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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.
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Homework Help Guidelines for Students and Helpers
Sep 23, 2014
Replies
2
Views
70K
Sticky
Hey I posted in homework help but now it's gone
May 10, 2014
Replies
0
Views
29K
Sticky
Homework Help: Introductory Physics Formulary
Mar 17, 2012
Replies
6
Views
141K
Coulomb's force vs the Lorentz force
11 minutes ago
Replies
22
Views
632
Speed of moth related to Doppler Effect
Tuesday, 8:14 PM
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8
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244
Struggling to make relation between elastic force and height
Tuesday, 6:18 AM
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11
Views
272
Correct statement about a reservoir with an outlet pipe
Oct 27, 2025
Replies
21
Views
355
Correct statement about siphon used to empty water tank
Oct 27, 2025
Replies
11
Views
267
Bullet collision question
Oct 25, 2025
Replies
6
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161
Power of a thin lens in a medium is 1/fₘ or μₘ/fₘ ?
Oct 24, 2025
Replies
16
Views
221
Confusion on sign convention in X-ray problems
Oct 24, 2025
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4
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132
Minimum height of water to make the particle visible
Oct 23, 2025
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4
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172
Ice cube in water: entropy calculation (Calorimetry)
Oct 23, 2025
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6
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145
Flux through a ring due to two charges
Oct 21, 2025
Replies
10
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185
Static Mechanics: Aircraft Nosewheel Linkage Torque
Oct 20, 2025
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4
Views
171
Stacked blocks & pulley system
Oct 18, 2025
Replies
7
Views
173
Voltmeter readings for this circuit with switches
Oct 18, 2025
Replies
17
Views
317
Formula for Electromotive force?
Oct 18, 2025
Replies
4
Views
163
Trying to understand the logic behind adding vectors with an angle between them
Oct 17, 2025
Replies
14
Views
334
Rolling without slipping on a curved surface
Oct 14, 2025
2
Replies
81
Views
1K
A bead-mass oscillatory system problem
Oct 14, 2025
Replies
13
Views
523
Problem about units conversion: cm^2 --> m^2
Oct 12, 2025
Replies
4
Views
210
Correct statement about movement of curve ball in a fluid
Oct 12, 2025
Replies
9
Views
155
Mechanics question: Three masses and a pulley on a tabletop
Oct 9, 2025
Replies
3
Views
144
How to find eddy current (circular) path in this pendulum experiment?
Oct 8, 2025
Replies
9
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201
Mechanics homework confusion
Oct 7, 2025
Replies
2
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152
Why can I neglect angular momentum due to precession here?
Oct 6, 2025
Replies
9
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384
Egg Drop Challenge! Need ideas for winning designs
Oct 6, 2025
Replies
8
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272
Multiple reflections in a mirror system
Oct 5, 2025
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5
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131
How fast is the fly's shadow moving?
Oct 4, 2025
Replies
11
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151
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Oct 4, 2025
Replies
29
Views
357
Electromagnetic field theory -- Potential inside a conducting sphere
Oct 4, 2025
Replies
9
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169
2 wires attached to another wire attached to a block
Oct 3, 2025
Replies
9
Views
130
Phase relation between two waves
Oct 2, 2025
Replies
4
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145
Understanding Forces and their Vector Components
Oct 2, 2025
Replies
8
Views
283
I've come across another fluid pressure problem I don't understand
Sep 29, 2025
Replies
43
Views
454
I need help making a relation between piezoelectricity and earthquake
Sep 28, 2025
Replies
3
Views
151
Variable mass system : water sprayed into a moving container
Sep 27, 2025
Replies
27
Views
486
What Determines the Minimum Mass of a Block in a Collision Scenario?
Sep 25, 2025
Replies
4
Views
194
Adding and subtracting vectors using vector diagrams
Sep 25, 2025
Replies
5
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177
Electric field due to charges between 2 parallel infinite planes
Sep 24, 2025
Replies
9
Views
271
Sources for Physics Research Paper on Rotational Blade Motion on Helicopter
Sep 22, 2025
Replies
4
Views
160
Spherical capacitor RC system -- determine steady state charges
Sep 22, 2025
Replies
6
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218
Acceleration of a wedge: What forces act on the wedge?
Sep 22, 2025
Replies
4
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353
What Determines the Minimum Mass of Block B for Movement on an Inclined Plane?
Sep 18, 2025
Replies
22
Views
392
Why is the derivative of the potential at a surface assumed to be continuous even though there is surface charge?
Sep 17, 2025
Replies
1
Views
193
Current through shorted branch -- clarification
Sep 17, 2025
Replies
9
Views
213
Different way to find center of mass of Hollow hemisphere
Sep 15, 2025
Replies
6
Views
205
Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations
Sep 14, 2025
Replies
15
Views
257
Errors and significant figures
Sep 12, 2025
Replies
25
Views
410
Collision of a bullet on a rod-string system: query
Sep 12, 2025
2
Replies
71
Views
2K
Explain this asphalt sheen
Sep 8, 2025
Replies
10
Views
327
Can terminal velocity be determined from the information given?
Sep 8, 2025
Replies
7
Views
270
A cylinder connected to a hanging mass
Sep 8, 2025
Replies
21
Views
492
Compton shift problem
Sep 8, 2025
Replies
9
Views
195
Atwood's with a cylinder - Rotational Motion
Sep 7, 2025
Replies
13
Views
1K
Help me to clear my doubt about a problem of Classical Mechanics (Car and Bicycle)
Sep 6, 2025
Replies
6
Views
222
Tension in a string connecting two blocks having equal and opposite velocities
Sep 5, 2025
Replies
21
Views
485
Physics Problem on Tension in Water
Sep 2, 2025
Replies
19
Views
344
Physics Extended Essay about Gauss' law and/or Lorentz force
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Replies
4
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2K
Toboggan on circular arcs
Aug 30, 2025
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12
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280
Will Y-Direction Motion Cease with X-Direction Acceleration Only?
Aug 29, 2025
Replies
30
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653
Projectile problem: A block released from a balloon
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5
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231
Help on reflection of a wave from fixed end without transmission
Aug 28, 2025
Replies
30
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536
Electric field due to arc shaped thin rod
Aug 27, 2025
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13
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293
Angular Momentum- Conserved or not?
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Replies
17
Views
510
Irodov- 1.123- Simple conceptual question with two masses connected by a spring
Aug 23, 2025
Replies
20
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741
Vertical Circular motion- A confusing question
Aug 22, 2025
Replies
29
Views
572
Most probable velocity from Maxwell-Boltzmann distribution
Aug 13, 2025
Replies
5
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296
Reconcile poundforce w/slug and lbmass
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Replies
25
Views
506
Not a typical RL circuit...
Aug 11, 2025
Replies
4
Views
305
Problem with pulleys - two fixed and one movable
Aug 6, 2025
Replies
22
Views
510
Is this an oversimplification? (treating a lens as a set of prisms)
Aug 3, 2025
Replies
10
Views
342
Change in Displacement Formulation
Aug 1, 2025
Replies
6
Views
363
Definition of pound force
Jul 31, 2025
Replies
3
Views
280
Current through an inductor as a function of time
Jul 30, 2025
Replies
10
Views
474
A hanging ring carrying current in a uniform magnetic field
Jul 28, 2025
Replies
10
Views
449
Flux through a cylindrical surface enclosing part of a sphere
Jul 27, 2025
Replies
9
Views
638
Specific heat capacity and latent heat
Jul 27, 2025
Replies
2
Views
391
Calculating the Planck Length
Jul 27, 2025
Replies
3
Views
372
Can a dipole be modeled as a point charge?
Jul 25, 2025
Replies
10
Views
617
Calculate the radius of gyration for a plane figure
Jul 24, 2025
Replies
6
Views
390
Dynamics of Circular Motion
Jul 23, 2025
Replies
12
Views
597
Calculating acceleration of a prism and block connected to a wall through a rope and pulley
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Replies
4
Views
473
Block drifts off between two moving planes through friction
Jul 21, 2025
Replies
21
Views
898
The sign of the change in potential
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Replies
7
Views
563
How come violet, with the shortest wavelength, is refracted the most?
Jul 20, 2025
Replies
3
Views
377
Calculating the time needed until a known velocity for a vehicle with friction as a function of velocity
Jul 20, 2025
Replies
3
Views
445
Question About homework on Coulomb's Law
Jul 16, 2025
Replies
8
Views
708
Variable Mass system : Sand falling into a Freight car
Jul 15, 2025
Replies
6
Views
553
Spherical conducting shell enclosing a non-conducting core
Jul 14, 2025
Replies
5
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479
Concentric conducting cylinders
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Replies
7
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683
Slight Confusion in Introductory Mechanics (Dynamics Problem)
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Replies
15
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821
The flux through a cylinder from a charge at the origin
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5
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485
Writing a vector parallel and normal to a unit vector ##\hat n##
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26
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1K
Equilibrium Position of a Hanging Candy Cane
Jul 6, 2025
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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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Replies
14
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565
LC oscillations - two capacitors and an inductor
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Replies
15
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686
Angular motion of a car wheel traveling at certain speed
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Replies
12
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875
5 charges within a square boundary
Jun 29, 2025
Replies
7
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681
Newton's law of gravitation, energy and centre of mass question
Jun 27, 2025
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6
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626
Acceleration of an Electron in a Uniform Electric Field
Jun 26, 2025
Replies
2
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569
Two charged spheres connected to walls by two springs
Jun 26, 2025
Replies
7
Views
648
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