing Errors when Data Sets are Given
- Wannabe Physicist
- · Replies 6 ·
Flux of a non-uniform E field through the face of a cube
- rudransh verma
- · Replies 14 ·
Where Is the Error in This Power Transmission Calculation?
- songoku
- · Replies 2 ·
Why does the helicopter power equation depend on how you calculate energy?
- phantomvommand
- · Replies 9 ·
Bead sliding on a Vertical Circular Loop versus in Free Fall
- Rubberduck2005
- · Replies 14 ·
How much of the wooden timber was submerged in water?
- Istiak
- · Replies 2 ·
Why used $\cos\theta$ for $\text{y}$ axis or, gravitational force?
- Istiak
- · Replies 2 ·
How many walls can this battery-powered crane lift before recharging?
- MichaelTam
- · Replies 14 ·
Electric Field on the surface of charged conducting spherical shell
- vcsharp2003
- · Replies 54 ·
Motion of Rolling Cylinder in Fixed Cylinder: Confusing Constraint Condition
- LCSphysicist
- · Replies 2 ·
Is w Constant in Damped Oscillations?
- Shreya
- · Replies 3 ·
Angular momentum of a particles in the form of ##L = mr^2\omega##
- Redwaves
- · Replies 3 ·
Maxwell's Distribution Law (Thermal Physics)
- warhammer
- · Replies 2 ·
How does antenna length L relate to EMF, Poynting vector, and power?
- LCSphysicist
- · Replies 11 ·
Linear Motion and Linear Momentum
- hairey94
- · Replies 31 ·
Why is Gauss' law written as ∇·E = 4πρ instead of ∇·E = ρ/ε₀?
- Leo Liu
- · Replies 6 ·
What is the R^3 in Kepler's 3rd Law?
- phantomvommand
- · Replies 7 ·
How to compute how much energy is released in nuclear fusion?
- Mestudyingphysics
- · Replies 1 ·
Relationship between B and induced EMF using Faraday's Law
- Einstein44
- · Replies 10 ·
IsaacPhysics - Climbing up a corner -
- fernihough
- · Replies 15 ·
Do water molecules move with the boat due to Newton's third law?
- songoku
- · Replies 4 ·
Efficiency of an Electric motor pulling a truck up an inclined plane
- Aaryan34532
- · Replies 7 ·
Comparison of Change in Entropy
- nazmulhasanshipon
- · Replies 18 ·
Equation connecting potential and potential energy of a distribution
- Leo Liu
- · Replies 5 ·
Tricky conceptual Projectile motion question
- Rubberduck2005
- · Replies 14 ·
Purcell EM textbook force integral on charged sphere
- Leo Liu
- · Replies 4 ·
Projectiles Question -- Tiger Woods drives a golf ball on the Moon
- rr96
- · Replies 23 ·
Reason for glass rod losing electrons
- vcsharp2003
- · Replies 8 ·
ODE Methods for Physicists (related question)
- profgabs05
- · Replies 4 ·
Question on First Law of Thermodynamics (Paramagnet)
- warhammer
- · Replies 1 ·
COVID-19: How to Stay Safe & Healthy
- ellieee
- · Replies 1 ·
How does mirror symmetry for resistance work?
- phantomvommand
- · Replies 7 ·
Finding my error in the moment of inertia of a sphere
- DeadInside
- · Replies 7 ·
Electric flux through ends of an imaginary cylinder
- vcsharp2003
- · Replies 7 ·
Converting V from GeV to meters in M_p^2 = M_s^3 V
- Safinaz
- · Replies 6 ·
How to picture a radial field around a 3d object?
- jackiepollock
- · Replies 3 ·
What are the Simplifying Assumptions for Calculating Eddy Current Forces?
- Einstein44
- · Replies 5 ·
What do ∂V and ∂S mean in Maxwell's equations?
- Hamiltonian
- · Replies 1 ·
2 Spheres of Charges and their Interaction
- Shreya
- · Replies 13 ·
Does a conducting sphere gain charge when rubbed against metal?
- ellieee
- · Replies 2 ·
Doppler shift between a moving ship on the ocean and a satellite in LEO
- nicolewreyford
- · Replies 14 ·
Calculating Magnetic Field Strength and Force of Eddy Currents in a Solenoid
- Einstein44
- · Replies 49 ·
Finding out the rotational speed of a mass
- nazmulhasanshipon
- · Replies 59 ·
What does negligible resistance mean?
- ellieee
- · Replies 3 ·
Node-Voltage Method for Calculating Power Delivered by Dependent Voltage Source
- orangeincup
- · Replies 6 ·
How to find the heat energy produced in a resistor?
- ellieee
- · Replies 3 ·