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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How Many Photons Does a CO2 Laser Emit to Vaporize Flesh in Surgery?
- shaiqbashir
- · Replies 2 ·
Angle between colors - dispersion
- BDR
- · Replies 3 ·
Chemical Equilibrium: K_c and Moles
- recon
- · Replies 3 ·
Proving the Second Partials Test
- mattmns
- · Replies 2 ·
Simplifying (▲^2 - x▲)(x^3) Using Finite Differences
- irony of truth
- · Replies 2 ·
Why Is My Calculation Using the Gas Law Equation Incorrect?
- pippermay
- · Replies 2 ·
Kinematics od deccelerating train
- frozen7
- · Replies 15 ·
Launching an airoplane using a mouse trap
- gangsta_jme4
- · Replies 18 ·
Finding the tangential speed Help
- Ester
- · Replies 2 ·
Misconceptions about length contraction
- delton
- · Replies 6 ·
EM Induction: Increasing Turns, Increasing EMF, Current?
- phyphysics
- · Replies 2 ·
Does Every Closed Form on U Being Exact Imply the Same for f(U)?
- rocket
- · Replies 2 ·
Marriage problem with r-regular bipartite graph and transversals
- Pietjuh
- · Replies 4 ·
Solving E-Fields using Gauss' Law: Choosing Surfaces
- misogynisticfeminist
- · Replies 2 ·
Convergence of Improper Integral
- pbialos
- · Replies 5 ·
Electron Negativity: Why Electrons Have a Negative Charge
- juskovin
- · Replies 2 ·
Integrating a Tricky Devil: $\int \frac{\cos^5(\theta)}{\sin^4(\theta)} d\theta$
- gazzo
- · Replies 2 ·
How is sigma subscript (y) related to spin and magnetic moment?
- danai_pa
- · Replies 2 ·
Finding the wavelength (new to physics)
- StotleD
- · Replies 2 ·
Uniform Hoop Hit By a Small Sticky Ball of Putty
- SpeeDFX
- · Replies 7 ·
Remembering which formula to use in physics derivations
- Aladin
- · Replies 5 ·
How Do You Derive the Volume of an n-Dimensional Sphere?
- rocket
- · Replies 2 ·
Are F3 and Z paradoxical groups?
- JSG31883
- · Replies 3 ·
Trying to understand microfluiditics [sp, microfluidics]
- sr6622
- · Replies 5 ·
Static Friction of a washing machine
- brayrbob
- · Replies 8 ·
Proving n-dimensional sphere volume scales as r^n
- rocket
- · Replies 2 ·
Diffraction by single slit - effect of increasing the slit width
- physicsilliterate
- · Replies 2 ·
Derivation of solid sphere moment of inertia
- jordanl122
- · Replies 10 ·
Making a physics toy for a graduation project
- rouvin
- · Replies 2 ·
What is the Vector Identity for \vec A and \hat n?
- Reshma
- · Replies 2 ·
Why does wavelength appear unchanged in a stroboscope?
- primarygun
- · Replies 4 ·
Carnot Cycle and Adiabatic process
- Bob19
- · Replies 15 ·
Sum of reciprocals of numbers with only prime factors 2 and 3
- iNCREDiBLE
- · Replies 16 ·
Sign conventions for the lens equation 1/f = 1/do + 1/di
- michaelw
- · Replies 7 ·
What does the y-intercept represent in Kepler's 3rd law relationship?
- patcho
- · Replies 2 ·
Polarization I = Io*cos^2 theta
- DAP1MP13
- · Replies 4 ·
Solving the Kinetic Friction Problem - Bob's Dilemma
- brayrbob
- · Replies 4 ·
Tension in two wires holding a 2.0kg sphere at 60° and 30°
- psingh
- · Replies 9 ·
Car driving on circular track with constant forward force
- aliciaw0
- · Replies 9 ·
Finding Focal Lengths of Microscope Lenses
- shorty_47_2000
- · Replies 3 ·
Equilateral triangle electrostatics problem
- in10sivkid
- · Replies 10 ·
2 Balls on inclined plane problem
- Bama
- · Replies 5 ·
How far can a 70 kg painter walk on a 6 m plank before it tips?
- rlmurra2
- · Replies 14 ·
Sequences of positive numbers and limits
- iNCREDiBLE
- · Replies 2 ·
Calculating Total Translational Kinetic Energy in an E.Coli Bacterium
- Phoenix314
- · Replies 6 ·
How Thick Is the Glass Plate Based on Visibility Circle?
- ERB225
- · Replies 2 ·
How Can a 3D PDE Be Simplified to a 1D Equation in Theta?
- Ido
- · Replies 2 ·
Expressing velocity as a function of the distance (not time elapsed)
- Beez
- · Replies 3 ·
What does the product IA represent in the torque formula for an electric motor?
- pmfinnegan2
- · Replies 2 ·
Why is (a,b) + (c,d) = (a+c, b+d) not well-defined in the rationals?
- iNCREDiBLE
- · Replies 6 ·
Dynamics coefficient of friction
- polly06
- · Replies 5 ·
Magnetic Field and Induced Currents in Rails Problem
- phyphysics
- · Replies 10 ·
Calculating Orbits of Groups: SO(3)
- rdc30ynow
- · Replies 2 ·
When is population growing fastest and how to show it increasing or decreasing?
- gordda
- · Replies 6 ·
Hwk Problem about Convex Mirrors
- shawonna23
- · Replies 2 ·
Why Is the Number e Considered Irrational?
- VietDao29
- · Replies 5 ·
Faraday's law of electomagnetic induction
- mayo2kett
- · Replies 5 ·
Physics B vs. Physics C, Calculus AB vs. Calculus BC
- mewhoexactlywhat
- · Replies 10 ·
Is the Equation for Refractive Index Accurate?
- primarygun
- · Replies 13 ·
Related rates of change (2 problems)
- Pseudo Statistic
- · Replies 8 ·
Deriving the Fresnel Equations for E Field in Plane of Incidence
- Cummings
- · Replies 2 ·
How Do You Calculate the Peak EMF of a Rotating Coil in a Magnetic Field?
- mayo2kett
- · Replies 3 ·
Give the range of possible solutons of trig equation
- plucker_08
- · Replies 3 ·
Arc length and chord distance for a great circle
- irony of truth
- · Replies 5 ·
Finding mag E of 2 thin-walled concentric cylindrical shells
- mr_coffee
- · Replies 10 ·
Instantaneous Energy Density: 501 N/C
- hotstuff
- · Replies 2 ·
Time velocity accelertion @ point x two electrons
- rebeka
- · Replies 4 ·
Finding speed using conservation of mechanical energy
- Ester
- · Replies 2 ·
What's the Difference Between 'Out of Paper' and 'Upwards' in Magnetic Forces?
- phyphysics
- · Replies 10 ·
Proof of Coulomb's Law using Gauss' Law
- jdstokes
- · Replies 2 ·
Two capacitors in series at 1000V: total capacitance, charge and voltage
- in10sivkid
- · Replies 4 ·
Time as a function of distance? electrostatic force
- rebeka
- · Replies 16 ·
Compute the electric field in air
- in10sivkid
- · Replies 4 ·
Uncertainty Relations and Functions of Operators
- Dathascome
- · Replies 5 ·
Finding the charge of a drum, i got the steps i think
- mr_coffee
- · Replies 8 ·
Find Midpoint of Shaped Area: 300, 5000, 1500, 5142
- iNCREDiBLE
- · Replies 2 ·
Satelite how far from center of earth?
- ChinToka
- · Replies 2 ·
Solving dy/dx + (1/2)y = (1/2)e^(t/3)
- asdf1
- · Replies 9 ·
Calculating Wavelength without distance
- StotleD
- · Replies 3 ·
What Is the Minimum Tension Needed to Move a Toaster on a Countertop?
- rlmurra2
- · Replies 14 ·
Questions about Fleming's left hand rule
- phyphysics
- · Replies 2 ·
Requiring free body diagrams in homework help requests
- amt
- · Replies 3 ·
What is the gravitational force on the satellite?
- badman
- · Replies 8 ·
"Find the Current in a 25mH Inductor Circuit
- hotstuff
- · Replies 2 ·
Why Choose Phenolphthalein Over Bromothymol Blue for Equivalence Point at pH 7?
- Chocolaty
- · Replies 4 ·
Asking about direction of magnetic force
- phyphysics
- · Replies 4 ·
Ummm, what do these equations do
- physics noob
- · Replies 3 ·
Plotting Direction Fields for Differential Equations: A Mathematica Tutorial
- DivGradCurl
- · Replies 5 ·
How Much Weight Must a Balloon Drop to Rise Quickly?
- aud11888
- · Replies 8 ·
What Is the Kinetic Energy of the Mars Climate Orbiter Relative to Earth?
- badman
- · Replies 5 ·
Conservation of energy of sliding block
- orionics
- · Replies 4 ·
Clairaut's equation: singular solutions and parametric forms
- Benny
- · Replies 2 ·
Solving Low T, High B Behavior of (deltaE)^2 = C*[sinh(a*B)]^-2
- Allday
- · Replies 6 ·
Finding thumb force on a lunch tray held in one hand
- drewfus
- · Replies 3 ·
Why does (2x³+y³)dx−3xy²dy=0 solve in those steps?
- asdf1
- · Replies 6 ·
Is Calculus a Smooth Transition After Mastering Trig and Algebra 2?
- Brady
- · Replies 3 ·
P - What books are recommended for the U.S. Physics Olympiad?
- sr6622
- · Replies 2 ·
Net charge on conducting sphere from electric field at 15 cm
- mr_coffee
- · Replies 2 ·
Magnitude of the net force that acts on the charge
- Confused5283
- · Replies 2 ·
What is the frequency for a period of 60 microseconds?
- taho2720
- · Replies 2 ·