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.
Bullet Range Neglecting Air Drag
  • nikefan5555
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Three masses, pulleys, dynamics, and tension (Please help)
  • jeff.reinecke
  • · Replies 7 ·
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Why do people say that the person would be weightless?
  • rakeru
  • · Replies 13 ·
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Axis of Rotation for Rigid Body: How to Identify & Conditions
  • andyrk
  • · Replies 9 ·
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Massless and Frictionless Pulley
  • andyrk
  • · Replies 13 ·
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Force on a two block and a spring system
  • Saitama
  • · Replies 58 ·
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How does the index of a medium affect the focal length of a lens?
  • physicsphreak2
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Question: Calculate Wavelength from Intensity
  • Hiyun
  • · Replies 3 ·
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Calculating change in energy of a particle
  • x86
  • · Replies 3 ·
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Min weight of elevator accelerating, constant velocity, decelerating
  • judas_priest
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Speed-time graph What is the highest speed?
  • alingy1
  • · Replies 10 ·
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Pilots, diving and apparent weight
  • NA19
  • · Replies 10 ·
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10
Momentum Question Involving Elastic Collision
  • GarrettB
  • · Replies 11 ·
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11
Constant velocity and net force
  • komender
  • · Replies 6 ·
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6
Units for Strain? | Learn About Strain & Hooke's Law
  • Baumer8993
  • · Replies 4 ·
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What is the tension in the cable and the reaction at D?
  • yaro99
  • · Replies 8 ·
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8
What is the relationship between tornadoes and dew point?
  • vmedica
  • · Replies 4 ·
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4
Thermodynamics: Finding the molar heat capacity
  • Saitama
  • · Replies 16 ·
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16
The highest possible potential in a van de Graaf generator
  • Order
  • · Replies 22 ·
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22
Is Friction Necessary for Rolling Without Slipping?
  • andyrk
  • · Replies 1 ·
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Helicopter air projection velocity problem
  • FBayer
  • · Replies 8 ·
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8
Calculating an expression for work in a magnetic field
  • QuickSkope
  • · Replies 6 ·
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6
How High Can Pumped Water Reach in a Building Fire?
  • monicaalves
  • · Replies 3 ·
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3
Hooke's law spring configurations
  • judas_priest
  • · Replies 14 ·
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14
Explaining Positive Charge Higher Potential than Negative Charge
  • tsgkl
  • · Replies 7 ·
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7
Understanding Tension Forces: How to Calculate and Measure Them
  • BadSkittles
  • · Replies 17 ·
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17
Why is (Kinetic friction)= fk≤fs (Static friction) ?
  • andyrk
  • · Replies 5 ·
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I really with these questions
  • Aditi1705
  • · Replies 1 ·
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Work: Is Moving an Object Back to Its Original Spot Worth Anything?
  • BadSkittles
  • · Replies 6 ·
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Comparing Net Forces: Hammer and Feather in a Vacuum
  • BadSkittles
  • · Replies 16 ·
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Mechanics Of Materials Stress Problem
  • Baumer8993
  • · Replies 3 ·
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3
Change in Velocity Homework: Solving the Vector Difference
  • Jimbo57
  • · Replies 8 ·
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8
Physics coefficient of friction question
  • Jasmin99
  • · Replies 8 ·
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8
What Is the Normal Stress in a Prismatic Bar Under Tension?
  • Baumer8993
  • · Replies 3 ·
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3
Why we write W/L = 50/0.5 not W/L = 100?
  • anhnha
  • · Replies 3 ·
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3
Solving Impedance Diagrams: Finding i(t) with XL = ωL
  • k31453
  • · Replies 3 ·
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3
How can power be the same on two inclined planes with different angles?
  • alingy1
  • · Replies 9 ·
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9
How is the tension of a rope calculated in a climber's FBD?
  • BadSkittles
  • · Replies 12 ·
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12
Help Solving Dynamics Problem: Skier Coasting Down Hill
  • lussi
  • · Replies 4 ·
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4
Understanding the Concept of Rolling with Slipping
  • andyrk
  • · Replies 13 ·
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13
Why Is Tension Zero at the Free End of a Rotating Rope?
  • andyrk
  • · Replies 2 ·
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Magnetic Flux of a Wire Sliding on L-Shaped Rail
  • assaftolko
  • · Replies 6 ·
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Thermodynamics: First law and work definition
  • FFRamirez
  • · Replies 1 ·
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Kinetic energy of two different masses (ratio)
  • alingy1
  • · Replies 2 ·
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Calculate the net force on square loop (Magnetism)
  • theunbeatable
  • · Replies 5 ·
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5
Horizontal force on a post in a Hammock
  • sun.there
  • · Replies 1 ·
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1
Uniform Circular Motion extended response
  • NickSpain96
  • · Replies 2 ·
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2
Fnet = ma Ff = -0.3375/0.08 = -4.219N
  • CollegeJunior
  • · Replies 5 ·
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5
Particle with horizontal velocity and vertical acceleration
  • Robertoalva
  • · Replies 7 ·
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7
High School Physics: Projectiles at Angles
  • Geminiphysics
  • · Replies 14 ·
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14
Thermocouples: Advantages and Disadvantages
  • Knightycloud
  • · Replies 2 ·
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Vertical acceleration and horizontal velocity
  • Robertoalva
  • · Replies 24 ·
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24
Conceptual question about blocks and friction
  • BadSkittles
  • · Replies 1 ·
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1
Net force on a charge - Coulomb's law
  • rms5643
  • · Replies 1 ·
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Block attached to spring - calculate how far it will move
  • jcjc16
  • · Replies 5 ·
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Simple DC motors Current, Torque, EMF and Faraday's Law
  • sleeppotato
  • · Replies 14 ·
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Energy required to heat up a 4000 cm^3 of air to 1500 Celsius
  • Panthera Leo
  • · Replies 7 ·
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Calculating the net force acting on a object from diagrams
  • hg10tr
  • · Replies 5 ·
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Acceleration due to Gravity on Mars
  • mlee16
  • · Replies 3 ·
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What is the tension in a pulley system with multiple weights?
  • JeyGamer
  • · Replies 4 ·
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Thermodynamics: Calculating the work done
  • Saitama
  • · Replies 6 ·
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6
Understanding the Motion of Electrons in a Magnetic Field
  • Saitama
  • · Replies 27 ·
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27
Calculating Heat Required to Warm Earth's Oceans by 1.0 °C
  • jwainwright09
  • · Replies 15 ·
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What is the velocity of the center of inertia after bar 1 breaks off the wall?
  • Saitama
  • · Replies 9 ·
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Understanding Electricity and Circuits
  • anhnha
  • · Replies 5 ·
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5
How do curve speed and incline angle affect the downward force on a car?
  • NA19
  • · Replies 3 ·
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How do lever arms affect the velocity of objects?
  • NA19
  • · Replies 10 ·
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Acceleration of wedges and particles
  • Woolyabyss
  • · Replies 9 ·
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9
Invisible Charge: Solving for Equal Distance in Coulomb's Law
  • somasimple
  • · Replies 3 ·
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Why the light increases when Prof. Lewin touch the end of the tube?
  • anhnha
  • · Replies 5 ·
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How many ways to sum vectors in a plane to zero
  • bkraabel
  • · Replies 13 ·
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Why Plot T² Against 1/K for a Straight Line Graph in Oscillation Studies?
  • Peter G.
  • · Replies 2 ·
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2
Magnitude of force to keep stick in equilibrium.
  • zeralda21
  • · Replies 5 ·
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5
Terminal Velocity Given Acceleration at Instantaneous Velocity
  • Greatness
  • · Replies 4 ·
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4
Why voltage in a short circuit is 0?
  • alexmath
  • · Replies 3 ·
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3
Zero Group Velocity: What Does it Mean?
  • Zarquon
  • · Replies 1 ·
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1
How? Which Trig Identityis that?
  • k31453
  • · Replies 5 ·
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5
Hookes law: Calculate the work done by compressing a spring
  • x86
  • · Replies 1 ·
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Momentum Conservation and Rebound Velocity Comparison
  • Fresko
  • · Replies 8 ·
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8
What is the tension just before and just after touching the nail?
  • andyrk
  • · Replies 14 ·
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How Do I Solve These Equilibrium Equations with T₂ and T₃?
  • Suarden
  • · Replies 20 ·
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Calculating Carbon-14 Activity for Archaeological Samples
  • tg22542
  • · Replies 2 ·
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Calculating Heat Energy Changes in a Water and Ice System
  • Ravi Ramdoolar
  • · Replies 6 ·
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Why is the Integral of Force Over dx Equal to Kinetic Energy?
  • BadSkittles
  • · Replies 1 ·
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Solving Momentum Questions: Find Speed of Toy Car After Pellet Impact
  • Fresko
  • · Replies 4 ·
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Drift current Is of PN junction under open-circuit conditions
  • anhnha
  • · Replies 1 ·
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How Do Two Masses and a Spring Behave on a Frictionless Surface?
  • SqueeSpleen
  • · Replies 11 ·
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What Are the Key Challenges in Understanding Particle Physics Homework?
  • Fresko
  • · Replies 2 ·
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Solve Uniform Motion: Trooper Interception of Cletus in 4 Secs
  • Nirupt
  • · Replies 17 ·
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Conditions for pulleys and strings
  • andyrk
  • · Replies 37 ·
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Calculating Time Difference in Pursuit Situations
  • Saitama
  • · Replies 34 ·
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Solving Momentum Questions: Inelastic Collisions
  • Fresko
  • · Replies 9 ·
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Angle when a projectile is launched at a height from the ground
  • cookiecrumbzz
  • · Replies 4 ·
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Looking for an algebraic definition of work.
  • Diax
  • · Replies 4 ·
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Penetrating power of radiation questions
  • tg22542
  • · Replies 7 ·
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Minimal angular velocity of a swinging homogenous stick ?
  • CandiedPaper
  • · Replies 2 ·
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Is it possible electrons fallen into holes and go straight to collecto
  • anhnha
  • · Replies 23 ·
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Show that the forces form a couple (algebraic)
  • Kinhew93
  • · Replies 1 ·
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Newtons cradle Conservation of Momentum
  • Acadeus
  • · Replies 1 ·
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Saving Electrical Energy with a Heat Pump: 75%
  • M9501
  • · Replies 1 ·
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