To perform an accurate assessment of heart rate, the examiner can do which of the following? select all that apply
a. count the radial pulse for 30 seconds, if the pulse is regular, and multiply by two.
b. if irregular, auscultate the heart and count beats for 1 minute.
c. count the radial pulse for 2 full minutes if the pulse is irregular.
d. count the radial pulse for 15 seconds, if the pulse is regular, and multiple by 4.

Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

Suppose water is leaking from a tank through a circular hole of area ah at its bottom. when water leaks through a hole, friction and contraction of the stream near the hole reduce the volume of water leaving the tank per second to cah 2gh , where c (0 < c < 1) is an empirical constant. a tank in the form of a right-circular cone standing on end, vertex down, is leaking water through a circular hole in its bottom. (assume the removed apex of the cone is of negligible height and volume.) (a) suppose the tank is 20 feet high and has radius 8 feet and the circular hole has radius 2 inches. the differential equation governing the height h in feet of water leaking from a tank after t seconds is dh dt = − 5 6h3/2 . if the height of the water is initially 8 feet, how long will it take the tank to empty? (round your answer to two decimal places.)

Students in an introductory physics lab are performing an experiment with a parallel-plate capacitor made of two circular aluminum plates, each 11 cm in diameter, separated by 1.0 cm. how much charge can be added to each of the plates before a spark jumps between the two plates? for such flat electrodes, assume that value of 3×106n/c of the field causes a spark.