An elevator with an empty mass of is raised and lowered by a electric motor. The elevator is raised by the motor to the 3rd floor, a distance of . A woman then gets on the elevator and rides it to the 6th floor, a further , where she gets off. The empty elevator is then lowered back down to the 3rd floor. Calculate the change in gravitational potential energy of the elevator. Round your answer to significant digits.

Match each scenario to the form of energy it represents

Which is not true of the intertropical convergence zone? a) it features heavy precipitation b) it's where the trade winds collidec) it's a high-pressure zone with sinking air d) it is also known as the doldrums

Asilver dollar is dropped from the top of a building that is 1324 feet tall. use the position function below for free-falling objects. s(t) = −16t2 + v0t + s0 (a) determine the position and velocity functions for the coin. s(t) = v(t) = (b) determine the average velocity on the interval [1, 2]. ft/s (c) find the instantaneous velocities when t = 1 second and t = 2 seconds. v(1) = ft/s v(2) = ft/s (d) find the time required for the coin to reach the ground level. (round your answer to three decimal places.) t = s (e) find the velocity of the coin at impact. (round your answer to three decimal places.) ft/s