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.
Electric field of a charged disc with a small circle cut out of it
  • · Replies 9 ·
Replies
9
Views
1K
Block tied to a fixed string on an accelerating wedge
  • · Replies 37 ·
2
Replies
37
Views
3K
Use of imaginary charge vs Gauss' law
  • · Replies 12 ·
Replies
12
Views
1K
Relation between the velocity vector and the acceleration vector of an object
  • · Replies 1 ·
Replies
1
Views
858
Issue deriving the third law of thermodynamics
  • · Replies 11 ·
Replies
11
Views
1K
First Law of Thermo: Audience body heat warming a concert hall
  • · Replies 25 ·
Replies
25
Views
2K
Rotational Dynamics problem with instantaneous frame of reference
  • · Replies 6 ·
Replies
6
Views
874
Distribution of Energy when work is done on a system of 2 masses connected by a spring
  • · Replies 17 ·
Replies
17
Views
2K
What Does -∂V/∂x Represent in Newton's Law?
  • · Replies 2 ·
Replies
2
Views
2K
How to approach this question using SUVAT equations?
  • · Replies 8 ·
Replies
8
Views
928
Confused about kinematic equations
  • · Replies 20 ·
Replies
20
Views
3K
What is the relationship between tire size and pressure changes?
  • · Replies 13 ·
Replies
13
Views
1K
Moment of Inertia of Solid Sphere - Proof
  • · Replies 3 ·
Replies
3
Views
6K
Reading of Ammeter for this circuit with Voltage Controlled Resistors
  • · Replies 9 ·
Replies
9
Views
1K
Relation between Friction, Velocity, and Acceleration
  • · Replies 16 ·
Replies
16
Views
1K
Is this statement acceptable? (time derivative of a rotating vector)
  • · Replies 4 ·
Replies
4
Views
832
Entropy Change For Van Der Waals Gas
  • · Replies 5 ·
Replies
5
Views
690
Maximum Power dissipated at load resistor
  • · Replies 3 ·
Replies
3
Views
1K
Poiseuille law and friction force help
  • · Replies 5 ·
Replies
5
Views
735
Reversible, adiabatic expansion - Entropy Change
  • · Replies 5 ·
Replies
5
Views
915
Linear momentum but quadratic kinetic energy?
  • · Replies 4 ·
Replies
4
Views
645
Are there two downward forces acting on the pivot of the rotating rod?
  • · Replies 67 ·
3
Replies
67
Views
4K
Thermodynamics: Violating Clausius => Violating Kelvin
  • · Replies 10 ·
Replies
10
Views
974
The motion of a skateboarder along and above a ramp
  • · Replies 2 ·
Replies
2
Views
740
Deriving the particle's motion using numerical integration
  • · Replies 5 ·
Replies
5
Views
884
Circular motion, coin on a rotating disk
  • · Replies 2 ·
Replies
2
Views
926
Angular velocity- A toy train rolls around a horizontal track
  • · Replies 8 ·
Replies
8
Views
1K
Energy stored in the steady state circuit
  • · Replies 7 ·
Replies
7
Views
935
Solving Kinematics Problem: V_o & Max Height
  • · Replies 7 ·
Replies
7
Views
3K
Additivity of thermodynamic potentials?
  • · Replies 1 ·
Replies
1
Views
571
Two Forces Acting Simultaneously
  • · Replies 6 ·
Replies
6
Views
942
Electric field of a finite linear distribution of charge
  • · Replies 18 ·
Replies
18
Views
1K
Conversion factor when converting from SI to natural units
  • · Replies 1 ·
Replies
1
Views
1K
How do I calculate forces in a truss cross section?
  • · Replies 2 ·
Replies
2
Views
796
Clausius' Theorem and Entropy
  • · Replies 8 ·
Replies
8
Views
963
Circular argument? Justification of equipotential points
  • · Replies 16 ·
Replies
16
Views
1K
Is My Calculation of Work Along a Defined Curve Correct?
  • · Replies 4 ·
Replies
4
Views
817
Thermodynamics of a Heat Engine - (First/Second Law)
  • · Replies 2 ·
Replies
2
Views
717
Finding the distance of a peg so that a pendulum can circle around it
  • · Replies 2 ·
Replies
2
Views
1K
Energy of springs connected in series and parallel
  • · Replies 13 ·
Replies
13
Views
1K
The specific work done on an ideal gas during an adiabatic process in a piston-cylinder system
  • · Replies 13 ·
Replies
13
Views
1K
Relative electrical energy consumption for different light bulb color temperatures
  • · Replies 3 ·
Replies
3
Views
788
Frequency of Reflected light in special relativity
  • · Replies 1 ·
Replies
1
Views
648
Confusion about work done by a gas - Thermodynamics
  • · Replies 15 ·
Replies
15
Views
2K
Thermal exchange between warm object and ideal gas
  • · Replies 2 ·
Replies
2
Views
977
Thermodynamics: Two gases in a container
  • · Replies 1 ·
Replies
1
Views
781
Show that the radius of the exoplanet is about 1/2 of Earth’s radius
  • · Replies 2 ·
Replies
2
Views
973
Total Energy vs Average Energy (Thermo)
  • · Replies 11 ·
Replies
11
Views
1K
Electric flux from line charge through plane strip
  • · Replies 7 ·
Replies
7
Views
6K
Investigation into electric guitar pickups
  • · Replies 4 ·
Replies
4
Views
3K
Electric field created by point charges
  • · Replies 6 ·
Replies
6
Views
1K
Confusion about applying Faraday's law to a circuit
  • · Replies 3 ·
Replies
3
Views
1K
What's the energy stored in a parallel plate capacitor?
  • · Replies 14 ·
Replies
14
Views
2K
Mass Pulley and torque -- Confusion in this Atwood machine problem
  • · Replies 11 ·
Replies
11
Views
1K
Derive Gravitational Force and Field between two identical rods
  • · Replies 1 ·
Replies
1
Views
558
A particle slides down a non-fixed hemisphere
  • · Replies 3 ·
Replies
3
Views
1K
Two spring-coupled masses in an electric field (one of the masses is charged)
  • · Replies 1 ·
Replies
1
Views
1K
Find the equivalent resistance of this circuit
  • · Replies 31 ·
2
Replies
31
Views
4K
How Do I Draw a Decay Scheme in Radiochemistry?
  • · Replies 1 ·
Replies
1
Views
908
Determine the type of measurement by classification
  • · Replies 2 ·
Replies
2
Views
646
Rope tension problem: Mass hanging from a rope tied at an angle
  • · Replies 21 ·
Replies
21
Views
1K
Potential in spherical shells
  • · Replies 2 ·
Replies
2
Views
910
Internal Resistance Affect the Balancing Length in a Potentiometer?
  • · Replies 12 ·
Replies
12
Views
1K
Robot starts to overturn when reaching to pick up a load
  • · Replies 2 ·
Replies
2
Views
706
Distance rolled of sphere vs cylinder with same m, r, and v
  • · Replies 5 ·
Replies
5
Views
982
Determine energy required to stop rolling mass
  • · Replies 10 ·
Replies
10
Views
870
Required force for sphere start rolling
  • · Replies 2 ·
Replies
2
Views
875
Conservation of String Exercise
  • · Replies 5 ·
Replies
5
Views
846
Reflection and Transmission of String Waves
  • · Replies 8 ·
Replies
8
Views
2K
Tension in a rope hanging between 2 trees
  • · Replies 24 ·
Replies
24
Views
2K
How do I calculate the Tension in a rope going over a smooth pulley?
  • · Replies 19 ·
Replies
19
Views
2K
Liquid rocket engine excercise
  • · Replies 1 ·
Replies
1
Views
1K
Connecting a number of EMF sources in a circle to form a circuit
  • · Replies 9 ·
Replies
9
Views
1K
Friction force on a ball falling through a body of water
  • · Replies 9 ·
Replies
9
Views
1K
Is the Trigonometric Analysis of Conveyor Belt Forces Correct?
  • · Replies 6 ·
Replies
6
Views
777
Gradient and Divergence in spherical coordinates
  • · Replies 3 ·
Replies
3
Views
1K
Making a vehicle go straight on carpet
  • · Replies 8 ·
Replies
8
Views
862
A Braking System with Spikes for Cars
  • · Replies 4 ·
Replies
4
Views
887
Torque on a Circular Current Loop under a Misaligned Magnetic Field
  • · Replies 1 ·
Replies
1
Views
1K
Rod with Current on Rails in Magnetic Field
  • · Replies 12 ·
Replies
12
Views
2K
A problem in applying Kirchhoff's Voltage Law
  • · Replies 1 ·
Replies
1
Views
1K
Body attached to a block by a spring, shaped like an inclined plane
  • · Replies 1 ·
Replies
1
Views
1K
Ball revolving around a massive disc and a cube placed at centre
  • · Replies 1 ·
Replies
1
Views
957
A cylinder rotating on a plane with friction and then moving across a frictionless plane to a collision
  • · Replies 1 ·
Replies
1
Views
987
Finding the intermediate height of a ball in terms of its maximum height
  • · Replies 3 ·
Replies
3
Views
973
Time taken for a planet to collide with the Sun
  • · Replies 10 ·
Replies
10
Views
1K
Why is there no current flow in the middle branch? (Circuits problem)
  • · Replies 8 ·
Replies
8
Views
1K
Temperature dependence of resistance
  • · Replies 6 ·
Replies
6
Views
1K
Find the density of surface charges at the boundary of two conductors with different resistivities
  • · Replies 6 ·
Replies
6
Views
2K
Trying to tie two runners of different speeds over a race
  • · Replies 30 ·
2
Replies
30
Views
2K
Can Energy Conservation Solve the Angular Velocity Problem?
  • · Replies 6 ·
Replies
6
Views
976
How do we represent a triangle wave for input voltage in this circuit?
  • · Replies 3 ·
Replies
3
Views
915
Why is Radial Acceleration Ignored for a Rotating Board?
  • · Replies 9 ·
Replies
9
Views
1K
Concept of different accelerations on rotations of rigid bodies
  • · Replies 10 ·
Replies
10
Views
1K
Relativistic Decay and Separation Between Moving Nuclei A and B
  • · Replies 1 ·
Replies
1
Views
716
Looking for observed rotation periods of various Foucault pendulums at different latitudes
  • · Replies 6 ·
Replies
6
Views
1K
Textbook 'The Physics of Waves': Varying Force Amplitude
  • · Replies 3 ·
Replies
3
Views
1K
Expression for magnitude of the constant friction force
  • · Replies 7 ·
Replies
7
Views
1K
Energy conservation equation to find equation for final velocity
  • · Replies 4 ·
Replies
4
Views
1K
How Many Eggs to Turn a 40lb Flywheel in a Vacuum?
  • · Replies 10 ·
Replies
10
Views
1K