Introductory Physics Homework Help Forum

Free introductory physics homework help step by step from qualified mentors. Algebra and calculus based general physics homework. High school and undergraduate level.

Threads

[Faraday's Law] Power Extraction from Line in a country

  • sgod88
  • · Replies 8 ·
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8

Two balls dropped and thrown from a rooftop hit ground 1.88s apart

  • LastMinute
  • · Replies 6 ·
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6

Forces between 2 parallel wires=>

  • noobie!
  • · Replies 3 ·
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3

Thermodynamic Question (power plant problem)

  • gotrilum
  • · Replies 2 ·
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2

Simple harmonic motion spring question

  • vorcil
  • · Replies 9 ·
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9

Using the Right Hand Rule to Determine Particle Charge

  • Nimmy
  • · Replies 5 ·
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5
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6

Charge on two suspended pith balls in electrostatic equilibrium

  • loka
  • · Replies 12 ·
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12

How Is the Specific Latent Heat of Fusion for Ice Calculated?

  • swede5670
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1

Calculating the Impact of a Hammer on a Lawn

  • loka
  • · Replies 1 ·
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1
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6

How Efficient Can a Heat Engine Be Between 1200 K and 300 K?

  • science.girl
  • · Replies 12 ·
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12

Thermodynamics: Finding Specific Heat of Ice

  • swede5670
  • · Replies 1 ·
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1

Max distance of resolution from 2 point sources of light

  • Cheezay
  • · Replies 1 ·
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1

Where Will the Final Image Be Located in a Two-Lens System?

  • withthemotive
  • · Replies 1 ·
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1

R1 350 Ohms: What Current Flows at 50V?

  • x^2
  • · Replies 3 ·
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3

Finding contact force between two blocks pushed together

  • loka
  • · Replies 1 ·
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1

Roational Inertia of a triangle

  • joserse46
  • · Replies 4 ·
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4

Finding EMF, internal resistance, and power dissipated in a cell circuit

  • swede5670
  • · Replies 10 ·
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10

Finding the capcitance of this capacitator

  • Dell
  • · Replies 13 ·
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13

Finding Period with Double Stars

  • rss14
  • · Replies 1 ·
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1
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1

What Frequencies Form Standing Waves in a Microwave Cavity?

  • holaholayo
  • · Replies 2 ·
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2
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3

How Do Kepler's Laws Explain Satellite Orbits in Simulated Experiments?

  • Miriverite
  • · Replies 1 ·
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1
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R Network- finding total resistance.

  • GDGirl
  • · Replies 2 ·
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2

Fundamental Frequency of Open and Closed Tube

  • veronicak5678
  • · Replies 2 ·
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2

Solve Torque Question: Will Free Point B Go Up?

  • toqp
  • · Replies 1 ·
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1
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1

Calculating Centrifugal Force of a Car on a Curved Road

  • Ry122
  • · Replies 5 ·
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5

Thin film light interference question

  • ia22
  • · Replies 1 ·
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1

What is the difference between an induced emf and a back emf?

  • jayjay112
  • · Replies 2 ·
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2

Elastic Collision: 1kg Object, 0.7kg Object, 0.2s Interval

  • ironhawk316
  • · Replies 1 ·
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1
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13

Why do magnetic poles always occur in north-south pairs?

  • jayjay112
  • · Replies 1 ·
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1

Which Hand Rule Determines Current Direction in Magnetic Fields?

  • jayjay112
  • · Replies 7 ·
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7

Thevenin's equivalent circuit problem

  • backstance
  • · Replies 5 ·
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5

Rocket changing direction by perpendicular gas ejection

  • tamref
  • · Replies 4 ·
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4

What Is the Final Velocity of a Mass Accelerated by a Force?

  • lisafeary
  • · Replies 2 ·
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2
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5

Seperation of the induced charge

  • 385sk117
  • · Replies 2 ·
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2
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1
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8

Pendulum speed with only height from equilibrium

  • Serpentia
  • · Replies 4 ·
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4

Why are voltages across resistor and inductor out of phase in an RL circuit?

  • driedupfish
  • · Replies 1 ·
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1

How Does Charging by Induction Work with a Positive Object?

  • jgens
  • · Replies 1 ·
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1

Air Pressure and Net Force on a Door in a Tornado

  • NPM
  • · Replies 3 ·
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3
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7

What is the net torque on a wheel with given dimensions and direction?

  • aaronb
  • · Replies 4 ·
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4

Centripetal force on amoeba in centrifuge

  • brentwoodbc
  • · Replies 6 ·
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6

Determining Natural Length of a Spring

  • TG3
  • · Replies 2 ·
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2

Calculating Average Intensity of a laser blackboard pointer

  • patelpalak
  • · Replies 5 ·
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5

Work to Stretch Spring from 35cm to 40cm

  • TG3
  • · Replies 2 ·
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2

Solve Circular Motion: Satellite Height, Speed, Location

  • T71979
  • · Replies 2 ·
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2

Heating power of two radiators in parallel and series

  • Finland
  • · Replies 1 ·
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1

What is a Suitable Projectile for a Small Trebuchet?

  • davie08
  • · Replies 1 ·
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1
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12

Solving for Unknown Frequency: Tuning Fork Beats

  • veronicak5678
  • · Replies 2 ·
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2

Why are electric field equations E = Kq/r and E = Kq/r² both used?

  • Air
  • · Replies 13 ·
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13

Where Can I Find Sinusoidal Problems for RC and RL Circuits?

  • m.farrukh
  • · Replies 2 ·
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2

Special Relativity: Why is Length Contraction Inverse of Time Dilation?

  • flooflar
  • · Replies 2 ·
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2

What Is the Distance Traveled by a Disc on a Block Before Coming to Rest?

  • chingcx
  • · Replies 1 ·
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1

How much charge stored in capacitor ?

  • ixtra
  • · Replies 2 ·
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2

Child on merry-go-round: angular and centripetal acceleration

  • heyrefusuck
  • · Replies 3 ·
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3

Tension and acceleration in pulley system with rotating pulley

  • heyrefusuck
  • · Replies 1 ·
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1
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3

Parachutist free fall with drag coefficient change at t=10s

  • platonas1
  • · Replies 3 ·
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3
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Finding the coefficient of kinetic friction using impulse/momentum

  • cjdavis7
  • · Replies 8 ·
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8

What Is the Speed of the Second Puck After a Head-On Collision?

  • lilmissbossy
  • · Replies 5 ·
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5

Thermal Expansion Ethanol Problem

  • Fizzicist
  • · Replies 5 ·
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5

Rotational Mechanics(The concept of spinning)

  • FedEx
  • · Replies 6 ·
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6

Potential difference in parallel - capacitors

  • StuckInPhysic
  • · Replies 6 ·
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6

Impossible heisburg uncertainty question that makes no sense

  • footballfreak
  • · Replies 4 ·
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4

Force exerted on inside of a box by a gas

  • aolson
  • · Replies 4 ·
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4

Calculate Tension in String: m1=4.50 kg, m2=7.50 kg, a=1.4 m/s^2

  • itsmyflow
  • · Replies 2 ·
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2

What is the Minimum Uncertainty in Block's Speed on a Frictionless Surface?

  • footballfreak
  • · Replies 4 ·
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4

Estimate the density of the water

  • kritzy
  • · Replies 4 ·
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4

Object Lifted By Cord (Stress/Tension Problem)

  • kritzy
  • · Replies 3 ·
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3
  • Poll Poll

How to get the critically damped vibration equation

  • zina
  • · Replies 1 ·
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1

Help with Spring Problem - Find a Function & Position at t=pi/12

  • infinityhaiti
  • · Replies 9 ·
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9

Thermodynamic Work: Find w P, V, T Not Constants

  • thejinx0r
  • · Replies 1 ·
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1

Angular position, speed, and acceleration

  • aaronb
  • · Replies 2 ·
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2

Calculating Width of Single Slit Diffraction Pattern

  • phy112
  • · Replies 5 ·
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5
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29

I used to be good at phyics, but

  • aviodont
  • · Replies 31 ·
2
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31

B-field Component of Electromagnetic Wave After Change in Time

  • x^2
  • · Replies 2 ·
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2

What Is the Efficiency of a Monoatomic Ideal Gas Cycle?

  • diegzumillo
  • · Replies 10 ·
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10

Tuning fork frequency in a resonating water tube

  • m.l.
  • · Replies 1 ·
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1

Using energy conservation to find forces between two particles

  • cleggy
  • · Replies 8 ·
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8

Why is the magnetic field zero at the center of a square loop?

  • Nimmy
  • · Replies 5 ·
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5

How Do You Calculate the Radius of a Copper Cable Using Ohm's Law?

  • Malaya
  • · Replies 1 ·
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1

Focal length of her contact lenses

  • phy112
  • · Replies 2 ·
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2

Normal force and friction on a parked car on a 20° slope

  • BATBLady
  • · Replies 3 ·
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3

Calculating Probability of Particle in a Box

  • Kruum
  • · Replies 4 ·
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4

Voltage/current in circuit with two temperature sensors

  • Mårten
  • · Replies 15 ·
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15

Calculating earth's speed using radius and speed of light, etc.

  • DDRchick
  • · Replies 8 ·
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8