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.
Momentum: instantaneous or average?
  • paulb203
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Derivation process of Selection Rule of hydrogenic atom
  • smjchris
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A question about the perpendicular vector
  • student120
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Trouble understanding frames in relativity
  • approximatelysphere
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4
Why does the PE of particles during steam condensation decrease?
  • shirozack
  • · Replies 14 ·
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14
Torque on a sign hung by a hinge
  • Physical_Fire
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3
Acceleration of a ball at its max height after being thrown upwards
  • shirozack
  • · Replies 11 ·
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11
Oscillation of fluids in a U tube
  • Rob2024
  • · Replies 17 ·
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17
A microwave oven of mass 13.0kg is pushed a distance 8.80m up a ramp
  • nouvelague
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Free-body diagram: Spring-loaded cylinder sliding on a metal rod
  • ymnoklan
  • · Replies 34 ·
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A 2.8-kg block slides over the smooth icy hill -- Find the minimum speed to clear the pit
  • nouvelague
  • · Replies 1 ·
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1
A household fridge removes heat, determine power the fridge draws
  • joejoe121
  • · Replies 8 ·
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8
Find h in the problem involving a stone thrown upwards
  • chwala
  • · Replies 5 ·
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5
Voltage-resistance graph for this circuit with a variable resistance
  • shirozack
  • · Replies 4 ·
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4
Work done by a balloon that is rising
  • shirozack
  • · Replies 8 ·
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8
Coefficient of friction of a sandwiched body
  • vamsi
  • · Replies 15 ·
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15
Kinematics, is this a poorly worded question?
  • shirozack
  • · Replies 7 ·
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7
Efficiency of Stirling Cycle - Is it the same as the Carnot Engine?
  • laser1
  • · Replies 14 ·
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14
Circular motion and moment of inertia - circle loop
  • CRJ
  • · Replies 29 ·
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29
Pressure question: Weight of a car calculated from tyre contact patch area
  • shirozack
  • · Replies 3 ·
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3
Ionic thruster high school science project
  • lucashuizat777
  • · Replies 2 ·
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2
Rolling without Slipping Demo
  • erobz
  • · Replies 8 ·
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8
RCL series circuit analysis: Damping Constant
  • hoangpham4696
  • · Replies 1 ·
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1
Electric field of a charged disc with a small circle cut out of it
  • kirito
  • · Replies 9 ·
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9
Block tied to a fixed string on an accelerating wedge
  • Null_Void
  • · Replies 37 ·
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37
Use of imaginary charge vs Gauss' law
  • kirito
  • · Replies 12 ·
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12
Relation between the velocity vector and the acceleration vector of an object
  • Clockclocle
  • · Replies 1 ·
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1
Issue deriving the third law of thermodynamics
  • laser1
  • · Replies 11 ·
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11
First Law of Thermo: Audience body heat warming a concert hall
  • Mineral
  • · Replies 25 ·
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25
Rotational Dynamics problem with instantaneous frame of reference
  • YK0001
  • · Replies 6 ·
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6
Distribution of Energy when work is done on a system of 2 masses connected by a spring
  • MattGeo
  • · Replies 17 ·
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17
What Does -∂V/∂x Represent in Newton's Law?
  • rb120134
  • · Replies 2 ·
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2
How to approach this question using SUVAT equations?
  • Physical_Fire
  • · Replies 8 ·
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8
Confused about kinematic equations
  • John3509
  • · Replies 20 ·
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20
What is the relationship between tire size and pressure changes?
  • songoku
  • · Replies 13 ·
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13
Moment of Inertia of Solid Sphere - Proof
  • Math_Maniac
  • · Replies 3 ·
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3
Reading of Ammeter for this circuit with Voltage Controlled Resistors
  • Bling Fizikst
  • · Replies 9 ·
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9
Relation between Friction, Velocity, and Acceleration
  • steff-23
  • · Replies 16 ·
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16
Is this statement acceptable? (time derivative of a rotating vector)
  • Clockclocle
  • · Replies 4 ·
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4
Entropy Change For Van Der Waals Gas
  • laser1
  • · Replies 5 ·
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5
Maximum Power dissipated at load resistor
  • Bling Fizikst
  • · Replies 3 ·
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3
Poiseuille law and friction force help
  • notorious
  • · Replies 5 ·
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5
Reversible, adiabatic expansion - Entropy Change
  • laser1
  • · Replies 5 ·
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5
Linear momentum but quadratic kinetic energy?
  • Rick28
  • · Replies 4 ·
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4
Are there two downward forces acting on the pivot of the rotating rod?
  • ymnoklan
  • · Replies 67 ·
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Thermodynamics: Violating Clausius => Violating Kelvin
  • laser1
  • · Replies 10 ·
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10
The motion of a skateboarder along and above a ramp
  • StrugglingStudent123
  • · Replies 2 ·
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2
Deriving the particle's motion using numerical integration
  • theblazierbroom
  • · Replies 5 ·
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5
Circular motion, coin on a rotating disk
  • fallingforfandoms
  • · Replies 2 ·
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2
Angular velocity- A toy train rolls around a horizontal track
  • Ediscoverlyf
  • · Replies 8 ·
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8
Energy stored in the steady state circuit
  • hoangpham4696
  • · Replies 7 ·
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7
Solving Kinematics Problem: V_o & Max Height
  • DeltaForce
  • · Replies 7 ·
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7
Additivity of thermodynamic potentials?
  • heyhey281
  • · Replies 1 ·
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Two Forces Acting Simultaneously
  • BurpHa
  • · Replies 6 ·
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6
Electric field of a finite linear distribution of charge
  • darioslc
  • · Replies 18 ·
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Conversion factor when converting from SI to natural units
  • Dex_
  • · Replies 1 ·
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How do I calculate forces in a truss cross section?
  • carlcla
  • · Replies 2 ·
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Clausius' Theorem and Entropy
  • laser1
  • · Replies 8 ·
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8
Circular argument? Justification of equipotential points
  • tellmesomething
  • · Replies 16 ·
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16
Is My Calculation of Work Along a Defined Curve Correct?
  • Morle
  • · Replies 4 ·
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4
Thermodynamics of a Heat Engine - (First/Second Law)
  • laser1
  • · Replies 2 ·
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Finding the distance of a peg so that a pendulum can circle around it
  • SelzerRS
  • · Replies 2 ·
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Energy of springs connected in series and parallel
  • songoku
  • · Replies 13 ·
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13
The specific work done on an ideal gas during an adiabatic process in a piston-cylinder system
  • joejoe121
  • · Replies 13 ·
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13
Relative electrical energy consumption for different light bulb color temperatures
  • songoku
  • · Replies 3 ·
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3
Frequency of Reflected light in special relativity
  • mancity
  • · Replies 1 ·
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Confusion about work done by a gas - Thermodynamics
  • laser1
  • · Replies 15 ·
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15
Thermal exchange between warm object and ideal gas
  • JayBi
  • · Replies 2 ·
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2
Thermodynamics: Two gases in a container
  • heyhey281
  • · Replies 1 ·
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1
Show that the radius of the exoplanet is about 1/2 of Earth’s radius
  • hraghav
  • · Replies 2 ·
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Total Energy vs Average Energy (Thermo)
  • laser1
  • · Replies 11 ·
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11
Electric flux from line charge through plane strip
  • Natique
  • · Replies 7 ·
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7
Investigation into electric guitar pickups
  • singismund
  • · Replies 4 ·
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4
Electric field created by point charges
  • darioslc
  • · Replies 6 ·
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6
Confusion about applying Faraday's law to a circuit
  • eyeweyew
  • · Replies 3 ·
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3
What's the energy stored in a parallel plate capacitor?
  • NTesla
  • · Replies 14 ·
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14
Mass Pulley and torque -- Confusion in this Atwood machine problem
  • mancity
  • · Replies 11 ·
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11
Derive Gravitational Force and Field between two identical rods
  • RIJU101
  • · Replies 1 ·
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A particle slides down a non-fixed hemisphere
  • Jason Ko
  • · Replies 3 ·
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3
Two spring-coupled masses in an electric field (one of the masses is charged)
  • kekpillangok
  • · Replies 1 ·
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Find the equivalent resistance of this circuit
  • zenterix
  • · Replies 31 ·
2
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How Do I Draw a Decay Scheme in Radiochemistry?
  • Kacey679
  • · Replies 1 ·
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Determine the type of measurement by classification
  • Miristeri
  • · Replies 2 ·
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Rope tension problem: Mass hanging from a rope tied at an angle
  • litelboi
  • · Replies 21 ·
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Potential in spherical shells
  • per persson
  • · Replies 2 ·
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2
Internal Resistance Affect the Balancing Length in a Potentiometer?
  • tellmesomething
  • · Replies 12 ·
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12
Robot starts to overturn when reaching to pick up a load
  • crystallizedyogurt
  • · Replies 2 ·
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2
Distance rolled of sphere vs cylinder with same m, r, and v
  • I_Try_Math
  • · Replies 5 ·
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Determine energy required to stop rolling mass
  • I_Try_Math
  • · Replies 10 ·
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Required force for sphere start rolling
  • eyeweyew
  • · Replies 2 ·
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Conservation of String Exercise
  • mancity
  • · Replies 5 ·
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Reflection and Transmission of String Waves
  • Ark236
  • · Replies 8 ·
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8
Tension in a rope hanging between 2 trees
  • Manish_529
  • · Replies 24 ·
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24
How do I calculate the Tension in a rope going over a smooth pulley?
  • carlcla
  • · Replies 19 ·
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19
Liquid rocket engine excercise
  • mirko9670
  • · Replies 1 ·
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1
Connecting a number of EMF sources in a circle to form a circuit
  • tellmesomething
  • · Replies 9 ·
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9
Friction force on a ball falling through a body of water
  • NikolasLund
  • · Replies 9 ·
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9
Is the Trigonometric Analysis of Conveyor Belt Forces Correct?
  • Aariz
  • · Replies 6 ·
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Gradient and Divergence in spherical coordinates
  • physicss
  • · Replies 3 ·
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Making a vehicle go straight on carpet
  • Kiblur
  • · Replies 8 ·
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8