Two spherical shells have a common center. A -1.00 × 10^-6 C charge is spread uniformly over the inner shell, which has a radius of 0.050 m. A +4.00 × 10^-6 C charge is spread uniformly over the outer shell, which has a radius of 0.15 m. Find the magnitude and direction of the electric field at a distance (measured from the common center) of
(a) 0.20 m,(b) 0.10 m,c) 0.025 m.

The coefficient of static friction between teflon and scrambled eggs is about 0.04.
What is the smallest angle from the horizontal that will cause the eggs to slide across the bottom of the Teflon-coated skiller?

A small rock moves in water, and the force on it by the water is given by f=kv. The terminal speed of the rock is measured and found to be 2.0m/s. The rock is projected upward at an inital speed of 6.0m/s. You can ignore the buoyancy force on the rock

a) in the absence of fluid resistance, how high will the rock rise and how long will it take to reach this maximum height? I managed this one. b) when the effects of fluidresistance are included, what are the answers to the question in part a).

i manage to get the same z time as the solution on this website.

I and the website has the same equation for Vy.

the websites solution for Y = Vt*[1-e^(-k/mt))] which is the same expression as the example in the book.

But in the example in the book there is no initial speed Vy=0. In the question there is initla speed and therefor I think the expression for Y must be different from the examples expression. Therefore I think the solution of this question on this website must be wrong. Please comment me on this.

The following objects are released simultaneously from rest at the top of a 1.35m long ramp inclined at 3.10 degrees to the horizontal: a solid sphere, a solid cylinder, a hollow cylindrical shell, and a hollow ball.

Which wins the race? The solid Sphere won, I just cant get the positions of the other 3 objects

At the moment the winner reaches the bottom, find the positions of the other three objects.

please explain....

A block of wood has a mass of 3.54 kg and a density of 588 kg/m3. It is to be loaded with lead (1.13 × 104 kg/m3) so that it will float in water with 0.887 of its volume submerged. What mass of lead is needed if the lead is attached to (a) the top of the wood and (b) the bottom of the wood?

Cavendish measured the gravitation constant G, but actually he measured that constant on the Earth. What

Show your work for the following, not just the final answer:

a) What is the SIL for a sound of intensity Ia=5.2

The determined Wile E. Coyote is out once more to try to capture the elusive roadrunner. The coyote wears a new pair of power roller skates, which provide a constant horizontal acceleration of 15 m/s². The coyote starts off at rest 70 m from the edge of a cliff at the instant the roadrunner zips by in the direction of the cliff.

(a) If the roadrunner moves with constant speed, find the minimum speed the roadrunner must have to reach the cliff before the coyote.

_______ m/s

(b) If the cliff is 100 m above the base of a canyon, find where the coyote lands in the canyon. (Assume that his skates are still in operation when he is in "flight" and that his horizontal component of acceleration remains constant at 15 m/s².)

__________ m from the base

Your camera has a lens with a 35.0 mm focal length and film that is 36.0mm wide. In taking a picture of an airplane 22.7m in length, you find that the image of the airplane fills only three-fourths of the width of the film.

a.) How far are you from the airplane?

b.) How close should you stand if you want to fill the width of the film with the airplane's image?

Please show all work, thank you!

A 30 g of clay travelling east at 3.0 m/s collides with a 20 g ball of clay travelling north at 4.0 m/s. What are the speed and the direction of resulting 50 g blob of clay?

Globular clusters were classified by Shapley and Sawyer as being on a scale from 1 to 12 where 1 is very loosely packed central area and 12 is highly packed central area. As a visual astronomer, it seems difficult to judge the concentration of a globular cluster.

Has anyone tried to classify globular clusters concentration classes for something like the Astronomical League Club for Globular Clusters? http://www.astroleague.org/al/obsclubs/globular/globular1.html

It seems that to judge concentration you first need to know what percentage of the diameter of the globular cluster corresponds to the packed core. Visually, knowing the official stated size seems to be required since without that, it is hard to say how concentrated the core is as a glow percentage.

Can any human eye get anywhere near detecting all twelve steps of concentration? It is easy enough to distinguish 3 or 4 levels, but twelve seems daunting.

How can I attempt to properly judge globular clusters on the Shapley and Sawyer scale?

A solenoid runs through the x-y plane with n = 1,185/m. A circular wire wrapped 18 times with a radius of 0.49 meters is placed in the x-y plane in the solenoid. The solenoid's current increases from 6 amps to 28 amps running clockwise in a time of 2.4 millis-seconds. If the resistance of the circular wire is 2.4 Ohms, what is the amount, in amps, and direction of the average induced current in the circular wire? Indicate clockwise by including a negative sign, but do not include a sign for counter-clockwise.

You have 11m of 0.60mm diameter copper wire and a power supply capable of passing 25Athrough the wire.

Part A

What magnetic field strength would you obtain inside a 2.0-cm-diameter solenoid with the wire spaced as closely as possible?

Part B

What magnetic field strength would you obtain at the center of a single circular loop made from the wire?

A projectile (mass = 0.25 kg) is fired at and embeds itself in a stationary target (mass = 2.54 kg). With what percentage of the projectile's incident kinetic energy does the target (with the projectile in it) fly off after being struck?