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.
What Determines Maximum Tension in a Cord Between Two Blocks on Inclined Planes?
  • · Replies 25 ·
Replies
25
Views
5K
Is the force exerted by a pivot always towards the center of mass?
  • · Replies 10 ·
Replies
10
Views
3K
What is the correct angle of displacement for a clock arm?
  • · Replies 26 ·
Replies
26
Views
2K
What is the definition of potential energy of a system?
  • · Replies 2 ·
Replies
2
Views
1K
How can two cylindrical lenses can be used to form a laser sheet?
  • · Replies 4 ·
Replies
4
Views
2K
Gravitational force equals centrifugal force?
  • · Replies 23 ·
Replies
23
Views
3K
Special relativity and simultaneity: Spacecraft and Target
  • · Replies 2 ·
Replies
2
Views
1K
Different forms of Biot-Savart Law
  • · Replies 6 ·
Replies
6
Views
2K
Fluid flow inside a cylindrical tank
  • · Replies 8 ·
Replies
8
Views
2K
How does a mass moving up a ramp change its velocity?
  • · Replies 5 ·
Replies
5
Views
2K
The Net Electric Field Inside a Dielectric
  • · Replies 10 ·
Replies
10
Views
4K
How to calculate differential work done by a force in circular motion?
  • · Replies 1 ·
Replies
1
Views
1K
To find the forces on a composite object
  • · Replies 6 ·
Replies
6
Views
1K
Calculating magnetic field given dl, current, and radius vector
  • · Replies 1 ·
Replies
1
Views
1K
What Mistake Was Made in Finding the Speed of the Boxes?
  • · Replies 20 ·
Replies
20
Views
4K
Mass slipping on a moving inclined plane
  • · Replies 5 ·
Replies
5
Views
2K
Free Body Diagram for a Piece of Gum on the Underside of a Desk
  • · Replies 6 ·
Replies
6
Views
2K
Why Use bh/2 for the Area of a Non-Right Triangle?
  • · Replies 7 ·
Replies
7
Views
6K
2 bodies spining and cut in the middle
  • · Replies 16 ·
Replies
16
Views
2K
Are My Inductor Equations Correct?
  • · Replies 6 ·
Replies
6
Views
2K
Calculate the dose rate in a drum of U3O8
  • · Replies 3 ·
Replies
3
Views
1K
Electrodynamics for a rotating ring
  • · Replies 3 ·
Replies
3
Views
3K
Speed/Velocity and Volume Flow Rate of Viscous Fluids
  • · Replies 5 ·
Replies
5
Views
2K
Calculating the Number of Lines for a Diffraction Grating
  • · Replies 3 ·
Replies
3
Views
3K
Minkowski diagram, where to put an event
  • · Replies 6 ·
Replies
6
Views
2K
Choosing an Axis of Rotation for Equilibrium Analysis
  • · Replies 8 ·
Replies
8
Views
2K
Pressure due to a Liquid on container Wall
  • · Replies 6 ·
Replies
6
Views
2K
What happens to a ball placed on a moving conveyor belt?
  • · Replies 8 ·
Replies
8
Views
4K
What kind of motion is this? (bicycle velocity vectors)
  • · Replies 12 ·
Replies
12
Views
1K
[HW question] Image size difference of two light emitting nanospheres
  • · Replies 4 ·
Replies
4
Views
1K
Gauss' law and flux concept issues
  • · Replies 2 ·
Replies
2
Views
1K
[Optics] Compound microscope (homework quiz)
  • · Replies 7 ·
Replies
7
Views
1K
Inside glass, can I apply relativity of speed for light?
  • · Replies 4 ·
Replies
4
Views
1K
Question about the average acceleration
  • · Replies 16 ·
Replies
16
Views
2K
Rod colliding with the ground (Special relativity question)
  • · Replies 4 ·
Replies
4
Views
2K
Error calculation in a measurement chain
  • · Replies 7 ·
Replies
7
Views
3K
Is there any friction in this case?
  • · Replies 12 ·
Replies
12
Views
1K
Electric field problem -- Repulsive force between two charged spheres
  • · Replies 5 ·
Replies
5
Views
1K
Compression Q&A: Answers to Common Questions
  • · Replies 11 ·
Replies
11
Views
2K
Coefficient of kinetic friction
  • · Replies 20 ·
Replies
20
Views
3K
DC Motor Efficiency: Why Does Efficiency Plot Look Like Parabola?
  • · Replies 3 ·
Replies
3
Views
2K
Resultant Frequency and Wavelength of Interfering Sound Waves
  • · Replies 5 ·
Replies
5
Views
3K
Solve Motional EMF Problem: Total Resistance, V(ind), I(ind), and Fnet Explained
  • · Replies 6 ·
Replies
6
Views
2K
Possible to use work-energy theorem from a non-inertial frame?
  • · Replies 1 ·
Replies
1
Views
2K
An expression for the vertical velocity as a function of time
  • · Replies 5 ·
Replies
5
Views
2K
TIme needed for a capacitor to reach a fraction of its final charge
  • · Replies 2 ·
Replies
2
Views
2K
Year 10 physics homework problem
  • · Replies 6 ·
Replies
6
Views
2K
Notation in fluid dynamics: A circle with a horizontal bar inside
  • · Replies 2 ·
Replies
2
Views
1K
Earth's Accel.: Is 10^(-22)m/s^2 Correct?
  • · Replies 3 ·
Replies
3
Views
1K
Electrostatics help please -- Electric field, potential
  • · Replies 5 ·
Replies
5
Views
2K
Conductivity and Electric Field relationship
  • · Replies 6 ·
Replies
6
Views
3K
Connection of two photovoltaic cells to produce larger current
  • · Replies 6 ·
Replies
6
Views
2K
Bobsled Impulse and Force -- ELASTIC collision problem
  • · Replies 10 ·
Replies
10
Views
2K
Estimate the following quantities from a graph of the refractive index of NaCl
  • · Replies 9 ·
Replies
9
Views
2K
Trouble finding the current through this resistor in the circuit
  • · Replies 1 ·
Replies
1
Views
1K
MIT 8.01: Unwinding Drum Problem
  • · Replies 9 ·
Replies
9
Views
3K
Problem involving interference and medium with index n
  • · Replies 1 ·
Replies
1
Views
1K
I just wanted to know how to find error/uncertainties from the graph
  • · Replies 20 ·
Replies
20
Views
1K
Acceleration between two frames
  • · Replies 38 ·
2
Replies
38
Views
4K
Calculate force to open a door with a gas spring
  • · Replies 23 ·
Replies
23
Views
6K
How Does the Definition of Work Affect the First Law of Thermodynamics Equation?
  • · Replies 3 ·
Replies
3
Views
2K
How Do You Calculate the New Density of Kr in a Balloon?
  • · Replies 84 ·
3
Replies
84
Views
8K
To calculate the forces on a composite body
  • · Replies 2 ·
Replies
2
Views
2K
Derivation of single slit diffraction formula
  • · Replies 9 ·
Replies
9
Views
3K
Speeds of the rolling ball at different points in this roller coaster track
  • · Replies 6 ·
Replies
6
Views
3K
Interpreting Weird Results: J_u, P_1 and T_1
  • · Replies 5 ·
Replies
5
Views
1K
Understanding the Coriolis Force: How to Calculate It
  • · Replies 1 ·
Replies
1
Views
2K
Confused about which forces are external when Newton's Second Law is used
  • · Replies 8 ·
Replies
8
Views
3K
Hinged rod rotating, falling and hitting a mass
  • · Replies 11 ·
Replies
11
Views
3K
Compensating for Earth's Rotation With v = ωr
  • · Replies 9 ·
Replies
9
Views
2K
Mass matters for standing waves on a string?
  • · Replies 1 ·
Replies
1
Views
1K
Force acting on a charge across a hybrid medium
  • · Replies 2 ·
Replies
2
Views
2K
Inverse-Square Law of Radiation
  • · Replies 17 ·
Replies
17
Views
3K
Solving the Weight Puzzle: Explaining Why and How
  • · Replies 2 ·
Replies
2
Views
2K
Seemingly simple equilibrium problem - force balance
  • · Replies 6 ·
Replies
6
Views
3K
How to determine the same moment of inertia in two different ways?
  • · Replies 3 ·
Replies
3
Views
2K
Proving that the incident intensity is not the same as the sum of others
  • · Replies 1 ·
Replies
1
Views
2K
Dynamics problem about two-dimensional tug-of-war
  • · Replies 5 ·
Replies
5
Views
16K
Using the sin function for a problem with a frictionless pulley and an incline
  • · Replies 8 ·
Replies
8
Views
2K
Understanding the Physics of a=0 in u+at
  • · Replies 6 ·
Replies
6
Views
2K
Do Radio Transmitters cause diffraction?
  • · Replies 11 ·
Replies
11
Views
2K
What is the common error when discussing the photoelectric effect?
  • · Replies 4 ·
Replies
4
Views
1K
Finding acceleration of block with block on top, connected by rope
  • · Replies 6 ·
Replies
6
Views
3K
How Does Current Behave Over Time in AC Circuits?
  • · Replies 3 ·
Replies
3
Views
2K
Speed and direction of proton after collision
  • · Replies 28 ·
Replies
28
Views
3K
Why Does Fleming's Right Hand Rule Give an Upward Force on the Wire?
  • · Replies 4 ·
Replies
4
Views
3K
How can I locate the coordinates of the centroid of a cone in Z?
  • · Replies 12 ·
Replies
12
Views
3K
How to Calculate the Resistance of Nichrome in a Series Circuit with Graphite?
  • · Replies 4 ·
Replies
4
Views
2K
What Quantum fields are in the intergalactic space ?
  • · Replies 8 ·
Replies
8
Views
934
How do dark spot and tiny hole filters affect Fourier optics images?
  • · Replies 4 ·
Replies
4
Views
1K
Integration in angular momentum
  • · Replies 2 ·
Replies
2
Views
1K
Why does it look dark between the distance stars at night?
  • · Replies 59 ·
2
Replies
59
Views
4K
Can I power things even after Zener breakdown?
  • · Replies 4 ·
Replies
4
Views
1K
Mechanical Waves Recorded after an Earthquake
  • · Replies 4 ·
Replies
4
Views
1K
Special relativity, a train and a light pulse
  • · Replies 3 ·
Replies
3
Views
1K
Mass swinging in a horizontal circle on 2 strings
  • · Replies 14 ·
Replies
14
Views
3K
Current density in a wire that is being used to charge a capacitor
  • · Replies 8 ·
Replies
8
Views
2K
How to find the amplitude of oscillations of a string with 5 beads?
  • · Replies 69 ·
3
Replies
69
Views
5K
Labwork Statistics help: Average of averages
  • · Replies 1 ·
Replies
1
Views
1K
Clausius-Clapeyron equation and absorbed heat
  • · Replies 3 ·
Replies
3
Views
2K