Write the answer in scientific notation, using the wanted unit. (1.26 x 10^4 kg) + (2.5 x 10^6 g)

write the answer in kilograms.

Explain vector addition, triangle method and parallelogram method

Abar magnet cut in half will form a total ofpoles.a)fourb)eightc)two

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".