Assume that aluminum is evaporating from a source at the rate of 5 x 1020 atoms/sec. make an estimate of the time it would take to form a 2000a layer on a 4" wafer that is 150mm distant [and perfectly square to the source b: if the evaporating source used above is charged with 5 grams of aluminum- how long could it evaporate at that rate?

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)

Astudent throws a water balloon with speed v0 from a height h = 1.76 m at an angle θ = 21° above the horizontal toward a target on the ground. the target is located a horizontal distance d = 9.5 m from the student’s feet. assume that the balloon moves without air resistance. use a cartesian coordinate system with the origin at the balloon's initial position. (a) what is the position vector, rtarge t, that originates from the balloon's original position and terminates at the target? put this in terms of h and d, and represent it as a vector using i and j. (b) in terms of the variables in the problem, determine the time, t, after the launch it takes the balloon to reach the target. your answer should not include h. (c) create an expression for the balloon's vertical position as a function of time, y(t), in terms of t, vo, g, and θ. (d) determine the magnitude of the balloon's initial velocity, v0, in meters per second, by eliminating t from the previous two expressions.

Decreased sensitivity to an unchanging stimulus is known as