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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When is the center of mass frame inertial for two accelerating cars?
- yoni162
- · Replies 5 ·
How do I linearize radioactive decay data to find the decay constant?
- jumbogala
- · Replies 4 ·
What is the Spring Constant for a Compressed Mass on a Vertical Spring?
- shahar_rod
- · Replies 3 ·
A rope hanging over edge of table.
- myaaxcore
- · Replies 4 ·
Why do clothes become darker when wet?
- DanicaK
- · Replies 2 ·
Drawing a Force-Time Curve for a Changing Force and Calculating Final Momentum
- gold123456th
- · Replies 3 ·
Normal Force and Acceleration down the slope
- lazyguy91
- · Replies 1 ·
Doppler Effect Wind: Frequency, Velocity, Wavelength
- sachin123
- · Replies 3 ·
Linear expantion and elastic modulus- brass vs. glass
- mmoadi
- · Replies 2 ·
Momentum and Energy problem (ball and incline collision)
- Idoke
- · Replies 5 ·
Heat loss problem- thermodynamics
- mmoadi
- · Replies 2 ·
Curvature of path made by electron in electromagnetism
- Mspike6
- · Replies 1 ·
Interferometer / Index of Refraction
- hm29168
- · Replies 6 ·
Transformer Voltage vs. Frequency
- sus4nx
- · Replies 1 ·
Calculating Material Thickness: 5k Ohms CSA 10mm x 20mm
- Kev1n
- · Replies 5 ·
Measurements with an Ammeter/Voltmeter
- jumbogala
- · Replies 1 ·
Rotational Motion and linear accerlation
- scoldham
- · Replies 16 ·
Average acceleration of a falling ball on contact with floor
- bryansonex
- · Replies 2 ·
Block sliding down an inclined plane and gravity
- tbcreighton
- · Replies 3 ·
Ball caught in cup on rotating board dropped from angle θ
- datdo
- · Replies 8 ·
Calculating Tension on 500kg Beam Supported by Cable
- yankees26an
- · Replies 6 ·
Angular momentum of object at position (0,9,0) with velocity (4i-2j) m/s
- yankees26an
- · Replies 7 ·
What is the magnetic field produced by an electron beam in a cathodic ray tube?
- fishingspree2
- · Replies 5 ·
How to Calculate Coefficient of Kinetic Friction?
- HardestPart
- · Replies 3 ·
What is the angle of a falling object's velocity after 2 seconds?
- yankees26an
- · Replies 5 ·
Calculating the Force of Static Friction on a 2000kg Car
- yankees26an
- · Replies 4 ·
Work of Rope on Skier on 12° Incline: 900 J or 2,000 J?
- MIA6
- · Replies 3 ·
Food-energy to Mechanical Energy
- raiderIV
- · Replies 2 ·
Energy from the sun that reaches the earth
- Backup
- · Replies 4 ·
Calculating Average Net Force of 810-kg Car
- brncsfns5621
- · Replies 7 ·
Maximum spring compression when 2 kg block collides with 5 kg block
- Jngo22
- · Replies 1 ·
How Is the Tangential Force Calculated in Rotational Dynamics?
- Swatch
- · Replies 7 ·
How Long Until Two Accelerating Cars Are 200m Apart?
- 1irishman
- · Replies 22 ·
Where to find practice tests for introductory physics conceptual exams
- DavidDishere
- · Replies 1 ·
Finding the Coefficient of Friction?
- Brodo17
- · Replies 2 ·
Solving Pulleys and Tension Problems
- Bluesroo
- · Replies 6 ·
Calculating Current in DC Motor at 11V, 2000 RPM
- farry1024
- · Replies 1 ·
Bowl draining time doesn't match experiment with Torricelli's law
- sting10
- · Replies 1 ·
Crank-Nicolson method for a parabolic differential equation
- jamesponty
- · Replies 8 ·
Direction of current in a solenoid when magnetic field is switched off
- defetey
- · Replies 1 ·
Santa Claus and his trouble on a ladder
- rpullo
- · Replies 2 ·
The physics of a swinging door
- Idrees
- · Replies 17 ·
Oscillation Period in a Lighthouse?
- wmrunner24
- · Replies 1 ·
Five momentum and collision problems with inelastic collisions
- physicsisfunn
- · Replies 1 ·
Sound intensity and the hearing distance
- mmoadi
- · Replies 7 ·
Why Does 0 Velocity and Negative Acceleration = Increasing Speed?
- Love_to_Learn
- · Replies 4 ·
Combining Formulas: Rearrange Equations for F (No Ev)
- gareth01422
- · Replies 5 ·
Modified Atwood's Machine on an Inclined Plane
- Labrack
- · Replies 3 ·
Minimum Coefficient of static friction to keep a block from sliding?
- Brodo17
- · Replies 2 ·
Placements of vector diagrams and angles in 2-D collisions
- JohnMC
- · Replies 1 ·
Creating the Graph of a Position Function
- Love_to_Learn
- · Replies 8 ·
Finding current through shared branch using Kirchhoff's laws
- urduworld
- · Replies 8 ·
What is the Time Equation for Constant Acceleration?
- kriegera
- · Replies 6 ·
Which of these spring systems is equivalent?
- MarkH748
- · Replies 1 ·
Calculating Velocity Using Spring Force and Energy Conservation
- driven4rhythm
- · Replies 4 ·
Acceleration and velocity of a car
- skp123
- · Replies 5 ·
What was the speed before the collision?
- Fatentity
- · Replies 2 ·
How Much Coal Must Be Burned in a Steam Power Plant to Generate 900 MW?
- GreenPrint
- · Replies 37 ·
How Far Is the Moon from Earth?
- Blair08
- · Replies 6 ·
Objects falling towarda each other.
- E92M3
- · Replies 17 ·
Shooting a spaceship with a photon
- E92M3
- · Replies 3 ·
Force needed for straight-line motion in rotating coordinates
- E92M3
- · Replies 2 ·
Potential Difference and Electric Potential
- johnnyies
- · Replies 3 ·
Second Law of Thermodynamics - Entropy
- Tynged
- · Replies 1 ·
RC and RL(frequency and potential difference)
- SAT2400
- · Replies 3 ·
Buoyancy of ship, volume displaced, and tension of crane (in/out) of water
- orbits
- · Replies 2 ·
Minimum rotation speed for a conical pendulum
- ideasrule
- · Replies 3 ·
Gravitational forces from the moon and sun on a mass
- Trizz
- · Replies 11 ·
How much time has elapsed when the cars are 200m apart?
- 1irishman
- · Replies 10 ·
Simple Harmonic Motion: Oscillator
- TJC747
- · Replies 2 ·
Physics and Environment Questions
- HUgals
- · Replies 1 ·
Springs: Simple Harmonic Motion
- TJC747
- · Replies 1 ·
Calculating Heat and Time for 150g Water and 50g Ice System at 0C to Reach 100C
- Dan Feerst
- · Replies 7 ·
Simple Harmonic Motion: Spring Motion
- TJC747
- · Replies 1 ·
How Can I Solve the Rocket Motion Equation Numerically Using Maple?
- Dulle
- · Replies 1 ·
Net Force Required During Tiger-Rat Pursuit
- STL10
- · Replies 1 ·
Gun at origin firing at wall 18m away: minimum speed and hitting 3m high
- bbhh
- · Replies 7 ·
Fisherman pulling a crate on frictionless ice
- rent981
- · Replies 7 ·
What is the recoil speed of the rifle?
- jazzysoshort
- · Replies 4 ·
Simple Harmonic Motion: Pendulum
- TJC747
- · Replies 1 ·
How Much Force Does Water Exert on a Sandbag Dropped from 315m?
- Brittykitty
- · Replies 1 ·
Concept question, coil spring and energy.
- balletgirl
- · Replies 1 ·
What is the acceleration of a block on an inclined plane with friction?
- Gilded
- · Replies 5 ·
What Is the Maximum Oscillation Amplitude for an Ultrasonic Transducer?
- TJC747
- · Replies 1 ·
How do i work out the magnitude of a force
- ems1312
- · Replies 16 ·
How Do You Calculate the Moment of Inertia of a Spinning Disc with Added Mass?
- ems1312
- · Replies 3 ·
How Does the Doppler Effect Alter the Sound of a Horn from a Moving Truck?
- Moroni
- · Replies 2 ·
Calculating Centripetal Force for a Bull in Orbit
- Bjarne
- · Replies 3 ·
Caculating the tention, max accaleration and velocity of a violin string
- mmoadi
- · Replies 2 ·
Find the tension in the cable linking the two carts.
- ryty
- · Replies 3 ·
How Can I Solve This Dynamics Problem Involving Friction and Inclined Planes?
- JakePearson
- · Replies 4 ·
Partial pressures of ideal gases in a mixture
- itsascience
- · Replies 2 ·
Ski Slope using Energy Conservation
- merzperson
- · Replies 3 ·
How do I calculate the missing force on an aircraft?
- justice25
- · Replies 7 ·
Ballistic pendulum change in kinetic energy problem
- victoriafello
- · Replies 4 ·
Finding acceleration and velocity for three masses with a pulley system
- jamesdubya
- · Replies 22 ·
Calculating the Dipole Moment of LiBr
- stacker
- · Replies 3 ·
How Does a Block's Motion Change on an Inclined Ramp with Friction?
- justbreathe87
- · Replies 1 ·
Moment of inertia and conservation of energy problem
- knowlewj01
- · Replies 8 ·
Collinearity of Points: Solving the Equation
- thepopasmurf
- · Replies 2 ·