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.
Why Can't a Full-Size Thermometer Measure Thimbleful Hot Water Accurately?
  • spaghetti3451
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3
How Is a Star's Lifetime Calculated Using Mass-Luminosity Relationship?
  • ZedCar
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3
How to calculate instantaneous speed from a speed - time graph?
  • Seniour Baloc
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7
Solving Electrical Circuit Puzzle: Voltmeter & Transistor
  • rebecca12345
  • · Replies 4 ·
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4
How Close Can a Helium Nucleus Get to a Gold Nucleus?
  • jinhuit95
  • · Replies 7 ·
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7
PV Diagram help - Monatomic ideal gas change of state
  • prj
  • · Replies 3 ·
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3
How can I show the sun rotates?
  • SecretSnow
  • · Replies 3 ·
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3
Tracking a Falling Ball: Investigating Radius Over Time
  • Numeriprimi
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5
Magnetic force Particle trajectory
  • arierreF
  • · Replies 8 ·
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8
What is the velocity and time needed to solve this kinematics problem?
  • lidakeo
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4
Determining resistance of a series resistor in a simple series circuit
  • gbru316
  • · Replies 6 ·
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6
Finding Tension Between Garfield and John at the Olympics Parking Lot
  • Lolagoeslala
  • · Replies 19 ·
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19
Calculating distance using the speed of sound through two different mediums
  • Joe Schmoe
  • · Replies 15 ·
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15
Need help with physics question about relative motian.
  • bonbloc
  • · Replies 2 ·
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2
Determining Current Magnitude & Direction for Stationary Bar on Inclined Plane
  • arierreF
  • · Replies 18 ·
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18
Neutron, proton collision problem
  • ofeyrpf
  • · Replies 5 ·
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5
Time Dilation in Relativity: Solving a Simple Observer Problem
  • unscientific
  • · Replies 2 ·
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2
Why Is Kinetic Energy Zero at Escape Speed?
  • SecretSnow
  • · Replies 15 ·
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15
Satellite Orbiting: Understanding the Concept
  • SecretSnow
  • · Replies 6 ·
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6
How Does Symmetry Solve a Cubic Resistor Network?
  • vink
  • · Replies 3 ·
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3
How Does Rsinθ Relate to Extra String Length in Physics?
  • Dragster
  • · Replies 6 ·
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6
Optics, calculating image distance,.given magnification and focal length
  • faria123
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1
North Pole Entering a coil wound counterclockwise
  • COOLMAN09
  • · Replies 1 ·
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1
How Do Measurement Uncertainties Impact the Calculation of Gravity?
  • trollcast
  • · Replies 3 ·
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3
Scaling factor of a simple pendulum between length and time period.
  • mrcotton
  • · Replies 7 ·
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7
Moment of Inertia for 2D Rectangle: Does it Depend on Both Sides?
  • peripatein
  • · Replies 5 ·
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5
Capacitance Circuit Homework: Initial Conditions
  • unscientific
  • · Replies 5 ·
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5
Solve Pulleys & Mass Homework: Lift 60N Box w/ 3 Pulleys
  • Loading
  • · Replies 26 ·
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26
[Relativity] Energy and momentum question
  • radiator0505
  • · Replies 5 ·
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5
Question how to find acceleration with kinetic friction involved.
  • baird.lindsay
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3
Equilibrium - The physics of a clothesline.
  • L_0611
  • · Replies 8 ·
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8
Need help converting units, momentum of quark question
  • DunWorry
  • · Replies 6 ·
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6
Problem deriving failure of simultaneity at a distance
  • Roo2
  • · Replies 1 ·
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1
Statistical mechanics - Partition function of a system of N particles
  • Jalo
  • · Replies 5 ·
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5
Calculating Gravitational Balance Point between Earth & Moon
  • slybuster
  • · Replies 7 ·
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7
Work done by a force with a given equation
  • trogdor5
  • · Replies 5 ·
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5
Conservation of momentum - falling from hovering helicopter
  • Hilarry
  • · Replies 6 ·
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6
How many nodal and antinodal lines are there?
  • Ilan
  • · Replies 1 ·
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Statistical Physics - average energy of a system.
  • Jalo
  • · Replies 1 ·
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1
Finding the speed of a proton in a mass spectrometer
  • Mack199
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2
Why Is Tension 3mg at the Lowest Point?
  • duplaimp
  • · Replies 1 ·
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Young's Experiment and the Wave-Particle Model
  • Kennedy111
  • · Replies 1 ·
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1
Final Swing Angle and Direction After Two Pendulums Collide and Stick Together
  • Gill987
  • · Replies 19 ·
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19
Calculating Rollercoaster Energy and Designing for Conservation
  • BlueCardBird
  • · Replies 5 ·
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5
Magnitude and Direction, Canoe on River
  • ap_physics
  • · Replies 3 ·
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3
Turntable Problem: Homework Solution
  • teeheehee
  • · Replies 5 ·
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5
How Does a Vacuum Cleaner Belt Influence Rotational Motion Dynamics?
  • ehabmozart
  • · Replies 3 ·
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3
Confused about direction in angular momentum
  • DunWorry
  • · Replies 5 ·
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5
How Do You Linearize the Euler Equations for Fluid Motion?
  • ginhung
  • · Replies 3 ·
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3
Heat Loss of Liquid, Solve for Time
  • jsh562
  • · Replies 21 ·
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21
Understanding the meaning of maximal contraction values
  • assaftolko
  • · Replies 19 ·
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19
Magnitude and direction of Vectors using head to tail rule
  • bllnsr
  • · Replies 9 ·
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9
Optics (double slit experiment)
  • roam
  • · Replies 4 ·
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4
Maximal Contraction & Height Reached by 2kg Mass on Spring
  • assaftolko
  • · Replies 8 ·
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8
What Is the Acceleration of a Car Coasting Up a 10 Degree Incline?
  • romanphysics
  • · Replies 6 ·
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6
How Many Beats per Second Will the Runner Hear Due to Sound Interference?
  • Loading
  • · Replies 5 ·
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5
Bar of uniform mass hinged to the ceiling.
  • peripatein
  • · Replies 25 ·
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25
What Is the Minimum Distance Between a Slow-Launched Satellite and Its Planet?
  • slai13
  • · Replies 3 ·
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3
Need help with a kinematics problem. I'm not sure if I did it properly.
  • dguilfoyle
  • · Replies 1 ·
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Electric field of a line of charge and direction
  • Ahmed A
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Finding gravitational potential inside solid sphere
  • demonelite123
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Tangential velocity of the earth
  • RTW69
  • · Replies 3 ·
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3
Planets, Meteors, and booster rockets space
  • Loading
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4
Compton Effect, frequency question
  • Kennedy111
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Maximum Extension of a Hanging Spring
  • heartyface
  • · Replies 6 ·
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6
Bungee jumping with elastic cord and rigid rope
  • Giff
  • · Replies 1 ·
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1
Understanding Tangential Acceleration in Circular Motion
  • heartyface
  • · Replies 9 ·
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9
What is the proper time interval in relativity and how is it determined?
  • SecretSnow
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2
How Is Maximum Kinetic Energy Calculated for an Object on a Circular Path?
  • duplaimp
  • · Replies 11 ·
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11
What Determines the Frequency of a de Broglie Wave?
  • yogifromindia
  • · Replies 8 ·
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Thermodynamics - Cycle efficiency
  • Jalo
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Finding f and d in Lab Experiment
  • lionely
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6
Experiement of determining specifc latent heat of vapourisation
  • lionely
  • · Replies 10 ·
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10
Classic Hemispherical Analyzer
  • rbrayana123
  • · Replies 1 ·
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1
The work done by an electric field in accelerating a charged particle?
  • Dongorgon
  • · Replies 3 ·
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3
Can't understand why work done on a spring is given by .5fx^2
  • deliciousiron
  • · Replies 6 ·
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6
Finding acceleration on an incline plane with static friction
  • Arclite Cham
  • · Replies 1 ·
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How is my text book getting the components of a vector?
  • student34
  • · Replies 2 ·
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2
Acceleration in two dimensions. Hockey puck question
  • TimelessTime
  • · Replies 10 ·
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10
Two Masses Connected by Spring Against Wall
  • Gill987
  • · Replies 9 ·
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9
Collision with orientation, finding velocity
  • SuperHero
  • · Replies 3 ·
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3
Electricity and magnetism confusion
  • Dongorgon
  • · Replies 7 ·
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7
Uniqueness/Gauss Theorem - General Difficulty/Misconceptions?
  • rbrayana123
  • · Replies 2 ·
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Why is Method 2 More Precise than Method 1 in Statistical Analysis?
  • arierreF
  • · Replies 2 ·
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2
How Far Does the Goalie Slide on Ice After Catching a Hockey Puck?
  • Loading
  • · Replies 6 ·
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6
How Far Does a Goalie Slide After Catching a Puck?
  • Loading
  • · Replies 11 ·
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11
How Does the Law of Conservation of Energy Apply to a Particle's Motion?
  • dot123
  • · Replies 3 ·
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Dynamical friction due to gravity
  • sapz
  • · Replies 1 ·
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How Fast Does the Train Accelerate to Outpace the Car?
  • theultimate6
  • · Replies 1 ·
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Diffraction With A Single Slit And A Lens.
  • chris_avfc
  • · Replies 2 ·
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Mass of an accelerated electron?
  • Tryhard2
  • · Replies 3 ·
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3
Calculate Perihelion Distance of Mars Using Solar System Parameters
  • ZedCar
  • · Replies 2 ·
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2
Linear and angular momentum problem
  • barryj
  • · Replies 3 ·
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3
Electric circuit explanation question involving voltage changes
  • question dude
  • · Replies 9 ·
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9
Charge Between Two Conducting, Connected Shells
  • Contingency
  • · Replies 20 ·
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20
Finding the magnitude and direction of current thro Kirchhoff law
  • logearav
  • · Replies 3 ·
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3
Hydrostatic problem - Impossible integral
  • jaumzaum
  • · Replies 13 ·
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13
How Does Moving at 20sqrt(2) m/s Affect the Projectile's Trajectory Equation?
  • ShizukaSm
  • · Replies 3 ·
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3
Calculating Free Fall Motion on a Drop Ride: Solving for Velocity and Distance
  • baird.lindsay
  • · Replies 11 ·
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Residual Gas in High Vacuum Systems
  • Ryomega
  • · Replies 1 ·
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1