Introductory Physics Homework Help Forum

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Free introductory physics homework help step by step from qualified mentors. Algebra and calculus based general physics homework. High school and undergraduate level.
Spectral radiant exitance when given temperature
  • Landshark
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4
How to get max velocity for simple pendulum
  • PhizKid
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1
Projectile Motion - What angle should the quarterback throw the football?
  • ElleElle
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4
3D tension problem (static equilibrium)
  • silentskills
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1
Equivalent Resistance Simulator
  • GreenPrint
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2
Finding electric field between two charges
  • joel amos
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3
Position vector R of a particle moving x-y plane
  • chris61986
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1
Uniform Circular Motion - Finding Fc/Ft without mass
  • Elatric
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1
Finding angle through cross and dot product
  • cxiangzhi
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8
Cards hanging off the end of a table problem
  • dinospamoni
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14
Center of Gravity/ Seesaw problem?
  • laneybaney
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1
Kinetic and gravitational potential energy and velocity
  • pbonnie
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6
How much charge is enclosed by the box?
  • AxM=Fam
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2
Kinetic and gravitational potential energy
  • pbonnie
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7
Calculating energy needed to melt aluminum cans?
  • MarianaMoon
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5
What conditions are needed so that a billiard ball slides rather than rotates?
  • great_sushi
  • · Replies 7 ·
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7
Driving towards a deer; Constant
  • burton95
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1
How Do You Calculate Current from a Single Oscillating Charge?
  • bladesong
  • · Replies 10 ·
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10
Find the Foces in A and B and the tension in the wire
  • Huumah
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1
Calculating Wavelength from Interference Pattern: Narrow Slits and Laser Light
  • quicksilver123
  • · Replies 6 ·
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6
Find time to reach ball. 1D motion
  • baird.lindsay
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1
A block on the platform of an acceleratin truck
  • lep11
  • · Replies 2 ·
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2
Electrical and gravitational forces of protons
  • joel amos
  • · Replies 7 ·
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7
Projectile Motion Problem: Finding Horizontal Position at a Given Height
  • RjD12
  • · Replies 12 ·
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12
Guass Law involving conducting cylinders
  • maiad
  • · Replies 1 ·
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1
What is the Ideal Current Source and How Does it Affect Circuit Design?
  • GreenPrint
  • · Replies 15 ·
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15
Parallel plane - electric field and potential
  • Deathnote777
  • · Replies 3 ·
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3
Shortest possible period of revolution of two identical gravitating solid spheres
  • autodidude
  • · Replies 13 ·
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13
What is the validity of this electrical circuit?
  • GreenPrint
  • · Replies 8 ·
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8
Does Object Size Affect Measurement Errors?
  • dwdoyle8854
  • · Replies 1 ·
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1
Electric Potential of a triangle?
  • dolpho
  • · Replies 5 ·
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5
Timelike separation: which of these two answers do you prefer?
  • daselocution
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2
Problem regarding centre of mass and linear momentum.
  • sankalpmittal
  • · Replies 18 ·
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18
Difference in shape, LxWxH, most similar proportions, regardless of scale
  • xinlo
  • · Replies 4 ·
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4
What Is the Time Between Beats for This Displacement Function?
  • BareFootKing
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2
Can You Use a Stone to Retrieve Your Frisbee?
  • veg
  • · Replies 10 ·
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10
Cracking the Code: Solving Cylindrical Shells with Gauss's Law
  • Klymene15
  • · Replies 3 ·
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3
In-Depth Pascal's Law Explanation
  • Von Neumann
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4
Spring launcher equation for x so it hits the target
  • firezap
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2
Calculating the heat in the circuit when adding resistances
  • satycorn
  • · Replies 6 ·
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6
Power Analysis in Circuits: Understanding the Flow of Current
  • charlies1902
  • · Replies 8 ·
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8
Am I correct in saying the mass of a pendulum bob affects its damping rate
  • JamieGreggary
  • · Replies 3 ·
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3
Finding the Force of Nucleus on a Single Electron of Plutonium
  • anomalocaris
  • · Replies 7 ·
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7
Electric Field Inside a Conductor Using Gauss's Law
  • SamuelLittle
  • · Replies 2 ·
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2
Pozitron-Electron interaction(anihilation)
  • pop_ianosd
  • · Replies 1 ·
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1
Lost physics student problem with vectors
  • Wats
  • · Replies 10 ·
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10
Determine forces acting on a plank at rest
  • zeralda21
  • · Replies 5 ·
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5
Spring attached to two hanging objects
  • GoGoGadget
  • · Replies 7 ·
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7
Integral for displacement from velocity
  • burton95
  • · Replies 4 ·
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4
How Do You Calculate the Mass of a Steel I-Beam?
  • CollegeStudent
  • · Replies 3 ·
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3
Find Frequency and Amplitude from Max Velocity and Accn
  • rocapp
  • · Replies 10 ·
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10
Finding amplitude of oscillation with only k, x, v, and a
  • PhizKid
  • · Replies 5 ·
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5
Keplers laws of motion - quick question on units
  • channel1
  • · Replies 3 ·
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3
Difficult vector word problem final step
  • personguything
  • · Replies 7 ·
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7
Finding forces acting on spring/pulley system
  • uglies1992
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2
Need some help with differential equations for mechanics.
  • uber_kim
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1
Find energy required to keep a rope oscillating
  • rocapp
  • · Replies 1 ·
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1
Understanding Lightbulbs: Solving the Confusing Voltage Question in Physics
  • Jarfi
  • · Replies 3 ·
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3
What prevents molecules from being too close to each other?
  • sgstudent
  • · Replies 21 ·
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21
Calculating tangential velocity of an air parcel circulating a tornado
  • Timebomb3750
  • · Replies 3 ·
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3
What is a Phasor? Explanation & Definition
  • azolotor
  • · Replies 3 ·
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3
Explaining Voltage Distribution in a Graphite-Filled Square
  • GreenPrint
  • · Replies 28 ·
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28
Person inside an isolated conductor
  • megaspazz
  • · Replies 2 ·
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2
Electric Field on Two Connected Spheres
  • dfetnum
  • · Replies 9 ·
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9
Finding r using point charges and work done by an electric force
  • Rae_4
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2
The meaning of the delta dirac function
  • anban
  • · Replies 3 ·
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3
F = MA 2009 # 14 (Momentum Quick Conceptual Question)
  • SignaturePF
  • · Replies 7 ·
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7
How to Analyze Ball Collision with a Moving Wall When V << v?
  • PhizKid
  • · Replies 24 ·
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24
F=MA 2009 #23 (Power of a Spring)
  • SignaturePF
  • · Replies 8 ·
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8
Proton enters magnetic field in spiral trajectory
  • songoku
  • · Replies 3 ·
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3
Find the angle between the two vectors
  • skysunsand
  • · Replies 13 ·
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13
Equilibrium question on review assignment, quick (I have a test tomorrow).
  • StaticWaffles
  • · Replies 6 ·
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6
AC Circuit: Finding I(t) general question
  • charlies1902
  • · Replies 3 ·
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3
What is the total force exerted by block 2 on block 3 ?
  • aruji73
  • · Replies 5 ·
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5
How Does Doubling the Mass Affect the Frequency of a Spring System?
  • SignaturePF
  • · Replies 11 ·
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11
How Does Angular Momentum Vary with Orbital Distance in Physics?
  • SignaturePF
  • · Replies 3 ·
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3
Work done to move a point charge
  • dfetnum
  • · Replies 7 ·
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7
2009 F=MA Exam #6 (Conceptual Velocity Question)
  • SignaturePF
  • · Replies 3 ·
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3
F=MA 2009 Exam # 18 (Pendulum, a small peg, and mass m)
  • SignaturePF
  • · Replies 6 ·
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6
Moment of inertia | Integral form
  • heycoa
  • · Replies 6 ·
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6
2009 F=MA # 24 (A block tipping down an incline)
  • SignaturePF
  • · Replies 12 ·
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12
Understanding formula F=GmM/r^2 confusion help
  • aruji73
  • · Replies 2 ·
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2
Help figuring out units in a power fit.
  • charlies1902
  • · Replies 4 ·
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4
What is the force of attraction between mars and the satellite?
  • aruji73
  • · Replies 4 ·
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4
Timelike separated events cannot occur at the same time
  • daselocution
  • · Replies 7 ·
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7
Person pushes down the length of the handle of a 12.1kg
  • racecar12
  • · Replies 7 ·
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7
Earnshaw's Theorem and electrostatics
  • arishorts
  • · Replies 2 ·
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2
What is the Charge of a Moving Particle in an Electric Field?
  • Rae_4
  • · Replies 4 ·
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4
Net Force Exerted by Two Charges on a Third Charge (Coulomb's Law)
  • PHYSteve
  • · Replies 2 ·
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2
Physics of Car Driving on Banked Curve: Forces at Play
  • Melac12
  • · Replies 1 ·
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1
Calculating net force from a diagram
  • pbonnie
  • · Replies 13 ·
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13
A pendulum inside an oscillation railroad car.
  • anban
  • · Replies 1 ·
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1
Projectile Motion problem Phyisics 1
  • cbchapm2
  • · Replies 25 ·
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25
Calculating Maximum Force Acting on 28kg Mass: F=ma
  • kopinator
  • · Replies 3 ·
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3
Finding Max Force Acting on a Moving Body Mass: A Challenge
  • kopinator
  • · Replies 1 ·
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1
Having trouble finding the potential between two positive point charges.
  • nontradstuden
  • · Replies 3 ·
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3
A question regarding particle diffraction.
  • BruceSpringste
  • · Replies 1 ·
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1
Special Relativity with Three reference frames
  • scienceLilly75
  • · Replies 9 ·
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9
Parallel Conducting plates problem
  • ajmaeen
  • · Replies 1 ·
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1
Calculating the Length of an Incline Plane: A Kinematic Approach
  • baird.lindsay
  • · Replies 1 ·
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1