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.
Tension in a deformed cylindrical bag on a surface
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2K
Finding the shape of a hanging rope
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3
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803
Two launches ferrying between two landing stations along a river
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23
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2K
Calculate how fast the car was travelling when brakes were applied
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1
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768
Contact Mechanics: Deformation of a ball on a surface
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3
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1K
How to calculate the velocity of water streaming into the boat?
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19
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1K
Difficulty Understanding 'Drag Crisis' (transitionary period from laminar to turbulent flow)
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1
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1K
Issues with SLS Model for Rubber and Foam Compression Tests
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5
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835
Stress on a spaghetti rod balanced from its middle
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6
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1K
How to calculate the degrees of freedom of a simple multi-body system?
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5
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912
What Force must be exerted on the trolley for constant speed?
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1
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493
Two objects joined by a rectilinear cable rotating
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8
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976
Oscillation of system of three charges
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8
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968
Bees and Trains: A distance problem
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19
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1K
Extension of spring in a system with two pistons
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16
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851
Classical Mechanics: Rocket Propulsion Calculation
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10
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1K
Missing negative sign in my textbook's answer?
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1
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694
Spaceship, Earth and proton problem in special relativity
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12
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929
Quantum - Postulate of getting specific momentum p = |A_p|^2
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7
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891
Effect of temperature on surface tension
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2
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1K
Need maximum weight on an extension machine
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2
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768
Finding a formula for displacement of a mass on a spring using v.
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2
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768
Correct Derivation of the Adiabatic Condition? (PV Diagram)
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4
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1K
An "x" from nowhere, mistake by textbook? (induced voltages)
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2
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855
Shape of equipotential surface in 3d
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5
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877
A problem in this photoelectric effect experiment
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8
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1K
Problem in understanding angular momentum of a rigid body
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10
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2K
Shape of Slinky being twirled in 0 gravity
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4
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609
Two Trains and a Bee: Distance Question
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3
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850
A falling resistive disk in uniform magnetic field
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17
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1K
How can I maximise the exit velocity of an object catapulted up?
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4
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777
Which block reaches the wall faster?
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2
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1K
Is this a mistake in my textbook's answer about induced voltage question?
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1
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708
Horizontal component of the Coriolis force
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2
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784
Flux linking (and de-linking?)
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6
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970
Force on a rotating wheel/disc
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25
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2K
Magnus Effect Equations and Mechanics
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12
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968
Forces involved in principle of virtual work
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2
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795
Absolute motion analysis of pulley-spring system
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10
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1K
Lagrangian for a rod pivoting at the end of a clock hand
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5
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784
Electric field external to Conducting Hollow Sphere with charge inside
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23
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3K
Lorentz force and induced electric field
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6
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1K
Please explain this suggested solution for the field inside a charged hollow sphere
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17
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1K
Deriving a formula for KE (rolling + projection)
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2
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706
Simple Static 3-Particle Model
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2
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535
I am confused about air density/drag
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12
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1K
Problem about non-inertial reference frame
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8
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974
How to calculate the force exerted by the "tendon" on the "tibia" bone?
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4
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1K
Range of an object launched on a downward hill
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12
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1K
Resistance of three-dimensional objects
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10
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1K
How to understand typo in MIT OCW chapter on Poynting vector?
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4
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821
What does having 3d symmetry 2d symmetry and 1d symmetry mean?
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2
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36
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2K
Spaceship length contraction problem
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4
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546
Measuring Acceleration on a Bike using Phyphox
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2
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33
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2K
How does an eddy current brake work exactly?
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2
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2K
what the relation between the amplitude magnitude and mass at resonance?
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5
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964
Ion moving through electric potential difference and magnetic field
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8
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2K
Direction of travel of a plane wave given direction of electric field
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8
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1K
How is centripetal force involved here? (charged mass sliding down a conducting hemisphere)
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2
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31
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1K
Mathematical representation of a pulse on a rope
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9
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706
Is This a Series or Parallel Circuit?
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13
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1K
Planet moving in elliptical orbit around a star
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13
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903
Why can we add impedances in series?
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4
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2K
How to understand the direction of tension in a charged closed ring?
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11
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824
Internal energy of a gas and kinetic energy, "typical velocity"
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5
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874
Damped harmonic oscillation
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3
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3K
Question on mirror and lens combinations
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2
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3K
Find the direction and the magnitude of Frictional force
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3
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849
Shortest distance along the shore and into the lake
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6
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1K
Magnitude of magnetic field at different points near a capacitor.
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6
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1K
How to find voltage across capacitor in RLC circuit?
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3
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2K
Vertical circular motion
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8
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2K
Can Geiger Counter Ticks be converted into particle/wave counts?
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12
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2K
Kinematics: Acceleration of a figure skater changing direction
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16
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1K
Find the electric field at a point in 3 dimensional space
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2
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50
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The electric potential inside a conducting sphere with charge Q
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11
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2K
X and Y coordinates of an oscillating object on a spring.
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3
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705
Simultaneous events separated by distance and time
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5
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697
Finding speed of spaceship traveling to star ##a## light years away
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8
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770
Stationary observer meaning in relativity problem
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14
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717
Particle moving at speed ##bc## relative to laboratory frame
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20
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852
Why Doesn't Time Dilation Affect Pendulum Observations on a Moving Train?
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8
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808
Two cyclists ride between a pair of towns with and against the wind
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17
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1K
Universal gravitation’s problem -- Balancing gravitational forces from 2 masses
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3
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573
Prove that the field due to a circular arc is same as its bounded tangent at the centre of curvature
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23
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1K
Experimenting whether the diameter of a pot affects boiling time for water
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15
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2K
How to obtain amplitude of current in parallel RLC circuit?
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3
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812
Uniform Motion in 2D - A man chasing a bus
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20
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1K
Understanding the generic nature of linearity in Physics
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2
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1K
Ap physics 1 velocity center of mass question
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4
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732
Self-inductance of LC circuit given rate of capacitor discharge.
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6
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984
Formula for the average EMF of generator
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6
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925
Calculation of current in driven series RLC circuit
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8
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2K
Magnetic energy density, self-inductance of coaxial cylindrical shells
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10
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1K
Test question: What is true for a mechanical impact?
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7
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1K
Find work given two conservative forces and a nonconservative force
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9
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897
Two candles making shadows of one another on opposite walls
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3
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1K
Atmospheric pressure and water pressure - Boyle's law
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6
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919
Confused about how forces in a pulley balance
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6
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1K
A vertical U tube rotates about the vertical axis -- Find omega to cause this height offset
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15
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933