If ř (t) = t^3i - 2tj + (t^2-2t)k Define velocity and acceleration. If the velocity vector is given on (x, y) plane at time t, define v(t) and a(t) at time t.

8. why do radio telescopes convert radio waves (analog signals) to electrical (digital) signals for analysis? (hint: what did the article say about the advantages of digital signals? )

Which compound is held together by the electrostatic force between two ions? a. co2 b. cci4 c. h2s d. mgf2

This is a form of winter precipitation. it is frozen precipitation falling as ice pellets. snowflakes melt into raindrops as they pass through a thin layer of warmer air. the raindrops then refreeze into particles of ice when they fall into a layer of sub-freezing air near the surface of the earth. this precipitation is called a) hail. b) rain. c) sleet. d) snow.