Two radio antennas are 130 m apart on a north-south line. the two antennas radiate in phase at a frequency of 3.6 mhz. all radio measurements are made far from the antennas. the smallest angle, reckoned east of north from the antennas, at which constructive interference of two radio waves occurs, is closest to:

The starship enterprise is caught in a time warp and spock is forced to use the primitive techniques of the 20th century to determine the specific heat capacity of an unknown mineral. the 125-g sample was heated to 96.3°c and placed into a calorimeter containing 85.9 g of water at 20.0°c. the heat capacity of the calorimeter was 14.2 j/k. the final temperature in the calorimeter was 24.5°c. what is the specific heat capacity (in j/g°c) of the mineral? enter to 4 decimal places.