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.
Poiseuille law and friction force help
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683
Reversible, adiabatic expansion - Entropy Change
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5
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831
Linear momentum but quadratic kinetic energy?
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4
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592
Are there two downward forces acting on the pivot of the rotating rod?
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3
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4K
Thermodynamics: Violating Clausius => Violating Kelvin
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10
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904
The motion of a skateboarder along and above a ramp
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2
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700
Deriving the particle's motion using numerical integration
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5
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827
Circular motion, coin on a rotating disk
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2
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880
Angular velocity- A toy train rolls around a horizontal track
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8
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957
Energy stored in the steady state circuit
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7
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858
Solving Kinematics Problem: V_o & Max Height
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7
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2K
Additivity of thermodynamic potentials?
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1
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546
Two Forces Acting Simultaneously
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6
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875
Electric field of a finite linear distribution of charge
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18
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1K
Conversion factor when converting from SI to natural units
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1
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1K
How do I calculate forces in a truss cross section?
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2
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749
Clausius' Theorem and Entropy
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8
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908
Circular argument? Justification of equipotential points
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16
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997
Is My Calculation of Work Along a Defined Curve Correct?
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4
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778
Thermodynamics of a Heat Engine - (First/Second Law)
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2
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675
Finding the distance of a peg so that a pendulum can circle around it
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2
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1K
Energy of springs connected in series and parallel
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13
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1K
The specific work done on an ideal gas during an adiabatic process in a piston-cylinder system
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13
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1K
Relative electrical energy consumption for different light bulb color temperatures
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3
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729
Frequency of Reflected light in special relativity
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1
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613
Confusion about work done by a gas - Thermodynamics
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15
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1K
Thermal exchange between warm object and ideal gas
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2
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924
Thermodynamics: Two gases in a container
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1
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723
Show that the radius of the exoplanet is about 1/2 of Earth’s radius
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2
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910
Total Energy vs Average Energy (Thermo)
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11
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1K
Electric flux from line charge through plane strip
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7
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6K
Investigation into electric guitar pickups
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4
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3K
Electric field created by point charges
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6
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978
Confusion about applying Faraday's law to a circuit
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3
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1K
What's the energy stored in a parallel plate capacitor?
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14
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2K
Mass Pulley and torque -- Confusion in this Atwood machine problem
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11
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1K
Derive Gravitational Force and Field between two identical rods
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1
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532
A particle slides down a non-fixed hemisphere
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3
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902
Two spring-coupled masses in an electric field (one of the masses is charged)
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1
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1K
Find the equivalent resistance of this circuit
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2
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31
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4K
How Do I Draw a Decay Scheme in Radiochemistry?
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1
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801
Determine the type of measurement by classification
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2
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605
Rope tension problem: Mass hanging from a rope tied at an angle
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21
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1K
Potential in spherical shells
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2
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852
Internal Resistance Affect the Balancing Length in a Potentiometer?
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12
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1K
Robot starts to overturn when reaching to pick up a load
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2
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660
Distance rolled of sphere vs cylinder with same m, r, and v
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5
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902
Determine energy required to stop rolling mass
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10
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816
Required force for sphere start rolling
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2
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831
Conservation of String Exercise
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5
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784
Reflection and Transmission of String Waves
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8
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1K
Tension in a rope hanging between 2 trees
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24
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1K
How do I calculate the Tension in a rope going over a smooth pulley?
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19
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1K
Liquid rocket engine excercise
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1K
Connecting a number of EMF sources in a circle to form a circuit
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1K
Friction force on a ball falling through a body of water
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9
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1K
Is the Trigonometric Analysis of Conveyor Belt Forces Correct?
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732
Gradient and Divergence in spherical coordinates
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1K
Making a vehicle go straight on carpet
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8
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796
A Braking System with Spikes for Cars
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4
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832
Torque on a Circular Current Loop under a Misaligned Magnetic Field
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1
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1K
Rod with Current on Rails in Magnetic Field
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12
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2K
A problem in applying Kirchhoff's Voltage Law
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1
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918
Body attached to a block by a spring, shaped like an inclined plane
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1
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1K
Ball revolving around a massive disc and a cube placed at centre
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1
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877
A cylinder rotating on a plane with friction and then moving across a frictionless plane to a collision
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1
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932
Finding the intermediate height of a ball in terms of its maximum height
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3
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915
Time taken for a planet to collide with the Sun
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10
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959
Why is there no current flow in the middle branch? (Circuits problem)
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988
Temperature dependence of resistance
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6
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1K
Find the density of surface charges at the boundary of two conductors with different resistivities
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6
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Trying to tie two runners of different speeds over a race
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2
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2K
Can Energy Conservation Solve the Angular Velocity Problem?
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6
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899
How do we represent a triangle wave for input voltage in this circuit?
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3
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855
Why is Radial Acceleration Ignored for a Rotating Board?
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Concept of different accelerations on rotations of rigid bodies
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10
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999
Relativistic Decay and Separation Between Moving Nuclei A and B
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1
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684
Looking for observed rotation periods of various Foucault pendulums at different latitudes
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6
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997
Textbook 'The Physics of Waves': Varying Force Amplitude
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3
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1K
Expression for magnitude of the constant friction force
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7
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1K
Energy conservation equation to find equation for final velocity
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4
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1K
How Many Eggs to Turn a 40lb Flywheel in a Vacuum?
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10
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982
Effect of rim width on a frisbee's stability and range
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8
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804
Rocket + Connected Body Dynamics problem
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2
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47
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3K
Quantum Mechanics Boundary conditions
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3
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826
Uncertainty in particle position
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3
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637
Reflection probability in Quantum Mechanics
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2
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672
Why is the direction of kinetic/static friction up a ramp?
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7
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1K
Heated gas pushing a mercury column out of a cylinder
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10
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968
Temperature of two subsystems at equilibrium
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7
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1K
Doppler Effect Question: Flying Bat Echolocating a Mosquito
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12
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Final momentum of box with reflective interior hit by ideal laser
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4
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1K
Explain why applying different forces to objects of different masses result in different accelerations
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9
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Incandescent Bulb - suitable approximation for voltage-current curve
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2
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1K
Diophantine equations and physics
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1
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878
Underground cables faulty point detected
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24
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1K
Motion of an electron inside the cavity of a charged sphere
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1K
How to solve this driven RLC circuit?
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13
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1K
Electrostatics and current problem with 3 metallic balls
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29
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1K
How to set up this problem with driven torsional oscillator?
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1K