# Search results

1. ### Exploding projectile problem!

Can you give me more detail on how this parabolic path can be done? I have worked out the conservation of momentum but couldn't find a way to get the direction of m2. Before the explode: Eo = 1/2 (m1 + m2) (vo)^2 => (vo)^2 = 2 Eo / (m1 + m2) vy = 0 vx = vo * cos(45) = \sqrt{}Eo / (m1...
2. ### Exploding projectile problem!

Exactly. because it's moving. That's why the formula is NOT a static problem. Setting it up is HARD because of that! You have to set it up as a derivative formula so it can change at different time. For all my classes at this level, there is no such thing as horizontal or vertical anymore. It's...
3. ### Exploding projectile problem!

Fire at angle 45 degree. Initial kinetic energy = Eo At top of projectile explode with addtional energy Eo into 2 fragment. 1. Mass = m1, go straight down. 2. Mass = m2, direction: unknown. Question: 1. Velocity (mag and dir) of m2 2. Velocity of m1 3. What's ratio m1/m2 when m1 is...
4. ### Temperature of Bulb Filament

Problem is ez. You have found the R. That's good! Look at this website to know more about the coefficent. You will figure out. http://hyperphysics.phy-astr.gsu.edu/hbase/electric/restmp.html
5. ### Exploding projectile problem!

Sorry but I don't see how can you start the problem with that! It's not like the right hand side of conservation of momentum have the variable vo. Beside I know exactly that this problem does not start from conservation of momentum formula. It got to start from conservation of center of mass...
6. ### Exploding projectile problem!

huh? And why would I want to find that? Cos(45) x vo??? For what? Note that this problem is not a simple x and y direction! It's the conservation of center of mass, conservation of momentum and conservation of energy! I just don't know how to use it correctly!
7. ### Exploding projectile problem!

Homework Statement Fire at angle 45 degree. Initial kinetic energy = Eo At top of projectile explode with addtional energy Eo into 2 fragment. 1. Mass = m1, go straight down. 2. Mass = m2, direction: unknown. Question: 1. Velocity (mag and dir) of m2 2. Velocity of m1 3. What's...
8. ### Electromagnetism question (Stump book) - Dielectric!

So basically it will be the same as point charge above the disk? E = k * P * 20 * pi * h2 * z / (100h2+z2)3/2) It's on the z direction and k = 1/(4*pi*ep0) Since P = dipole moment / Volume
9. ### Electromagnetism question (Stump book) - Dielectric!

So... a. Electric field will be loop from top to bottom of the cyclinder. Inside will be arrow from bot to top. Correct? Since they both have the same direction. b. How do you find the electric field inside the cylindrical? I know p = alpha * E -- Gauss law, E * A = Charge density * Volume...
10. ### Classical Physics question!

Oh so the compass lay on the horizontal direction. I thought it would be something in the z-direction too. Thanks!
11. ### Classical Physics question!

Gradient of z = (2y - 6x -18 , 2x - 8y +28, 0) If I put x = y = 1 there, the answer would be (a,b,0) which is a straight line parrallel to z-axis. That doesn't make sense at all!
12. ### Electromagnetism question (Stump book) - Dielectric!

Ok this book is very common. It's the question number 6.5 A dielectric object that has a quasi-permanent polarization when the applied field is 0 is called an electret. Consider a uniformly polarized electret in the shape of a cylinder of height h and radius 10h. The polarization in the...
13. ### Classical Physics question!

Equation of the height of the hill z = 2xy - 3x^2 -4y^2 -18x + 28y +12 z: Height of the hill x: Distance East y: distance South Question: In which compass direction is the slope at x = y = 1 steepest? My question: What does this suppose to mean? The vector that is tangent to that...