logic families

what are different logic families w.r.t. logic gates?

a temperature

a temperature of -162 degrees C corresponds to a. 111k b. -111k c. -162k d. 162k

if x= a + bt + ct^2

if x= a + bt + ct^2, where x is in meters and t is in seconds the unit of C is a. m/s^2 b. m/s c. m d. 1/s^2

the coordinates of three

the coordinates of three particles are (5,7), (0,3) and (-1,-1). if the three particles have masses of 1.0 kg, 2.0 kg and 2.0 kg respectively, find the coordinates of the center of mass. a.(-0.6,2.2) b. (0.6, 2.2) c. (-0.6, -2.2) d. (0.6, -2.2)

Electric Circuits

1) For the circuit below find: a) The current through R1. b) The current through R2. c) The current at the ammeter. See attached file for full problem description.