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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Finding Internal Resistance of a Battery
- Potatochip911
- · Replies 18 ·
Transformer current theory problem
- Ange98
- · Replies 2 ·
Collisions Impulse; Balls dropped from same height.
- AdkinsJr
- · Replies 2 ·
A basic conservation of energy question
- unified
- · Replies 10 ·
Motion of mass connected to a spring at constant velocity
- Holmez2_718
- · Replies 2 ·
Find I through one of three resistors in a 3-battery circuit
- kamhogo
- · Replies 6 ·
Why is length independent of young modulus ?
- Ysondh
- · Replies 2 ·
Checking my series and parallel circuit network solutions
- cvc121
- · Replies 1 ·
Power loss in transmission lines
- toforfiltum
- · Replies 20 ·
Finding velocity given potentials of two parallel plates
- Sho Kano
- · Replies 3 ·
Calculate this value of 1 mole at STP with C_V
- grandpa2390
- · Replies 22 ·
Difference between Rutherford and Bohr's theory of atom
- terryds
- · Replies 4 ·
Tennis ball dropped on basketball collision problem
- Biker
- · Replies 2 ·
Are Pressure Films Accurate in Measuring Impact Forces?
- APcraze
- · Replies 7 ·
Metal sphere drawn and then repelled by charged rod
- MonkeyDLuffy
- · Replies 2 ·
Moment of Inertia of dysprosium-160
- Guessit
- · Replies 1 ·
Energy and power costs (fill in the table)
- alexandria
- · Replies 12 ·
Are the sum of all forces written correctly for this system?
- Blockade
- · Replies 3 ·
Can someone check if this centripetal force is correct?
- Blockade
- · Replies 2 ·
Angle of reflection for light ray in gallium phosphide and water
- Carrie
- · Replies 4 ·
Volume Change in Phase Transitions
- Minihoudini
- · Replies 11 ·
Can someone check if this forces problem on an incline
- Blockade
- · Replies 4 ·
Double-grounded circuit, find I across one of two resistors
- kamhogo
- · Replies 15 ·
Linear Motion and Free Fall: Solving Projectile Motion Problems
- SuperNewb
- · Replies 4 ·
Spring and string pendulum (oscillations)
- JulienB
- · Replies 33 ·
Find % Light Through 3 Polarizers
- ScrubTier
- · Replies 6 ·
Why Is the Angle 90-theta in IBNpir^2sin(90-theta)?
- Dan453234
- · Replies 11 ·
Calculating the length of a string from a standing wave
- Thimble
- · Replies 4 ·
E-field of a Semi-spherical charge distribution with a hole
- sergioro
- · Replies 5 ·
Induced EMF in a Triangle: Determining EMF and External Force
- SataSata
- · Replies 3 ·
Using Gauss's Law on two separated, and infinite plates
- erick rocha
- · Replies 4 ·
Heat generated due to motion of wire in magnetic field
- Titan97
- · Replies 3 ·
Solve for Constant Torque: 75g-cm2 to Spin Yo-Yo to 300 rev/min in 1s
- reminiscent
- · Replies 3 ·
Bernoulli's equation to find the flow rate
- Sall1230
- · Replies 3 ·
Electric field strength between parallel plates at -50kV and 100kV
- KieranRC
- · Replies 3 ·
Linear momentum - Bullet fired vertically
- Kmol6
- · Replies 5 ·
Proving that net torque isn't reliant on point of rotation.
- P-Fry
- · Replies 1 ·
Why Is P1A1 Considered Positive in Fluid Force Calculations?
- foo9008
- · Replies 16 ·
What are the Coefficients for Isc and Voc in Photovoltaic Panels?
- says
- · Replies 8 ·
Optics - destructive interference
- ChuckB
- · Replies 6 ·
When can you use B times A for magnetic flux instead of integrating?
- Dan453234
- · Replies 2 ·
Thermodynamics: Irreversible process and entropy
- zanthia
- · Replies 1 ·
Can someone tell me how many forces of friction are in here?
- Blockade
- · Replies 17 ·
What does divergence of electric field = 0 mean?
- 15ongm
- · Replies 1 ·
Negative values of magnetic fields strength obtained?
- Mohummed Kazmi
- · Replies 1 ·
Using the right hand rule with symbols
- Scholar1
- · Replies 1 ·
Acid spraying from hole at base of cylindrical tank
- The-Mad-Lisper
- · Replies 1 ·
What's wrong with my math?[Thermal volume expansion]
- Kuzon
- · Replies 16 ·
Gravitational Energy Released from Sphere
- CedarPark
- · Replies 4 ·
Calculating Object Location for Converging Lens with M=-1
- Sall1230
- · Replies 1 ·
Thermal Equilibrium Temperature Question Sodium and Water
- RJLiberator
- · Replies 3 ·
Find the magnitude of the current density
- Sho Kano
- · Replies 11 ·
Angular speed and work for rotating Hubble telescope
- reminiscent
- · Replies 10 ·
How Does Snell's Law Affect Color Dispersion in a Window Pane?
- OhBoy
- · Replies 10 ·
Equivalent resistance between a and b -- Complex circuit
- kamhogo
- · Replies 19 ·
Ring launcher conceptual question
- Physicsnoob24
- · Replies 1 ·
How Do You Calculate Cosine Theta from Work, Force, and Distance?
- Lord Amirul
- · Replies 7 ·
Centre of mass of this boomerang?
- gamma-guy
- · Replies 3 ·
The Magnetic Force on an Iron Ring
- Arkthanon
- · Replies 6 ·
Motion of a point is equal to dynamic harmonic oscilation
- prehisto
- · Replies 5 ·
Coulomb's Law and the Force Between Charged Bodies Across Vast Distances
- AeroKaro
- · Replies 4 ·
Vibrating Strings: Determining Wave Speed From Eq of Best Fit
- Marcin H
- · Replies 1 ·
When is the angle between force and displacement 90°-α or α?
- Blockade
- · Replies 14 ·
Using right hand rule 1 to find direction of magnetic field
- Scholar1
- · Replies 3 ·
Potential energy stored in a dipole
- ahmed alaraby
- · Replies 2 ·
Moment of thin Rod at pivot when acted upon by a Force
- Narwhalest
- · Replies 1 ·
Rotation of a block when not in equilibrium
- Soren4
- · Replies 4 ·
Effect of density on rms speed in ideal gas eqn
- toforfiltum
- · Replies 3 ·
Finding maximum deflection time in sine wave function y=3sin(800πt+π/3)
- Nanu Nana
- · Replies 6 ·
How Long Will it Take to Heat Water Using a Solar Heater?
- Jefffff
- · Replies 2 ·
Rayleigh criterion (two wavelengths) + diffraction grating
- velkyr
- · Replies 4 ·
Two blocks on a frictionless surface; find the force
- Peter Halsall
- · Replies 3 ·
Radius and period of charge in B field
- velocity9
- · Replies 12 ·
Finding Jupiters Mass with one of its Moons
- wiegetz
- · Replies 1 ·
New capacitance when dielectric material covers bottom half
- Koh Eng Kiat
- · Replies 6 ·
Describe absorption experiment to distinguish 3 radiations
- YES q THE zU19
- · Replies 4 ·
Why do bicycles require more pedaling force at higher speeds?
- TT0
- · Replies 12 ·
Rotational work done by static friction?
- Soren4
- · Replies 5 ·
Time for capacitor charging in RLC circuit.
- Rts11
- · Replies 3 ·
Basic 1-d dynamics with a bit of calculus.
- sanhuy
- · Replies 6 ·
Two masses colliding with a spring between them
- Obliv
- · Replies 2 ·
Initial energy stored in springy steel before oscillating
- Janiceleong26
- · Replies 13 ·
Net acceleration, free body diagrams, velocity, force normal
- alexandria
- · Replies 6 ·
Justifying Ampere's Law and Faradays Law with an experiment
- PhotonSSBM
- · Replies 1 ·
Why is piston oscillation in an isolated cylinder adiabatic?
- vijayramakrishnan
- · Replies 2 ·
Max Mass Dresser Liftable w/ 150N Force - 46kg
- gmichel395
- · Replies 5 ·
Electric field lines from a metal shell and sphere
- Sho Kano
- · Replies 3 ·
Identical bulbs, order them brightest to dimmest
- kamhogo
- · Replies 13 ·
Challenging question on impulse (or momentum)
- i_hate_math
- · Replies 4 ·
What are the roles of friction and footwear in bob-sledding?
- alexandria
- · Replies 4 ·
Short circuit current and Open circuit voltage -- Illumination
- says
- · Replies 4 ·
Torque on barbell when angular momentum is not constant
- Soren4
- · Replies 12 ·
Solve Bernoulli Problem: Velocity of Water Outlet
- Sall1230
- · Replies 1 ·
Why does lamp resistance differ at 6V versus 230V?
- MBBphys
- · Replies 1 ·
Calorimetry Problem: Finding Final Temperature and Phase Change
- CherryWine
- · Replies 2 ·
Magnetic flux through a loop with two fields decreasing
- Jus10
- · Replies 4 ·
Is the Magnetic Field Strength Increasing or Decreasing?
- Jus10
- · Replies 11 ·
In expressing Internal Energy, how do I get to the next step
- grandpa2390
- · Replies 34 ·
What Are the Spring and Friction Constants for a Small Truck's Shock Absorbers?
- JulienB
- · Replies 4 ·
Derivative of self-energy in Peskin Schroeder equation 7.31
- dosantos86
- · Replies 1 ·