Charge g is distributed in a spherically symmetric ball of radius a. (a) evaluate the average volume charge density p. (b) now assume p(r) is directly proportional to r. (i) derive the formula for p(r) in terms of r, q, and a. at what value of r does p(r)= ? [ans: 340] (ii) find q(r), and graph it.

The us government wants to allocate billions of dollars in the next 10 years to assure our future energy security. the funds will be spread among a variety of possible energy resources. where do you think the government should put the greatest support: solar energy, wind energy, clean coal, oil exploration, gas exploration, or a combination of sources? are there other efforts that should be explored? support your position with cited information for both questions.

A150 w lamp emits light of wavelength 590 nm uniformly in all directions. what is the photon flux (photons per unit area per unit time) on a small screen at a distance 2.3 m from the lamp? assume the photons are uniformly distributed over the surface of a sphere of radius 2.3 m.

Which type of wave can travel without a medium