Recent content by ndoc

Homework Statement The coaxial cable from a television or other device has an inner conductor with diameter of 1 mm and the shield of diameter 5 mm. Assume a plausible value for the dielectric constant (3 ≤ κ ≤ 5) of the dielectric separating the two conductors and calculate the capacitance...

right so these are my numbers: 4*pi*(-163)*(8.85x10^-12)*(6.37x10^6)^2 but this produces a wrong answer (has to be within about 97% accuracy) of -735562.52C or -735.56 kC

Homework Statement The electric field just above the surface of Earth has been measured to typically be 163 N/C pointing downward. What is the total charge on Earth's surface implied by this measurement? Homework Equations ∫EdA = Qinside/ɛo The Attempt at a Solution I...

Homework Statement The figure below shows a portion of an infinitely long, concentric cable in cross section. The inner conductor has a linear charge density of λ = 6.10 nC/m and the outer conductor has no net charge. http://www.webassign.net/tipler/23-36alt.gif (a) Find the electric field...

Awesome, thanks so much!

Homework Statement In a pool game, the cue ball, which has an initial speed of 8.0 m/s, make an elastic collision with the eight ball, which is initially at rest. After the collision, the eight ball moves at an angle of 30° to the original direction of the cue ball. Homework Equations V8...

Homework Statement A 56-kg woman contestant on a reality television show is at rest at the south end of a horizontal 141-kg raft that is floating in crocodile-infested waters. She and the raft are initially at rest. She needs to jump from the raft to a platform that is several meters off the...

Ok I see now, Total*.0084 = 4x10^31 Mass entering per second = 4x10^31*.9916/.0084 = 4.72x10^33 4.72x10^33 / ((3x10^8)^2) = 5.247x10^16 kg/s is the right answer, thanks for the help!

Right, which is why I take 4x10^31*.9916 to get the J absorbed by the black hole per second. Am I right in doing so, or am I doing something wrong?

Homework Statement If a black hole and a "normal" star orbit each other, gases from the normal star falling into the black hole can have their temperature increased by millions of degrees due to frictional heating. When the gases are heated that much, they begin to radiate light in the X-ray...

Homework Statement A curve of radius 15 m is banked so that a 930 kg car traveling at 48.0 km/h can round it even if the road is so icy that the coefficient of static friction is approximately zero. You are commissioned to tell the local police the range of speeds at which a car can travel...