On a typical clear day, the atmospheric electric field points downward and has a magnitude of approximately 100 N/C. Considering both the gravitational and electric forces on a small dust particle of mass 2.0 × 10−15 g that carries a single electron charge, what is the magnitude of acceleration of the dust particle (in m/s2) ? Group of answer choices

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

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.)