Alocal 1 mhz am radio station from davis wants to broadcast 24 hours a day of the hit show "cow talk" to cities west of davis (vacaville, dixon, suisun, however, they do not want to waste power broadcasting to sacramento because people there aren't into cows. assume that the radio station is using two 3 m tall towers. but reflections from the ground cause the towers to appear 6 m tall electrically. also assume that the current is uniform along each tower length. (a) show that the two towers should be separated by 75 m and be driven 90° out of phase to produce a pattern (called a cardioid) with a single null to the east. (b) should the eastem dipole lead or lag?

the design of a ski jumping suit involves a trade-off between giving the skiers lift to get higher jumps and ensuring the skier does not face a lot of drag before the jump itself. an expansive suit may to lift the skier higher, but at the same time, it will also increase the air resistance. higher air resistance as the skier goes down the slope limits the speed of the jump. a big suit also increases the risk of losing balance or control, especially if there's a strong gust of wind. while technologically enhanced suits a lot, clothing is not the only factor in a ski jumper’s success. gathering speed while skiing down the slope, ensuring good speed on the ramp, and maintaining good body posture and form in the air all contribute to a ski jumper's success.

in most common fires, oxygen is needed for an oxidation reaction to takes place. the combination of oxygen with any element as fuel can create fire and combustion will occur especially if wood, light materials and other combustible things are combine with oxygen.