Marks) Un spectrum (U3
(1) Oil droplets are introduced into the space between two flat horizontal plates 5.0mm apart.
The plates voltage is then adjusted to exactly 780V so that one of the droplets is held
stationary. Then the plate voltage is switched off and the selected droplet is observed to fall
a measured distance of 1.50mm in 11.20s. Find the mass and the charge on the droplet
(04marks)

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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