The equation of a progressive wave is given by y = 5 sin(100t - 0.4x)
where y and x are in m and t is in s. Find
a) The amplitude of the wave.
b) The wavelength of the wave.
c) The frequency of the wave.
d) The velocity of the wave.

Aswimmer is determined to cross a river that flows due south with a strong current. initially, the swimmer is on the west bank desiring to reach a camp directly across the river on the opposite bank. in which direction shoud the swimmer head? a. the swimmer should swim southeast. b. the swimmer should swim south. c. the swimmer shuold swim northeast. d. the swimmer should swim due north. e. the swimmer should swim due east.