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.
How far do acorns drift in the wind?
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832
Rpm and power for this electric motor, gearbox and pulley system
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Normalising the wavefunction - two answers
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Relationship between linear velocity and angular velocity
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Is the Solution for Rotation of Spherical Mirrors Incorrect?
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16
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How can I determine the instant the block overcomes static friction?
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General question about the definition of moment of force (Torque)
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What's the pressure long before the fluid exits a pipe?
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13
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Oil enters a flexible bend in a pipe -- calculate the force needed to hold the bend in place
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12
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Induced charge on a conducting sphere sliced by a plane
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2
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Time it Takes for a Transverse Pulse to Travel a Distance "L" Up a Cable Against Gravity?
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Question about the current components inside the Corbino disk
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11
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2K
Pressure just before the exit hole in a draining tank
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7
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2K
Find the coefficient of friction between block and surface
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4
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787
Block and wedge problem -- Where am I going wrong?
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7
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1K
Potential Energy Problem: Pulling a Chain up onto a Table
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3
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What is the maximum length of the spring?
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4
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968
Need some confirmation regarding induced currents
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1
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891
LASER Applications help please
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4
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902
Which movement has the greatest net work done?
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3
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817
Calculate the area of this pond with functions given for the perimeter
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2
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1K
Why are the electrostatic field lines normal to a charged conductor?
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10
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Electric field of a sphere and a shell
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16
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1K
Rigid body dynamics: A rod with two masses rotates down from a horizontal starting position
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21
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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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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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Correct Setup for Finite Difference to Calculate Quantum Tunneling
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2
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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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870
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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685
Force between charged particle and conducting cylinder
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10
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1K
Tension in a deformed cylindrical bag on a surface
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18
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2K
Finding the shape of a hanging rope
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3
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951
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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923
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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Issues with SLS Model for Rubber and Foam Compression Tests
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5
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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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550
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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Bees and Trains: A distance problem
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19
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Extension of spring in a system with two pistons
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16
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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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774
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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Effect of temperature on surface tension
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Need maximum weight on an extension machine
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960
Finding a formula for displacement of a mass on a spring using v.
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2
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Correct Derivation of the Adiabatic Condition? (PV Diagram)
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An "x" from nowhere, mistake by textbook? (induced voltages)
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Shape of equipotential surface in 3d
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A problem in this photoelectric effect experiment
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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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712
Two Trains and a Bee: Distance Question
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3
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1K
A falling resistive disk in uniform magnetic field
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2K
How can I maximise the exit velocity of an object catapulted up?
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Which block reaches the wall faster?
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Is this a mistake in my textbook's answer about induced voltage question?
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Horizontal component of the Coriolis force
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Flux linking (and de-linking?)
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6
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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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949
Absolute motion analysis of pulley-spring system
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10
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Lagrangian for a rod pivoting at the end of a clock hand
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5
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924
Electric field external to Conducting Hollow Sphere with charge inside
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23
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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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Deriving a formula for KE (rolling + projection)
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836
Simple Static 3-Particle Model
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2
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627
I am confused about air density/drag
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12
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2K
Problem about non-inertial reference frame
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8
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1K
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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What does having 3d symmetry 2d symmetry and 1d symmetry mean?
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2
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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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2
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How does an eddy current brake work exactly?
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what the relation between the amplitude magnitude and mass at resonance?
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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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859
Is This a Series or Parallel Circuit?
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Planet moving in elliptical orbit around a star
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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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