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 Water Pressure on a Floating Cube?
  • Molly1235
  • · Replies 4 ·
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Minimum area of a shoe heel exerting pressure
  • Molly1235
  • · Replies 7 ·
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7
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How to Apply Kirchoff's Laws to Solve Resistive Circuit Problems
  • Yosty22
  • · Replies 15 ·
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15
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What is the Correct Angle θ in a Traction Setup with a Pulley System?
  • Minusu
  • · Replies 7 ·
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Laws of Motion: Projectile Collision Calculation
  • pdaniels77
  • · Replies 11 ·
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11
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Electric Circuits: Find Vg & Why is it -2V?
  • sevag00
  • · Replies 8 ·
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8
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Help with vector algebra getting an undefined answer
  • HeJind
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2
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Velocity of object falling from Hill Radius to Earth
  • bowlbase
  • · Replies 9 ·
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How Does Attaching a Weight Affect Spring Equilibrium?
  • physicshawk
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4
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Zero Gravity Flight: Training Astronauts for Space
  • zaddyzad
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4
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Why is this incorrect (special relativity time dilation)
  • channel1
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4
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Projectile motion, throwing a ball at a coconut
  • Kot
  • · Replies 8 ·
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8
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Calculating Vector Magnitude and Angle
  • viet1919
  • · Replies 5 ·
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5
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How do I convert c=9e^((-5/2)∏j) to component notation?
  • Sastronaut
  • · Replies 3 ·
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3
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How Does the Velocity of a Suspended Mass Change with Height?
  • zibs.shirsh
  • · Replies 7 ·
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Frequency Analysis of RC Circuits
  • Sastronaut
  • · Replies 2 ·
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2
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Newton's Laws of Motion - Force Problem
  • Yshai24
  • · Replies 1 ·
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1
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Relationship between Frequency and Standing Waveforms.
  • Kamuin
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1
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Showing the expectation values of a system are real quantities
  • FisiksIdiot
  • · Replies 3 ·
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3
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Simple acceleration, force, and mass question
  • noobphysicist
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1
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Determine Radiation pressure given the fraction of total absorption
  • MrMoose
  • · Replies 2 ·
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2
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How to Find the Electric Potential of a Cylinder on the Z-Axis?
  • bfusco
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1
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Simple Conceptual True/False Questions About Magnetism
  • Yosty22
  • · Replies 1 ·
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1
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Pressure on tyres of a vehicle question - Calculating weight
  • Molly1235
  • · Replies 6 ·
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6
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What are the measurements and gravity on Planet X inhabited by the Xinbar?
  • obravo
  • · Replies 1 ·
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1
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Current flowing through the resistor
  • joaofbi1
  • · Replies 38 ·
2
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Special Relativity: Bullets on a train
  • six7th
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4
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When can we use Vpp in calculations involving Ohm's law?
  • Physixs
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2
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Metal block sliding horizontally
  • majinsock
  • · Replies 1 ·
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1
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Comparing Flux of a Closed Cylinder
  • tuggler
  • · Replies 3 ·
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3
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Equilateral triangle charged rods
  • oreosama
  • · Replies 3 ·
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3
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Relative Motion - Airplane Problem
  • harujina
  • · Replies 4 ·
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4
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Pebble dropped on rotating wheel, starts to slide after rotation
  • zibs.shirsh
  • · Replies 3 ·
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3
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Solving a Homework Equation: ΔV_H
  • Turion
  • · Replies 4 ·
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4
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Magnetic sphere moving through iron dust; find velocity & other things
  • zibs.shirsh
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1
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Electron flow in live and neutral wires
  • nilic1
  • · Replies 2 ·
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2
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Henry gets into an elevator on the 50th floor
  • p14r
  • · Replies 1 ·
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1
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Calculating both final velocities (conservation of momentum)
  • Pharrahnox
  • · Replies 9 ·
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9
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Solving for λ in an Adiabatic Process: Applying the Ideal Gas Equation"
  • S_Flaherty
  • · Replies 22 ·
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22
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2 boxes stacked, determining forces on each other.
  • mathwhiz
  • · Replies 3 ·
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3
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Need Physics help with launching from angle w/ initial velocity
  • astru025
  • · Replies 4 ·
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4
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Direction of induced current in conducting ring due to motion of bar m
  • agoogler
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2
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Vector Magnitudes and projectile motion
  • danosu43
  • · Replies 1 ·
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1
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High School Physics Competition: Change in Entropy
  • ReneG
  • · Replies 3 ·
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3
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General: How do you approach/think of a problem?
  • Drk2
  • · Replies 6 ·
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6
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General question regarding positive and negatives in equations?
  • Ascendant78
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Weight at an Angle: 115kg Football Player & 40° Scale Reading
  • ericka141
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Alternate Solution to Conservation of Momentum Problem
  • aboakye
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Answer = 35.3 Watts to Keep 64oz Bottle at 40 Deg in 10 Deg Temp
  • EnrgyXprt
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Physics satellite velocity and period
  • astru025
  • · Replies 13 ·
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13
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What is the n value for Li2+ ion in the Bohr model of the atom?
  • physicsnobrain
  • · Replies 14 ·
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Solve Tension in Cables (T1, T2, θ3)
  • NXIShift
  • · Replies 4 ·
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Solving for Position with Zero Initial Velocity
  • Bashyboy
  • · Replies 2 ·
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Does a Planet's Atmosphere Affect an Astronaut's Weight?
  • Minou14
  • · Replies 3 ·
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Maxwell-Boltzmann Statistics integral
  • Yakadellic
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Average force during a collision
  • CuriousParrot
  • · Replies 12 ·
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12
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Checking my work on a Lennard-Jones problem
  • Emspak
  • · Replies 12 ·
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What is the minimum tension (in Newtons) in the angled rope?
  • bah83
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Finding the Mass Required for Double the Velocity in a Spring-Mass System
  • brenfox
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1
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Highschool Dynamics Lab. Consistency problem?
  • Fifty
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1
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Is this correct?"Calculating Time of Astronaut's Trip Across 15 Light-Years
  • sexy_brittany
  • · Replies 1 ·
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1
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Forces, displacement, and coordinates of a particle
  • nerdalert21
  • · Replies 11 ·
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11
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Solving Moments of Force: Finding A & B
  • isigne
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[Motion Problem] When is displacement equal?
  • Ticklez_Panda
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3
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Can You Solve These Challenging Linear Motion Problems?
  • Meamour
  • · Replies 8 ·
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8
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Help with spring constant units
  • NewSoul
  • · Replies 3 ·
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3
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Electric flux through a surface
  • Plasmosis1
  • · Replies 3 ·
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3
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Concept question on External force
  • crysland
  • · Replies 13 ·
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13
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Determing the kinetic energy of an electron
  • Turion
  • · Replies 3 ·
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3
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How Does Latent Heat Affect Sweat Evaporation in Cooling the Body?
  • BOAS
  • · Replies 3 ·
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3
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Which problems could arise from this diagram?
  • rogerwilis
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Acceleration of two blocks connected by a pulley
  • Esoremada
  • · Replies 2 ·
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Thrust force of a rocket ejecting mass
  • Emspak
  • · Replies 3 ·
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Force to pull appart hemiphere under vacuum.
  • freezer
  • · Replies 1 ·
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Mercury Barometer Experiment: Atmospheric Pressure
  • ftball22
  • · Replies 1 ·
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1
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How Does Inserting a Dielectric Material Affect Capacitor Charge?
  • kopinator
  • · Replies 3 ·
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Three astronauts equipped with jetpacks
  • p14r
  • · Replies 4 ·
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4
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(Engineering Vectors) Why is this answer correct?
  • engineering810
  • · Replies 3 ·
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Why integrate at these points? (Electric potential of a sphere)
  • tappling
  • · Replies 3 ·
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3
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Calculate Max Velocity of Mass Vibrating: 0.3kg, 200Nm-1, 10mm
  • brenfox
  • · Replies 7 ·
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7
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Why Is the Correct Answer mgh/4 in This Energy Problem?
  • nish123
  • · Replies 3 ·
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3
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Line integral of a spherical vector field over cartesian path
  • PeteyCoco
  • · Replies 4 ·
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4
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How does the period of a pendulum affect its time measurement?
  • DorelXD
  • · Replies 4 ·
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4
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What was the speed of the motorcycle before the collision?
  • Fishingaxe
  • · Replies 14 ·
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14
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Rotary (Gears) question - angular acc/velocity involved
  • skae
  • · Replies 1 ·
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1
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How Is the Angle Determined for the Opposite String in a Suspended Rod Scenario?
  • physicshawk
  • · Replies 2 ·
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Conservation of Energy of an Interrupted Pendulum
  • annaphysics
  • · Replies 1 ·
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1
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Understanding Rydberg's Constant: What Do R(sub)H and R(sub)infinity Represent?
  • Astronomer1
  • · Replies 1 ·
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1
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Average Power Output for 260000 kg Jet at 9200m Altitude
  • spockjones20
  • · Replies 3 ·
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3
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Projectile Motion Diver Jump Question
  • lvn
  • · Replies 1 ·
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1
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Error Propogation: Calculating Average Acceleration w/ Uncertainty
  • 012anonymousx
  • · Replies 2 ·
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General: Calculating the Moment of Inertia
  • ckelly94
  • · Replies 3 ·
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3
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Bike Approaching Stopped Truck at Traffic Lights
  • AltruistKnight
  • · Replies 5 ·
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5
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Rank the material according to their indices of refraction
  • MrMoose
  • · Replies 3 ·
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3
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Probability that the electron will pass through the barrier?
  • Gee Wiz
  • · Replies 9 ·
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9
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Force Applied at an Angle to an Object on Frictionless Surface
  • jpsmith394
  • · Replies 2 ·
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2
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Find frequency given wavelength and distance travelled
  • MrMoose
  • · Replies 1 ·
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1
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How is the angular momentum related to x and y coordinates in SHM?
  • thatguy14
  • · Replies 3 ·
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3
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Solve Ideal Gas Problem Homework: Compute Work Done by Air
  • jeff.berhow
  • · Replies 6 ·
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6
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Find the Angle Between (A+B) and (A-B) is (A+B)=73(A-B)
  • AltruistKnight
  • · Replies 6 ·
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6
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