Introductory Physics Homework Help Forum

Post thread
Free introductory physics homework help step by step from qualified mentors. Algebra and calculus based general physics homework. High school and undergraduate level.
  • Sticky
Homework Help Guidelines for Students and Helpers
  • · Replies 2 ·
Replies
2
Views
70K
  • Sticky
Hey I posted in homework help but now it's gone
  • · Replies 0 ·
Replies
0
Views
30K
  • Sticky
Homework Help: Introductory Physics Formulary
  • · Replies 6 ·
Replies
6
Views
141K
Correct statement about size of wire to produce larger extension
  • · Replies 12 ·
Replies
12
Views
615
Correct statement about random process of radioactive decay
  • · Replies 12 ·
Replies
12
Views
1K
Curving of gravitational field lines
  • · Replies 9 ·
Replies
9
Views
1K
Is it possible for a vertical rod balancing on a table to lose contact by striking the top of the rod?
  • · Replies 7 ·
Replies
7
Views
2K
Bernoulli vs real life experiment
  • · Replies 16 ·
Replies
16
Views
2K
Which one is correct statement regarding lightning?
  • · Replies 9 ·
Replies
9
Views
570
Cone on horizontal surface
  • · Replies 16 ·
Replies
16
Views
1K
Chain falling out of a horizontal tube onto a table
  • · Replies 100 ·
4
Replies
100
Views
5K
Earthed plates confusion
  • · Replies 31 ·
2
Replies
31
Views
1K
2 pulleys 3 masses problems
  • · Replies 8 ·
Replies
8
Views
529
Force between two halves of a current carrying hollow cylinder
  • · Replies 3 ·
Replies
3
Views
425
Two-layer dielectric, four-capacitor model vs three-capacitor model
  • · Replies 5 ·
Replies
5
Views
567
Proof of law of sines using cross product
  • · Replies 10 ·
Replies
10
Views
669
Magnetic field due to a coil wound on a hemsiphere
  • · Replies 6 ·
Replies
6
Views
506
Falling capacitor connected to constant voltage
  • · Replies 3 ·
Replies
3
Views
493
Decrease of amplitude in RLC circuit
  • · Replies 5 ·
Replies
5
Views
723
Coulomb's force vs the Lorentz force
  • · Replies 29 ·
Replies
29
Views
2K
Cone Rolling on Conical Surface Dynamics
  • · Replies 2 ·
Replies
2
Views
472
Speed of moth related to Doppler Effect
  • · Replies 8 ·
Replies
8
Views
728
Struggling to make relation between elastic force and height
  • · Replies 11 ·
Replies
11
Views
701
Correct statement about a reservoir with an outlet pipe
  • · Replies 21 ·
Replies
21
Views
788
Correct statement about siphon used to empty water tank
  • · Replies 11 ·
Replies
11
Views
612
Bullet collision question
  • · Replies 6 ·
Replies
6
Views
463
Power of a thin lens in a medium is 1/fₘ or μₘ/fₘ ?
  • · Replies 16 ·
Replies
16
Views
633
Confusion on sign convention in X-ray problems
  • · Replies 4 ·
Replies
4
Views
413
Minimum height of water to make the particle visible
  • · Replies 4 ·
Replies
4
Views
511
Ice cube in water: entropy calculation (Calorimetry)
  • · Replies 6 ·
Replies
6
Views
466
Flux through a ring due to two charges
  • · Replies 10 ·
Replies
10
Views
612
Static Mechanics: Aircraft Nosewheel Linkage Torque
  • · Replies 4 ·
Replies
4
Views
569
Stacked blocks & pulley system
  • · Replies 7 ·
Replies
7
Views
545
Voltmeter readings for this circuit with switches
  • · Replies 17 ·
Replies
17
Views
788
Formula for Electromotive force?
  • · Replies 4 ·
Replies
4
Views
537
Trying to understand the logic behind adding vectors with an angle between them
  • · Replies 14 ·
Replies
14
Views
739
Rolling without slipping on a curved surface
  • · Replies 81 ·
3
Replies
81
Views
2K
A bead-mass oscillatory system problem
  • · Replies 13 ·
Replies
13
Views
927
Problem about units conversion: cm^2 --> m^2
  • · Replies 4 ·
Replies
4
Views
528
Correct statement about movement of curve ball in a fluid
  • · Replies 9 ·
Replies
9
Views
446
Mechanics question: Three masses and a pulley on a tabletop
  • · Replies 3 ·
Replies
3
Views
444
How to find eddy current (circular) path in this pendulum experiment?
  • · Replies 9 ·
Replies
9
Views
525
Mechanics homework confusion
  • · Replies 2 ·
Replies
2
Views
427
Why can I neglect angular momentum due to precession here?
  • · Replies 9 ·
Replies
9
Views
715
Egg Drop Challenge! Need ideas for winning designs
  • · Replies 8 ·
Replies
8
Views
701
Multiple reflections in a mirror system
  • · Replies 5 ·
Replies
5
Views
410
How fast is the fly's shadow moving?
  • · Replies 11 ·
Replies
11
Views
437
Struggling to understand the concept of this question (ice cube in water optics question)
  • · Replies 29 ·
Replies
29
Views
890
Electromagnetic field theory -- Potential inside a conducting sphere
  • · Replies 9 ·
Replies
9
Views
503
2 wires attached to another wire attached to a block
  • · Replies 9 ·
Replies
9
Views
383
Phase relation between two waves
  • · Replies 4 ·
Replies
4
Views
438
Understanding Forces and their Vector Components
  • · Replies 8 ·
Replies
8
Views
608
I've come across another fluid pressure problem I don't understand
  • · Replies 43 ·
2
Replies
43
Views
1K
I need help making a relation between piezoelectricity and earthquake
  • · Replies 3 ·
Replies
3
Views
403
Variable mass system : water sprayed into a moving container
  • · Replies 27 ·
Replies
27
Views
953
What Determines the Minimum Mass of a Block in a Collision Scenario?
  • · Replies 4 ·
Replies
4
Views
487
Adding and subtracting vectors using vector diagrams
  • · Replies 5 ·
Replies
5
Views
475
Electric field due to charges between 2 parallel infinite planes
  • · Replies 9 ·
Replies
9
Views
635
Sources for Physics Research Paper on Rotational Blade Motion on Helicopter
  • · Replies 4 ·
Replies
4
Views
451
Spherical capacitor RC system -- determine steady state charges
  • · Replies 6 ·
Replies
6
Views
508
Acceleration of a wedge: What forces act on the wedge?
  • · Replies 4 ·
Replies
4
Views
641
What Determines the Minimum Mass of Block B for Movement on an Inclined Plane?
  • · Replies 22 ·
Replies
22
Views
866
Why is the derivative of the potential at a surface assumed to be continuous even though there is surface charge?
  • · Replies 1 ·
Replies
1
Views
475
Current through shorted branch -- clarification
  • · Replies 9 ·
Replies
9
Views
512
Different way to find center of mass of Hollow hemisphere
  • · Replies 6 ·
Replies
6
Views
497
Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations
  • · Replies 15 ·
Replies
15
Views
528
Errors and significant figures
  • · Replies 25 ·
Replies
25
Views
851
Collision of a bullet on a rod-string system: query
  • · Replies 71 ·
3
Replies
71
Views
3K
Explain this asphalt sheen
  • · Replies 10 ·
Replies
10
Views
609
Can terminal velocity be determined from the information given?
  • · Replies 7 ·
Replies
7
Views
534
A cylinder connected to a hanging mass
  • · Replies 21 ·
Replies
21
Views
1K
Compton shift problem
  • · Replies 9 ·
Replies
9
Views
497
Atwood's with a cylinder - Rotational Motion
  • · Replies 13 ·
Replies
13
Views
1K
Help me to clear my doubt about a problem of Classical Mechanics (Car and Bicycle)
  • · Replies 6 ·
Replies
6
Views
500
Tension in a string connecting two blocks having equal and opposite velocities
  • · Replies 21 ·
Replies
21
Views
793
Physics Problem on Tension in Water
  • · Replies 19 ·
Replies
19
Views
607
Physics Extended Essay about Gauss' law and/or Lorentz force
  • · Replies 4 ·
Replies
4
Views
2K
Toboggan on circular arcs
  • · Replies 12 ·
Replies
12
Views
583
Will Y-Direction Motion Cease with X-Direction Acceleration Only?
  • · Replies 30 ·
2
Replies
30
Views
1K
Projectile problem: A block released from a balloon
  • · Replies 5 ·
Replies
5
Views
478
Help on reflection of a wave from fixed end without transmission
  • · Replies 30 ·
2
Replies
30
Views
997
Electric field due to arc shaped thin rod
  • · Replies 13 ·
Replies
13
Views
548
Angular Momentum- Conserved or not?
  • · Replies 17 ·
Replies
17
Views
818
Irodov- 1.123- Simple conceptual question with two masses connected by a spring
  • · Replies 20 ·
Replies
20
Views
1K
Vertical Circular motion- A confusing question
  • · Replies 29 ·
Replies
29
Views
895
Most probable velocity from Maxwell-Boltzmann distribution
  • · Replies 5 ·
Replies
5
Views
571
Reconcile poundforce w/slug and lbmass
  • · Replies 25 ·
Replies
25
Views
823
Not a typical RL circuit...
  • · Replies 4 ·
Replies
4
Views
569
Problem with pulleys - two fixed and one movable
  • · Replies 22 ·
Replies
22
Views
930
Is this an oversimplification? (treating a lens as a set of prisms)
  • · Replies 10 ·
Replies
10
Views
593
Change in Displacement Formulation
  • · Replies 6 ·
Replies
6
Views
607
Definition of pound force
  • · Replies 3 ·
Replies
3
Views
532
Current through an inductor as a function of time
  • · Replies 10 ·
Replies
10
Views
794
A hanging ring carrying current in a uniform magnetic field
  • · Replies 10 ·
Replies
10
Views
710
Flux through a cylindrical surface enclosing part of a sphere
  • · Replies 9 ·
Replies
9
Views
937
Specific heat capacity and latent heat
  • · Replies 2 ·
Replies
2
Views
648
Calculating the Planck Length
  • · Replies 3 ·
Replies
3
Views
644
Can a dipole be modeled as a point charge?
  • · Replies 10 ·
Replies
10
Views
914
Calculate the radius of gyration for a plane figure
  • · Replies 6 ·
Replies
6
Views
638
Dynamics of Circular Motion
  • · Replies 12 ·
Replies
12
Views
877
Calculating acceleration of a prism and block connected to a wall through a rope and pulley
  • · Replies 4 ·
Replies
4
Views
741
Block drifts off between two moving planes through friction
  • · Replies 21 ·
Replies
21
Views
1K
The sign of the change in potential
  • · Replies 7 ·
Replies
7
Views
839