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.

How many molecules are present in 3 mols of silicon dioxide (sio2)?

Adding more pulleys to a system of pulleys needed to lift an object. a. increases the force b. decreases the force c. increases the amount of work d. decreases the amount of work

Select the best definition for wavelength. the height of an oscillating electromagnetic wave the rate at which electromagnetic waves oscillate. the distance between two crests of an electromagnetic wave. the oscillations of electric and magnetic fields select the best definition for frequency. the oscillations of electric and magnetic fields. the height of an oscillating electromagnetic wave. the distance between two crests of an electromagnetic wave. the rate at which electromagnetic waves oscillate