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.
Coefficient of kinetic friction of a block sliding across the ceiling
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Understanding the Proper Uncertainty Formula to Use
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982
A water-bottle demonstration of atmospheric pressure
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Moment of inertia of a cuboid parallel to one of its faces (repost with diagram)
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25
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Average velocity for two different types of motion along same path
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22
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Heater power keeping a room constantly warm from low temperatures outside
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9
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813
Power delivered to wheels of car with constant air resistance
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3
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Angular frequency of two hanging bobs of different masses
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Two concentric conducting spherical shells and resistor in between
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Linearizing a circuit with a nonlinear element
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1
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774
Work done by friction on a hockey puck
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4
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Work done on crate moving on incline
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28
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What does a Zener diode do in a circuit with non-ideal voltage source?
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989
Half life of multi chain decays
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647
Find thermal capacity of a Van der Waals gas
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Why Is My Bungee Cord Tension Calculation Incorrect?
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15
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An optics question concerning pictures taken by camera
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27
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'Police Car Catching Up' problem in kinematics
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16
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Solving for φ on an oscillation problem
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17
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1K
Two dimensional motion problem (kicking a soccer ball into the goal)
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3
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878
Potential and Electric Field near a Charged CD Disk
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2
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2K
(Help) Surface charge density (σ) for particle to hit plate...
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4
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Electric field strength and direction problem (need help)
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6
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1K
Moments question help requested, unsure where I went wrong
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4
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625
Relativity: Cosmic ray proton traveling to Earth
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12
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998
Minimizing the Energy of Two Conductors Very Far Apart
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23
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2K
How Do Signs Affect Energy Calculation?
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Elastic collision with a massless box
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5
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627
Electric field on the axis of a ring-shaped charged conductor
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1
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978
Moment of inertia of a rectangular prism parallel to one face
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11
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1K
Find the transit time of the train
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23
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British physics olympiad problem: A ball bearing bouncing off a steel cylinder
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2
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806
Question about the thermodynamic temperature scale
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2
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767
Why can we model spherical capacitor with two dielectrics as two capacitors in series?
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4
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2K
Conservation of Energy with springs
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13
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Force on a charge from a nearby charged rod
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2
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958
Is my textbook wrong about absolute uncertainties?
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2
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1K
Kinematics, curvilinear motion (a couple of questions)
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2
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30
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2K
Why Is the Electric Potential the Same for Inner and Outer Semi-Circles?
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7
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When Do Sand Particles Slip Off a Vibrating Plate?
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13
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Help with this integral on page 34 of Analytical Mechanics by John Bohn
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4
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677
Help please with my understanding the solution of this mass on a vertical spring
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10
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983
Motion of a Parachuter (Terminal Velocity, Time of Flight, Distance)
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10
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1K
What is the y-component of the force by the floor on her during the collision?
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15
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1K
Max distance a truck can travel without box falling off
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10
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Difficult problem in Rotational Mechanics JEE 2017 Comprehension paper
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1
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1K
Distance-time graph of a ball throw vertically up from a fixed point
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5
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2K
Find tension in string between two blocks on horizontal surface
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4
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Solved: Help with a block sliding down an Inclined platform
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17
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803
Why Does a Free-Falling Object Not Have Zero Final Velocity Upon Impact?
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22
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3K
Find the coefficient of friction and acceleration with masses given
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7
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880
Two different dielectrics between parallel-plate capacitor
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2K
Is This Electric Field Representation Accurate?
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28
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How to answer this question, 21-cm emission line
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956
Uncertainty Error and Significant Figures in this Force Tables Lab
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Constrained motion of a ring along a horizontal rod
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A 3.5 nC charge is at the origin and a -10 nC charge is at x = 2 cm
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Charge on inner/outer surfaces of two large parallel conducting plates
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Rating speeds from least to greatest from a position time graph
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Gravitation Potential Energy -- Questions about calculating the sign of GPE
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878
Calculating Time Dilation for Space Travelers
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4
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888
How many independent components does a tensor have?
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Derivation Of Torque On Current Loop Due To Uniform Magnetic Field
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Understanding Inductance and Induced EMF in Simple Circuits
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Direction of the magnetic needle
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How Does Voltage Affect LED Color Through Band Gap Adjustments?
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Potential Mistake in Free-Body Diagram
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2K
Errors in Experiment with Low and High Conductivity Materials
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State Space Representation of a 1D Point Mass Floating in Space and Actuated by Two Lateral Thrusters
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A confused Compass Needle between two solenoids
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2K
Magnetic field pointing into a normal magnetized compass needle
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Deduction about Magnetic Poles surrounding a Conductor
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3K
Tension Question with One Mass and Two Pulleys
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7
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2K
Why Do I Get Negative Values Solving the SHM Spring Problem?
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792
Hamiltonian Function thru new Variables Q,P -- Show that Q is cyclic
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782
Stretching of a rotating spring
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8
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2K
A Question about the Double Atwood Machine
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16
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3K
What Causes the Loss of Mechanical Energy in a Frictionless Spinning Cylinder?
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6
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E&M: Forces resulting from Charges at the Corners of a Cube
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2K
Compare the ratio of two times t1/t2 in this vertical jump
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1K
Centripetal Acceleration while Swinging a Stone on a String
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9
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2K
Homework help: Dropping a sand bag from a Hot Air Balloon
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3
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1K
Physics Torque Equilbrium Question
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How Does Longitudinal Stress Affect a Body's Internal Tension?
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How Do SI Units Affect Calculations in Fluid Statics?
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What Factors Cause a Water Container to Tip Over When Accelerated?
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Feynman's Lectures exercise about Newton's laws
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Air pressure changes in a vessel as the vessel volume increases
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Quantum Mechanics I, finding impuls wavefunction.
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6
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950
Syntax Error? x and y components of E field in unit vector form
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Direction of current as bar magnet moves uniformly through copper ring
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What Does exp Mean in Mathematical Expressions?
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Time interval between intermediate passing of two rods....
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Intensity and electric field amplitude
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Electron bound to proton by gravity
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Conceptual misunderstanding in applying formula for work done in adiabatic compression
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What is ##Tds## in this equation : ##dU = Tds - PdV##
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Measuring the Velocity of Sound in this Lab Exercise
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Confused about a conservation of energy problem
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4
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Can an Electron Be Observed in a Light Microscope?
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