Alarge crate has a mass of 214 kg. a horizontal force of positive 212 n is applied to it, causing it to accelerate at 0.130 m/^s2 horizontally. what is the force of friction opposing the motion of the crate? use the correct sign to indicate the direction of the force of friction. it is the sole force opposing the crate's motion in this direction.

Anybody wanna ? (picture included? )

Ablue car pulls away from a red stop-light just after it has turned green with a constant acceleration of 0.5 m/s 2 . a green car arrives at the position of the stop-light 6.5 s after the light had turned green. if t = 0 when the light turns green, at what time does the green car catch the blue car if the green car maintains the slowest constant speed necessary to catch up to the blue car? answer in units of s.

(a) calculate the activation energy, qv, for vacancy formation in silver, given that the equilibrium number of vacancies at 1073k is 3.6 x 1023 m-3. the atomic weight and density (at 1073k) of for silver are, respectively, 107.9 g/mol and 9.5 g/cm3.