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.
How to read spacetime (Minkowski) diagram for proper length
  • techsingularity2042
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Velocity required to escape the solar system
  • theblazierbroom
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How do you calculate the margin of error in Physics?
  • daiyleena
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Simple harmonic motion question
  • gage123
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Gauss' Law for Non-Uniform electric fields
  • Dev
  • · Replies 17 ·
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17
If closed integral of E.dS is zero over a surface, then...?
  • Dev
  • · Replies 14 ·
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14
Gauss' law: Cause and effect relationship on the flux
  • Zayan
  • · Replies 22 ·
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22
No Electric Charges if No Electric Field in Region
  • putongren
  • · Replies 22 ·
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Least Square Method to fit a line to a set of datapoints
  • MatinSAR
  • · Replies 11 ·
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How to Calculate Center of Pressure (hf) for a Tank?
  • knoxox_
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Maximum electric field from a blob
  • Rob2024
  • · Replies 7 ·
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7
Maximum tension in thread connecting loads
  • Bling Fizikst
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What frequency will the bat hear?
  • Lotto
  • · Replies 15 ·
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15
Work done by gravity on a hanging chain?
  • Manish_529
  • · Replies 22 ·
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22
Tension in a supporting thread after a second supporting thread is cut
  • Bling Fizikst
  • · Replies 16 ·
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16
Entropy Change Confusion
  • laser1
  • · Replies 7 ·
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7
Hot air balloon question with bouyancy
  • Fadel_K
  • · Replies 5 ·
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5
Pulley Problem on an Inclined Surface Using Energy Methods
  • Tygra
  • · Replies 16 ·
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16
What is the tension in a charged ring?
  • etotheipi
  • · Replies 103 ·
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Pseudo Forces on a Mass in a Groove on a Rotating Disc
  • Manish_529
  • · Replies 5 ·
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Vertical Wall approaching Man - Impulse and Momentum Conservation
  • Null_Void
  • · Replies 10 ·
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10
How to calculate the moment of inertia of a rectangular cuboid?
  • Lotto
  • · Replies 5 ·
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5
Potential energy of an electrostatic system in equilibrium
  • Rob2024
  • · Replies 14 ·
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14
Gauss' Law: Conductor, Insulator, Electric Field
  • JoeyGoh
  • · Replies 7 ·
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7
Ambiguous question on momentum and how it works...
  • jeff einstein
  • · Replies 13 ·
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13
Find the work done by a spring using potential energy considerations
  • good jelly
  • · Replies 4 ·
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4
Relationship between pressure and temperature for liquids
  • sss1
  • · Replies 17 ·
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17
Archived Displacement and Momentum, particle in cathode ray tube with variables
  • physics1311
  • · Replies 3 ·
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3
IBDP Extended Essay Ideas -- Help please
  • mmmmmmmm
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2
Calculating Oscillation Period and Spring Energy in a Three-Mass System
  • lenna_kay
  • · Replies 4 ·
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4
Electric Field of a Toroid carrying a changing current I = kt on axis
  • PhDeezNutz
  • · Replies 2 ·
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Pulley system problem: 6 Pulleys and 1 Mass
  • david3305
  • · Replies 5 ·
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Signs in torque - different analyses using different sign notations?
  • mancity
  • · Replies 11 ·
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11
Why is the slope steeper in the given diagram?
  • NTesla
  • · Replies 8 ·
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Are the 2nd and 3rd problems in this video correctly solved? (charged dipole and organ pipe problems)
  • WMDhamnekar
  • · Replies 3 ·
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Mirror placed horizontally between two half convex lenses
  • Null_Void
  • · Replies 11 ·
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Billiard Ball, Conservation of Angular Momentum, Force below CM point
  • mancity
  • · Replies 6 ·
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Two vertical bars are connected at the bottom via resistance......
  • PhDeezNutz
  • · Replies 7 ·
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What average power does the boy need to produce?
  • chwala
  • · Replies 12 ·
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Projectile motion of two balls off a cliff
  • tellmesomething
  • · Replies 4 ·
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4
Focussing a collimated beam using a diffraction grating
  • kekpillangok
  • · Replies 1 ·
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Vertical spring & maximum length
  • stunner5000pt
  • · Replies 6 ·
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Lens Maker's Formula - Confusion in the derivation
  • Null_Void
  • · Replies 15 ·
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Energy of particle in simple harmonic motion
  • Brian_D
  • · Replies 13 ·
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13
An ornament for a courtyard at a World's Fair is to be made up of four large metal spheres
  • netnomad
  • · Replies 7 ·
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Springs and Pulleys - Force analysis
  • Null_Void
  • · Replies 18 ·
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Confusion Calculating Young's Modulus
  • AndrewsRT_16
  • · Replies 5 ·
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Looking at the color vs line spectrum
  • nally
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How can I calculate the uncertainty of the mean with Gaussian error propagation?
  • ida10
  • · Replies 15 ·
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How to show 400 neutrinos are present?
  • hraghav
  • · Replies 2 ·
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Change in apparent magnitude of a star after exploding
  • MatinSAR
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How do I correctly analyze the mass balance of a tractor seat?
  • Sunwoo Bae
  • · Replies 3 ·
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Just looking for confirmation for a torque calculation
  • pete94857
  • · Replies 60 ·
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I solved few questions on kinematics -- Is my working correct?
  • Aichuk
  • · Replies 10 ·
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Tension Question for Ship Container and Wind Gust
  • physicsengineering72
  • · Replies 12 ·
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Pressure and temperature phase diagrams
  • laser1
  • · Replies 6 ·
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Solving for Work Done When Accelerating a Mass
  • Jay529
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Question about springs and rotational/translational energy
  • neel400
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Question about Rutherford experiment: Which of these could not be concluded?
  • songoku
  • · Replies 12 ·
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Equilibrium problem: Multiple forces acting on this hinged, supported beam
  • Racoon5
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Freefall chord through the Earth -- calculus proof
  • achap01
  • · Replies 41 ·
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Find the coefficient of stiffness of this spring (with non-negligible mass)
  • Eshka
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Friction of a sliding mass on a slope
  • raspberrypienjoyer
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Is it possible to measure SQRT(2) kg with a scale?
  • littlemathquark
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Trying to understand the relationships between Forces, Mass and Inertia
  • ida10
  • · Replies 10 ·
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What would the voltmeters measure?
  • JACKR
  • · Replies 7 ·
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Siren frequency heard by observer when an ambulance passes
  • songoku
  • · Replies 26 ·
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How to solve this kind of problem? (Mechanics Theory)
  • nightsailor833
  • · Replies 16 ·
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Energy in simple harmonic motion--car problem
  • Brian_D
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Why am I calculating the unknown mass of ice incorrectly?
  • gabe99
  • · Replies 22 ·
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Question about absorption line spectra
  • songoku
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What does it mean that when light is reflected the "wavelengths of each contributing hue are subtracted"?
  • zenterix
  • · Replies 16 ·
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Newton's 3rd Law of Motion: Is the Punching Bag punching back?
  • paulb203
  • · Replies 4 ·
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Oscillatory motion problem: Bicycle wheel rotation oscillation
  • Brian_D
  • · Replies 17 ·
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Pressure versus stress in uniformly charged sphere
  • Rob2024
  • · Replies 11 ·
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11
Doubts on Diodes -- Why is voltage shifted by 0.7V?
  • Bling Fizikst
  • · Replies 7 ·
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Angular Momentum Conservation | Velocity at perigee
  • I_Try_Math
  • · Replies 8 ·
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Circuit with time varying current
  • MatinSAR
  • · Replies 10 ·
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Determining the Change in Bulb Brightness by Changing Circuit
  • NCanine_1932
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What does the middle of a chain on a pulley mean?
  • misu
  • · Replies 9 ·
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Constant acceleration problem: Dog chasing a surprised cat
  • abdol83
  • · Replies 13 ·
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Two bars connected by a spring on a floor with friction
  • Null_Void
  • · Replies 37 ·
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The derivative of the dot product "distributes" over each vector
  • brotherbobby
  • · Replies 5 ·
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Calculating the sum of displacement vectors
  • student120
  • · Replies 5 ·
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A problem about the laws of conservation: Bullet colliding with a wood block
  • Platon7
  • · Replies 28 ·
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Force on a point charge near a uniformly charged rod
  • athenad07
  • · Replies 3 ·
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Two rods with fixed angle, find the velocity of the crossing point
  • mancity
  • · Replies 1 ·
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Stumped on mathematical proof
  • laser1
  • · Replies 13 ·
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A 50 cubic foot tank contains saturated 134a at 100F and a quality of 50%
  • joejoe121
  • · Replies 11 ·
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How can "work" done by a force be negative?
  • Manish_529
  • · Replies 19 ·
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Torque that a grounded infinite sheet exerts on a dipole
  • PhDeezNutz
  • · Replies 11 ·
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11
Two tanks are connected by a valve and line
  • joejoe121
  • · Replies 4 ·
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Spring launcher firing steel balls
  • carmenmaki
  • · Replies 2 ·
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Circular motion question: Mass on a rod rotating in a vertical circle
  • yusungmagic
  • · Replies 4 ·
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Calculating Motor Force & Torque
  • gawlicbread
  • · Replies 9 ·
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Bead on a rod which is being pulled by an ideal string with velocity v
  • Null_Void
  • · Replies 27 ·
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Appliance plug connected wrongly: live neutral earth
  • shirozack
  • · Replies 13 ·
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Finding the direction of forces
  • grade11studentgoaat
  • · Replies 5 ·
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Finding parallel or in-series resistors
  • Ineedhelpwithphysics
  • · Replies 3 ·
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Help needed on mass-energy equivalence
  • Abivarman
  • · Replies 7 ·
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