1.) the radio wave from a station broadcasting at 1.3×10^6 hz has a wavelength of 230 m. what is the wave's speed? 2.) a wave has a frequency of 575 hz. what is its period? 3.) a humming bird feeder is tied by a rope to a tree branch. you notice that in a gentle breeze, the feeder moves back and forth 15 times in 1 minute. how long is the rope?

Aria drove to the store, did some shopping, and then came home. during maria's trip, when was her displacement equal to zero?

A5 foot by 5 foot box culvert is buried 6 feet beneath the surface of the ground. a crosssection of this very long culvert (into and out of the page) is illustrated below. assume that the soil in which the culvert is buried has the following properties: jt = 120 pcf, w = 12%, ko = 0.50, ka = 0.33, and kp = 3.00. calculate the total horizontal force per unit length of culvert (fh) felt on one of the vertical faces of the culvert.

To place a communications satellite into a geosynchronous orbit at an altitude of 22,240 mi above the surface of the earth, the satellite first is released from a space shuttle , which is in a circular orbit at an altitude of 185 mi, and then is propelled by an upper-stage booster to its final altitude. as the satellite passes through a, the booster's motor is fired to insert the satellite into an elliptic transfer orbit. the booster is again fired at b to insert the satellite into a geosynchronous orbit. knowing that the second firing increases the speed of the satellite by 4810ft/s, determine (a.) the speed of the satellite as it approaches b on the elliptic transfer orbit, (b.) the increase in speed resulting from the first firing at a.