Lavoisier discovered the principle of conservation of mass in chemical reactions.
TRUE
FALSE

The of a machine determines its "usefulness." a. input force b. output force c. mechanical advantage

True or false: the revolution of the earth creates day and night as it rotates around the sun

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° 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.)