(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)-

Asmall metal bar, whose initial temperature was 10° c, is dropped into a large container of boiling water. how long will it take the bar to reach 70° c if it is known that its temperature increases 2° during the first second? (the boiling temperature for water is 100° c. round your answer to one decimal place.) sec how long will it take the bar to reach 98° c? (round your answer to one decimal place.)

Why is metal often used for cooking pan?

Astudent wears sunglasses to her read a book more easily which wave interaction occurs as light passes from the air into the plastic lenses? a polarization b.refraction c.diffraction d. interference