Shuffling your feet across the floor as you walk is an example of A) charging by friction
B) induction
C) static discharge
D) conduction
E) none of the above

Distance covered = speed x timethe distance traveled going against the stream = distance traveled with the stream.therefore it is the speed and the time that are the variables.as he travels the same distance both ways, speed x time is the same for each way.going upstream his speed is 4 kph; going downstream his speed is 6 kph.therefore we have two simultaneous equations: time upstream x 4 = time downstream x 6time upstream + time downstream = 60 minutestherefore we have the equation: time upstream = 6/10 hour, time downstream therefore = 4/10 hour.distance traveled at 4km/hr in 6/10 hour = 24/10 = 2.4km.check: distance traveled at 6km/hr in 4/10 hour = 24/10 = 2.4km.

The fuzzy edges of shadows are a result of  diffraction 

Answerit is comparative because this experiment is comparing the results of the volume at minimal pressure and then increases it; ; ;