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1. Spherical Shell Insulator

Received some help from a classmate...apparently when they wrote the online question, they messed around with the units...A LOT. Thanks for all the help, though!
2. Spherical Shell Insulator

Ok, I'll look more at the book and see what happens!
3. Coaxial Cylindrical Conductors

YEA! It worked!!!!!! Thanks so much!
4. Spherical Shell Insulator

I hadn't tried using 5^3 - 4^3, but when I did, I still didn't get the correct answer. The equation of E = rho * volume with charge was given to me by my professor.
5. Coaxial Cylindrical Conductors

The interactive help that comes with the problem stated that I had to calculate the surface charge in order to calculate the linear charge. Also, do I have the right formula for E? And if I don't need the surface charge, from where do I get the linear charge?
6. Infinite Sheets of Charge

It would help if I attached the picture!!! :rolleyes:
7. Infinite Sheets of Charge

1. Homework Statement An infinite sheet of charge, oriented perpendicular to the x-axis, passes through x = 0. It has area density = -3 micro C/m^2. A thick, infinite conducting slab, also oriented perpendicular to the x-axis, occupies the region between x=a and x=b where a = 4 cm and b=5...
8. Coaxial Cylindrical Conductors

I'll try attaching the image, but as for the symbols, I don't have anything that will display them. My computer is a little too old to have packages like Microsoft Equation or anything like that. If it's really a problem, I'll try seeing if I can download something. Also, I'm really not sure...
9. Coaxial Cylindrical Conductors

1. Homework Statement Two coaxial cylindrical conductors are shown. The inner cylinder has radius a = 2 cm, length 10 m, and carries a total charge of Q inner = +8nC. The outer cylinder has an inner radius b = 6 cm, outer radius c= 7 cm, length 10 m, and carries a total charge of Q outer =...
10. Spherical Shell Insulator

1. Homework Statement An insulator in the shape of a spherical shell is shown. The insulator is defined by an inner radius a = 4 cm and an outer radius b = 6 cm and carries a total charge of Q = +9 microC. You may assume that the charge is distributed uniformly throughout the volume of the...
11. Decibels, pressure & displacement amplitudes

I was actually able to finally figure it out. Thanks for the help!
12. Decibels, pressure & displacement amplitudes

Okay, I think I figured out what the pressure amplitude is...but what about the displacement amplitude? Again, I have no means (as far as I can see) of calculating omega or frequency or other factors needed to solve for the amplitude.... Please help! :)
13. Decibels, pressure & displacement amplitudes

1. Homework Statement A jackhammer emits sound at a decibel level of 130 dB. The wavelength of the sound is 1.0 m. What is the linear sound intensity? What is the pressure amplitude? What is the displacement amplitude? 2. Homework Equations Beta = 10 log (I / Io) ...and...
14. Pendulum oscillation

That does look much better. Still can't figure out what I did wrong the first time. Oh well...thanks for the help!
15. Simple Harmonic Motion with 2 beads

I will definitely try the force approach. I can't believe I didn't think of it. I guess I just panicked when I saw the problem. Thanks for all of the input!
16. Pendulum oscillation

First, I solved for omega using the first formula. Then I inserted the values 41.2 and 43.9 (separate equations, of course) as "y", and solved for t from there. I originally had not done the conversions, but even after I did, I still came up with the same answer. My prof didn't actually show...
17. Pendulum oscillation

1. Homework Statement A student decides to use a simple pendulum to check the shutter time of her camera. A meter stick is laid horizontally, and a simple pendulum is set up so that, when it is hanging vertically, the mass falls on the 50.0 cm mark of the meter stick. The pendulum is set...
18. Simple Harmonic Motion with 2 beads

1. Homework Statement A small bead of mass m1 slides without friction in a spherical bowl of radius R. The bead is displaced a height h1 from the bottom of the bowl. A second, more massive bead of mass m2 is displaced a height h2 from the bottom of the bowl opposite the first bead. The two...
19. Exploding projectile

Ohhhh. I don't think I've ever seen those formulas. Thank you!
20. Center of Mass Frame for Elastic Collision

Wow, thank you for all of the help!
21. Exploding projectile

1. Homework Statement A fireworks rocket is fired with a speed of 80 m/s at an angle of 60 degrees above the horizontal. At the highest point of its trajectory, the projectile explodes into two fragments, one three times heavier than the other. The two fragments hit the ground at the same...
22. Center of Mass Frame for Elastic Collision

To what is pi and pf referring? Is that momentum? I'm afraid I'm still a bit lost.
23. Center of Mass Frame for Elastic Collision

1. Homework Statement Two spheres of equal radius and masses 5.00 kg and 15.0 kg are sliding towards each other along the same straight line across a frictionless, horizontal surface. Vi1 = 15.0 m/s and Vi2= -9.00 m/s, respectively. During the collision, 25% of the total initial kinetic...
24. Frictionless pulley and static equilibrium

Theta was not given.
25. Frictionless pulley and static equilibrium

1. Homework Statement Two masses are connected by a string passing over a frictionless pulley. show that for this system to remain in static equilibrium where m1 sin O (theta) > m2 that (static friction coefficient) > or = tan O - m2 / m1 sec O. 2. Homework Equations static friction...
26. Motion in 2D snowball problem

I knew exactly what kinematic equation you were speaking of, thank you for the help. I figured the first part out and received an answer of 12.2 m. However, I am still befuddled as to the second question--if someone is on a path that is 5 m from the barn, how tall must they be to be hit with...
27. Stunt man jumping over cars

Oh, thank you so much. I hate it when the answer is staring me in the face. I appreciate the help!
28. Stunt man jumping over cars

1. Homework Statement A stunt driver sets a jump off a horizontal platform and over ten cars. The height of the platform is 1.25 m, and the total distance of the cars is 20.0 m. Find the minimum speed required to safely clear the cars. 2. Homework Equations x - x initial = velocity X...
29. Motion in 2D snowball problem

1. Homework Statement A snowball picks up speed and rolls of a barn roof angled at 40 degrees from horizontal. The edge of the barn is 15.0 m above the ground, and the snowball has a speed of 7.00 m/s as it leaves the roof. Ignore air effects. How far from the edge of the barn does the...
30. Two objects, position-time graph

Thanks for the help!