Spheres Definition and 467 Threads

Two small nonconducting spheres have a total charge of 80 microC. When place 1.06 m apart, the force exerts on the other is 12 N and is repulsive. What is the charge of each. What if the force were attractive? Given: k, F = 12 N if repulsive but F = -12 N if attractive, Q1 + Q2 = 8 x 10^-5 C...

I have a question regarding charged spheres and voltage measurements. I've talked to my physics professor about it, and he wasn't quite sure of the answer (although to be fair, I asked briefly at the end of class.) Imagine that you had a spherical shell, charged to a high potential (for the...

there are 2 probs here. 1) The inner and outer surfaces of a cell membrane carry a negative and positive charge, respectively. Because of these charges, a potential difference of about 0.0680 V exists across the membrane. The thickness of the membrane is 7.95×10-9 m. What is the magnitude of...

Here's a question from my textbook: Two copper spheres, each having a mass of .4 kg, are separated by 2 m. (a) How many electrons does each sphere contain? The atomic mass of copper is 63.5 g/mol, and its atomic number is 29. (b) How many electrons would have to be removed from one sphere...

Heya, this is my first post, I hope it isn't too hard :smile: Alright, the problem goes like this. I put a sphere into a box to be shipped somewhere, it fits perfectly into the box and the sphere has a radius R. Now I have 8 styrofoam spheres that are placed on the corners of the box, find...

HELP HELP HELP! spheres! Consider a solid sphere of radius R containing a total charge Q which is uniformly distributed throughout the volume with a volume charge density rho. a) find the total force exerted by the electrostatic field on the charge in the 'northern hemisphere'. express your...

Hi ppl, ne1 know how to approach this one? Given P(1,4,-1), Q(1,2,-1) and R (3,2,-2), show that PQR is right angled and hence find the equation of the smallest sphere S which passes through P,Q and R. Okay, I got the right angle by showing PQ and QR to be perpendicular with the dot product...

Two concentric spheres of radii 1.65 cm and 19.0 cm, respectively, are given equal but opposite charges of 6.35e-08 C. How much energy is stored in the system (in J)? I know V = U/q where U would be the entire energy stored in the system beacuse it's not in motion. I know q's but I just...

Two spheres with radius of .10 m and a mass of 25 kg are floating in deep space. Their gravitational attraction keeps them in contact. If we go in and manually separate these spheres to a large distance, by how much will the potential energy involved in their interaction increase. Is there...

Two spheres collide and assume that the collision is perfectly elastic. Also --only linear momentum. I have the relationship: (va' - vb') dot N = -(va - vb) dot N Where N is the normal vector at the point of collision. va and vb are initial velocities of object A and B, respectively...

Two small spheres of mass m are suspended from strings of length L that are connected at a common point. One sphere has charge Q, the other has 2Q. The strings make angles (theta1) and (theta2) with the vertical. (a) How are theta1 and theta2 related? (b) Assume theta1 and theta2 are...

If the black hole has infinite capacity to store mass,why,in a case of the sucking up of the sun,why would their(crudely described)sunny-side up expel huge jet streams of flames and heat? Cant they absorb heat energy and UV since they have capacity to collect mass? If it is possible the Black...

Two identical small spheres possessing charges q1 and q2 are separated by distance r. Which charge would produce the greatest inecreas in the electric force between the tow spheres? 1. double charge q1 2. double r 3. double r and q1 4. double r, q1, and q2 I'm pretty sure it's #1

Help! 3 well separted conductin spheres... three well separated conducting spheres of radii 2.5,4cm, and 6.5cm are charged to .04uC, 0.55 uC and 0.3 uC respectively. a) Calculate the voltage at the surface of each sphere(assume a zero voltage at infinity) hint: outside the surface, charged...

Excerpt from: Beicher and Serway, "Physics for Scientists and Engineers with Modern Physics, 5th edition" Chapter 24, Problem 53, part e: A solid insulating sphere of radius a carries a net positive charge 3Q, uniformly distributed throughout its volume. Concentric with...

Lets say we have three spheres all of uniform density and equal mass, However, sphere A has a rotational period of 16h, B has period of 24h and C has period of 48h. So which one has the greatest acceleration (g value) at the poles and at the equator.

Two charged concentric metal spheres have radii of 3.000 cm and 3.500 cm. Calculate the charge in nC on the inner sphere if the radial electric field at a radial distance 3.125 cm is 7.366e+04 N/C. I tried using Gausses law of EA = Q/e0 then after getting Q I would take the average charge...