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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369
Electric potential due to shell containing a charge at an offset outside
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5
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613
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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505
Pressure difference between two points in a tapered pipe
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6
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827
Simple problem with voltages
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6
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644
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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645
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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812
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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774
Force between two halves of a current carrying hollow cylinder
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3
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652
Two-layer dielectric, four-capacitor model vs three-capacitor model
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5
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788
Proof of law of sines using cross product
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10
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892
Magnetic field due to a coil wound on a hemsiphere
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6
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749
Falling capacitor connected to constant voltage
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3
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701
Decrease of amplitude in RLC circuit
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5
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964
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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689
Speed of moth related to Doppler Effect
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8
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949
Struggling to make relation between elastic force and height
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11
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987
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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844
Bullet collision question
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6
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683
Power of a thin lens in a medium is 1/fₘ or μₘ/fₘ ?
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16
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918
Confusion on sign convention in X-ray problems
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4
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603
Minimum height of water to make the particle visible
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4
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722
Ice cube in water: entropy calculation (Calorimetry)
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6
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690
Flux through a ring due to two charges
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10
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860
Static Mechanics: Aircraft Nosewheel Linkage Torque
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4
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805
Stacked blocks & pulley system
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7
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830
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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763
Trying to understand the logic behind adding vectors with an angle between them
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14
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1K
Rolling without slipping on a curved surface
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3
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81
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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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761
Correct statement about movement of curve ball in a fluid
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9
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656
Mechanics question: Three masses and a pulley on a tabletop
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3
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652
How to find eddy current (circular) path in this pendulum experiment?
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9
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747
Mechanics homework confusion
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2
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606
Why can I neglect angular momentum due to precession here?
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9
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954
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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602
How fast is the fly's shadow moving?
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11
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646
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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736
2 wires attached to another wire attached to a block
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9
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523
Phase relation between two waves
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4
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630
Understanding Forces and their Vector Components
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8
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833
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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581
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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682
Adding and subtracting vectors using vector diagrams
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5
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662
Electric field due to charges between 2 parallel infinite planes
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9
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879
Sources for Physics Research Paper on Rotational Blade Motion on Helicopter
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636
Spherical capacitor RC system -- determine steady state charges
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720
Acceleration of a wedge: What forces act on the wedge?
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4
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843
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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661
Current through shorted branch -- clarification
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719
Different way to find center of mass of Hollow hemisphere
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6
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679
Calculation of Tensile Forces in Piston-Type Water-Lifting Devices at Elevated Locations
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726
Errors and significant figures
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25
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1K
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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827
Can terminal velocity be determined from the information given?
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7
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721
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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710
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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682
Tension in a string connecting two blocks having equal and opposite velocities
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21
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1K
Physics Problem on Tension in Water
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19
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789
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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787
Will Y-Direction Motion Cease with X-Direction Acceleration Only?
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2K
Projectile problem: A block released from a balloon
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5
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656
Help on reflection of a wave from fixed end without transmission
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2
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1K
Electric field due to arc shaped thin rod
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13
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772
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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777
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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766
Problem with pulleys - two fixed and one movable
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1K
Is this an oversimplification? (treating a lens as a set of prisms)
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Change in Displacement Formulation
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803
Definition of pound force
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707
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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925