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
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71K
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Hey I posted in homework help but now it's gone
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Homework Help: Introductory Physics Formulary
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142K
How do I derive an expression for the velocity vector for any α?
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26
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1K
Difficulty understanding the reasoning behind constraint equations in mechanical systems
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13
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337
Electric potential due to shell containing a charge at an offset outside
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5
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595
Working out the accelerations in a double Atwood pulley system
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25
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2K
Correct statement about size of wire to produce larger extension
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18
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2K
Charge inside nested spheres
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1
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494
Pressure difference between two points in a tapered pipe
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6
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804
Simple problem with voltages
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6
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635
Magnitude of buoyant force in fluids of different densities
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17
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2K
Voltage vs Distance graph for a given E vs D graph
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9
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633
Correct statement about random process of radioactive decay
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12
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2K
Curving of gravitational field lines
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9
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1K
Is it possible for a vertical rod balancing on a table to lose contact by striking the top of the rod?
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7
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3K
Bernoulli vs real life experiment
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16
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2K
Which one is correct statement regarding lightning?
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9
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807
Cone on horizontal surface
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16
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2K
Chain falling out of a horizontal tube onto a table
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4
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100
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6K
Earthed plates confusion
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2
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31
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2K
2 pulleys 3 masses problems
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8
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755
Force between two halves of a current carrying hollow cylinder
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3
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645
Two-layer dielectric, four-capacitor model vs three-capacitor model
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5
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782
Proof of law of sines using cross product
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10
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883
Magnetic field due to a coil wound on a hemsiphere
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6
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743
Falling capacitor connected to constant voltage
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3
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694
Decrease of amplitude in RLC circuit
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5
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953
Coulomb's force vs the Lorentz force
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29
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2K
Cone Rolling on Conical Surface Dynamics
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2
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684
Speed of moth related to Doppler Effect
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8
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941
Struggling to make relation between elastic force and height
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11
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977
Correct statement about a reservoir with an outlet pipe
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21
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1K
Correct statement about siphon used to empty water tank
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11
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834
Bullet collision question
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6
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673
Power of a thin lens in a medium is 1/fₘ or μₘ/fₘ ?
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16
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907
Confusion on sign convention in X-ray problems
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4
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597
Minimum height of water to make the particle visible
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4
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715
Ice cube in water: entropy calculation (Calorimetry)
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6
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682
Flux through a ring due to two charges
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10
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849
Static Mechanics: Aircraft Nosewheel Linkage Torque
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4
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796
Stacked blocks & pulley system
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7
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817
Voltmeter readings for this circuit with switches
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17
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1K
Formula for Electromotive force?
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4
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758
Trying to understand the logic behind adding vectors with an angle between them
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14
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999
Rolling without slipping on a curved surface
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3
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3K
A bead-mass oscillatory system problem
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13
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1K
Problem about units conversion: cm^2 --> m^2
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4
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755
Correct statement about movement of curve ball in a fluid
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9
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648
Mechanics question: Three masses and a pulley on a tabletop
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3
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647
How to find eddy current (circular) path in this pendulum experiment?
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9
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741
Mechanics homework confusion
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2
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600
Why can I neglect angular momentum due to precession here?
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9
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944
Egg Drop Challenge! Need ideas for winning designs
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8
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1K
Multiple reflections in a mirror system
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5
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598
How fast is the fly's shadow moving?
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11
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637
Struggling to understand the concept of this question (ice cube in water optics question)
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29
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1K
Electromagnetic field theory -- Potential inside a conducting sphere
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9
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731
2 wires attached to another wire attached to a block
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9
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519
Phase relation between two waves
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4
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623
Understanding Forces and their Vector Components
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8
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826
I've come across another fluid pressure problem I don't understand
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2
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43
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1K
I need help making a relation between piezoelectricity and earthquake
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3
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573
Variable mass system : water sprayed into a moving container
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27
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1K
What Determines the Minimum Mass of a Block in a Collision Scenario?
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4
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676
Adding and subtracting vectors using vector diagrams
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5
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656
Electric field due to charges between 2 parallel infinite planes
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9
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868
Sources for Physics Research Paper on Rotational Blade Motion on Helicopter
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4
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629
Spherical capacitor RC system -- determine steady state charges
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713
Acceleration of a wedge: What forces act on the wedge?
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4
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838
What Determines the Minimum Mass of Block B for Movement on an Inclined Plane?
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1K
Why is the derivative of the potential at a surface assumed to be continuous even though there is surface charge?
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654
Current through shorted branch -- clarification
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712
Different way to find center of mass of Hollow hemisphere
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6
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672
Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations
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720
Errors and significant figures
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25
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Collision of a bullet on a rod-string system: query
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3
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4K
Explain this asphalt sheen
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10
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822
Can terminal velocity be determined from the information given?
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7
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715
A cylinder connected to a hanging mass
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21
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1K
Compton shift problem
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9
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700
Atwood's with a cylinder - Rotational Motion
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13
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2K
Help me to clear my doubt about a problem of Classical Mechanics (Car and Bicycle)
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6
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673
Tension in a string connecting two blocks having equal and opposite velocities
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21
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996
Physics Problem on Tension in Water
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19
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782
Physics Extended Essay about Gauss' law and/or Lorentz force
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4
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2K
Toboggan on circular arcs
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12
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780
Will Y-Direction Motion Cease with X-Direction Acceleration Only?
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Projectile problem: A block released from a balloon
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5
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650
Help on reflection of a wave from fixed end without transmission
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1K
Electric field due to arc shaped thin rod
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13
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767
Angular Momentum- Conserved or not?
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1K
Irodov- 1.123- Simple conceptual question with two masses connected by a spring
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20
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Vertical Circular motion- A confusing question
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29
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1K
Most probable velocity from Maxwell-Boltzmann distribution
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5
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771
Reconcile poundforce w/slug and lbmass
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25
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Not a typical RL circuit...
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4
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759
Problem with pulleys - two fixed and one movable
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22
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1K
Is this an oversimplification? (treating a lens as a set of prisms)
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790
Change in Displacement Formulation
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797
Definition of pound force
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700
Current through an inductor as a function of time
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A hanging ring carrying current in a uniform magnetic field
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10
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917