Free introductory physics homework help step by step from qualified mentors. Algebra and calculus based general physics homework. High school and undergraduate level.
Threads
Where Is Zero Gravity Between Earth and Moon?
- nilic1
- · Replies 4 ·
Motion with Uniform Acceleration
- WannaLearn
- · Replies 7 ·
Tom and Jerry Space Travel: Calculating Speed & Weight
- TyErd
- · Replies 4 ·
Two antenas (two waves wih the same frequency)
- sameh1
- · Replies 4 ·
Rate of Change of electric field
- sdoyle1
- · Replies 2 ·
Pressure on Bottom of Test Tube: 71.442 Pa
- jefgreen
- · Replies 3 ·
Coefficient of friction (between road and wheels of accelerating truck)
- pmp
- · Replies 3 ·
Finding volume and density from spring scale readings in water
- jefgreen
- · Replies 22 ·
Finding the Coefficient of Kinetic Friction
- curser656
- · Replies 1 ·
Vector Situation: Find Shortest Time A to B (1000km)
- luysion
- · Replies 2 ·
Where does the -2 come from in Δp_x = -2mv cos(θ)?
- tanmandu
- · Replies 2 ·
Reducing Energy in an RC Capacitor: Solving for Discharge Time
- hover
- · Replies 2 ·
What is the induced emf in a coil with changing magnetic field?
- SavageWarrior
- · Replies 1 ·
Current density in wires connected in series
- CIERAcyanide
- · Replies 1 ·
Why does Kirchhoff's junction rule not equal zero in my ammeter readings?
- lha08
- · Replies 5 ·
Total Capacitance. Parallel or Series?
- ZedCar
- · Replies 10 ·
Find the total gravitational potential energy of this system?
- mattloverss
- · Replies 1 ·
Solving the F16 Jet Fighter Turning Circle Puzzle
- mgnymph
- · Replies 2 ·
What is the minimum sampling rate for a 3KHz bandwidth audio system?
- satchmo05
- · Replies 11 ·
Problem relating to the Heisenberg's Principle
- uzair_ha91
- · Replies 2 ·
Physics power question frustrating me
- thereddevils
- · Replies 6 ·
Maximum kinetic energy of oscillating mass on spring
- jeunesse27
- · Replies 3 ·
Electric circuit with resistors in series
- thereddevils
- · Replies 5 ·
Equation of motion with linear acceleration and velocity-squared drag
- darrencubitt
- · Replies 7 ·
Wavelength from diffraction grating with 5950 lines/cm at 18°
- buttermilkxxx
- · Replies 3 ·
Finding final pressure in isothermal free expansion with piston
- cowcow8866
- · Replies 5 ·
Lorentz Transformation/Time Dilation
- bon
- · Replies 17 ·
What Is the Maximum Force to Apply on a Sled Before a Penguin Slips Off?
- sonic91
- · Replies 5 ·
Calculate Tension in String for Frequency of 120Hz
- thereddevils
- · Replies 3 ·
Catapult Question: Force of Friction & Kinetic Energy
- TyErd
- · Replies 16 ·
Work Done by Tension: 2m Rope, 150g Tennis Ball
- cracka97
- · Replies 1 ·
Distance between the sun and earth
- TyErd
- · Replies 2 ·
Meter Circuit: Calculating Scale Reading with and without Additional Resistor
- thereddevils
- · Replies 2 ·
Thermodynamics, heat in a copper cube transfer to water
- thereddevils
- · Replies 1 ·
Electrical Potential of Semicircle Insulating Wire
- stod
- · Replies 1 ·
Spring question(just need answer checked)
- juggalomike
- · Replies 1 ·
A particle accelerating in both magnetic and electric fields
- joriarty
- · Replies 2 ·
Solve Motion Question for Frictionless Rollercoaster
- blueparukia
- · Replies 3 ·
Mass spectrometer velocity selector potential difference
- raindrops
- · Replies 3 ·
Centripedal acceleration and force question
- Lachlan1
- · Replies 1 ·
Acceleration of 2.0kg Block: Solve Forces/Tension Problem
- Dormin
- · Replies 2 ·
Thermodynamics - Find temperature of air in balloon
- thereddevils
- · Replies 3 ·
Finding Earth-Moon distance from orbital period and surface gravity
- RajdeepSingh7
- · Replies 1 ·
Two Slit Interference Question
- benk99nenm312
- · Replies 3 ·
How Is Heat Transfer Calculated in a Cylindrical Tube with Insulation?
- joemama69
- · Replies 2 ·
Ratio of translational velocity to rotational velocity.
- spursfan2110
- · Replies 1 ·
Energy conservation and string tension problem
- crybllrd
- · Replies 7 ·
Conservation of energy-Moving Charges
- Moongurl767
- · Replies 28 ·
Angular velocity of a falling rod?
- spursfan2110
- · Replies 3 ·
What is the area of the sun's image on the paper?
- jacksonpeeble
- · Replies 2 ·
Understanding Transistor Voltage Amplification
- Sigurdsson
- · Replies 3 ·
Which of the following are units of momentum?
- mettjl03
- · Replies 6 ·
Ferris wheel Rotational Kinematics Question
- fleabass123
- · Replies 13 ·
Difference between potential difference and voltage difference
- lha08
- · Replies 5 ·
Charge on capacitors each with a battery
- reset_7
- · Replies 8 ·
Momentum Qs: Find Girl & Skateboard Velocity After Jump
- crosbykins
- · Replies 1 ·
What was the speed of the Camaro after colliding with an Escort?
- sloanmp
- · Replies 1 ·
How Much Kinetic Energy is Stored in the Spring After a Collision?
- sloanmp
- · Replies 1 ·
How do pendulum length and location affect period and timekeeping?
- yeopar
- · Replies 1 ·
Rocket with mass ejection rate 60 kg/s: acceleration at start and after 29 s
- sloanmp
- · Replies 1 ·
Temperature(thermal radiation transfer)
- Ajwrighter
- · Replies 5 ·
Solving x+y=12 and xy=35 for two unknowns
- Strafespar
- · Replies 8 ·
Which ball has the highest velocity just before ground
- Sutitan
- · Replies 3 ·
What is the result of rotating an ellipse with eccentricity n2/n1 in optics?
- fluidistic
- · Replies 4 ·
Car climbing a hill: work, speed, and power with energy conservation
- xupe33jrm
- · Replies 6 ·
Finding Current in a Circuit with 3 Switches
- CIERAcyanide
- · Replies 1 ·
Dynamics - sled up a hill with several angles?
- optoracko
- · Replies 3 ·
Finding tension and deceleration of a 30 kg ball at θ = 20° on a pendulum
- red123
- · Replies 9 ·
Relative vectors - how do you determine?
- Trooper100
- · Replies 1 ·
Finding potential difference across resistor and battery internal resistance
- CIERAcyanide
- · Replies 2 ·
Finding Constant A for Independent Electric Field between Two Spheres
- yoni162
- · Replies 2 ·
Conservation of energy in elastic collision
- okgo
- · Replies 1 ·
How to Calculate the Number of Moles in a Gas Using the Ideal Gas Law?
- smashtheball
- · Replies 2 ·
Relating B and E in an electromagnetic wave
- Revvi
- · Replies 1 ·
Creating Friction Force vs. Normal Force Graph
- barthayn
- · Replies 1 ·
Why are there discrepancies in my circuit evaluation?
- master_mind
- · Replies 2 ·
Calculating Radial Acceleration in Olympic Hammer Throw
- physic1GUY
- · Replies 2 ·
How Does Charging a Ball Affect Its Pendulum Motion?
- einsteinette
- · Replies 1 ·
Miser's Gold: A Frozen Pond Rescue Plan
- crosbykins
- · Replies 2 ·
Recombination frequency and map units for two genes
- sonyab523
- · Replies 1 ·
Hanging Mass Acceleration and Tension Force
- aznboi855
- · Replies 4 ·
Two-ball collision with one ball moving at 30 degrees north
- anti404
- · Replies 5 ·
Determining impulse on baseball from bat given velocity change
- hcps-chent1
- · Replies 1 ·
Solving for Current in Resistor 2 at t = 4.00 ms
- keemosabi
- · Replies 1 ·
Why Doesn't Light Increase in Mass at High Speeds?
- idiosyncratic
- · Replies 3 ·
Finding induced emf in a decaying inductor current
- r_swayze
- · Replies 1 ·
I hope that helps. How far will Lisa compress the spring?
- octahedron
- · Replies 10 ·
Why Does Rotating Around the Y-Axis Require Less Work Than the Z-Axis?
- jwxie
- · Replies 1 ·
Solve Vector Plane Problem: Airplane to Lake 250 km Away
- Trooper100
- · Replies 1 ·
Understanding Electric Field and Potential in Capacitors
- lha08
- · Replies 1 ·
Range of wavelength from white light through a diffraction grating
- FLCL
- · Replies 1 ·
Rotation problem solved with conservation of energy.
- btbam91
- · Replies 1 ·
Magnitude/direction of the ball's acceleration
- 14h54
- · Replies 2 ·
Calculating Height of Stone Dropped from Rising Hot Air Balloon
- chuckset
- · Replies 2 ·
Calculating Work, Thermal Energy, and Heat Transfer for Hydrogen Gas
- Shayna
- · Replies 6 ·
Why Newton's third law forces don't cancel out
- Trooper100
- · Replies 9 ·
Calculating Potential Energy Changes in a Roller Coaster System
- Tmtamrak
- · Replies 3 ·
Finding how long a cyclist takes to stop after braking
- chuckset
- · Replies 1 ·
What is the temperature at the end of the process ?
- alireza83
- · Replies 2 ·
Capacitors: charge, potential difference and stored energy
- CIERAcyanide
- · Replies 2 ·