# What is Homework physics: Definition and 52 Discussions

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1. ### Electrical engineer

I am an electrical engineer and I like to educate high school physics
2. ### Calculate the spring constant of oscillating mass on a spring colliding with a wall

So I proceed as: Total time for 1 oscillation is 0.2s $$\frac{1}{\sqrt{2}}=\sqrt{2} \sin ({\omega t_1})$$ $$\sqrt{2}=\sqrt{2} \sin ({\omega t_2})$$ Therefore $$\omega t_2=\frac{\pi}{2}$$ $$\omega t_1=\frac{\pi}{6}$$ $$\omega ×2(t_1+t_2)=2×\left( \frac{\pi}{2}+\frac{\pi}{6}\right)$$ Since...
3. ### Confused between the units of a constant and the units of the integral boundary conditions

I want to integrate this function ## \int_{0.8um}^{1.8um} A e^{B/E(x)} \, dx ## But A has a unit as ## 1/cm ##. Should I change ##1/cm## to ##1/um## by multiplying ##1/10^{4}## For this function, I decided to integrate using the online numerical integral, This side . I am just curious that...
4. ### A cylinder with cross-section area A floats with its long axis vertical

Summary: A 5.0- cm -diameter cylinder floats in water. How much work must be done to push the cylinder 11 cm deeper into the water? F =Aρgx A 5.0- cm -diameter cylinder floats in water. How much work must be done to push the cylinder 11 cm deeper into the water? F =Aρgx x being the...
5. ### Min Plane Height to Drop Bomb in Hollow: 335m

A plane is flying 80km/h in horizontal direction and it has to drop a bomb into 30m wide and 30m deep hollow. What is the smallest possible height for the plane to fly above hollow if the bomb successfully hits the bottom? I made a mistake somewhere but not sure where... the correct result is...
6. ### Calculating Time of Flight & Velocity of a Ball Thrown Upwards

Vertical components: dy = 0m ay = 9.8m/s^2 [down] t = 1.34s V1y = required V2y = 0 i first tried to find V1y dy =vi t + 1/2 a t^2 and got V1y = -6.566 then i solved for time of flight dy =vi t + 1/2 a t^2 0 = -6.566t + 4/9t^2 and for 1.34 seconds does this mean the time of flight is the...

34. ### Reduced Density operator in matrix form

Homework Statement I already read book of Quantum Computation and Quantum Information by Nielsen and Chuang according to reduced density operator and I already understand how to do the reduced density using Dirac notation, Ket Bra.Homework Equations [/B] My problem here I want to know the...
35. ### A basic conservation of energy question

The question asks: Uranium nuclei are unstable and decay by emitting a helium nucleus, which contains two protons and two neutrons. Suppose the original nucleus has 92 protons and 146 neutrons before it emits the helium nucleus, and that the helium nucleus has an knknown speed as it departs from...
36. ### Path of a Particle: Find & Solve Questions

Homework Statement Homework Equations Find the path of a particle. What is the general or fundamental way to solve this type of questions ? The Attempt at a Solution I don't know where do i start. I can't able to find a relation between these vectors.
37. ### Time period in harmonic oscillation.

Homework Statement Homework Equations Find Time Period. Find the error in my solution. The Attempt at a Solution Where i am wrong ?
38. ### Angular Momentum of the particle.

Homework Statement Homework Equations Find Angular Momentum. How to find velocity of a particle. The Attempt at a Solution If i differentiate with dt both sides, I'm getting velocity y-component=velocity x-component. Then i feel helpless:cry:
39. ### Falling rotating sphere and displacements

Homework Statement Homework Equations How to locate the point P and C after 0.5s from their initial position ? The Attempt at a Solution Well i don't know whether it would be correct way to start the problem i.e find the centripetal acceleration .
40. ### Meter Bridge: Finding Error in Resistance

Homework Statement Homework Equations How to find error in resistance ? The Attempt at a Solution I found out the resistance without error. But What is the way to figure out an error of an instrument ?
41. ### Calculating Gauge Pressure on a Sphere

Homework Statement Homework Equations What is gauge pressure ? The Attempt at a Solution How to find gauge pressure ?
42. ### Can I Find the Moment of Inertia with Only 8 Equal Parts in My Homework Problem?

Homework Statement http://i.imgur.com/7ZRsVj5.png Homework Equations I can't apply correct method ! The Attempt at a Solution In bigger figure, i cut into 8 equal parts.So , total moment of inertia=8 I But it's wrong ! I know it's wrong because i can't able to find angle between any two...
43. ### Magnetic Field in parallel plate capacitor

Homework Statement A parallel plate capacitor of area 60cm^2 and separation 3mm is charged initially at 90 micro coulomb. If the medium between the plates get slightly conducting and the plate loses charge initially at the rate of 2.5 *10^-8 C per sec then what is the magnetic field between the...
44. ### Is Angular Momentum Conserved in Circular Motion?

Homework Statement A bob of mass m attached to an inextensible string of length l is suspended from a vertical support. The bob rotates in a horizontal circle with an angular speed ω rad/s about the vertical. About the point of suspension : (1) angular momentum changes in direction but not...
45. ### Impulse of force correct here?

Im sure Imma mess this up, probably because I am really tired...but I have a bullet that weights .015kg's and is moving at 285m/s, so 609.18J's as with KE. I hit a 70kg block, penetrates .3048 meters thus exerting 1998.62N's of force, which is a lot of force. .3048/285m/s so 0.00106 seconds...
46. ### Need some help with two Dimensional velocity Vectors

Mod note: Moved from a technical section, so missing the homework template. Hi, I'm struggling to understand this problem. I would normal just wait for class but I'm away traveling for work. The question is as follows. A man has a boat that can travel at 15.0 m/s relative to the water. He...
47. ### Relative Velocity of Ball on Moving Board

Homework Statement A ball rolls with a velocity of 14 mm/s [W] on a board that is being pulled [E 60o N] at 20.0 mm/s. What is the velocity of the ball relative to the floor? b = ball x = board f = floor Homework Equations V_bf = V_bx + V_xf The Attempt at a Solution I tried to work through...
48. ### How to calculate the equivalent resistance using wye delta ?

Homework Statement https://z-1-scontent-sin1-1.xx.fbcdn.net/hphotos-xtf1/v/t34.0-12/12435980_942112312550457_1708451532_n.jpg?oh=b29a5e9b2ff96bbf0e11932d081eb25e&oe=568A9B79 [/B] We need to find the equivalent resistance along A to B ie AB Homework Equations R=(1/R1 + 1/R2+...+1/Rn)^-1 ...
49. ### Potential Difference between two parallel charged plates.

How do we find out the potential difference between two equal and opposite charged (conducting) parallel plates mathematically? Let the charge on a plate be 'Q', Total area of a plate be 'A', the distance between the plates be 'd'. I need a direct mathematical solution please, I've come across...
50. ### How Do You Calculate the Mass of the Plane After Intercepting Luggage?

Homework Statement A plane with an initial velocity of (225m/s ŷ + 325m/s Ẑ) intercepts a 20kg piece of luggage with initial velocity of (-75m/s ŷ - 15m/s Ẑ). After, plane is moving at speed 400 m/s. What is the mass of the plane? Homework Equations momentum y: Mplane(225m/s) + 20kg(-75 m/s) =...