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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Can Duct Tape Really Hold a Person Against a Wall?
- barrywhite
- · Replies 1 ·
Kirchhoff's Rule: Find Current in Resistors
- phunphysics2
- · Replies 1 ·
Find forces acting on a combined beam with load.
- dreamliner
- · Replies 4 ·
Why is it hard to discover new energy sources?
- Miyz
- · Replies 6 ·
Finding ratio of smaller terminal velocity to larger terminal velocity
- rockchalk1312
- · Replies 6 ·
Find Height of Ramp: H=1.0m, d=1.0m, θ=30°
- onelildustbunn
- · Replies 3 ·
What is the acceleration of block C in a system of connected blocks and pulleys?
- Saitama
- · Replies 26 ·
Projectile Motion highest point
- aaronfue
- · Replies 6 ·
Minimum coefficient of friction to keep cars from sliding off the road
- rockchalk1312
- · Replies 1 ·
Solving Thin Film Problem: Find Longest Wavelength Transmitted to Diver
- idkgirl
- · Replies 1 ·
How Long Does It Take for a Particle to Travel Through an Earth-Crossing Tunnel?
- Avi1995
- · Replies 10 ·
Field Goal Projectile Motion Problem: Calculating Angle and Speed for NFL Kicker
- Toranc3
- · Replies 2 ·
How much energy do we need to vapourize 1 liter of water?
- charlie95
- · Replies 6 ·
Finding shot put release speed from distance and angle
- Toranc3
- · Replies 1 ·
Power factor calculation: why subtract 0.65 from 1?
- freshbox
- · Replies 15 ·
Two charged spheres are brought into physical contact with each other.
- alittlelost
- · Replies 4 ·
Finding the magnitude and direction in a electric field.
- Trap_Shooter
- · Replies 3 ·
Equivalent Electri Force, Find the charge.
- pmd28
- · Replies 3 ·
Special relativity relating 3 dimensions
- Eats Dirt
- · Replies 3 ·
Finding distance and charge ratio from zero potential points
- pmd28
- · Replies 9 ·
Finding magnitude and angle of A+B-C with given angles
- Stanc
- · Replies 5 ·
What Is the Distance Between the Slits in Young's Double Slit Experiment?
- idkgirl
- · Replies 3 ·
Net electrical flux on a cylindrical Gaussian Surface
- Broem
- · Replies 2 ·
What is the difference between potential and potential difference?
- Chase25
- · Replies 3 ·
Path difference in reflection grating constructive interference
- Enthusiast94
- · Replies 13 ·
Question on Simple Harmonic Motion.
- Wesc
- · Replies 2 ·
Projectile Motion distance problem
- aaronfue
- · Replies 9 ·
Calculate evenly distributed force on a beam
- dreamliner
- · Replies 1 ·
Balloon Thermo/buoyancy question
- efekwulsemmay
- · Replies 3 ·
Question on aperture and magnitude.
- garyd
- · Replies 4 ·
Where should foam mats be placed for a stuntwoman dropped from a moving helicopter
- Toranc3
- · Replies 9 ·
Find electric field strength between disks
- johnnyboy53
- · Replies 4 ·
Calculating Time for Electron to Slow Down in Electric Field
- Colts
- · Replies 5 ·
Finding unknown force P when particle is in equilibrium
- FaraDazed
- · Replies 12 ·
Find Initial Velocity from Angle and Horizontal Distance
- IcyDuck
- · Replies 1 ·
Conservation of Angular Momentum bicycle problem
- pogo2065
- · Replies 9 ·
How Fast Must a Passenger Train Decelerate to Avoid a Crash?
- Woolyabyss
- · Replies 3 ·
How Should Angles Be Used in Calculating Tension Forces?
- cbchapm2
- · Replies 3 ·
Finding equilibrium force when two wires pull at 14 degrees below horizontal
- cbchapm2
- · Replies 10 ·
Finding Wind Velocity for a Westward-Bound Airplane
- Toranc3
- · Replies 8 ·
Calculating Energy and Momentum in Different Frames
- PirateFan308
- · Replies 2 ·
Electric field at the semi-circle's center
- Colts
- · Replies 3 ·
Electrostatics and Coulumb's law, potentials and test charges
- Plasmosis1
- · Replies 1 ·
Which has greater frequency: Moon's orbit around Earth or Earth's orbit around Sun?
- Meowserkitty
- · Replies 1 ·
How Does Changing Plate Distance Affect Interference Patterns in Interferometry?
- binbagsss
- · Replies 1 ·
How does water rise to form clouds if oxygen is heavier than nitrogen?
- channel1
- · Replies 4 ·
Velocity of cart after seperation
- jimmyly
- · Replies 2 ·
Thermodynamics (final temperature, ice mixed with steam)
- SigFig
- · Replies 3 ·
Momentum on an Inclined Plane: Understanding Conservation and Directionality
- bd2015
- · Replies 2 ·
Eliminate T to Show SHM of a Rectangular Plate
- Avi1995
- · Replies 7 ·
Why electrons carry energy but not current in thermal conduction
- heycoa
- · Replies 3 ·
How do you find the electric potential from force?
- Mitocarta
- · Replies 3 ·
Determining Beam Diameter in Glass Using Index of Refraction
- heycoa
- · Replies 12 ·
Electrostatic potential at a point outside a sphere
- adam199
- · Replies 1 ·
Diodes in parallel with resistors and terminal PD
- mrcotton
- · Replies 5 ·
Interferometer and Interference.
- binbagsss
- · Replies 7 ·
Why do I get two different answers for acceleration on a strange planet?
- iRaid
- · Replies 6 ·
Electromagnetic wave equation not invariant under galilean trans.
- bfusco
- · Replies 3 ·
When is Electric Potential equal to 0?
- dwk17
- · Replies 3 ·
Probability of finding a particle in a box
- ahhppull
- · Replies 2 ·
Equation check: Dimensional analysis.
- Beer-monster
- · Replies 3 ·
Modifying an equation to plot a straight line.
- thatguythere
- · Replies 7 ·
Fluid flow through a pipe - Conservation of mass and/or momentum?
- theBEAST
- · Replies 1 ·
Sliding Ramp and Freefall problem
- Shaku
- · Replies 54 ·
How many passages to enrich uranium-235 to 99% purity?
- CAF123
- · Replies 4 ·
How does friction work on a smooth slope with rough contacts?
- shalikadm
- · Replies 2 ·
Prove Period of a Rocking Hemisphere of Radius R is Equal to 4R/3
- Karol
- · Replies 26 ·
Newton's Laws and Force Problem
- Yosty22
- · Replies 1 ·
Police car catching speeding driver at constant velocity
- chrisweikert
- · Replies 1 ·
How Does a Perturbed Electric Dipole Exhibit Simple Harmonic Motion?
- CAF123
- · Replies 4 ·
Finding time period and minimum length of threads
- Saitama
- · Replies 2 ·
Is Back EMF Always Equal to Battery EMF in Inductive Circuits?
- harsh95
- · Replies 3 ·
Finding Electric Field from Long Filament
- Bashyboy
- · Replies 5 ·
Calculating Tension in Multiple String Systems
- kaffekjele
- · Replies 6 ·
Finding Force of an electron in motion
- mrye33
- · Replies 1 ·
Does the angle need dividing when inverting complex impedance?
- freshbox
- · Replies 9 ·
Finding R and C values from impedance and angular frequency
- freshbox
- · Replies 10 ·
What is the induced emf in one of the windings?
- lizaliiu
- · Replies 3 ·
Charge on two suspended metal balls
- crowdedscience
- · Replies 5 ·
How do I calculate watts for household appliances?
- njuice8
- · Replies 3 ·
Entropy and Black Hole Temperature
- erok81
- · Replies 1 ·
Complex circuits with Kirchoff's law
- serverxeon
- · Replies 1 ·
Two negatively charged balloons on strings. Find tensions?
- cvang24
- · Replies 1 ·
What Voltage Accelerates an Electron Over 0.350 m in 46.0 ns?
- Shinster007
- · Replies 20 ·
What determines scattering angle in the Compton effect?
- Opus_723
- · Replies 3 ·
Momentum in special relativity problem
- sapz
- · Replies 3 ·
Finding acceleration of block A with friction on incline
- aaronfue
- · Replies 1 ·
Matrix operations in a general physics problem
- AmTran_Bus
- · Replies 1 ·
Frequency of circuit with purely real impedance
- leroyjenkens
- · Replies 14 ·
Electric field of ring causing oscillation
- ponyhunter
- · Replies 1 ·
Finding interatomic spring stiffness in tungsten from macroscopic elongation
- luckyg14
- · Replies 8 ·
Young's modulus of titanium alloy wire from stretching data
- luckyg14
- · Replies 19 ·
Simple pendulum gravitational potential energy at 30°
- marc_2094
- · Replies 3 ·
Does torque by gravity use cos theta instead of sin theta?
- cmkc109
- · Replies 18 ·
How long does a projectile fired horizontally from 45m stay in the air?
- Blox_Nitrates
- · Replies 38 ·
Basic Special Relativity (Time Dilation)
- bmb2009
- · Replies 7 ·
Calculating v from v0, frictional coefficients, and angle
- rockchalk1312
- · Replies 3 ·
Work done by spring and friction when 1.90 kg block hits horizontal spring
- Nfinley1
- · Replies 2 ·
What Is the Speed of the Ball When Kicked Back in This Soccer Scenario?
- OUstudent
- · Replies 2 ·
Physics Lab Question - High School
- PlanetLazy
- · Replies 4 ·