(a) complex numbers, a +ib, with a and b real, may be represented by (or are iso- morphic with) 2 x 2 matrices: () a b -b a ib show that this matrix representation is valid for (i) addition and (ii) multiplication. (b) find the matrix corresponding to (a +ib)-

At what time will the interfering waves have an amplitudeof zero?

Which describes an object in projectile motion? check all that apply. a.gravity acts to pull the object downb. the object moves in a straight path. c.the forward velocity of the object is 0 m/s. d.the object’s inertia carries it forward. e.the path of the object is curved.

The friction of the water on a boat produces an acceleration of -10. m/s2. if the boat is traveling at 30. m/s and the motor is shut off, how long it take the boat to slow down to 5.0 m/s?