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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Coulomb's Law and electric force
- angel_romano
- · Replies 1 ·
Average and instantaneous power-
- kajalove
- · Replies 3 ·
Stone projected at 56° toward cliff: find height, speed and max height
- frankfjf
- · Replies 12 ·
What is the half life of this isotope?
- RoRo
- · Replies 2 ·
Understanding Torque and Acceleration in Uniform Circular Motion
- Amith2006
- · Replies 1 ·
Building a gravity-powered vehicle for a 5 meter distance challenge
- anna.kate
- · Replies 7 ·
Does the exhaust gas hitting the ground help a rocket take off?
- physicsilliterate69
- · Replies 3 ·
Projectile Motion of Dart: Calculating Distance and Release Point
- frankfjf
- · Replies 3 ·
How Does a Rocket Ship Work Using Newton's Third Law?
- physicsilliterate69
- · Replies 1 ·
How Do You Calculate the Speed of a Ball Returning to the Bottom of an Incline?
- teng125
- · Replies 1 ·
Energy conservation of a sliding box
- utsharpie
- · Replies 1 ·
Solving for a: Finding Magnitude of a+b
- n3kt
- · Replies 1 ·
What is the Potential at the Origin for a Uniformly Charged Semi-Circle?
- brad sue
- · Replies 1 ·
Train average velocity angle relative to north in navigation coordinates
- frankfjf
- · Replies 7 ·
What is the speed of a synchronous satellite in orbit around the Earth?
- dxlogan187
- · Replies 3 ·
Force and tension problems without using Newton's laws
- Shay10825
- · Replies 4 ·
How Do I Calculate the Vertical Force Needed to Pull a Copper Ball in Fluid?
- FalcoAtl
- · Replies 1 ·
Pressure due to molecular velocity problem
- pmastchief
- · Replies 3 ·
Bullet buries itself in a pendulum: how far does it swing?
- mrtkawa
- · Replies 2 ·
How Does the Doppler Effect Alter Wavelength as a Train Approaches?
- astronomystudent
- · Replies 1 ·
Charge Rod Question: Electric Field at Point
- daveo123
- · Replies 1 ·
Displacement angle of watermelon seed in 3D coordinates
- frankfjf
- · Replies 7 ·
Does a pendulum hanging on a rope has any normal force?
- teng125
- · Replies 4 ·
The Physics of Wind (Not Aerodynamics in the strictest sense)
- freesonwang
- · Replies 4 ·
What is the solution to this momentum problem?
- pureouchies4717
- · Replies 2 ·
Newton's second law and the egg drop
- Gamma
- · Replies 3 ·
How to find the acceleration of two objects on a pulley system
- pureouchies4717
- · Replies 6 ·
Finding the Period of a Physical Pendulum Attached to a Solid Sphere
- jboone88
- · Replies 1 ·
Fitzgerald-Forentz contraction problem
- capslock
- · Replies 4 ·
Block colliding with spring: find displacement, period, energy and force
- nyyfan0729
- · Replies 1 ·
Physical pendulum: period, angular displacement, and maximum torque
- nyyfan0729
- · Replies 1 ·
Why they have the same potential?
- bethny10
- · Replies 5 ·
Radio transmitter interference pattern with phase offset
- ScienceMonkey
- · Replies 4 ·
How Do Sign Conventions Affect Calculations in Spherical Mirrors?
- alfredbester
- · Replies 3 ·
Why are electric field lines perpendicular to equipotential lines?
- jrd007
- · Replies 2 ·
Waves: Standing Waves, Superposition, etc.
- dekoi
- · Replies 4 ·
How do you find internal energy of U=Q+W?
- nrc_8706
- · Replies 1 ·
Solve Momentum Problem: Find Bullets/Sec Needed for Cart to Reach 19m/s
- pureouchies4717
- · Replies 2 ·
Ball thrown at an angle reaches 8.0m height and 16m range
- rachael
- · Replies 3 ·
Problem: Watch attached to a string in an airplane
- N_L_
- · Replies 4 ·
Time of flight and range for stone projected from a 150m tower
- rachael
- · Replies 3 ·
Electric field distance problem
- physicscnewb
- · Replies 9 ·
Deriving the voltage formula for a potentiometer circuit
- brad sue
- · Replies 6 ·
Work done along a quarter circle path
- esradw
- · Replies 4 ·
Proving that diagonals of a parallelogram bisect each other
- frozen7
- · Replies 1 ·
Calculating Height in a Free Fall: What's the Formula?
- angina1
- · Replies 2 ·
What is the maximum B-field in the iron core?
- Clari
- · Replies 1 ·
Friction Forces on rock climber
- mb85
- · Replies 2 ·
Solving a Parabolic Function Near the Minimum of the Morse Potential
- capslock
- · Replies 1 ·
Does adding heat affect work done by gas on its surroundings?
- nrc_8706
- · Replies 1 ·
Acceleration and distance for a car in three motion intervals
- angina1
- · Replies 7 ·
Current in cell during a certain period
- eagle63903
- · Replies 1 ·
Can High School Physics Explain Motion with Constant Acceleration and Velocity?
- Signifier
- · Replies 2 ·
Finding relative minima for two 800 Hz speakers 1.25 m apart
- jesuslovesu
- · Replies 4 ·
How Do You Calculate the Velocity of Electrons in Non-Relativistic Settings?
- gulsen
- · Replies 6 ·
Kinetic theory of gases - can someone check this please?
- QueenFisher
- · Replies 1 ·
Will the radial acceleration be constant?
- Amith2006
- · Replies 3 ·
Finding current through a resistor in a parallel circuit
- Firestrider
- · Replies 4 ·
Is the Slope of an X vs T Plot Velocity or Acceleration?
- M98Ranger
- · Replies 1 ·
How Do You Calculate Total Impedance in a Mixed RLC Parallel Circuit?
- trailtiger
- · Replies 1 ·
Friction / inclined plane question
- N_L_
- · Replies 2 ·
Calculating Kinetic Energy of a 15g Nail Struck by 550g Hammer
- Hughey85
- · Replies 3 ·
How Does Rocket Propulsion Work?
- physicsilliterate69
- · Replies 21 ·
Distance-time Graph and Velocity-time Graphs
- Alain12345
- · Replies 5 ·
A car moves with constant velocity
- tony873004
- · Replies 3 ·
How Should L and A Change to Adjust Power Dissipation and Current in a Wire?
- positron96
- · Replies 4 ·
Energy from battery charging a capacitor through a resistor
- Lewis
- · Replies 1 ·
me (problems with rotating cylinder)
- kendro
- · Replies 2 ·
Why is the period of a pendulum proportional to the square root of its length?
- warriorofrovac
- · Replies 7 ·
Total internal reflection in a glass prism with 30-60-90 angles
- twiztidmxcn
- · Replies 2 ·
Calculating Cannon Range on a Slope
- syang9
- · Replies 4 ·
Electrostatic equilibrium and Gauss' law
- Kenny Lee
- · Replies 3 ·
Calculating Electric Field Strength and Direction at a Given Point
- supersleeves
- · Replies 10 ·
How Do You Calculate Projectile Motion for a Stone Thrown from a Tower?
- rachael
- · Replies 1 ·
When Will Two Vertically Thrown Stones Reach the Same Height?
- Emortal
- · Replies 5 ·
How do I add three vector components together?
- physicssux
- · Replies 1 ·
Calculating Capacitance from Voltage-Time Data
- jdog6
- · Replies 3 ·
Electric Potential Difference Created by Point Charges
- BoogieL80
- · Replies 2 ·
Which Track Will Have the Greater Ball Speed?
- cutie05
- · Replies 4 ·
What Water Levels Produce Resonance Frequencies with a Tuning Fork?
- dekoi
- · Replies 1 ·
How do different materials produce different colored flames when burned?
- kitkat
- · Replies 1 ·
Magnetic field from lightning bolt at 1.4 m distance
- jakeowens
- · Replies 1 ·
Does Electric Field Intensity Stay Constant Between Charged Parallel Plates?
- David Furlong
- · Replies 1 ·
Tension of string and circular motion question
- Signifier
- · Replies 2 ·
Answer: Ballistic Pendulum: Bullet Collision & Max Height
- nahya
- · Replies 3 ·
Barometric pressure on Mt. Everest with constant density assumption
- endeavor
- · Replies 6 ·
Gravitational Forces of binary star
- nitrostar
- · Replies 2 ·
Centripetal Acceleration of Rock Problem
- Rozy
- · Replies 2 ·
Calculate Work Done on 2.8kg Aluminum at Atmospheric Pressure
- AdnamaLeigh
- · Replies 3 ·
Maximum possible momentum change in isolated system
- xailer
- · Replies 2 ·
How Is Total Force Calculated on a Dam Wall?
- hannsparks
- · Replies 2 ·
Doppler effect when observer and source are the same object
- dekoi
- · Replies 7 ·
Calculating Work and Power in Basic Physics: A Case Study
- WillyTech
- · Replies 3 ·
Electric force on electron in hydrogen atom with unknown charges
- pete1667
- · Replies 2 ·
How Does Ampere's Law Explain Magnetic Fields at the Poles?
- cscott
- · Replies 3 ·
How fast is the skier going just before she lands?
- ussjt
- · Replies 3 ·
Galilean Relativity: I can't figure this out
- motherlovebone
- · Replies 1 ·
What are the equations for finding ball position in relativity?
- motherlovebone
- · Replies 7 ·
How Does Speed Affect Space Measurements in Special Relativity?
- capslock
- · Replies 1 ·
Does Magnification Affect Both Vertical and Horizontal Dimensions in Lenses?
- Mishy
- · Replies 1 ·