One end of a vertical 360 N/m spring is attached to the ceiling and the other end is at- tached to a 20 kg mass. The mass is released from rest when the spring is at equilibrium length. The mass falls 1.2 m before again coming to rest, how much mechanical energy is lost during this fall

What is the function of the commutator in a dc motor? a. to spin the magnet b. to change direct current into alternating current c. to change alternating current into direct current d. to spin the wire coil

Which type of microscope would allow the viewer to see ribosomes inside a cell?

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)