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.
Find the tension in the rope PQ
  • · Replies 7 ·
Replies
7
Views
912
How Do You Correctly Cancel Angular Momentum in Physics Problems?
  • · Replies 3 ·
Replies
3
Views
2K
Question about acceleration of free fall
  • · Replies 23 ·
Replies
23
Views
3K
Calculate voltage over capacitor and resistance
  • · Replies 7 ·
Replies
7
Views
1K
Solve the problem involving the velocity - time graph
  • · Replies 3 ·
Replies
3
Views
1K
Question about the energy of 2 blocks with a spring between them
  • · Replies 12 ·
Replies
12
Views
1K
How Is Work Calculated on a Conveyor Belt with Friction?
  • · Replies 53 ·
2
Replies
53
Views
3K
Find the initial velocity ##U##
  • · Replies 3 ·
Replies
3
Views
1K
How Does Energy Transform in a Bungee Jump?
  • · Replies 7 ·
Replies
7
Views
871
2 Masses and a Wheel (with mass)
  • · Replies 6 ·
Replies
6
Views
1K
Horizontal force by block on a beam
  • · Replies 45 ·
2
Replies
45
Views
2K
Calculate the frequency of rotation when a coin flies off a turntable
  • · Replies 8 ·
Replies
8
Views
1K
Trouble solving for end state of two control volumes in a rigid tank
  • · Replies 12 ·
Replies
12
Views
3K
Help again in interpreting a pulley with a spring and a block
  • · Replies 52 ·
2
Replies
52
Views
4K
Find the value of ##T## and distance of particle in the first ##4## seconds
  • · Replies 2 ·
Replies
2
Views
1K
A small disk and a bigger half disk
  • · Replies 9 ·
Replies
9
Views
820
Making sense of sequence of ideas in MIT OCW's 8.02 notes on Faraday
  • · Replies 1 ·
Replies
1
Views
2K
Rotating ball and string Rotational Kinetic Energy?
  • · Replies 6 ·
Replies
6
Views
8K
Why Isn't the Spring Force Sum of Both Ends?
  • · Replies 5 ·
Replies
5
Views
2K
What is the induced magnetic force on this closed current loop?
  • · Replies 12 ·
Replies
12
Views
2K
Calculating the spring force constant K
  • · Replies 14 ·
Replies
14
Views
2K
Determining Inductance L in an LC Circuit
  • · Replies 5 ·
Replies
5
Views
2K
Power, force, velocity and tension...
  • · Replies 38 ·
2
Replies
38
Views
2K
How Do Power, Force, and Velocity Interact?
  • · Replies 14 ·
Replies
14
Views
1K
The ratio between two horizontal speeds in this pendulum arrangement
  • · Replies 1 ·
Replies
1
Views
809
Inelastic collision of two squares
  • · Replies 14 ·
Replies
14
Views
968
Two bodies connected with an elastic thread moving with friction
  • · Replies 6 ·
Replies
6
Views
2K
How to obtain correct negative sign in calculation of motional emf?
  • · Replies 2 ·
Replies
2
Views
1K
Normal force at the base of a ladder
  • · Replies 20 ·
Replies
20
Views
2K
How Does Spring Compression Relate to Energy Changes?
  • · Replies 4 ·
Replies
4
Views
1K
Arrow being fired to centre of target
  • · Replies 6 ·
Replies
6
Views
880
Change in the kinetic energy of a car driving up a hill
  • · Replies 3 ·
Replies
3
Views
966
Horizontal force on hinge is affected by moving the block farther away?
  • · Replies 11 ·
Replies
11
Views
937
Need help interpreting a spring-block problem
  • · Replies 35 ·
2
Replies
35
Views
3K
Force components for mass attached to two springs
  • · Replies 15 ·
Replies
15
Views
2K
Molecular speed distribution - most probable speed V
  • · Replies 13 ·
Replies
13
Views
2K
Which way does this coil turn in a magnetic field?
  • · Replies 2 ·
Replies
2
Views
1K
Compare rotational inertia of 2 paper cups in 2 diff orientations
  • · Replies 12 ·
Replies
12
Views
1K
Are the Force Equations for Rotational Motion Accurate?
  • · Replies 24 ·
Replies
24
Views
1K
Particle projected from above a dome
  • · Replies 38 ·
2
Replies
38
Views
2K
Avg Power in a Rotational Energy/Work Problem
  • · Replies 6 ·
Replies
6
Views
2K
Centripetal force - Ferris wheel... Opposite results
  • · Replies 8 ·
Replies
8
Views
1K
Why Does Light Diminish with a Phase Difference of 5λ?
  • · Replies 6 ·
Replies
6
Views
1K
Rolling Disk: dynamics versus energy analysis
  • · Replies 9 ·
Replies
9
Views
887
How to Calculate Water Leakage in an Inverted Bottle Experiment?
  • · Replies 55 ·
2
Replies
55
Views
4K
What is the time taken by a pulse generated at the bottom of a string to reach the top?
  • · Replies 8 ·
Replies
8
Views
2K
Determine the velocity of a package dropped from a satellite
  • · Replies 6 ·
Replies
6
Views
915
Finding force between solenoid and magnet
  • · Replies 2 ·
Replies
2
Views
847
Elliptical motion in polar coordinates
  • · Replies 10 ·
Replies
10
Views
2K
Why Does Calculating Torque at the Ladder's Contact Point Not Work?
  • · Replies 5 ·
Replies
5
Views
1K
Cantilevered and line-loaded steel beam
  • · Replies 19 ·
Replies
19
Views
2K
Proving the gravitational force of a solid sphere using integration
  • · Replies 5 ·
Replies
5
Views
1K
Escape Velocity from Earth starting from its Centre
  • · Replies 27 ·
Replies
27
Views
2K
Why Is Deriving the Motion Formula for Hoops More Complex?
  • · Replies 4 ·
Replies
4
Views
1K
Electron motion on axis of a charged ring
  • · Replies 7 ·
Replies
7
Views
2K
Work energy theorem problem -- Block sliding up a curved incline
  • · Replies 10 ·
Replies
10
Views
2K
For a translating block with slipping find the maximum force F
  • · Replies 2 ·
Replies
2
Views
1K
Fundamental electrokinetics problem calculation using Ohm's Law
  • · Replies 4 ·
Replies
4
Views
986
Direction of electric field vector on the surface of charged conductor
  • · Replies 9 ·
Replies
9
Views
2K
Rolling Motion (Stone Gets Stuck in a Tire Going Forward)
  • · Replies 10 ·
Replies
10
Views
2K
Resonance of a cube floating on water under external force
  • · Replies 8 ·
Replies
8
Views
1K
Verifying that Newton's Equations are equivalent to the EL equations
  • · Replies 15 ·
Replies
15
Views
2K
Coulomb's law and energy - potential energy
  • · Replies 5 ·
Replies
5
Views
1K
Velocities of four masses | Conservation of Momentum
  • · Replies 7 ·
Replies
7
Views
1K
How Does a Pulley System Affect Scale Readings?
  • · Replies 8 ·
Replies
8
Views
2K
Intensity of central maximum when width of single slit is doubled
  • · Replies 13 ·
Replies
13
Views
2K
Deriving ODEs for straight lines in polar coordinates for a given Lagrangian
  • · Replies 8 ·
Replies
8
Views
2K
Force on rectangular loop by a current in a long straight wire
  • · Replies 4 ·
Replies
4
Views
3K
Net magnetic force on circuit segment due to 2 parallel wires
  • · Replies 6 ·
Replies
6
Views
1K
Measurements Calculation Problem
  • · Replies 3 ·
Replies
3
Views
1K
A massless disk with an embedded particle rolls down an inclined plane
  • · Replies 17 ·
Replies
17
Views
2K
Torque question in Deltoid muscle
  • · Replies 7 ·
Replies
7
Views
2K
Is this projectile motion situation possible?
  • · Replies 6 ·
Replies
6
Views
1K
How did Cavendish find the density of the Earth?
  • · Replies 24 ·
Replies
24
Views
2K
Average momentum of an avalanche
  • · Replies 5 ·
Replies
5
Views
1K
Finding the constants of the general approximate solution to a double pendulum
  • · Replies 1 ·
Replies
1
Views
1K
Calculate the average force on the side walls of a container
  • · Replies 5 ·
Replies
5
Views
1K
Find tension using sum of torque (two strings, one beam, one box)
  • · Replies 2 ·
Replies
2
Views
1K
How do you prove ##\lambda = \frac {2L} {n} ## given only L?
  • · Replies 3 ·
Replies
3
Views
1K
Equation of resistance from given graph
  • · Replies 4 ·
Replies
4
Views
1K
Uniform Circular Motion: A plum-bob makes a 70 degree angle...
  • · Replies 4 ·
Replies
4
Views
1K
Find the distance a particle travels
  • · Replies 15 ·
Replies
15
Views
2K
Finding the x component of position vector
  • · Replies 3 ·
Replies
3
Views
1K
Uniform Circular Motion: Tension Force at Top of Circle
  • · Replies 4 ·
Replies
4
Views
2K
Find the phase difference between these two sine waves
  • · Replies 21 ·
Replies
21
Views
1K
Frames of Reference: Using tie-downs to hold a load on a flatbed truck
  • · Replies 3 ·
Replies
3
Views
955
Phase difference between two light waves of the same frequency
  • · Replies 12 ·
Replies
12
Views
1K
Wave movement and particle movement
  • · Replies 23 ·
Replies
23
Views
1K
Finding focal length from di v. M graph
  • · Replies 1 ·
Replies
1
Views
679
Finding slip-off angle for mass off of sphere?
  • · Replies 7 ·
Replies
7
Views
2K
How Does Impulse Relate to Momentum Change in Physics Problems?
  • · Replies 7 ·
Replies
7
Views
2K
Need help on a energy question: Hockey puck sliding across the ice
  • · Replies 9 ·
Replies
9
Views
1K
Why Do Capacitors Behave Differently in Series and Parallel Configurations?
  • · Replies 20 ·
Replies
20
Views
3K
Effect of different magnetic fields on a magnetic dipole
  • · Replies 25 ·
Replies
25
Views
2K
Planar Coil Rotating in a Magnetic Field
  • · Replies 1 ·
Replies
1
Views
845
Electromagnetism problem: Merging of 2 charged drops of mercury
  • · Replies 2 ·
Replies
2
Views
2K
Need help finding uncertainty for this equation
  • · Replies 23 ·
Replies
23
Views
1K
Find the velocity of the stone just before it hits the ground
  • · Replies 16 ·
Replies
16
Views
2K
Two blocks in contact -- find the force between them
  • · Replies 14 ·
Replies
14
Views
3K
Can You Accurately Compare Bearing Slow Down Functions?
  • · Replies 4 ·
Replies
4
Views
668