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.
Confusion regarding surface tension direction and force balance
  • · Replies 39 ·
2
Replies
39
Views
2K
Convert to Center of Mass Reference Frame
  • · Replies 9 ·
Replies
9
Views
1K
How far from the point of release will the ball hit the ground?
  • · Replies 16 ·
Replies
16
Views
909
Irodov 1.23 confusion: Calculate distance traveled and time elapsed for this decelerating particle
  • · Replies 2 ·
Replies
2
Views
912
What is force? How can we interpret the full definition of force?
  • · Replies 6 ·
Replies
6
Views
864
Calculate velocities in COM reference frame for 2D collision
  • · Replies 27 ·
Replies
27
Views
1K
Inclined plane problem
  • · Replies 13 ·
Replies
13
Views
1K
AP physics 2: Phase change in thin film interference
  • · Replies 1 ·
Replies
1
Views
829
Calculate the speed and angle of the center of mass before a collision
  • · Replies 3 ·
Replies
3
Views
955
Mastering physics homework: Mass oscillating on a vertical spring
  • · Replies 2 ·
Replies
2
Views
741
Friction direction change in a inclined circular bend (car on a road)
  • · Replies 11 ·
Replies
11
Views
1K
Induced current and force on circular loop in varying magnetic field
  • · Replies 4 ·
Replies
4
Views
1K
Problem on Radiation Pressure
  • · Replies 33 ·
2
Replies
33
Views
1K
Quick Physics Questions I found online and need explanations solving
  • · Replies 10 ·
Replies
10
Views
852
Calculate the energy transferred given the voltage, current and time
  • · Replies 5 ·
Replies
5
Views
772
This 3 mass atwood problem is confusing me
  • · Replies 4 ·
Replies
4
Views
1K
Left-to-Right Wave — How Does Particle X Move?
  • · Replies 23 ·
Replies
23
Views
968
Computing the moment of inertia for a rotary inverted pendulum
  • · Replies 5 ·
Replies
5
Views
883
Ball on a string thrown around a spool
  • · Replies 3 ·
Replies
3
Views
940
Network Analysis, Kirchhoff's Laws, changing current source to voltage
  • · Replies 4 ·
Replies
4
Views
1K
Graphs of RC Circuit Responses
  • · Replies 3 ·
Replies
3
Views
1K
The problem of one tube and two balls on a plane
  • · Replies 60 ·
3
Replies
60
Views
3K
Calculating the Forces on a Charge
  • · Replies 7 ·
Replies
7
Views
860
Ambiguous Problem Statement on Determining Speed of Aircraft
  • · Replies 13 ·
Replies
13
Views
2K
How does a transistor act as an amplifier?
  • · Replies 6 ·
Replies
6
Views
907
How do I find the intersection of the wrench's LOA?
  • · Replies 4 ·
Replies
4
Views
1K
Momentum: why don't the two carts become one?
  • · Replies 32 ·
2
Replies
32
Views
1K
How to calculate the errors in the measured period of a pendulum?
  • · Replies 6 ·
Replies
6
Views
789
Series and Parallel Circuits using symmetry
  • · Replies 10 ·
Replies
10
Views
897
How is the slider connected to the switch?
  • · Replies 6 ·
Replies
6
Views
837
Thermal expansion of a glass rod and a metal ruler
  • · Replies 8 ·
Replies
8
Views
855
A problem from a physics national competition
  • · Replies 13 ·
Replies
13
Views
1K
Change in entropy of the surroundings in an irreversible process
  • · Replies 14 ·
Replies
14
Views
1K
Surface current of superconducting sphere in magnetic field
  • · Replies 1 ·
Replies
1
Views
868
Force of car pushing on a truck
  • · Replies 25 ·
Replies
25
Views
1K
Force needed to raise a backpack
  • · Replies 1 ·
Replies
1
Views
804
Uniform circular motion angle relationship
  • · Replies 6 ·
Replies
6
Views
686
Simulating a Rotary Inverted Pendulum in Python
  • · Replies 15 ·
Replies
15
Views
1K
Pressure of water coming out of a hose nozzle
  • · Replies 7 ·
Replies
7
Views
1K
Focal length of the eyepiece lens in a compound microscope
  • · Replies 7 ·
Replies
7
Views
1K
Find the magnitude of the child's acceleration
  • · Replies 7 ·
Replies
7
Views
1K
Why are these forces not included in the solution? (Torque Problem)
  • · Replies 12 ·
Replies
12
Views
1K
Why do compasses always point in the wrong direction?
  • · Replies 6 ·
Replies
6
Views
962
Charge on disk with non uniform surface charge density
  • · Replies 12 ·
Replies
12
Views
1K
Optics problem with a glass lens immersed in water
  • · Replies 3 ·
Replies
3
Views
828
Homework: Can a rest frame be chosen for the center of momentum for a system of two photons?
  • · Replies 7 ·
Replies
7
Views
793
1-dimensional kinematics - final velocity of 2 trains in opposing direction
  • · Replies 3 ·
Replies
3
Views
890
Total energy of a wave on a string
  • · Replies 2 ·
Replies
2
Views
944
What happens to the position of two attracting charges when a conductor is inserted between them?
  • · Replies 4 ·
Replies
4
Views
752
Spring force required to overcome friction between two blocks
  • · Replies 10 ·
Replies
10
Views
908
Rolling without slipping problem
  • · Replies 42 ·
2
Replies
42
Views
3K
Stopping a rod moving with constant omega
  • · Replies 13 ·
Replies
13
Views
957
Handling two SHMs in different directions
  • · Replies 18 ·
Replies
18
Views
972
Sound in an Open Vertical Tube partially filled with Water
  • · Replies 4 ·
Replies
4
Views
903
Best Egg Drop Contest Shock Absorber?
  • · Replies 1 ·
Replies
1
Views
795
Problem involving SHM and a collision
  • · Replies 27 ·
Replies
27
Views
1K
Calculate the velocity of the canoe relative to the water
  • · Replies 8 ·
Replies
8
Views
925
Amplitude of a stretched spring that is stretched further
  • · Replies 6 ·
Replies
6
Views
809
Waves on a String Fixed at the Ends
  • · Replies 7 ·
Replies
7
Views
939
Electric Potential Energy of Point Charge Systems
  • · Replies 2 ·
Replies
2
Views
1K
Landing reusable booster rockets
  • · Replies 35 ·
2
Replies
35
Views
2K
Problem with the power of car
  • · Replies 3 ·
Replies
3
Views
899
Tangential velocity of external satellite
  • · Replies 7 ·
Replies
7
Views
761
Will my weather balloon work in the Stratosphere?
  • · Replies 7 ·
Replies
7
Views
2K
Angular momentum- rotating rod
  • · Replies 17 ·
Replies
17
Views
1K
Transverse mechanical waves in a steel wire
  • · Replies 10 ·
Replies
10
Views
969
Thermodynamics - Dryness fraction Equations
  • · Replies 1 ·
Replies
1
Views
680
Dryness fraction of saturated steam
  • · Replies 2 ·
Replies
2
Views
1K
help whit problem of college admission exam
  • · Replies 5 ·
Replies
5
Views
854
Loop equations for this battery-resistor circuit
  • · Replies 48 ·
2
Replies
48
Views
2K
Work done to insert a point charge 𝑞 at the center of a conducting sphere
  • · Replies 12 ·
Replies
12
Views
1K
Understanding a math step in solving Schrödinger's equation for single particle in a box
  • · Replies 8 ·
Replies
8
Views
1K
Center of mass and momentum- A question about systems
  • · Replies 25 ·
Replies
25
Views
1K
Circle approximation of a wave pulse on a string or spring
  • · Replies 29 ·
Replies
29
Views
1K
Calculating magnetic field outside a solenoid
  • · Replies 15 ·
Replies
15
Views
1K
Aerodynamics: Optimization of an aircraft engine
  • · Replies 2 ·
Replies
2
Views
604
I do not understand why the extra 2 factor is there (energy of 1D electron gas at zero temperature)
  • · Replies 5 ·
Replies
5
Views
918
Rotating ring on a rough surface- but with a twist
  • · Replies 151 ·
6
Replies
151
Views
5K
Electric potential of nested spherical shells
  • · Replies 4 ·
Replies
4
Views
913
Another rotation problem -- Acceleration of a ring rolling on a surface
  • · Replies 1 ·
Replies
1
Views
758
Why is it necessary to start this experiment with the water level at 400mL?
  • · Replies 35 ·
2
Replies
35
Views
2K
Correct statement about light transmitted and reflected by windscreen
  • · Replies 11 ·
Replies
11
Views
1K
Force pulling on a string at an angle with a block at the other end
  • · Replies 2 ·
Replies
2
Views
1K
Confusion about friction in rotating ring
  • · Replies 12 ·
Replies
12
Views
922
Problem n. 7 chapter 4 Eisberg Resnick "Quantum Physics"
  • · Replies 9 ·
Replies
9
Views
769
A block dropping onto a spring system
  • · Replies 58 ·
2
Replies
58
Views
3K
Paper 'helicopter' experiment - Adding Weight Decreases Flight Time?
  • · Replies 20 ·
Replies
20
Views
2K
When are reactive forces enough to support this body?
  • · Replies 14 ·
Replies
14
Views
1K
Can A Vector Have Components Of Say Y or Z in the X-Hat Direction?
  • · Replies 8 ·
Replies
8
Views
948
A problem about momentum and the elastic collision of two particles
  • · Replies 13 ·
Replies
13
Views
2K
Identical Batteries in Parallel do not Draw Same Current, Non-Ideal?
  • · Replies 7 ·
Replies
7
Views
939
Homework assignment that I was able to solve using EDO, but need to use Laplace now
  • · Replies 5 ·
Replies
5
Views
1K
Optimizing strength to weight in balsa wood deck arch truss bridge
  • · Replies 1 ·
Replies
1
Views
945
Displacement amplitude of the faintest sound detectable by a human ear
  • · Replies 28 ·
Replies
28
Views
1K
Designing a speed bump given the maximum vertical wheel acceleration
  • · Replies 18 ·
Replies
18
Views
1K
How do you Calculate Ampacity of a Conductor Geometry?
  • · Replies 64 ·
3
Replies
64
Views
6K
A little annoying doubt -- Initial vertical speed of a jumping flea
  • · Replies 5 ·
Replies
5
Views
798
Calculate the Acceleration of this Car
  • · Replies 7 ·
Replies
7
Views
1K
Two ropes pulling on a cylinder that is translating and rotating on a plane
  • · Replies 2 ·
Replies
2
Views
908
Optical path difference between two reflected rays
  • · Replies 4 ·
Replies
4
Views
743