How are first-class levers different from third-class levers?
a. first-class levers do not increase the input force.
b. first-class levers increase the input force.
c. first-class levers do not change the direction of the force
d. first-class levers change the direction of the force.

Afisherman notices that his boat is moving up and down periodically without any horizontal motion, owing to waves on the surface of the water. it takes a time of 2.20 s for the boat to travel from its highest point to its lowest, a total distance of 0.670 m . the fisherman sees that the wave crests are spaced a horizontal distance of 5.80 m apart. (a) how much is the wavelength? (b) find the period of the wave. (c) how fast are the waves traveling? (d) what is the amplitude a of each wave?