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 to calculate the velocity of water streaming into the boat?
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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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814
Stress on a spaghetti rod balanced from its middle
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6
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How to calculate the degrees of freedom of a simple multi-body system?
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5
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865
What Force must be exerted on the trolley for constant speed?
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1
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474
Two objects joined by a rectilinear cable rotating
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8
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943
Oscillation of system of three charges
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8
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932
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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824
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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674
Spaceship, Earth and proton problem in special relativity
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12
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899
Quantum - Postulate of getting specific momentum p = |A_p|^2
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7
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864
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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740
Finding a formula for displacement of a mass on a spring using v.
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2
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741
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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827
Shape of equipotential surface in 3d
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5
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850
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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595
Two Trains and a Bee: Distance Question
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3
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831
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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761
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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684
Horizontal component of the Coriolis force
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2
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742
Flux linking (and de-linking?)
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6
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931
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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935
Forces involved in principle of virtual work
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2
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770
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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766
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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676
Simple Static 3-Particle Model
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2
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506
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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941
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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994
Resistance of three-dimensional objects
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10
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945
How to understand typo in MIT OCW chapter on Poynting vector?
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4
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792
What does having 3d symmetry 2d symmetry and 1d symmetry mean?
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2
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2K
Spaceship length contraction problem
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4
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526
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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935
Ion moving through electric potential difference and magnetic field
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8
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1K
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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666
Is This a Series or Parallel Circuit?
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Planet moving in elliptical orbit around a star
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13
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874
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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784
Internal energy of a gas and kinetic energy, "typical velocity"
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5
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842
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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Find the direction and the magnitude of Frictional force
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3
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826
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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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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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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677
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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737
Stationary observer meaning in relativity problem
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14
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694
Particle moving at speed ##bc## relative to laboratory frame
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20
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831
Why Doesn't Time Dilation Affect Pendulum Observations on a Moving Train?
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8
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766
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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557
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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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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788
Uniform Motion in 2D - A man chasing a bus
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20
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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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705
Self-inductance of LC circuit given rate of capacitor discharge.
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6
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952
Formula for the average EMF of generator
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6
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881
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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872
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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882
Confused about how forces in a pulley balance
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6
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976
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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908
IPHO classical mechanics: A mass falls on an exoplanet
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2
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890
Electric field & force due to charged insulating hemispherical shells
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12
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2K
Induction heat flux density induced by wire in a slab
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0
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895
Non-Uniform Magnetic Field Calculations
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9
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2K
Power Radiated From a Copper Cube
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3
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882