If two waves pass a point every second, what is the frequency of the waves?
a. one wave per second
b. two waves per second
c. half a wave per second
d. one wave per two seconds

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?

Ways that industry and agriculture use physical properties to separate substances

To a of 4 x hz is 1. 0. mm nm nm