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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How Many Electrons Does a Cathode Ray Tube Emit Per Second?
- chocolatePI
- · Replies 9 ·
Rotational kinetic energy of ice skater
- Erenjaeger
- · Replies 6 ·
Calculating Forces at A and B on Shelf in Slot
- elf197320501
- · Replies 4 ·
Solving a Hockey Puck Collision: Final Velocity
- Veronica_Oles
- · Replies 5 ·
What are the tension and angle of support rope for a cylinder about to slip?
- Vitani11
- · Replies 18 ·
Archived Optics: Shift in y from a thin pane of glass, young's experiment.
- lcd123
- · Replies 1 ·
Current through 5Ω resistor and potential at node a using Kirchhoff's laws
- gkamal
- · Replies 11 ·
Archived Reflecting telescope with curved objective and eyepiece mirrors
- tommy128268
- · Replies 1 ·
Pendulum swinging and hitting a peg
- angrymasteryoda
- · Replies 1 ·
Finding Electric Field at a Given Position due to Point Charges
- IsmailKemal
- · Replies 1 ·
Forces: find angle without x/y components?
- Shelilla
- · Replies 2 ·
Archived Angular magnification and the magnifying glass
- Reservist
- · Replies 1 ·
What is the velocity of the projectile when it hits the net?
- gungo
- · Replies 2 ·
Average velocity vector of non-uniform circular motion?
- Carpetfizz
- · Replies 1 ·
Comparison of internal energies: hot nail versus beaker of water
- memeningful
- · Replies 4 ·
Archived How Can You Calculate the Wavelength in a Double Slit Experiment?
- quicksilver123
- · Replies 1 ·
Archived Optics - magnification of a converging lens
- matematikuvol
- · Replies 1 ·
Is PV^gamma Constant in Adiabatic Processes?
- stratz
- · Replies 9 ·
In which case is the period larger? ( Above earth or below?)
- Vitani11
- · Replies 21 ·
What is the Recoil Velocity of a Cannon Shooting a 30 kg Shell at 500 m/s?
- Luke0034
- · Replies 3 ·
Solving a Midterm Physics Problem: Masses A & B with Springs
- DCholic
- · Replies 1 ·
What Does Over Time Imply in the Context of the Huygens–Fresnel Principle?
- Hamal_Arietis
- · Replies 18 ·
Time for which RTG will supply the required energy output?
- moenste
- · Replies 15 ·
Question on the free-fall of 2 bodies
- Mr.maniac
- · Replies 9 ·
What Colors of Light Are Absorbed by Electrons in a 3.1 nm Infinite Well?
- GummyLizard
- · Replies 1 ·
Kinematics of a Thrown Ball: Finding Time to Reach Ground
- Kajan thana
- · Replies 2 ·
How to calculate tension in straight-line motion
- Peter Halsall
- · Replies 3 ·
Which of the following is not a simple harmonic system.
- cychengad
- · Replies 1 ·
Can a balance give accurate reading if measured on the moon?
- alisdfd
- · Replies 1 ·
What is the mass of 55 Cancri in kg and solar masses?
- Lauren0619
- · Replies 5 ·
How Do You Calculate Capacitance for Split Capacitors in PhET Simulations?
- physocs1
- · Replies 3 ·
Rocket speed with changing mass and variable gravity
- Garunekk
- · Replies 11 ·
Can't Identify Error in Calculation
- RBF
- · Replies 5 ·
Infinite square well with step function: probability depends on L?
- danmel413
- · Replies 5 ·
Understanding Heat Transfer in a Closed System with a Moving Piston
- vijayram
- · Replies 22 ·
How Fast is an Asteroid Traveling Toward Earth?
- fleetingmoment
- · Replies 4 ·
New distance between the Geiger counter and the source
- moenste
- · Replies 9 ·
The x components of the average accelerations?
- emily081715
- · Replies 33 ·
Ratio of the rate of decay of R to that of S after 2 hours
- moenste
- · Replies 3 ·
Nuclear equation of the decay, decay constant, # of atoms
- moenste
- · Replies 24 ·
How to make this circuit easier?
- Earthland
- · Replies 6 ·
Calculate the deflection sensitivity in mm per volt
- moenste
- · Replies 44 ·
Calculate the focal length of a planoconvex lens?
- givemeknowledge
- · Replies 2 ·
Masses Over a Uniform Cylindrical Pulley
- Cdh0127
- · Replies 1 ·
When Voltage is Constant (DC), is current also constant?
- Ocata
- · Replies 3 ·
Calculate tension and strain of wire
- kdunkzz
- · Replies 1 ·
What would be the relaxed length of the spring?
- kdunkzz
- · Replies 2 ·
Change in rotational kinetic energy
- Minestra
- · Replies 15 ·
Masses over a Pulley (w/ angular kinematics)
- Cdh0127
- · Replies 4 ·
Finding velocity and work of a collision
- Jrlinton
- · Replies 5 ·
Calculate the Orbital Radius of a Planet
- Slurpee12
- · Replies 1 ·
Elastic collision with pendulum
- Jrlinton
- · Replies 4 ·
Very quick easy Trig/Angle question
- Pablo1122
- · Replies 14 ·
What is the period of the loaded tuning fork?
- blue.flake
- · Replies 4 ·
Equations of Motion of a Mass Attached to Rotating Spring
- SaraM
- · Replies 4 ·
Magnetic Field produced by moving charges
- shirobon
- · Replies 2 ·
Height in conservation of energy problem
- acaulkin
- · Replies 3 ·
What is the force exerted by each hinge on the door?
- kamhogo
- · Replies 3 ·
Finding velocity upon collision
- Godisnemus
- · Replies 12 ·
Speed, force, magnetic flux of an ion?
- moenste
- · Replies 13 ·
Calculating the Year Length of a Gak Planet
- Stevemotto
- · Replies 6 ·
Wave Problem (time for a point to move half a wavelength)
- terryds
- · Replies 4 ·
Tension in the string holding a falling chain
- Nathanael
- · Replies 37 ·
Voltmeter reading and charge when closing switch K with three capacitors
- Biker
- · Replies 9 ·
Conservation of energy/Finding maximum height
- fishturtle1
- · Replies 2 ·
Special Relativity spaceship problem
- Taylor_1989
- · Replies 1 ·
Car accelerating, cruising, then braking to stop at 100 m
- Adriano25
- · Replies 12 ·
Forces acting on bar magnet inside a charged solenoid
- Recoil
- · Replies 9 ·
Calculating Total Charge on Non-Uniformly Charged Sphere
- doktorwho
- · Replies 8 ·
Archived Oscillation with Green's Function
- Menteith
- · Replies 2 ·
Period of motion of an object dropped through the Earth
- kubaanglin
- · Replies 14 ·
Understanding accelerometer data
- HalcyonicBlues
- · Replies 15 ·
Inductive charging: Emf induced in two coil loops
- khfrekek92
- · Replies 4 ·
What Determines the Force on a Charge?
- Ashley1nOnly
- · Replies 1 ·
How much energy is dissipated in the fourth bounce?
- emily081715
- · Replies 1 ·
Why is power loss = I^2R instead of P=VI or P=I^2R?
- victorhugo
- · Replies 14 ·
How many electron charges are there on the drop? (Millikan)
- moenste
- · Replies 26 ·
Radius of Half Electric Potential Energy
- NiendorfPhysics
- · Replies 3 ·
Energy of photon from rotational state with angular momentum quantum number l
- Vitani11
- · Replies 10 ·
Temperature Calculation for a Distant Star with Thermal Excitation
- Vitani11
- · Replies 3 ·
How do I calculate the acceleration of the C.O.M. of a pulley system?
- Eclair_de_XII
- · Replies 8 ·
Find the force of attraction for a particle outside sphere
- Vitani11
- · Replies 7 ·
Determine the speed of the block at the bottom of the inclin
- emily081715
- · Replies 12 ·
How much energy is dissipated in the first bounce?
- emily081715
- · Replies 11 ·
Gravitational Potential due to spherical shell
- Elvis 123456789
- · Replies 3 ·
Force Problem: force direction and choice of sign for g
- unknown physicist
- · Replies 4 ·
Electric field in nichrome wire with same current as gold wire
- ricky25j
- · Replies 1 ·
How Does Huygen's Principle Explain Wave Propagation?
- Aliasa
- · Replies 2 ·
Finding final velocity and position of a two ended rocket
- Jrlinton
- · Replies 4 ·
Simple Harmonic Oscillator: Mass Spring System
- Dusty912
- · Replies 2 ·
Calculate the speed of the electrons as they enter the gap
- moenste
- · Replies 43 ·
Ground state energy for exciton in Si
- adamaero
- · Replies 16 ·
Mass, Density and Volume of atmosphere
- Any Help
- · Replies 10 ·
Voltage drop across connecting wires?
- ooohffff
- · Replies 3 ·
Finding magnitude of tension that causes object to slip
- B_Ran
- · Replies 3 ·
Electron vs Photon question? Significance of momentum?
- curiousmind04
- · Replies 31 ·
Particular Solution of A Coupled and Driven Oscillator
- PatsyTy
- · Replies 3 ·
Force on a mass by two fixed masses
- kubaanglin
- · Replies 3 ·
Find the voltage across the resistor
- ooohffff
- · Replies 3 ·
How Do Object Space and Image Space Affect Lens Calculations?
- Drakkith
- · Replies 2 ·