Project seafarer was an ambitious program to construct an enormous antenna, buried underground on a site about 1 km^2 in area. its purpose was to transmit signals to submarines while they were deeply submerged. ordinarily, electromagnetic radiations do not penetrate very far into conductors such as seawater. assume that the effective wavelength was 3.5 x 10^4 earth radii.

(a) what would be the frequency of the radiations emitted? (units in hz)

(b) what would be the period of the radiations emitted? (units in seconds)

Herbivores, carnivores, and omnivores are all types a. decomposers b. producers c. consumers d. biomes

Calculate the work done by an external agent during an isothermal compression of 1.00 mol of oxygen from a volume of 22.4 l at 10∘c and 1.0 atm pressure to 16.8l

In the future, people will only enjoy one sport: electrodisc. in this sport, you gain points when you cause metallic discs hovering on a field to exchange charge. you are an electrodisc player playing the popular four disc variant. the disks have charges of qa = −8.0 µc, qb = −2.0 µc, qc = +5.0 µc, and qd = +12.0 µc. (1) you bring two disks together and then separate them. you measure the resulting charge of these two disks and find that it is +5.0 µc per disk. which two disks did you bring together? (a) a and b (b) a and c (c)a and d (d)b and c(e) b and d (f) c and d. (2) you bring three disks together and then separate them. you measure the resulting charge of these three disks and find that it is +3.0 µc per disk. which three disks did you bring together? a, b, and c (a) a, b, and d (c) a, c, and d (d) b, c, and d. (3) given the resulting charge of each disk measured in (b) is +3.0 µc, how many electrons would you need to add to a disk of this charge to electrically neutralize it? electrons