Why do sanderling's that are beyond breeding age stay in the southern feeding grounds during the spring and summer

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.

Which term defines a powers shared by state and federal governments? a. concurrent. b. expressed. c. implied. d. reserved

The maximum wavelength of light required to eject an electron from zinc is 270nm. calculate the threshold frequency of zinc.