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.
Measuring the length of a moving Beam in two different directions
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Time dilation for a simple problem — Light propagating inside a moving bus
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I to start with this Rotations problem
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Speed and apparent weight of person in reverse bungee jumping
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Tension of string acting on stone moving in horizontal circular motion
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Kinematics problem -- Calculating where a dropped stone will hit a car
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Why Does Momenergy Have a Magnitude Equal to Mass?
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Finding the period of pulley system
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How to Visualize a 4 vector (e.g. a velocity)?
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Quality of an oscillating electron
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River Boat Problem: Minimizing Travel Time
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Question about the inertia of logs in a pickup truck that stops suddenly
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Passengers in Sudden Plane Vertical Drop: Effects
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Need Help Understanding Electric Flux and Electric Flux Density
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Is my interpretation of the Atwood's Machine problem correct?
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Halliday, Resnick & Krane Chapter 5: Force on Pulley
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Finding frequency of microwaves
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Calculate the volume change with gas temperature for this piston in a cylinder
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Help Plotting Phase Difference using LTSpice please
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Degeneracy of the energy level
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Finding the voltage of the circuit (resistor ladder)
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Opposite Induced Currents in Circuit Explanation
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Finding path difference of EM waves received by radio telecopes
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Solid angle in an optics problem (artificial irradiance of the Earth)
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Understanding E=F/q: Solving for E at a Specific Point q_p
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Please help me find what 't' is (Plane flying across the Atlantic Ocean)
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Centripetal Acceleration grade 12 (forces on a bird pulling out of a dive)
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Trouble with FBD: Is There an Upward Force?
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Please check my solutions -- Mass being pulled with an angled rope
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Explain the Schrodinger equation
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Expression for the magnitude of an electric field
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Am I overthinking this? (Noise cancelling headphones for airplane noise)
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Magnetic field - General current in a cube
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Struggling to find solution to 1D wave equation in the following form:
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Relation between Electric field and Magnetic field?
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Equilibrium of a stiff plate on inclined planes
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Is Fgy the Same as FN in a System with Two Masses and Friction?
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A.C. generator -> why does the current reverse?
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Time Dependence of Wave Function
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Infinite Square Well with Multiple Particles
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How to Calculate Heat Generated on R2 After Finding Voltage and Charge?
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Equilibrium of a stiff plate on inclined planes
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Mean Free Path (Introductory Thermal Physics)
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Eddy currents in electromagnetic train
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Current in RLC Series Circuit: Need Help
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Rail Car with a Sail in the Wind
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Help with Coulomb's law: Net electrostatic force
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Average acceleration of an arrow by a bow
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Trouble with Plasma Frequency Calculation
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Number of ways for total spin-1
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Gr. 12 Dynamics -- A performer being lifted up by two ropes
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Determine the direction of a spin state given the state
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Difference between N/m^2 and N/m^-2
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Average acceleration of a car changing speed and direction
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Can you use speed and velocity interchangeably?
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When an object is accelerating, does speed, velocity, or force change?
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Calculate number of photons absorbed
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Identifying which region in the conductor experiences a greater force
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Projectile motion problem (moving ships firing a projectile)
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A mass collides with an inclined plane
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How Does Vorticity Relate to Blood Flow Dynamics?
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Standing waves between two speakers in phase
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Question about how light bulb brightness varies when an AC supply is used
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How long does it take for the disk to stop rotating?
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Find the center of mass of an arc
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How Does a Ping Pong Ball Behave in Zero Gravity?
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Identifying which region of a conductor experiences the greater force
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Sketch the Electric Field at point "A" due to the two point charges
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Why a lamp with X PD passes Y current
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Understanding the Interaction Between a Charged Rod and a Metal Sphere
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What is the tension of the rope?
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Rifleman standing between two cliffs hears two echos from a single shot
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Show that the given electric field is a plane wave
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Can I use the principle of conservation of energy for this problem?
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Did I Calculate the Correct Derivative to Validate Faraday's Law?
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Multivariable Calculus proof for Optics
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Does Poiseuille's Law apply for vertical motion of fluids down a tube?
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What is the relationship between pressure and flow rate?
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Sanity check please -- Load cable swinging outward on a rotating crane
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Collision between two uniformly moving particles
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Displacements in a system of two masses connected by three springs
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What happens if the normal reaction force is less than zero?
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Understanding the Energy Required to Lift Walls
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Restrictions on the frame of reference
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Forces acting on a moving crane
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Using virtual work to find the angle of a bar supported by two planes
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Determining v from momentum / impulse
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Velocity-distance graph for a freely falling body
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Derivation of "arcsin" phase shift formula
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Static lift: How to calculate the volume of displaced fluids?
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The Electric Field and Potential Energy in a Spring System
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Why is the value of EMF generated by a generator not zero at t = 0 s?
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What is the perceived relative velocity of these two motorcycles?
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Lost in the Distance: Navigating Measurement
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Compute relativistic addition of velocities
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Force of water against a dam gate
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Magnetic field of a permanently magnetized cylinder
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How to determine Refractive Index without using the Refractive Angle?
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Change in heat and internal energy
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Finding Color of Two Lights Given Slit Source & Screen Distance
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