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.
Blowing Into Your Own Sail
  • rosedog09
  • · Replies 25 ·
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25
Drag Forces and Terminal Velocity
  • rosedog09
  • · Replies 8 ·
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8
Why the need to be careful opening a switch on this RL circuit?
  • zenterix
  • · Replies 6 ·
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6
Ratio of frequency between heavier and lighter part of composite cord
  • songoku
  • · Replies 4 ·
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4
Need help, to help, a friend with their HW (High School)
  • Owen Ploe
  • · Replies 6 ·
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6
Current in circular wire surrounding infinite solenoid in a circuit
  • zenterix
  • · Replies 7 ·
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7
Determining the sound level of a leaf blower
  • barryj
  • · Replies 1 ·
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1
Average velocity in different coordinate systems
  • Manish_529
  • · Replies 27 ·
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27
GRIN Lens - Gradient Coefficient Expression
  • Schreiber__
  • · Replies 5 ·
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5
Help please on essay about star formation
  • perlastudies
  • · Replies 5 ·
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5
Torque on a Pivot Point With Multiple Forces and Different Directions
  • rosedog09
  • · Replies 6 ·
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6
Variation of escape velocity with equal surface gravity
  • sachin
  • · Replies 7 ·
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7
How to calculate gamma ray energies following beta decay?
  • oleosquarewave
  • · Replies 12 ·
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12
Minimum force to tip the bin over
  • sdfsfasdfasf
  • · Replies 7 ·
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7
Depth of a basketball floating on water
  • brotherbobby
  • · Replies 9 ·
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9
Keplerian Telescope and real image
  • xchen2004
  • · Replies 7 ·
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7
Concept about photoelectric effect
  • songoku
  • · Replies 17 ·
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17
Dynamic system of self balancing robot
  • JVDC
  • · Replies 4 ·
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4
Max inversion temperature for a gas (Dieterici’s equation of state)
  • jonny997
  • · Replies 4 ·
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4
Closed cycle of an ideal gas
  • imdesperate
  • · Replies 3 ·
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3
Why is the tension in a massive cable always tangent to its portion?
  • Karol
  • · Replies 5 ·
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5
Statistical mechanics: particles in magnetic fields
  • MatinSAR
  • · Replies 2 ·
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2
Calculating Magnetic Field at Point P for Perpendicular Current-Carrying Wires
  • Kartofen69420
  • · Replies 2 ·
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2
Calculation of Ramp Jump Distance Using Projectile Motion Formulas?
  • Amaretto
  • · Replies 12 ·
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12
Help with designing a power generating system
  • Simonglo
  • · Replies 3 ·
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3
Max Impulse on a pendulum
  • PakBosMuda
  • · Replies 1 ·
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1
Angle that makes kinetic and potential energy of simple pendulum equal
  • DrBanana
  • · Replies 2 ·
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2
Introduce a battery to an LR circuit
  • laser
  • · Replies 16 ·
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16
Planar pendulum with rotating pivot
  • member 731016
  • · Replies 7 ·
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7
What Are the Assumptions and Calculations for Sheet of Charge Theory?
  • Iamconfused123
  • · Replies 1 ·
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1
Cables, pulleys, 2 weights
  • DylanMurfly
  • · Replies 4 ·
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4
Balmer series experiment
  • MatinSAR
  • · Replies 2 ·
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2
Spherical pendulum confusion [Issue resolved]
  • member 731016
  • · Replies 2 ·
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2
Launch service between two stations along a flowing river
  • brotherbobby
  • · Replies 21 ·
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21
Book plots position & force on the same graph, still gets right answer
  • DrBanana
  • · Replies 8 ·
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8
Why is source force + electrostatic force = 0 inside battery?
  • zenterix
  • · Replies 10 ·
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10
Relativistic motion and length contraction
  • the farmer
  • · Replies 44 ·
2
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44
Circular motion doubt: Angular velocity vector for general planar motion about a point in the plane
  • tellmesomething
  • · Replies 6 ·
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6
Critical frequency of Faraday Waves?
  • Anjish
  • · Replies 6 ·
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6
Find starting velocity from golfer launching ball
  • bremenfallturm
  • · Replies 7 ·
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7
Why is the electric field inside a conducting hollow/filled sphere zero?
  • aryan kumar pandey
  • · Replies 2 ·
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2
Slope of N - t graph of radioactive decay
  • songoku
  • · Replies 2 ·
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2
Question about Feynman diagram showing annihilation
  • songoku
  • · Replies 4 ·
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4
Coupled oscillator question
  • member 731016
  • · Replies 2 ·
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2
Tension in a Two-Crate System on a Frictionless Surface
  • babaypenguin88
  • · Replies 7 ·
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7
Forces at play in a pendulum (conceptual doubt)
  • tellmesomething
  • · Replies 7 ·
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7
How do I fix the signs in Faraday's Law in RL Circuit?
  • zenterix
  • · Replies 5 ·
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5
Resistivity calculation from two-probe resistance measurement of sheet
  • no_einstein
  • · Replies 2 ·
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2
Simple pendulum with moving support
  • member 731016
  • · Replies 4 ·
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4
Change in the unit vectors
  • Manish_529
  • · Replies 10 ·
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10
Coupled pendulum-spring system
  • member 731016
  • · Replies 3 ·
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3
Field transformations in the z-direction
  • milkism
  • · Replies 7 ·
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7
Pendulum attached to a rotating vertical disk
  • member 731016
  • · Replies 2 ·
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2
The value of the spring constant k that I calculate seems too high
  • dannolul
  • · Replies 11 ·
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11
Understanding the math of definition of electromotive force
  • zenterix
  • · Replies 1 ·
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1
Length of string in a standing wave
  • laser
  • · Replies 19 ·
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19
Field due to an electric dipole (Halliday & Resnick, Ch. 27 problem 23)
  • Ben2
  • · Replies 3 ·
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3
Understanding a very simply RL circuit
  • zenterix
  • · Replies 1 ·
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1
Small oscillations of a simple pendulum placed on a moving block
  • MatinSAR
  • · Replies 73 ·
3
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73
Lab Exercise: Measuring "g" using Conservation of Energy
  • Envy9268
  • · Replies 12 ·
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12
Kinematics problem from a competition: Will the 2 sliding boxes collide?
  • Jim Alexandridis
  • · Replies 6 ·
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6
Flashing light beacon from Earth reaching spaceship moving away at 0.75c
  • neelbansal123
  • · Replies 5 ·
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5
Rolling Sphere On Incline
  • Randomized10
  • · Replies 1 ·
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1
Block sliding on a semicircular track with friction
  • zuzelle
  • · Replies 10 ·
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10
The maximum reversible work in thermodynamics (2)
  • tracker890 Source h
  • · Replies 1 ·
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1
Formula derivation connecting vertical water flowrate & horizontal distance moved by a suspended sphere
  • printereater
  • · Replies 207 ·
7
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207
Impulse and momentum / work-energy
  • GoonP
  • · Replies 5 ·
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5
The maximum reversible work in thermodynamics
  • tracker890 Source h
  • · Replies 22 ·
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22
Do you graph the energy levels of a ##1s^1## atom the same as a ##1s^2## atom?
  • Danielk010
  • · Replies 12 ·
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12
Magnetic dipole moment and integration surfaces (Introductory Electromagnetics - Magnetistatics)
  • Graham87
  • · Replies 4 ·
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4
Charge on a grounded conducting sphere in a uniform electric field, after ungrounding and movement
  • Tuatara
  • · Replies 1 ·
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1
Conservation of momentum (center of mass) in projectile launches
  • TheGreatDeadOne
  • · Replies 15 ·
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15
Range of frequency heard by observer related to Doppler effect
  • songoku
  • · Replies 8 ·
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8
Vertical displacement with time of a projectile
  • hello478
  • · Replies 48 ·
2
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Spring Constant Force Problem Help
  • Thana
  • · Replies 12 ·
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12
Is current flowing into a battery always equal to current flowing out?
  • laser
  • · Replies 12 ·
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12
Total Internal Reflection and Transmitted Wavelength
  • vera1
  • · Replies 1 ·
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1
Understanding self-inductance in a solenoid.
  • zenterix
  • · Replies 3 ·
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3
Condition for resolution of two point sources of light
  • songoku
  • · Replies 2 ·
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2
How do I model this function? (Damped Harmonic Motion)
  • daisy7777
  • · Replies 19 ·
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19
Emf in coil rotating inside magnetic field
  • songoku
  • · Replies 3 ·
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3
Refraction of light when traveling from air to glass
  • songoku
  • · Replies 6 ·
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6
Finding critical angle: not sure which one is correct
  • vwoods316
  • · Replies 13 ·
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13
Origin of repulsive force on a magnet approaching conducting ring?
  • zenterix
  • · Replies 5 ·
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5
A wheel of radius r rolls along a curve
  • annamal
  • · Replies 13 ·
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13
Electronic Circuits - Calculate voltage
  • agatha
  • · Replies 4 ·
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4
Newton's third law and weight
  • hello478
  • · Replies 13 ·
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13
Query related to Two-Dimensional Motion
  • Gargi
  • · Replies 9 ·
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9
Camera drone and speed of air below it
  • hello478
  • · Replies 5 ·
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5
Graph of viscous force and velocity
  • hello478
  • · Replies 15 ·
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15
Projectile motion, initial height and range given, find initial velocity
  • dainceptionman_02
  • · Replies 8 ·
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8
Need to derive a formula for the number of red giants
  • Rageuke
  • · Replies 8 ·
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8
Question about time dilation
  • MatinSAR
  • · Replies 22 ·
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22
Derive trig equations 4, 5, and 6 from 1, 2, and 3
  • jfnn
  • · Replies 13 ·
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13
Friction - same direction as motion?
  • mancity
  • · Replies 10 ·
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10
Center of mass acceleration for an inclined plane and mass m
  • Sam Jelly
  • · Replies 18 ·
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18
How Much Vertical Acceleration Does a Jet Need to Avoid a Hill?
  • KukyZ
  • · Replies 2 ·
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2
How Does Coriolis Force Influence Particle Motion in Rotating Systems?
  • Bling Fizikst
  • · Replies 3 ·
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3
2 Masses attached by a spring in the vertical axis
  • Sam Jelly
  • · Replies 8 ·
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8
Minimum work done to push the cube over
  • hello478
  • · Replies 14 ·
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14