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.
From Hot to Cool: A Change in Entropy
  • kristibella
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Did I do this question correctly?
  • lanvin
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5
How Does the Moon Influence Earth's Tides?
  • Farcry25
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1
Huge problem on hydraulic lifts
  • mrjoe2
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5
Finding the Minimum Distance for Static Equilibrium with a Hanging Weight
  • unreal89
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8
Time hollow cylinder spends on ramp
  • cashmoney805
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4
How Fast Does the Rim of a Rotating Disk Move?
  • 05holtel
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1
Expansion of Solids due to increases in Temperature
  • jnbfive
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Finding force of friction on mass
  • dannyboy8920
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3
Solving A Dog's Stream Crossing Challenge
  • Throwback24
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5
Pressure on a wall due to n N2 molecules (close to ans)
  • spaghed87
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5
Calculating Tension in a Rope Supporting a Mass
  • 05holtel
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1
Acceleration of a mass connected to 2 different disks
  • cashmoney805
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3
Difference in pressure question
  • grog
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4
Calculating Final Speed & Energy of 0.1 Solar Mass Falling into the Sun
  • Ayame17
  • · Replies 6 ·
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6
Calculating Mars' Orbital Period in Earth Years
  • Inertialforce
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5
Elasticity / Diving Board problem
  • joshncsu
  • · Replies 5 ·
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5
Newton's Third Law: True or False?
  • UNknown 2010
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5
Calculating the Mass Flow Rate for Point C
  • jimbo71
  • · Replies 5 ·
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5
Calculating Power Needed for Roller Coaster
  • Photographer
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1
How mass change if 30M above earth surface?
  • xlzhsteven
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5
Inertia: blocks attached to rod of negligible mass
  • cantgetno
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5
How Do You Calculate the Moment of Inertia for a Compound Disk?
  • cantgetno
  • · Replies 5 ·
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5
Rotational Kinetic Energy of an airplane propeller
  • cantgetno
  • · Replies 4 ·
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4
Some small questions grouped together
  • ritwik06
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1
Find Relative Velocity: Acceleration on Inclined Plane
  • ritwik06
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1
Force at the end of a pivoted object
  • saltine
  • · Replies 3 ·
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3
Apparent depth involving benzene on water
  • rno88
  • · Replies 5 ·
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5
Satellite X and Y Orbital Period - Answer B: 1.4x10^6s
  • Inertialforce
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2
Calculating Electromagnetic Energy from Satellite Dish
  • ilovephysics2
  • · Replies 1 ·
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1
Need Help, Please Physics Homework, Final tomorrow Please
  • cillaxe
  • · Replies 1 ·
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1
How do I calculate the uncertainity when converting minutes to hours?
  • cbrowne
  • · Replies 5 ·
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5
Calculate Tension: Find T in A & B Cords
  • Jim4592
  • · Replies 8 ·
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8
How Does the Work-Energy Theorem Apply to Calculating Force on a Sled?
  • Jim4592
  • · Replies 3 ·
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3
How to Calculate Coefficient of Kinetic Friction for Slowing Box?
  • Jim4592
  • · Replies 5 ·
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5
Calculating Power of a Light Bulb
  • Jim4592
  • · Replies 2 ·
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2
Law of universal gravitation on three objects
  • xvortx
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1
Help Solving Kinetic Energy Equation to Find Mass of Car
  • drumjunkie
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2
Calculating Force of Asteroid Slowing Down
  • ChairmanMao
  • · Replies 7 ·
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7
Projectile problem w/ unkown velocity/time
  • bmyer
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2
Projectile Motion with Given Angle and Velocity
  • roboman32
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2
W= -262.5 kg*m Sol'n: Calculate Force & Work of 5kg Sack Lifted 15m at 3.5 m/s
  • Jim4592
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2
Solving Claire's Physics Problem: Minimum Angle to Outrun an Arrow
  • gemini2904
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3
Physics Question Regarding Impluse, Momentum, and Velocity.
  • Jim4592
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4
What is the Linear Speed of a Child on a Rotating Merry-Go-Round?
  • kaylanp01
  • · Replies 17 ·
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Outrunning an Arrow? - Claire Needs Help w/ Physics Problem
  • gemini2904
  • · Replies 10 ·
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10
What does it mean for a particle to be free?
  • catstevens
  • · Replies 3 ·
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3
Work Energy Theorem of a fired arrow
  • Notyou
  • · Replies 3 ·
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3
Acceleration of a falling tower
  • TimH
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2
Constant Acceleration of a motorist
  • devyn
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1
Moments-calculate centre of mass
  • tweety1234
  • · Replies 12 ·
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12
What is the wavelength of light in water when it enters a swimming pool?
  • Soojin
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3
What is the Power Output of the Sun's Electromagnetic Waves?
  • vrobins1
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5
Rotating cone filled with water
  • largich
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2
Calculating Center of Mass of a Car: Step-by-Step Guide
  • kaylanp01
  • · Replies 6 ·
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6
How Much Does a Brass Wire Stretch Under a 5 kN Load?
  • Soojin
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1
What is the Surface Current and Magnetic Field for a Rotating Charged Disc?
  • lovinuz
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1
Length and Value of KE Question. Please Check Answer
  • cbrowne
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Deriving Rotational Energy Equation for Rigid Bodies
  • Crosshash
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Give the error formula for y=x5
  • cbrowne
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Practice Problems Confused on what equations to use
  • vballkatie22
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Determining types of interference
  • jaejoon89
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Easy operations but somehow I'm wrong
  • fallen186
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1
What Is the Density of a Sphere Submerged in Water?
  • 05holtel
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Conduction heat transfer mechanisms
  • Jennifer001
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Volume and Density of Unknown Material: Homework Statement
  • 05holtel
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3
What is the pressure at the bottom of the water layer?
  • 05holtel
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1
Why Does Deep Water Reduce Foot Pain from Rocks?
  • jimbo71
  • · Replies 6 ·
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6
Furnace Device: Answers & Solutions
  • jimbo71
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Latent heat of fusion/latent heat of vaporization
  • jimbo71
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Elastic Collision of Two Boxes: Kinetic Energy Transfer
  • teckid1991
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How Does the Otto Cycle Affect Internal Energy Change?
  • doggieslover
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Cylinders (or pulley) cord-motion
  • fluidistic
  • · Replies 15 ·
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Kinetic Energy of gas Molecules
  • Dulcis21
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A point on the rim of a 0.30-m-radius rotating
  • debo
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3
How Is the Two-Slit Interference Pattern Formed and Analyzed?
  • nokia8650
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How Far Can Professor Fich Move Before Exceeding the Rope's Tension Limit?
  • bluejay1
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Solving Schrödinger Equation: A, V(x), and a Hint
  • Messy
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RC Circuit: Time Dependency on Capacitance & Resistance
  • jaejoon89
  • · Replies 2 ·
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2
What is the escape velocity for an object
  • Inertialforce
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1
How Does Hitting a Cue Ball Above the Equator Affect Its Motion?
  • bluejay1
  • · Replies 1 ·
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Gravitational force multiple choice question
  • Inertialforce
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What is the Maximum Kinetic Energy of an Object Constrained by a Cord?
  • hansel13
  • · Replies 5 ·
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Rotational Motion: Supernova to Pulsar Transformation
  • myoplex11
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Elevator and unknown passenger mass
  • retracell
  • · Replies 6 ·
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General Rule for Spring Compression?
  • FrenchAtticus
  • · Replies 5 ·
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Velocity of a cork from a toy gun
  • hansel13
  • · Replies 6 ·
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Center of Mass of a System Problem
  • catstevens
  • · Replies 1 ·
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Thermodyanmics, thermal properties of matter
  • Jennifer001
  • · Replies 4 ·
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4
How can I expand the time delay of neutrinos as a Taylor series?
  • Epif
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How Is Ice Formed When Aluminum Cools Water?
  • jason.maran
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5
Calculating Coefficient of Friction and Kinetic Energy in Bullet-Block Collision
  • marialo
  • · Replies 12 ·
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Balls exerting gravitational force on eachother
  • Axl Rose
  • · Replies 1 ·
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What is the Kinetic and Internal Energy of a Car-Truck Collision?
  • gmagnus
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Is There an Exercise Bike That Generates Heat?
  • Unassuming
  • · Replies 7 ·
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7
Semantics question about this angular momentum problem
  • FisherDude
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How can I calculate the compression of a support column under a heavier weight?
  • kkmonte
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What is the maximum compression of the spring
  • ja2ha
  • · Replies 4 ·
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What is the Apparent Weight of an Astronaut Running in a Centrifugal Spaceship?
  • wolf party
  • · Replies 10 ·
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Calculating A-hrs: Understanding a Car Battery's Performance and Efficiency
  • nckaytee
  • · Replies 4 ·
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