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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Why Does the Electric Field Sum Instead of Cancel with Opposite Charges?
- hello721
- · Replies 6 ·
The density of a proton (hydrogen nucleus)
- mrcake
- · Replies 9 ·
Why are tension and friction in the same direction?
- pibbler
- · Replies 6 ·
Using Seismic Waves detected at 4 Seismometers to determine the Epicenter
- Ira_anabelle
- · Replies 4 ·
Relative motion with constant acceleration
- MatinSAR
- · Replies 8 ·
Relative velocity and projectile motion problem solving
- SAM31
- · Replies 7 ·
Rounding to significant figures
- Skalvig
- · Replies 12 ·
Electric field needed to tear a conducting sphere
- ermia
- · Replies 11 ·
Omission of parts of equations in solving oscillation questions
- Student084
- · Replies 8 ·
Nodal analysis of this circuit with 2 sources and 4 resistors
- Iqish
- · Replies 12 ·
What levels result from a 4F term
- physicisttobe
- · Replies 1 ·
A cylinder with cross-section area A floats with its long axis vertical
- BlackPhysics
- · Replies 71 ·
Angular velocity and tangential velocity relationship
- Nathi ORea
- · Replies 7 ·
How does the mass of cylinder B compare to the mass of block A?
- Differentiate it
- · Replies 4 ·
Plane Traveling against the wind
- larrylancaster
- · Replies 4 ·
Understanding the Steps to Relativistic Momentum
- ozni
- · Replies 7 ·
How Does the Wedge's Movement Change with the Disk's Motion Upward?
- Rikudo
- · Replies 27 ·
Escape velocity equation constant error in multiple choice problem
- maxelcat
- · Replies 4 ·
Relative Velocity Against the Water Current
- unoonu
- · Replies 9 ·
Gravitational field of a hollow sphere
- Rikudo
- · Replies 5 ·
Conversion using factor label method
- rose ah
- · Replies 3 ·
How Do You Mathematically Determine the Highest Point of a Pendulum?
- jackkk_gatz
- · Replies 41 ·
Two workers pull horizontally on a heavy box
- rstor
- · Replies 15 ·
Newton's 2nd Law: Why is Resistance Considered a Positive Force?
- Fakhro
- · Replies 3 ·
Electric field of a part of a hemisphere
- ermia
- · Replies 1 ·
Friction problem in HS physics -- Mass moving on an inclined plane
- yungman
- · Replies 15 ·
Which ball bearing reaches the lower corner first on the inclined rectangular tube?
- Jackie Ma
- · Replies 14 ·
EE: How to heat a magnet with a wire while levitating a superconductor?
- SBrownJC
- · Replies 14 ·
Choosing what consists of a "system" in Newton's laws of motion
- sachin
- · Replies 28 ·
EMF produced across one side of a coil
- songoku
- · Replies 13 ·
EMF Induced by Changing Magnetic Field
- BrandonInFlorida
- · Replies 8 ·
EMF when a loop is pulled away from a current-carrying wire
- guyvsdcsniper
- · Replies 5 ·
EMF produced by generator of a car
- songoku
- · Replies 7 ·
Angular Acceleration of a Pulley Supporting Two Hanging Masses
- wingman358
- · Replies 3 ·
How can position from part i be reached without air resistance in part ii?
- theredbarronmvr
- · Replies 3 ·
Average Separation between molecules in hydrogen at STP (Alonso Finn Problem)
- agnimusayoti
- · Replies 17 ·
Vibrational Levels in Molecular Electronic State
- guyvsdcsniper
- · Replies 1 ·
Why is magnetic field B along a straight wire circular not radial?
- warrenchu000
- · Replies 14 ·
Using Gauss's Law to Calculate Charge Density Function
- james weaver
- · Replies 10 ·
Magnetic flux with magnetic field changing direction
- besebenomo
- · Replies 7 ·
Moving bar enclosing a changing magnetic field generates a current
- besebenomo
- · Replies 6 ·
Gas law problem (changing volume, temperature and pressure)
- Tasha Clifford
- · Replies 33 ·
Correct vector diagram of forces
- songoku
- · Replies 3 ·
Second moment of area of a hollow cylindrical arc
- NancyHadad
- · Replies 1 ·
Questioning the Solution for Elevator vs Rock Problem
- Darkmisc
- · Replies 7 ·
Magnetic flux of magnetic field changing as a function of time
- besebenomo
- · Replies 3 ·
Calculate velocity in a "simple electric train"
- raymondd
- · Replies 1 ·
Direction of motion under the influence of friction
- sachin
- · Replies 11 ·
Correct statement about elastic collision
- songoku
- · Replies 20 ·
Applying the Work-Energy theorem to a system
- sachin
- · Replies 9 ·
Converting centrifugal acceleration to frequency
- NODARman
- · Replies 10 ·
Are Individual Normals Irrelevant in Solving a Pulley and Wedge System?
- Differentiate it
- · Replies 47 ·
Friction causes a torque - then why do we sum it as a regular force?
- Differentiate it
- · Replies 4 ·
Upper block collides with wall and transfers momentum to lower block
- Rikudo
- · Replies 15 ·
A counterintuitive Laws of Motion problem
- Differentiate it
- · Replies 8 ·
Interpreting the various tracks in a hydrogen bubble chamber
- songoku
- · Replies 9 ·
Normalizing the wave function of the electron in hydrogen
- Cocoleia
- · Replies 10 ·
How to Calculate Thermodynamic Equilibrium using Basic Principles
- xiaoyaozizai
- · Replies 7 ·
What Formula Should I Use for Coefficient of Volume Expansion?
- xiaoyaozizai
- · Replies 1 ·
Ultimate tensile stress of material
- songoku
- · Replies 6 ·
Current calculation of a Y-junction
- simphysics
- · Replies 4 ·
How can l prove that Newton's laws are time invariant?
- stefano77
- · Replies 2 ·
Why am I off by a factor of 1000 in my fission energy calculation?
- songoku
- · Replies 6 ·
Required force to hold or pull inclined object downwards.
- AK93
- · Replies 5 ·
Least count error Vs Least count
- vcsharp2003
- · Replies 1 ·
Fictitious force in a binary stars
- Rikudo
- · Replies 1 ·
Find the Upward Force of a Boat with 6 People Aboard
- gjh
- · Replies 11 ·
Maximum duration of Solar eclipses
- Pigkappa
- · Replies 10 ·
Spring force on submerged wooden cube: 4N or 6N
- MatinSAR
- · Replies 9 ·
How Does the Sign of ##dm## Affect Rocket Propulsion Calculations?
- Rikudo
- · Replies 14 ·
What are the different types of vacuum pumps used in labs?
- Elizabeth111
- · Replies 9 ·
Resultant pedal force (FRESULTANT) Force tangential to the crank arm
- david03
- · Replies 1 ·
How to calculate resultant force for a bike pedal stroke
- Toby
- · Replies 6 ·
Kinetic energy of a composite body
- Rikudo
- · Replies 11 ·
Find the magnitude and direction of the velocity
- inigooo
- · Replies 76 ·
Time to reach Max. Height for a kicked soccer ball
- physicsstudent111
- · Replies 8 ·
What Determines the Direction of Motion in a Plank and Spring System?
- Rikudo
- · Replies 6 ·
Induced EMF due to motion of a wire perpendicular to a magnetic field
- phymath7
- · Replies 18 ·
Motion of center of mass under gravity
- sachin
- · Replies 10 ·
Question regarding Rolling with and without Slipping and Sliding
- Harikesh_33
- · Replies 4 ·
System curve and Bernoulli equation problem
- spinoza
- · Replies 1 ·
Getting wrong answer in an (angular) impulse momentum problem
- Divya
- · Replies 3 ·
Newton's laws--Block sliding up a frictionless semi-circular track
- sachin
- · Replies 37 ·
Essay topic suggestions for classical mechanics
- SaintRodriguez
- · Replies 13 ·
Rocket Escape Velocity from the Earth-Sun system
- Rikudo
- · Replies 3 ·
Why does a perforated cathode allow anode rays to be detected?
- Iqraasgherali
- · Replies 1 ·
How does energy affect the melting point of water?
- physicsstudent111
- · Replies 8 ·
Is the Calculation of Thermal Energy in Mixing Water and Steam Accurate?
- physicsstudent111
- · Replies 4 ·
Calculating eletric potential using line integral of electric field
- pedromatias
- · Replies 1 ·
Where will the masses lose contact?
- Rikudo
- · Replies 8 ·
Why is energy conserved when a mass leaves a moving slide?
- Rikudo
- · Replies 44 ·
What Is the Maximum Acceleration of a Crate Up an Incline Before Tipping Over?
- Vladimir_Kitanov
- · Replies 15 ·
Is the pressure everywhere on the inflated fluid pad the same?
- Kevin Cheung
- · Replies 1 ·
Why do I have to take the moment at the cut to get the right answer?
- Svelte1
- · Replies 2 ·
How Much Work to Fill a Cylindrical Tank with Water?
- thatboi
- · Replies 22 ·
Finding both temperature and the amount of gas added
- lorenz0
- · Replies 6 ·
Measuring Pressure on a Concrete Table
- Kevin Cheung
- · Replies 11 ·
Initial velocity and angle when a ball is kicked over a 3m fence
- simphys
- · Replies 62 ·
Light beam fired in a moving train (relativity)
- Aristarchus_
- · Replies 23 ·
Two persons headed towards the black hole horizon
- Aristarchus_
- · Replies 25 ·