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.
Radioactive Decay: 56Co to 56Fe - Which Type of Beta Decay?
  • · Replies 4 ·
Replies
4
Views
2K
Solving Circular Motion: Train Slows from 90 to 50 km/h
  • · Replies 3 ·
Replies
3
Views
2K
Free energy from Thorium to Radon
  • · Replies 1 ·
Replies
1
Views
2K
Average Speed - isn't this average velocity?
  • · Replies 3 ·
Replies
3
Views
2K
Calculate Length of Steel Above Surface in Steel Cylinder Floating in Mercury
  • · Replies 16 ·
Replies
16
Views
2K
Coal Car and horizontal impulse
  • · Replies 5 ·
Replies
5
Views
4K
Center of Mass: Plate with hole
  • · Replies 1 ·
Replies
1
Views
6K
Pile driver - Conservation of enegy
  • · Replies 14 ·
Replies
14
Views
7K
What Beat Frequency Results from Unequal Tensions in Piano Strings?
  • · Replies 6 ·
Replies
6
Views
5K
Hole in a container and its distance from the bottom
  • · Replies 6 ·
Replies
6
Views
6K
What is the velocity of gasoline in a siphon tube after opening?
  • · Replies 5 ·
Replies
5
Views
4K
Young's modulus of copper by projecting a laser
  • · Replies 2 ·
Replies
2
Views
3K
How can trigonometry be used to calculate distance in physics problems?
  • · Replies 4 ·
Replies
4
Views
3K
Measuring gravitational acceleration in a vacuum
  • · Replies 3 ·
Replies
3
Views
2K
Solving Pressure of Syringe Homework Statement
  • · Replies 2 ·
Replies
2
Views
24K
Force and flow speed of a syringe
  • · Replies 6 ·
Replies
6
Views
20K
Cart, Incline, Pulley, and a messed up Acceleration.
  • · Replies 5 ·
Replies
5
Views
3K
Use of potentiometer or rheostat to determine resistance – need clarification
  • · Replies 1 ·
Replies
1
Views
4K
What Are the Key Physics Concepts Behind How Cameras Work?
  • · Replies 1 ·
Replies
1
Views
2K
Solve Friction on an Angle with 7.0kg Mass: u=0.2
  • · Replies 1 ·
Replies
1
Views
2K
How Much Work Does a Plane's Engine Perform to Reach 3200m at 65m/s?
  • · Replies 3 ·
Replies
3
Views
3K
Rotational Kinetic Energy - Clarification on what I need to solve for
  • · Replies 2 ·
Replies
2
Views
2K
What is the mass density of a submerged cylinder?
  • · Replies 7 ·
Replies
7
Views
13K
How Long Does It Take for a Car to Catch Up to a Truck?
  • · Replies 1 ·
Replies
1
Views
988
Derive a general formula for finding range with a spring launcher
  • · Replies 13 ·
Replies
13
Views
5K
Thermal Radiation Homework: Ranking Objects of Same Material
  • · Replies 1 ·
Replies
1
Views
3K
Inclined plane and inclined force-acceleration
  • · Replies 3 ·
Replies
3
Views
6K
Stress and Strain, simple question Just need a clarification
  • · Replies 3 ·
Replies
3
Views
7K
How Do You Calculate the Tension in a String Lifting an Accelerating Mass?
  • · Replies 2 ·
Replies
2
Views
2K
What is the submarine’s maximum safe depth?
  • · Replies 3 ·
Replies
3
Views
7K
Why Does an Athlete Seem to Hang in the Air During a Vertical Jump?
  • · Replies 4 ·
Replies
4
Views
5K
Inelastic collision of snadwiches
  • · Replies 5 ·
Replies
5
Views
4K
One-dimensional motion with w/ aceleration dependant on speed.
  • · Replies 3 ·
Replies
3
Views
3K
Tank and a hole in it whats the speed?
  • · Replies 7 ·
Replies
7
Views
2K
Finding Revolutions per Second of Electron & Proton in Magnetic Field
  • · Replies 5 ·
Replies
5
Views
5K
What is the induced current in a moving frame near a changing current wire?
  • · Replies 14 ·
Replies
14
Views
2K
Block and bullet collision problem
  • · Replies 7 ·
Replies
7
Views
3K
Speed of car down hill with same power as up.
  • · Replies 6 ·
Replies
6
Views
4K
Positively charged side with induced emf
  • · Replies 4 ·
Replies
4
Views
2K
Circular Motion Homework: Radial & Tangential Accel, Total Accel
  • · Replies 8 ·
Replies
8
Views
2K
Find Acceleration with only Initial Velocity and Final position?
  • · Replies 6 ·
Replies
6
Views
30K
What is the Minimum Force Required to Inject into a Vein Using a Syringe?
  • · Replies 2 ·
Replies
2
Views
4K
Aim of Refraction Practical Using Snell's Law
  • · Replies 7 ·
Replies
7
Views
2K
How to Determine the Upward Acceleration of a Mass in a Pulley System?
  • · Replies 3 ·
Replies
3
Views
17K
Calculating the speed of sound in air
  • · Replies 2 ·
Replies
2
Views
2K
find the magnitude and direction of the final velocity
  • · Replies 3 ·
Replies
3
Views
12K
A complex question which has mass, time and acceleration involved
  • · Replies 4 ·
Replies
4
Views
2K
What is the Average Velocity Vector of a Clock's Minute Hand?
  • · Replies 2 ·
Replies
2
Views
12K
Two basic physics 11 wave questions
  • · Replies 2 ·
Replies
2
Views
3K
Determine the dielectric constant
  • · Replies 1 ·
Replies
1
Views
2K
Applying Newton's Laws: Crate on an Inclined Ramp
  • · Replies 6 ·
Replies
6
Views
4K
Range of mass so the body won't move
  • · Replies 1 ·
Replies
1
Views
2K
Determining Acceleration of Pulley System w/ Friction
  • · Replies 1 ·
Replies
1
Views
2K
Calculate angles from axis with a 3d vector
  • · Replies 5 ·
Replies
5
Views
20K
Help Needed: Urgent Calculus Project - When the World Will End
  • · Replies 4 ·
Replies
4
Views
3K
What rate does water flow through the pipes?
  • · Replies 5 ·
Replies
5
Views
5K
Calculating Pressure at the Bottom of a Tank Using Density and Volume
  • · Replies 36 ·
2
Replies
36
Views
19K
Which Jet Ski Crosses the River Faster?
  • · Replies 16 ·
Replies
16
Views
6K
What am I doing wrong?: Buoyancy of an Object Homework Question
  • · Replies 3 ·
Replies
3
Views
2K
Electrostatics: Two charged balls with attraction
  • · Replies 8 ·
Replies
8
Views
2K
How Do You Calculate Energy and Speed of a Roller Coaster at Different Points?
  • · Replies 1 ·
Replies
1
Views
10K
Earth & moon rotate round center of mass
  • · Replies 8 ·
Replies
8
Views
4K
Calculate Pressure Gauge Reading in Wide Section of Pipe
  • · Replies 2 ·
Replies
2
Views
4K
Equilibrium of a compound object
  • · Replies 3 ·
Replies
3
Views
2K
How Does Moving a Metal Rod in a Magnetic Field Induce Current?
  • · Replies 13 ·
Replies
13
Views
9K
Long Jump problem with only distance and height given
  • · Replies 7 ·
Replies
7
Views
6K
Solving the Speed of a Projectile Passes an Observation Satellite
  • · Replies 22 ·
Replies
22
Views
7K
How Does Photon Wavelength Affect Electron Ejection and Metal Work Function?
  • · Replies 8 ·
Replies
8
Views
9K
D) T1 - T2 = m1g + qE1 = m2g - qE2 Solving Magnetism Question Homework
  • · Replies 8 ·
Replies
8
Views
7K
Classroom Demo of Coherent Light Beam on Slits: Find Fringe Distance
  • · Replies 7 ·
Replies
7
Views
7K
Two particles collide and form a new particle
  • · Replies 22 ·
Replies
22
Views
9K
Calculating direction of travel on a clock face
  • · Replies 6 ·
Replies
6
Views
2K
How to Determine the Depth of an Ice Cube Floating in Water?
  • · Replies 5 ·
Replies
5
Views
6K
Motion in 2D Question: Solving for Time and Impact of a Thrown Stone
  • · Replies 2 ·
Replies
2
Views
2K
Complex Pulley System (five different pulleys)
  • · Replies 3 ·
Replies
3
Views
18K
Potential vs Kinetic Energy: Proton-Hydrogen Deflection
  • · Replies 2 ·
Replies
2
Views
1K
Find position after t for simple harmonic motion
  • · Replies 4 ·
Replies
4
Views
5K
How Many Water Molecules in a Glass?
  • · Replies 1 ·
Replies
1
Views
3K
How Much Does the Rope Stretch When a Circus Performer Hangs at Rest?
  • · Replies 2 ·
Replies
2
Views
5K
Magnetic Interactions vector diagram
  • · Replies 26 ·
Replies
26
Views
11K
Photoelectric Effect: Which Answer is Correct?
  • · Replies 2 ·
Replies
2
Views
3K
Light Intensity Homework: Solve for Unknown Intensity
  • · Replies 1 ·
Replies
1
Views
2K
Simple Vector Problem - Finding the x-component
  • · Replies 4 ·
Replies
4
Views
33K
Exact Energy usage in an AC-R circuit
  • · Replies 3 ·
Replies
3
Views
2K
U-235 Fission in Nuclear Reactor: Calculating Atom & Kg Usage/sec
  • · Replies 3 ·
Replies
3
Views
2K
Find max energy stored in oscillating system
  • · Replies 1 ·
Replies
1
Views
4K
How Does Newton's Third Law Apply Here?
  • · Replies 2 ·
Replies
2
Views
3K
Rocket trajectory in vertical launch then free fall
  • · Replies 1 ·
Replies
1
Views
2K
Elastisity: Hooke's Law Finding Spring Compression
  • · Replies 4 ·
Replies
4
Views
9K
What Went Wrong? Calculating the Max Height of a Projectile at a 30 Degree Angle
  • · Replies 3 ·
Replies
3
Views
2K
De Broglie wavelength (relativistic e-)
  • · Replies 3 ·
Replies
3
Views
15K
How is theta obtained when using torque = F*r*sin(theta)?
  • · Replies 2 ·
Replies
2
Views
28K
A balloon and a springfind extension
  • · Replies 2 ·
Replies
2
Views
3K
Time taken to reach the water's surface
  • · Replies 2 ·
Replies
2
Views
2K
How Do You Calculate Rocket Initial Velocity Using Acceleration and Time?
  • · Replies 6 ·
Replies
6
Views
5K
Newton's 3rd Law and Acceleration
  • · Replies 8 ·
Replies
8
Views
4K
How does temperature affect the volume of air?
  • · Replies 7 ·
Replies
7
Views
7K
What value of the velocity should I insert in the equation?
  • · Replies 3 ·
Replies
3
Views
2K
How Much Heat is Needed to Melt 24.0 kg of Ice?
  • · Replies 4 ·
Replies
4
Views
6K
How Far Should a 5.6 kg Box Be Placed for Balance?
  • · Replies 1 ·
Replies
1
Views
3K