Free introductory physics homework help step by step from qualified mentors. Algebra and calculus based general physics homework. High school and undergraduate level.
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Thrust of Jet Plane: Why Is -313m/s^2 Wrong?
- walking
- · Replies 15 ·
How does an elevator maintain a constant speed despite changes in load?
- walking
- · Replies 8 ·
Why 0.3m From Lens Is Optimal Focus?
- phantomvommand
- · Replies 3 ·
Calculating Signal to Noise due to thermal noise
- JoJoQuinoa
- · Replies 2 ·
Finding area from work, pressure and volume
- JoeyBob
- · Replies 9 ·
Inconsistencies in Work and Energy Calculations for an Infinitely Thick Sheet?
- A13235378
- · Replies 6 ·
Finding blood pressure from density and height difference
- yourheartandsoul
- · Replies 6 ·
Find the phase difference in terms of d, lambda, theta
- joelkato1605
- · Replies 1 ·
If I pull a pulley, what is the tension in the string around it?
- phantomvommand
- · Replies 4 ·
Getting the equations of motion for this SHM problem
- phantomvommand
- · Replies 8 ·
Find rate of temperature change using heat capacity, density and area
- JoeyBob
- · Replies 4 ·
Work done to bring the Earth to rest
- walking
- · Replies 6 ·
What is the work done by a horse pulling a cart?
- walking
- · Replies 4 ·
Why Does Calculating Train Engine Power Result in Different Values?
- Bix
- · Replies 3 ·
Find the change in entropy for an ideal gas undergoing a reversible process
- mcas
- · Replies 3 ·
Equations of motion of a 2-DoF Free damped vibration system
- mmullan
- · Replies 7 ·
Is it okay to add error bars into a histogram plot?
- tryingtolearn1
- · Replies 10 ·
When do formulas for adiabatic processes apply?
- phantomvommand
- · Replies 1 ·
Mass flow and rolling carts (Kleppner 3.11)
- geoffrey159
- · Replies 4 ·
RLC Circuit Analysis -- Two sources and two switches
- wcjy
- · Replies 3 ·
Is My Approach to Solving a Source-Free RLC Series Circuit Correct?
- wcjy
- · Replies 2 ·
Understanding Power Calculation: 1.5MW vs 1.47MW Explained
- Bix
- · Replies 2 ·
Bayes' theorem and disease prevalence
- BRN
- · Replies 12 ·
Why Might a Rotating Ring in a B-field Ignore Certain Torques?
- phantomvommand
- · Replies 2 ·
Electric Field -- Potential between the ends of a 2 meter stick
- Fikremariam
- · Replies 6 ·
Roller coaster dropped 65m to rest: why is net work zero?
- john merrick
- · Replies 8 ·
Problem on thermal radiation and lenses
- phantomvommand
- · Replies 3 ·
Calculating Fermi Coupling Constant (muon)
- tryingtolearn1
- · Replies 6 ·
Rate of heat flux from from hot gas in a pipe to water outside
- phantomvommand
- · Replies 2 ·
Find the power of a man running (work and potential energy)
- Jujubee37
- · Replies 8 ·
Work done by electric field to move capacitor plate
- polls_king23
- · Replies 4 ·
Does coefficient of kinetic friction depend on speed?
- guyvsdcsniper
- · Replies 16 ·
Dipole moment of a rotating disk
- VVS2000
- · Replies 15 ·
Problem on induced electric field, electrodynamics
- phantomvommand
- · Replies 5 ·
Can Someone Help Me Solve Physics Problems?
- lpettigrew
- · Replies 3 ·
How Is the Average Force Calculated When a Pole Vaulter Lands?
- bane32
- · Replies 5 ·
What is the force exerted by the pivot on the stick?
- hidemi
- · Replies 2 ·
Electric field at the center of a charged ring
- takelight2
- · Replies 5 ·
Checking my diode power calculation
- WRS
- · Replies 4 ·
Periodic vs. oscillatory motion
- abdsaber000
- · Replies 3 ·
Nuclear physics - solar neutrinos interacting
- Benlaww
- · Replies 11 ·
Finding the directions of eigenvectors symmetric eigenvalue problem
- Andrew1235
- · Replies 1 ·
Does Throwing an Object Overboard Affect Pond Water Level?
- TomK
- · Replies 2 ·
Rocket moving away from the Earth
- Frostman
- · Replies 38 ·
What is the final angular velocity of the system after the collision?
- hidemi
- · Replies 4 ·
What is the angular momentum of the clay-rod system?
- hidemi
- · Replies 12 ·
Why is my kinetic energy result in wrong units?
- Krokodrile
- · Replies 12 ·
Does the 680J in this incline problem become irrelevant after cancellation?
- walking
- · Replies 11 ·
Calculate current through resistors
- Andrei0408
- · Replies 8 ·
Magnetic and electric fields in relativity
- Frostman
- · Replies 2 ·
Work done on an Object - Pulling a wagon while lifting up at an angle
- jigsaw21
- · Replies 1 ·
Difficult capacitance problem -- 3 long concentric metal cylinders
- phantomvommand
- · Replies 7 ·
Spin-Lattice and Spin-Spin Relaxation Time Question
- Athenian
- · Replies 1 ·
Solving a Vector Triangle Differential Equation
- phantomvommand
- · Replies 3 ·
Feynman irreversible and reversible weightlifting machine
- Est120
- · Replies 1 ·
Relative velocity of objects on a rotating carousel
- guv
- · Replies 2 ·
Change of angle if refractive index changes for 10^-6
- AncientOne99
- · Replies 5 ·
The magnitudes of the applied force F and the frictional force f of a wheel
- hidemi
- · Replies 2 ·
What are the units for the slope in an Acceleration vs Mass Graph?
- guyvsdcsniper
- · Replies 3 ·
Rolling kinetic energy for sphere, cylinder and hoop
- hidemi
- · Replies 11 ·
Radiation - finding emissivity of a sphere
- JoeyBob
- · Replies 3 ·
Solving a Problem with Velocity: Stuck and Need Help
- bob1352
- · Replies 5 ·
Calorimetry - finding the final temperature of a system of ice and water
- JoeyBob
- · Replies 7 ·
Current flowing through a resistor in an RRL DC circuit
- greg_rack
- · Replies 5 ·
Does a charged insulating ring turn if a B-field is switched on?
- phantomvommand
- · Replies 10 ·
Linear Expansion - Finding temperature
- JoeyBob
- · Replies 5 ·
Potential energy due to an external charge and a grounded sphere
- phantomvommand
- · Replies 8 ·
How many undecayed nuclei will remain?
- Physicsman788
- · Replies 6 ·
Rotational motion and angular momentum
- hquang001
- · Replies 5 ·
Determine the currents I1, I2, and I3.
- RushiOfFlames
- · Replies 4 ·
Calculating Velocity in the Millikan Oil Drop Experiment
- happyparticle
- · Replies 52 ·
What is the purpose of the decay time distribution equation?
- tryingtolearn1
- · Replies 3 ·
EMF induced by a magnet falling through a coil
- zee123
- · Replies 4 ·
Force needed to hold together a capacitor
- phantomvommand
- · Replies 4 ·
Why is the pressure on a charged sphere only exerted on the contact area?
- phantomvommand
- · Replies 6 ·
Electric Potential of point outside cylinder
- jkthejetplane
- · Replies 8 ·
Electric Field at the end of a Half-Infinite Cylinder
- cwill53
- · Replies 4 ·
How is the energy tranported at a certain time and point?
- hidemi
- · Replies 2 ·
Light entering and exiting a triangle - why do I get the same angle twice?
- JoeyBob
- · Replies 9 ·
Finding second furthest distance of const interference from 2 sources
- JoeyBob
- · Replies 6 ·
Circuit problem with two sources and three resistors (Nodal Analysis)
- wcjy
- · Replies 11 ·
Bowling Ball is rolled down a steep hill
- IAmBadAtMath
- · Replies 11 ·
Why does a falling chain accelerate at g after its first part touches the ground?
- phantomvommand
- · Replies 7 ·
What is the difference between negative charge and free electron?
- Candies2002
- · Replies 2 ·
Change in entropy of an irreversible adiabatic process
- gjb24mrspotts
- · Replies 3 ·
Student jumping on a moving carriage: is book or my solution right?
- phantomvommand
- · Replies 2 ·
Finding My Calculation Error: Where Did I Go Wrong?
- hidemi
- · Replies 6 ·
Direction of friction in a yoyo rolling on an inclined plane
- dahoom102
- · Replies 3 ·
Simple Harmonic Motion of a Mass Hanging from a Vertical Spring
- momoneedsphysicshelp
- · Replies 6 ·
Uncertainty of Speed of Sound in water, using Mackenzie's Equation
- Lloyd_Towler
- · Replies 9 ·
Linear momentum problem with n particles
- hquang001
- · Replies 10 ·
Impedeance of parallel RLC circuit
- hidemi
- · Replies 3 ·
Why doesn't V=2πr/T work for geosynchronous satellites?
- guyvsdcsniper
- · Replies 4 ·
Why I*ε Cannot be Used to Calculate Power
- hidemi
- · Replies 4 ·
A Car on a Banked Curve Moving in Uniform Circular Motion
- RoboRaptor
- · Replies 7 ·
Brake mechanism in a car and pressurised oil
- brotherbobby
- · Replies 4 ·
Michelson interferometer -- Plotting experimental data to determine t
- joelkato1605
- · Replies 12 ·
Understanding Inductor Behavior When Transistors Are Off
- PhysicsTest
- · Replies 12 ·
Black body radiation -- Spherical shell surrounding a star
- Eitan Levy
- · Replies 10 ·
Why does the bat Doppler problem set both frequencies equal in the second step?
- physicsfan999
- · Replies 1 ·