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.
Is the Force Diagram for a Trolley with Zero Acceleration Accurate?
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How do you identify the systems in which Newton's Third Law is obeyed?
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Uncertainty, volume, and measurement
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In hot pursuit, Agent Logan of the FBI
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Dipole placed in a uniform electric field
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Time measured by two clocks (involves time dilation)
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Is Negative Acceleration Always Indicative of Slowing Down?
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Intro Physics homework help - distance and velocity
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Conservation of energy for a series of elastic collisions
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Special Relativity and lightning
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Subtracting two vectors -- I'm not getting the right answer
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Confusion in choosing an origin point for angular momentum
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Transition between excited states
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Calculate the individual voltage, current and power in series and para
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Can Derivative Methods Determine the Correct Angle in Physics Problems?
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EMF due to Lorentz electric and magnetic forces
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Exponential potential energy state diagram
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What's the source of increase in rotational energy of carousel?
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Static structure - find a fourth relation
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A transverse wave traveling through a medium versus a particle of the medium
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Calculating Rocket Velocity to Sun
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Need help with the interpretation of this v(t) graph
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Equivalent system (force+couple moment) of a loaded beam
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Special Relativity Time Dilation/Length Contraction Problem
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Uncertainty in the intersection of two lines with error bars
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Charge Density on a Conductive Slab
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Magnetic energy density, and pressure due to magnetic force
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Energy loss of damped oscillator
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Conserving Momentum in Emptying a Freight Car
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A slanted cylinder full of liquid about to fall
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Adding vectors in this 3-D problem
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Finding the velocity of a car in a different frame of reference
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Newton's First law of motion -- Boy jumping vertically on a moving train
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How Do You Calculate the Radius of a Wire Using Electrical Resistance Formulas?
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What is the net force's direction of an object at its highest point?
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Some help in understanding energy conservation
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How to solve this balancing exercise? (towing a boat with two ropes)
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Why is the tension in a falling chain not equal to ρgy?
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Two basic diode and capacitor circuits
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Electric field in a rotating rod in a magnetic field
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Electric field at a point within a charged circular ring
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How can one derive an expression for \( w^2 / k \) using \( b, p, l \) only?
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Amplitude of oscillation of a mass which is the pivot of a pendulum
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Expanding explosion from an Asteroid
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Oscillations of a disc with a smaller disc removed (Feynman ex. 17.23)
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Calculate recoil velocity using conservation of momentum
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Does $\frac{\partial^2 L}{\partial q\partial \dot q}=0$?
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Finding the Magnitude and Angle of a Problem: Two Solutions
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How to interpret the center of aero forces on a sports car?
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Understanding Acceleration and Center of Mass in Shock Absorption
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Correlating albedo with temperature?
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Calculating Forces on a Moved Body
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Deriving the Differential Position Vector in Cylindrical Coordinates
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Two Pulleys, two weights and a string
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Where am I going wrong with this vector addition?
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Stopping a Bullet: Calculate umin and xf
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Find the value of ##\theta## when the Vx and Vy components are the same
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What is the final angular displacement of a disk hit by two masses?
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Comparing energy lost by the battery & energy gained by the capacitor.
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How Do Engineers Design AntiNoise to Effectively Reduce Ambient Noise?
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Special relativity - Trivial exercise with spacetime interval
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Two Pulleys, Two Strings and Two Blocks
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Number of moles necessary to get piston back to initial position
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Propagation Wave Expressions and Wave Velocity
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Induced current in a wire loop embedded in a changing B-field
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Lenz's Law and Faraday's Law clarification
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Tangential velocity of rotating rod
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How to find coordinates of a system (I am taking cylinder now)?
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Tension in rope wrapped around a rod
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Mass m sliding without friction inside a rotating tube
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Capacitors in parallel or series
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Finding the increase in entropy of the universe in gas expansion
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What is the Young-Laplace equation and its relationship to surface tension?
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Block on a Spring, Nonconstant Net Force
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Current and resistance in the power loss of a transformer
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Centripetal Motion problem -- A bead sliding around a horizontal loop
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Explaining the Equation: ½ mu2 = ½ mv2 + ½ ms2
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How Can We Solve the Connected Bodies Problem with a Resultant Force of 39N?
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Simple conceptual reference frame question
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Entropy Change & Heat Transferred to a Gas
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Elastic and inelastic collisions
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2 Dimensional Motion: Net force at an angle
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Is the RMS Mean Free Path Equal to the Mean Free Path?
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Why position times mass is equal to 0 here (vanishes)?
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What is the best shape for a soccer goal post?
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A slightly complex pully problem missing the final step
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Dog Grooming Services""Dog Grooming: Your Pup's Pampering & Happiness
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Understanding Direction of Unit Vectors r roof & phi roof
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Vectors along different coordinate axes
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Virtual displacement for a block sliding down a wedge
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To find total work done from multiple reversible processes
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Graph of waveform across diode shown by CRO
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Force required to hold a fire hose
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Relationship between magnitude of current and magnetic field
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How to find centroid of a hemisphere using Pappus's centroid theorem?
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Help with a modified Kepler potential
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Kinematics: two runners with different and non-constant accelerations
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Work & Energy (Question on Classical Mechanics/Slope based Problems)
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Calculating Velocity when Stuntman Jumps from 1.25m Height
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Help Needed: Solving y = A sin({2*10^6 ({\pi / 3 -\pi t }) + \phi })
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