7. An object moves along a plane such that the x- and y-coordinates of its velocity are defined by the functions vx (t) = 3t^2 - 3 and vy (t) = 2t^2 - 8. At what
time is the object's velocity purely horizontal?

Will mark brainliest! asap! ! 16) which of the clouds shown would indicate a possible future rain storm? a) b) c) d)

Ahypothetical metal has an orthorhombic unit cell for which the a, b, and c lattice parameters are 0.413 nm, 0.665 nm, and 0.876 nm, respectively. (a) if there are 8 atoms per unit cell and the atomic packing factor is 0.536, determine the atomic radius (in nm). (b) if the density is 3.99 g/cm3, calculate the metal's atomic weight (in g/mol).

Robin is swinging back and forth from a trapeze. in which of the following situations is his kinetic energy being transformed into potential energy