Introductory Physics Homework Help Forum

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Free introductory physics homework help step by step from qualified mentors. Algebra and calculus based general physics homework. High school and undergraduate level.
Slope of N - t graph of radioactive decay
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2
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858
Question about Feynman diagram showing annihilation
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4
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850
Coupled oscillator question
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2
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768
Tension in a Two-Crate System on a Frictionless Surface
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7
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858
Forces at play in a pendulum (conceptual doubt)
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7
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733
How do I fix the signs in Faraday's Law in RL Circuit?
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5
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1K
Resistivity calculation from two-probe resistance measurement of sheet
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2
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746
Simple pendulum with moving support
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4
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1K
Change in the unit vectors
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10
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844
Coupled pendulum-spring system
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3
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949
Field transformations in the z-direction
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7
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2K
Pendulum attached to a rotating vertical disk
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2
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1K
The value of the spring constant k that I calculate seems too high
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11
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1K
Understanding the math of definition of electromotive force
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1
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1K
Length of string in a standing wave
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19
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1K
Field due to an electric dipole (Halliday & Resnick, Ch. 27 problem 23)
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3
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575
Understanding a very simply RL circuit
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1
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901
Small oscillations of a simple pendulum placed on a moving block
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3
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73
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4K
Lab Exercise: Measuring "g" using Conservation of Energy
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12
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1K
Kinematics problem from a competition: Will the 2 sliding boxes collide?
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6
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804
Flashing light beacon from Earth reaching spaceship moving away at 0.75c
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5
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625
Rolling Sphere On Incline
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1
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820
Block sliding on a semicircular track with friction
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10
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2K
The maximum reversible work in thermodynamics (2)
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1
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823
Formula derivation connecting vertical water flowrate & horizontal distance moved by a suspended sphere
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7
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207
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9K
Impulse and momentum / work-energy
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5
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886
The maximum reversible work in thermodynamics
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22
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2K
Do you graph the energy levels of a ##1s^1## atom the same as a ##1s^2## atom?
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12
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983
Magnetic dipole moment and integration surfaces (Introductory Electromagnetics - Magnetistatics)
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4
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952
Charge on a grounded conducting sphere in a uniform electric field, after ungrounding and movement
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1
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1K
Conservation of momentum (center of mass) in projectile launches
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15
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2K
Range of frequency heard by observer related to Doppler effect
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8
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1K
Vertical displacement with time of a projectile
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2
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48
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4K
Spring Constant Force Problem Help
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12
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885
Is current flowing into a battery always equal to current flowing out?
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12
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1K
Total Internal Reflection and Transmitted Wavelength
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1
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947
Understanding self-inductance in a solenoid.
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3
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2K
Condition for resolution of two point sources of light
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2
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837
How do I model this function? (Damped Harmonic Motion)
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19
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1K
Emf in coil rotating inside magnetic field
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3
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903
Refraction of light when traveling from air to glass
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6
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1K
Finding critical angle: not sure which one is correct
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13
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974
Origin of repulsive force on a magnet approaching conducting ring?
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5
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1K
A wheel of radius r rolls along a curve
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13
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1K
Electronic Circuits - Calculate voltage
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4
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1K
Newton's third law and weight
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13
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1K
Query related to Two-Dimensional Motion
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9
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1K
Camera drone and speed of air below it
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5
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977
Graph of viscous force and velocity
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15
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1K
Projectile motion, initial height and range given, find initial velocity
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8
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2K
Need to derive a formula for the number of red giants
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8
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1K
Question about time dilation
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22
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1K
Derive trig equations 4, 5, and 6 from 1, 2, and 3
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13
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3K
Friction - same direction as motion?
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10
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2K
Center of mass acceleration for an inclined plane and mass m
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18
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1K
How Much Vertical Acceleration Does a Jet Need to Avoid a Hill?
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2
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660
How Does Coriolis Force Influence Particle Motion in Rotating Systems?
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3
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1K
2 Masses attached by a spring in the vertical axis
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8
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1K
Minimum work done to push the cube over
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14
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1K
Gauss' Law for a conducting / non-conducting sheet
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5
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2K
Is the Charge Conservation Correct in This Meson Decay Feynman Diagram?
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8
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1K
Find the value of ##t## when ##P## returns to ##X##- Kinematics
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25
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2K
Find the tension in the rope PQ
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7
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775
How Do You Correctly Cancel Angular Momentum in Physics Problems?
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3
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1K
Question about acceleration of free fall
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23
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2K
Calculate voltage over capacitor and resistance
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7
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1K
Solve the problem involving the velocity - time graph
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3
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951
Question about the energy of 2 blocks with a spring between them
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12
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872
How Is Work Calculated on a Conveyor Belt with Friction?
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2
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2K
Find the initial velocity ##U##
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3
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982
How Does Energy Transform in a Bungee Jump?
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7
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715
2 Masses and a Wheel (with mass)
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6
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933
Horizontal force by block on a beam
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2
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2K
Calculate the frequency of rotation when a coin flies off a turntable
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8
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1K
Trouble solving for end state of two control volumes in a rigid tank
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12
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2K
Help again in interpreting a pulley with a spring and a block
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2
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3K
Find the value of ##T## and distance of particle in the first ##4## seconds
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2
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1K
A small disk and a bigger half disk
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9
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681
Making sense of sequence of ideas in MIT OCW's 8.02 notes on Faraday
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1
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2K
Rotating ball and string Rotational Kinetic Energy?
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6
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8K
Why Isn't the Spring Force Sum of Both Ends?
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5
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1K
What is the induced magnetic force on this closed current loop?
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12
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Calculating the spring force constant K
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14
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2K
Determining Inductance L in an LC Circuit
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5
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2K
Power, force, velocity and tension...
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2
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38
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2K
How Do Power, Force, and Velocity Interact?
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14
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846
The ratio between two horizontal speeds in this pendulum arrangement
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1
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697
Inelastic collision of two squares
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14
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780
Two bodies connected with an elastic thread moving with friction
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6
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1K
How to obtain correct negative sign in calculation of motional emf?
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2
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Normal force at the base of a ladder
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20
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2K
How Does Spring Compression Relate to Energy Changes?
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4
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832
Arrow being fired to centre of target
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6
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725
Change in the kinetic energy of a car driving up a hill
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3
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841
Horizontal force on hinge is affected by moving the block farther away?
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11
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783
Need help interpreting a spring-block problem
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2
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35
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2K
Force components for mass attached to two springs
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15
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1K
Molecular speed distribution - most probable speed V
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13
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1K
Which way does this coil turn in a magnetic field?
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2
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880
Compare rotational inertia of 2 paper cups in 2 diff orientations
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1K