The initial velocity of an enzyme catalyzed reaction is determined by : a. graphically determining 1/2 Vmax
b. calculating the amount of product formed over time while the amount of product is increasing in a linear manner
c. calculating the amount of product formed over time from the beginning to the end of the reaction
d. graphing the absorbances of known concentrations

Atrain is traveling at 30.0 m/s relative to the ground in still air. the frequency of the note emitted by the train whistle is 262 hz. the speed of sound in air should be taken as 344 m/s. what frequency (f approach) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and approaching it? what frequency (f recede) is heard by a passenger on a train moving at a speed of 18.0 m/s relative to the ground in a direction opposite to the first train and receding from it?