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.
Stationary observer meaning in relativity problem
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803
Particle moving at speed ##bc## relative to laboratory frame
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20
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941
Why Doesn't Time Dilation Affect Pendulum Observations on a Moving Train?
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8
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897
Two cyclists ride between a pair of towns with and against the wind
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17
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1K
Universal gravitation’s problem -- Balancing gravitational forces from 2 masses
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3
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620
Prove that the field due to a circular arc is same as its bounded tangent at the centre of curvature
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23
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1K
Experimenting whether the diameter of a pot affects boiling time for water
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15
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3K
How to obtain amplitude of current in parallel RLC circuit?
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3
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917
Uniform Motion in 2D - A man chasing a bus
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20
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2K
Understanding the generic nature of linearity in Physics
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2
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1K
Ap physics 1 velocity center of mass question
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4
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819
Self-inductance of LC circuit given rate of capacitor discharge.
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6
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1K
Formula for the average EMF of generator
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6
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1K
Calculation of current in driven series RLC circuit
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8
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2K
Magnetic energy density, self-inductance of coaxial cylindrical shells
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10
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2K
Test question: What is true for a mechanical impact?
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7
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1K
Find work given two conservative forces and a nonconservative force
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9
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1K
Two candles making shadows of one another on opposite walls
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3
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1K
Atmospheric pressure and water pressure - Boyle's law
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6
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1K
Confused about how forces in a pulley balance
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6
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1K
A vertical U tube rotates about the vertical axis -- Find omega to cause this height offset
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15
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1K
IPHO classical mechanics: A mass falls on an exoplanet
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2
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1K
Electric field & force due to charged insulating hemispherical shells
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12
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2K
Induction heat flux density induced by wire in a slab
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0
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1K
Non-Uniform Magnetic Field Calculations
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9
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2K
Power Radiated From a Copper Cube
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3
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1K
Modelling a metal detector using eddy currents from Non-Destructive Testing
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1
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1K
Forces on Elliptical Current Carying Loop
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10
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918
Friction Required for Billiard Ball to Roll without Slipping
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3
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60
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4K
How to find the potential of a field that has regions of non-zero curl
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3
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1K
Sound Wave Diagram Help
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12
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1K
Determine the velocity of the Slider
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5
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6K
Building a Marble Catapult
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3
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1K
Gauge pressure due to a floating body
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4
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2K
Sign conventions for Kirchhoff's loop rule
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7
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2K
Resistance force changing the velocity of an object
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8
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1K
Thermodynamics: Cooling of a heated block of iron in contact with air
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29
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1K
Work done by power supply to maintain a constant current
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0
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670
Unit vectors that change as a function of time
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13
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1K
Electric field at a point inside a non-uniformly charged sphere
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6
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1K
Looking for data about different types of carbon fiber chemical properties
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2
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721
Angular momentum conservation on a merry-go-round
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5
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2K
Power dissipated over 1 cycle of a AC source-free RLC series circuit?
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6
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976
Angular momentum for a bullet and a rod attached to a ceiling
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17
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2K
Force Between 2 Coaxial Current-Carrying Loops
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4
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2K
How Long for a Beam of Light to Reach Earth?
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21
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2K
Particle confined in 3D box - quantum states
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5
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1K
How to Calculate θ3 After Finding θ2 Using Snell's Law?
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9
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748
Electric field vector equation: Finding the neutral point for two charges
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2
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35
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2K
Find number of microstates of combined system
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22
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2K
Experiment measuring the distance dependence of a suspended metal bolt from a magnet
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13
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1K
Induction confusion for induced charge inside a metal conductor
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23
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Significant figures doubt
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3
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717
What would the slope of the force between 2 charged particles vs 1/r^2 give me?
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1
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700
Gauss' law and the potential V (plane layer case)
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7
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1K
Water flowing out of a rotating vessel
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2
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30
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Using Kepler's laws to calculate elliptical planetary motion
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7
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1K
Help with Friction Forces: Box resting on a board on a frictionless surface
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What is the unknown circuit element in RLC circuit given plot of V, I?
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4
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Find at what rate the orbit radius will grow
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2
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Initial velocity of rolling ball
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2
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5K
Did my textbook make a mistake when writing these units?
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5
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943
Fresnel Lens - Solve for Lithography & Power
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0
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680
Physics about electric circuits: Changing the resistors changes the currents
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3
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956
Thermodynamic Work vs Mechanical Work
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3
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1K
Classic Incline problem with cylinder
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13
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1K
Using conservation of energy and momentum in projectile motion
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18
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2K
Torque calculation of CV joint
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2
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1K
Lagrange equation for block and incline
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13
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1K
Fundamental quantities and derived quantities
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5
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722
Projectile Motion Problem Involving Initial Velocity and Gravity Only
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11
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2K
Cart sliding along horizontal with spring connected
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11
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950
Does the voltage across a battery include its internal resistance?
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8
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1K
Calculate electric force using Coulomb's law (vector components are the struggle)
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3
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Two tourists and a bicycle - uniform motion
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How many people can be on the raft?
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10
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1K
Find the magnetic induction vector
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3
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920
Blowing Into Your Own Sail
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25
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2K
Drag Forces and Terminal Velocity
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8
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1K
Why the need to be careful opening a switch on this RL circuit?
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6
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Ratio of frequency between heavier and lighter part of composite cord
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4
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751
Need help, to help, a friend with their HW (High School)
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6
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910
Current in circular wire surrounding infinite solenoid in a circuit
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7
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2K
Determining the sound level of a leaf blower
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1
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934
Average velocity in different coordinate systems
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27
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1K
GRIN Lens - Gradient Coefficient Expression
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5
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1K
Help please on essay about star formation
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5
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1K
Torque on a Pivot Point With Multiple Forces and Different Directions
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6
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2K
Variation of escape velocity with equal surface gravity
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7
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1K
How to calculate gamma ray energies following beta decay?
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12
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Minimum force to tip the bin over
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7
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1K
Depth of a basketball floating on water
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9
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1K
Keplerian Telescope and real image
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7
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Concept about photoelectric effect
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17
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Dynamic system of self balancing robot
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4
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956
Max inversion temperature for a gas (Dieterici’s equation of state)
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4
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Closed cycle of an ideal gas
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3
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2K
Why is the tension in a massive cable always tangent to its portion?
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5
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Statistical mechanics: particles in magnetic fields
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2
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732
Calculating Magnetic Field at Point P for Perpendicular Current-Carrying Wires
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2
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1K