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.
IPHO classical mechanics: A mass falls on an exoplanet
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2
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919
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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929
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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914
Modelling a metal detector using eddy currents from Non-Destructive Testing
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1
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990
Forces on Elliptical Current Carying Loop
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10
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800
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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606
Unit vectors that change as a function of time
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13
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868
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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644
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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863
Angular momentum for a bullet and a rod attached to a ceiling
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17
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1K
Force Between 2 Coaxial Current-Carrying Loops
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4
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1K
How Long for a Beam of Light to Reach Earth?
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21
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1K
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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666
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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1K
Experiment measuring the distance dependence of a suspended metal bolt from a magnet
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13
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992
Induction confusion for induced charge inside a metal conductor
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23
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1K
Significant figures doubt
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3
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648
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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620
Gauss' law and the potential V (plane layer case)
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7
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884
Water flowing out of a rotating vessel
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2
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30
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1K
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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5
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1K
What is the unknown circuit element in RLC circuit given plot of V, I?
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4
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878
Find at what rate the orbit radius will grow
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2
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30
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2K
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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841
Fresnel Lens - Solve for Lithography & Power
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0
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608
Physics about electric circuits: Changing the resistors changes the currents
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3
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887
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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646
Projectile Motion Problem Involving Initial Velocity and Gravity Only
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11
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1K
Cart sliding along horizontal with spring connected
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11
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819
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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1K
Two tourists and a bicycle - uniform motion
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25
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1K
How many people can be on the raft?
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10
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946
Find the magnetic induction vector
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3
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810
Blowing Into Your Own Sail
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25
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1K
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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1K
Ratio of frequency between heavier and lighter part of composite cord
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4
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693
Need help, to help, a friend with their HW (High School)
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6
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820
Current in circular wire surrounding infinite solenoid in a circuit
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7
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1K
Determining the sound level of a leaf blower
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1
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827
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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2K
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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1K
Concept about photoelectric effect
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17
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2K
Dynamic system of self balancing robot
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4
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818
Max inversion temperature for a gas (Dieterici’s equation of state)
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4
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1K
Closed cycle of an ideal gas
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3
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1K
Why is the tension in a massive cable always tangent to its portion?
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5
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2K
Statistical mechanics: particles in magnetic fields
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2
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659
Calculating Magnetic Field at Point P for Perpendicular Current-Carrying Wires
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2
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1K
Calculation of Ramp Jump Distance Using Projectile Motion Formulas?
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12
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1K
Help with designing a power generating system
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3
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655
Max Impulse on a pendulum
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1
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886
Angle that makes kinetic and potential energy of simple pendulum equal
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2
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1K
Introduce a battery to an LR circuit
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16
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1K
Planar pendulum with rotating pivot
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7
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791
What Are the Assumptions and Calculations for Sheet of Charge Theory?
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1
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1K
Cables, pulleys, 2 weights
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4
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705
Balmer series experiment
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2
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1K
Spherical pendulum confusion [Issue resolved]
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2
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604
Launch service between two stations along a flowing river
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21
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1K
Book plots position & force on the same graph, still gets right answer
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8
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930
Why is source force + electrostatic force = 0 inside battery?
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10
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2K
Relativistic motion and length contraction
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2
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44
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2K
Circular motion doubt: Angular velocity vector for general planar motion about a point in the plane
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6
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818
Critical frequency of Faraday Waves?
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6
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1K
Find starting velocity from golfer launching ball
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7
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761
Why is the electric field inside a conducting hollow/filled sphere zero?
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2
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814
Slope of N - t graph of radioactive decay
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2
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830
Question about Feynman diagram showing annihilation
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4
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816
Coupled oscillator question
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2
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736