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.
Rigid body dynamics: A rod with two masses rotates down from a horizontal starting position
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Equivalent Resistance of Cube of Resistors: A to B
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5
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3K
This question caused a debate in the class: EMF from a changing magnetic field
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7
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1K
Net force between two conducting strips
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6
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1K
Is My Answer Correct for Calculating Average Current on a Ring?
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8
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944
Correct Setup for Finite Difference to Calculate Quantum Tunneling
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2
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1K
Confused about interefence patterns
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16
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Magnetization of a paramagnetic sphere
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11
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2K
Help with a Physics car project please
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2
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795
Solving projectile motion problems using Lagrangian mechanics
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9
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2K
What distance will be covered before coming to stop?
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12
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1K
Motor rotating at normal speed and then prevented from rotating
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2
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619
Force between charged particle and conducting cylinder
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10
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Tension in a deformed cylindrical bag on a surface
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Finding the shape of a hanging rope
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3
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876
Two launches ferrying between two landing stations along a river
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23
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Calculate how fast the car was travelling when brakes were applied
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1
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844
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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Issues with SLS Model for Rubber and Foam Compression Tests
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5
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920
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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What Force must be exerted on the trolley for constant speed?
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1
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517
Two objects joined by a rectilinear cable rotating
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8
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1K
Oscillation of system of three charges
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8
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1K
Bees and Trains: A distance problem
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19
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2K
Extension of spring in a system with two pistons
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16
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934
Classical Mechanics: Rocket Propulsion Calculation
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10
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2K
Missing negative sign in my textbook's answer?
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1
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721
Spaceship, Earth and proton problem in special relativity
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12
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1K
Quantum - Postulate of getting specific momentum p = |A_p|^2
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7
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975
Effect of temperature on surface tension
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2
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2K
Need maximum weight on an extension machine
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2
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862
Finding a formula for displacement of a mass on a spring using v.
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2
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849
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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940
Shape of equipotential surface in 3d
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5
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976
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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648
Two Trains and a Bee: Distance Question
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3
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922
A falling resistive disk in uniform magnetic field
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17
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2K
How can I maximise the exit velocity of an object catapulted up?
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4
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808
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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774
Horizontal component of the Coriolis force
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2
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885
Flux linking (and de-linking?)
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6
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1K
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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Forces involved in principle of virtual work
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2
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872
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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855
Electric field external to Conducting Hollow Sphere with charge inside
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23
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4K
Lorentz force and induced electric field
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6
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Please explain this suggested solution for the field inside a charged hollow sphere
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17
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Deriving a formula for KE (rolling + projection)
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2
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759
Simple Static 3-Particle Model
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2
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573
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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How to calculate the force exerted by the "tendon" on the "tibia" bone?
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4
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Range of an object launched on a downward hill
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12
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Resistance of three-dimensional objects
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How to understand typo in MIT OCW chapter on Poynting vector?
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4
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900
What does having 3d symmetry 2d symmetry and 1d symmetry mean?
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Spaceship length contraction problem
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4
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Measuring Acceleration on a Bike using Phyphox
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How does an eddy current brake work exactly?
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2
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what the relation between the amplitude magnitude and mass at resonance?
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5
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Ion moving through electric potential difference and magnetic field
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Direction of travel of a plane wave given direction of electric field
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How is centripetal force involved here? (charged mass sliding down a conducting hemisphere)
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Mathematical representation of a pulse on a rope
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9
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Is This a Series or Parallel Circuit?
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13
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Planet moving in elliptical orbit around a star
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13
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Why can we add impedances in series?
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4
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How to understand the direction of tension in a charged closed ring?
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11
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Internal energy of a gas and kinetic energy, "typical velocity"
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5
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948
Damped harmonic oscillation
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3
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Question on mirror and lens combinations
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2
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Find the direction and the magnitude of Frictional force
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3
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935
Shortest distance along the shore and into the lake
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6
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Magnitude of magnetic field at different points near a capacitor.
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6
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How to find voltage across capacitor in RLC circuit?
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3
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Vertical circular motion
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8
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Can Geiger Counter Ticks be converted into particle/wave counts?
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12
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Kinematics: Acceleration of a figure skater changing direction
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16
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Find the electric field at a point in 3 dimensional space
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2
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The electric potential inside a conducting sphere with charge Q
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11
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X and Y coordinates of an oscillating object on a spring.
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3
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Simultaneous events separated by distance and time
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5
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Finding speed of spaceship traveling to star ##a## light years away
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8
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850
Stationary observer meaning in relativity problem
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14
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Particle moving at speed ##bc## relative to laboratory frame
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20
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925
Why Doesn't Time Dilation Affect Pendulum Observations on a Moving Train?
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8
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Two cyclists ride between a pair of towns with and against the wind
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17
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Universal gravitation’s problem -- Balancing gravitational forces from 2 masses
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3
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605
Prove that the field due to a circular arc is same as its bounded tangent at the centre of curvature
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Experimenting whether the diameter of a pot affects boiling time for water
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15
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How to obtain amplitude of current in parallel RLC circuit?
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3
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892