Introductory Physics Homework Help Forum

Post thread
Free introductory physics homework help step by step from qualified mentors. Algebra and calculus based general physics homework. High school and undergraduate level.
Help Calculating probability between 2 limits for the ground state
  • · Replies 28 ·
Replies
28
Views
2K
POWER - different approach, different results
  • · Replies 23 ·
Replies
23
Views
2K
Help needed in this problem involving a spring and energy balances
  • · Replies 9 ·
Replies
9
Views
1K
How Does an Iron Deposit Affect Water Levels in Fluid Mechanics?
  • · Replies 10 ·
Replies
10
Views
1K
When does Phobos collide with Mars?
  • · Replies 72 ·
3
Replies
72
Views
3K
Calculation of torque and force on magnetic dipole near infinite wire
  • · Replies 3 ·
Replies
3
Views
2K
Calculation of magnetic dipole moment of the Earth
  • · Replies 8 ·
Replies
8
Views
1K
Final Charge of a Capacitor in a Circuit with Capacitors and Resistors
  • · Replies 9 ·
Replies
9
Views
3K
Does a Slowing Piano Exert More Force Than the Man Pushing It?
  • · Replies 3 ·
Replies
3
Views
878
Why is a current ring approx a magnetic dipole from very far off?
  • · Replies 7 ·
Replies
7
Views
2K
Where on a rigid body is a resultant force applied?
  • · Replies 11 ·
Replies
11
Views
2K
Prove this equation for projectile motion
  • · Replies 11 ·
Replies
11
Views
1K
How Does Stress Affect a Hollow Pipe When Force Is Uniformly Applied?
  • · Replies 6 ·
Replies
6
Views
1K
Understanding MIT's applet on sound with Fourier coefficients
  • · Replies 3 ·
Replies
3
Views
2K
Find moment arm of resultant force of two forces applied at two points
  • · Replies 3 ·
Replies
3
Views
1K
A sphere suspended from a cord -- Find the tension
  • · Replies 13 ·
Replies
13
Views
1K
How Is Potential Energy Converted to Kinetic Energy in Physical Systems?
  • · Replies 6 ·
Replies
6
Views
2K
Why don't we find the angular magnification of objective lens in microscopes?
  • · Replies 10 ·
Replies
10
Views
2K
Physics 1 Parabolic Motion Question Confusion
  • · Replies 15 ·
Replies
15
Views
2K
Acceleration in uniform circular motion is uniform or non-uniform?
  • · Replies 55 ·
2
Replies
55
Views
4K
Difference between resonance in undamped vs damped mass-spring-dashpot
  • · Replies 17 ·
Replies
17
Views
4K
Amplitude of harmonic oscillation given position and velocity
  • · Replies 4 ·
Replies
4
Views
1K
Modeling a mass falling from one side of the Earth to the other
  • · Replies 1 ·
Replies
1
Views
1K
Elastic Potential Energy - Positive or Negative?
  • · Replies 5 ·
Replies
5
Views
1K
How Do You Solve a Non-Equilibrium Pulley System with a 154 Degree Angle?
  • · Replies 10 ·
Replies
10
Views
1K
Where Did I Go Wrong in My Refraction Problem Solution?
  • · Replies 11 ·
Replies
11
Views
2K
Conservation of energy problem: Ball rolling down inclined plane and then through a loop-the-loop
  • · Replies 10 ·
Replies
10
Views
3K
Elastic potential energy - different methods, different results
  • · Replies 2 ·
Replies
2
Views
1K
Work Done and Acceleration (Mistaken Answers?)
  • · Replies 5 ·
Replies
5
Views
899
Faraday's law help -- Induced EMF vs. time graph
  • · Replies 7 ·
Replies
7
Views
3K
How can I find the sustain time of an electric guitar?
  • · Replies 7 ·
Replies
7
Views
1K
On what does gravity assist depend? (possibly with sources)
  • · Replies 3 ·
Replies
3
Views
960
Calculation of the magnetic field of four quarter circles
  • · Replies 12 ·
Replies
12
Views
2K
Magnetic Field Due To Wire Of Semi-Circular Cross Section
  • · Replies 5 ·
Replies
5
Views
3K
Calculate the gravitational force between these three masses
  • · Replies 4 ·
Replies
4
Views
1K
Vectors Directions: Where is this Resultant Vector Pointing?
  • · Replies 14 ·
Replies
14
Views
2K
Momentum Physics Problem: Two astronauts throw billiard balls that collide
  • · Replies 8 ·
Replies
8
Views
1K
Understanding work in translation and rotation of a magnetic dipole
  • · Replies 1 ·
Replies
1
Views
3K
Current through a circuit when the key is open
  • · Replies 42 ·
2
Replies
42
Views
6K
Current flowing in an open circuit
  • · Replies 9 ·
Replies
9
Views
2K
Change of internal energy during linear transformation
  • · Replies 11 ·
Replies
11
Views
1K
How does one calculate the number of photons striking a surface per second?
  • · Replies 12 ·
Replies
12
Views
2K
Find net external work of a system w/ 2 objects w/ opposite forces
  • · Replies 8 ·
Replies
8
Views
2K
Internal energy won't add up to 0 in cyclic process
  • · Replies 1 ·
Replies
1
Views
1K
Two balls, dropped with a delay of ##\Delta t##, meet after rebound
  • · Replies 34 ·
2
Replies
34
Views
3K
Static Equilibrium Reaction Question about Fixed Point
  • · Replies 3 ·
Replies
3
Views
1K
Why can we use this approximation in rotational work-kinetic energy theorem for small displacements?
  • · Replies 7 ·
Replies
7
Views
2K
How Do You Begin Creating a PV Diagram from Complex Data?
  • · Replies 21 ·
Replies
21
Views
1K
Instantaneous Acceleration Given Equation for Velocity
  • · Replies 7 ·
Replies
7
Views
1K
Minimal rotational kinetic energy for a gyroscope to precess
  • · Replies 33 ·
2
Replies
33
Views
4K
How does this potential divider circuit work?
  • · Replies 1 ·
Replies
1
Views
772
Vertical Mass Spring System | Analyzing work
  • · Replies 18 ·
Replies
18
Views
2K
Understanding relative velocity in 1D elastic collision
  • · Replies 15 ·
Replies
15
Views
3K
Stefan-Boltzmann's Law. How to apply to the Sun
  • · Replies 8 ·
Replies
8
Views
952
Why Does Surface Tension Allow Bubbles to Form Despite External Pressure?
  • · Replies 3 ·
Replies
3
Views
1K
Optimizing energy expenditure over a race course in cycling
  • · Replies 8 ·
Replies
8
Views
1K
Does levitation distance increase as Fg increase???
  • · Replies 1 ·
Replies
1
Views
1K
Sign of Work (Negative or Positive)
  • · Replies 4 ·
Replies
4
Views
1K
Kinetic energy in center of mass reference frame
  • · Replies 3 ·
Replies
3
Views
2K
How Can Derivatives Determine Speed in Physics Problems?
  • · Replies 20 ·
Replies
20
Views
2K
Work Pulley Problem with constant speed
  • · Replies 2 ·
Replies
2
Views
2K
A ball is thrown w/initial speed vi at an angle 𝜃i with the horizontal
  • · Replies 5 ·
Replies
5
Views
2K
Spinning a Bucket to measure gravity with the parabolic surface of the water
  • · Replies 17 ·
Replies
17
Views
2K
Angular acceleration of plank hanging off edge with a weight
  • · Replies 7 ·
Replies
7
Views
2K
Compare the conductance of an insoluble salt with soluble one
  • · Replies 2 ·
Replies
2
Views
1K
Circuit with potential difference across battery being zero?
  • · Replies 3 ·
Replies
3
Views
2K
How Do You Calculate Wire Extension Under Sudden Loads?
  • · Replies 15 ·
Replies
15
Views
2K
Final velocity of the barbell dropped after a dead lift
  • · Replies 7 ·
Replies
7
Views
1K
How can I calculate the Density and Volume of a mechanical mixture (atoms)?
  • · Replies 6 ·
Replies
6
Views
1K
Why do the headlights on the car become dim when the car is starting?
  • · Replies 4 ·
Replies
4
Views
2K
Why Is Energy Released in Nuclear Decay Equal to Change in Binding Energies?
  • · Replies 13 ·
Replies
13
Views
2K
Translational Equilibrium Practice problem
  • · Replies 2 ·
Replies
2
Views
1K
Worst-case power consumed by a circuit with MOSFETs
  • · Replies 2 ·
Replies
2
Views
1K
Flux linked with circular coil vs solenoid
  • · Replies 14 ·
Replies
14
Views
2K
Can Two Particles Have Multiple Collisions in a Single Interaction?
  • · Replies 17 ·
Replies
17
Views
2K
How force on atom in diatomic molecule varies with distance
  • · Replies 12 ·
Replies
12
Views
1K
Electromagnetic Induction in AC circuits
  • · Replies 3 ·
Replies
3
Views
2K
Using energy considerations to analyse particle motion
  • · Replies 3 ·
Replies
3
Views
1K
Dragging an object: what is Fmin and magnitude of acceleration?
  • · Replies 3 ·
Replies
3
Views
1K
Comparison between two Tippe tops
  • · Replies 1 ·
Replies
1
Views
901
Why does mass not affect sliding speed down an inclined plane?
  • · Replies 4 ·
Replies
4
Views
1K
Find the value of ##θ## and frictional force acting on the block.
  • · Replies 5 ·
Replies
5
Views
1K
Find the Tension in the cable when the lift is moving at constant speed
  • · Replies 3 ·
Replies
3
Views
2K
Using energy considerations to determine speed
  • · Replies 4 ·
Replies
4
Views
954
Series RLC circuit connected to a DC battery
  • · Replies 12 ·
Replies
12
Views
2K
Finding the center of mass of a piecewise function
  • · Replies 5 ·
Replies
5
Views
1K
Confused by Lorentz transformation equation
  • · Replies 36 ·
2
Replies
36
Views
4K
Final speed of particle far away from rings with opposite charges
  • · Replies 9 ·
Replies
9
Views
2K
Is the Total Energy Change in a Closed System Always Zero?
  • · Replies 8 ·
Replies
8
Views
1K
Sound absorption/Acoustuic attenuation coefficeint (α(ω)) of PVC foam?
  • · Replies 1 ·
Replies
1
Views
813
Is potential energy defined only for internal conservative forces?
  • · Replies 15 ·
Replies
15
Views
2K
How to Determine Temperature Difference Between Two Stars Using Spectral Lines?
  • · Replies 0 ·
Replies
0
Views
2K
A sphere held steady on a slope by a rope
  • · Replies 7 ·
Replies
7
Views
1K
Find force as a function of position: F=F(x) using v=v(t)
  • · Replies 6 ·
Replies
6
Views
1K
Refractive index of seawater and a diver transmitting RF for 100 meters
  • · Replies 3 ·
Replies
3
Views
981
Bead sliding along wire with constant horizontal velocity -- Shape of wire?
  • · Replies 2 ·
Replies
2
Views
2K
Forces applied to a spring-loaded gas pedal
  • · Replies 7 ·
Replies
7
Views
2K
Index Notation, Identity Matrix
  • · Replies 4 ·
Replies
4
Views
881
Create a physics problem for me!
  • · Replies 5 ·
Replies
5
Views
1K
The movement of a package on a conveyor belt
  • · Replies 2 ·
Replies
2
Views
1K