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.
Block drifts off between two moving planes through friction
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21
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1K
The sign of the change in potential
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7
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885
How come violet, with the shortest wavelength, is refracted the most?
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3
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660
Calculating the time needed until a known velocity for a vehicle with friction as a function of velocity
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3
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705
Question About homework on Coulomb's Law
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8
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941
Variable Mass system : Sand falling into a Freight car
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6
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817
Spherical conducting shell enclosing a non-conducting core
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5
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669
Concentric conducting cylinders
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7
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837
Slight Confusion in Introductory Mechanics (Dynamics Problem)
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15
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999
The flux through a cylinder from a charge at the origin
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5
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614
Writing a vector parallel and normal to a unit vector ##\hat n##
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26
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2K
Equilibrium Position of a Hanging Candy Cane
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17
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1K
An interesting GCSE question: Why are electric lamps connected in parallel in house wiring?
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14
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700
LC oscillations - two capacitors and an inductor
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15
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887
Angular motion of a car wheel traveling at certain speed
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12
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1K
5 charges within a square boundary
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7
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796
Newton's law of gravitation, energy and centre of mass question
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6
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731
Acceleration of an Electron in a Uniform Electric Field
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2
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653
Two charged spheres connected to walls by two springs
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7
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751
Measurement technology textbook problems
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1
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744
Ice Core Density Problem (Inspired by NEEM)
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6
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682
Finding the charge on pith balls
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9
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853
2D rigid body mechanics: force applied on sliding cart
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14
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1K
Cutting the Dose Rate in half with shielding
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5
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717
🔹RC Circuit with Series Capacitors — One Pre-Charged, One Uncharged
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11
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998
Measurement technology textbook problems
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2
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652
What is the Final Temperature When Mixing Water and Ice, Assuming All Ice Melts?
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12
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1K
Projectile motion with ##N## bounces on the ground
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21
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1K
How to calculate freezing time for a moist food by-product (75% water)
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6
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870
A lead bullet gets embedded in a lead block
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17
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802
Can the braking force be significantly greater than the force acting on the brake structure?
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25
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1K
Question on magnetism: Circular motion of charged particle in a Magnetic Field
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2
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34
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2K
A question about a wheel rolling without slipping while tied to a cube
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11
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974
Thermally insulated container with alternating series of walls
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2
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49
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3K
Can somebody explain what is happening here? (sunlight refracting in Earth's atmosphere)
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12
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920
An exploding cannon shell
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4
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904
How to Calculate Amplitude Decrease in Damped Harmonic Motion After 10 Cycles?
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3
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842
Minimum angular velocity of a point mass on a rotating rod
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5
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856
Roller coaster mock Lab Report
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9
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856
Faraday's Law and magnetic flux
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3
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780
Physics exercise: Pressure in this Fresh Water Tank
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3
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751
Finding displacement from position time graph
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4
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759
Acceleration of beads on a ring
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5
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896
Rope between inclines with maximum length of hanging middle portion
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2
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46
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4K
What is the derivation of the second equation for area velocity?
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3
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2K
Find in terms of ##h## when ##P## comes instantaneously to rest
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2
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36
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3K
A stone is dropped from an ascending balloon...
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10
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1K
Any Edexcel A Level Physics Teachers Here - Paper 1 Q13?
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13
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1K
Coulomb’s Law Problem: Electrostatic Forces Between Charges
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6
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918
Calculating flux through a plane cutting two concentric cylinders
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26
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1K
Identical cones rotating while in contact with each other
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12
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1K
Ford Nucleon -- Fission Powered Car Calculation
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3
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739
Collision between snooker balls
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3
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916
Introductory Physics: Connection of Resistors ...
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15
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1K
Friction on a spinning wheel when it is dropped onto the ground
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2
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30
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1K
Frequency to wavelength question (thermal Doppler broadening)
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3
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906
Working out the accelerations in a double Atwood pulley system
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22
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2K
Acceleration of a Block Sliding Down a Wedge
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3
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1K
Calculating velocity of a particle if distances are constant
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11
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1K
How to find motional emf w/o an equation for mag field?
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7
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793
Calculating the voltage across capacitors and resistors with switches
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2
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920
Find V-I characteristic for this circuit with ideal diode
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2
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2K
Purcell Electromagnetism p.301-303: "the longitudinal current I flows, in effect, on the cylinder itself"?
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1
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848
Acceleration of the midpoint of a light rod
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3
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970
Work Done in slowly pulling a thread
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28
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2K
Field of contact forces
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6
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1K
Determine the Thevenin equivalent circuit
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2
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2K
Angular Momentum Problem: Mouse walking on a rotating turntable
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5
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1K
Earthing of two parallel conducting plates
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11
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1K
Purcell 1.77 Electron jelly
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2
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980
How can voltage between unlike charges decrease with proximity?
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4
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910
Wave interference, "beats" problem
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19
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1K
Aerodynamics of a helicopter blade
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4
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1K
Which pairs of these diagrams represent equivalent circuits?
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4
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875
I want to know if the sketch I've drawn of the catenary suits the exercise
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11
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1K
Trying to study for my exam but got stuck on exercise
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7
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987
Direction and magnitude of electric field produced by current change
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8
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1K
Average battery current in battery charger
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7
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1K
Electrostatics: Gauss' Law Problem Finding the Flux through a Conducting Spherical Shell
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9
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2K
Questions about a capacitor with 4 parallel plates
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14
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1K
Drop of voltage between terminals while conductive rod is rotating
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5
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1K
Motion puzzle: Bird flying between a train and a platform
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3
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84
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5K
Debugging a Kelvin Water Dropper
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10
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2K
Electric displacement field density equation
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1
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958
Calculating of currents in a circuit
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2
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825
Force to move a 24 tonne truck one foot in one second
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10
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1K
Why does the propagation constant in the Helmholtz equation include j?
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3
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1K
Record Player Physics
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7
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1K
Dielectric boundary value problems
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2
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893
Polarisation of dielectric materials
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5
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820
Capacitors, equipotentials, and electric fields
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5
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1K
How do you calculate the pull of this piston?
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27
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1K
Coin sliding on a table slides across an expanding fabric tape
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1
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782
Combined tensions of an RLC series circuit with AC current
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3
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1K
Terminal velocity and acceleration
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7
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1K
Clarifying the Definition Total/Stagnation Pressure (p₀) in Bernoulli'
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2
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1K
A particle's momentum in a magnetic field
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3
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1K
The energy needed to construct a charged hollow spherical shell with finite thickness
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1
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878
Calculation of charge flowing through a loop
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7
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1K
Height of the image of my friend on the film
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2
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780