Aparticle starts from it's origin at t=0 with an initial velocity having an x component of 20m/s and y component of -15m/s. the particle moves in the x-y plane with an x- component of the acceleration only given by ax=4.0m/s. determine the components of the velocity at any time and the total velocity travelled at any time. (b) calculate the velocity of the particle at t=5.0s. (c) determine the x and y coordinates of the particle at t=5.0 s.

What pressure difference is required between the ends of a 2.0-m-long, 1.0-mm-diameter horizontal tube for 40 c water to flow through it at an average speed of 4.0 m/s?

How many neutrons does plutonium -196 with an atomic number of 78.

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".