Water waves crash in on the beach at a velocity of 3.5 m s . if the distance between the crest of each wave is 4 m, determine the frequency of the water waves. v = fλ.

a) 0.88 hz
b) 7.0 hz
c) 14.0 hz

Why is alchemy not considered to be a science ?

Athin, square metal plate measures 14 cm on each side and has emissivity of 0.60. the plate is heated to a temperature of 745°c. what is the rate at which the plate radiates energy ? the stefan-boltzmann constant is 5.67 × 10-8 w/(m2 ? k4). remember that the plate will radiate energy from both its top and bottom surfaces.

It is really hard for me right know