1. Using a block-and-tackle, a mechanic pulls 8.2 m of chain with a force of 90 N in order to lift a 320 N motor to a height of 2.9 m.
a) What is the AMA( Actual mechanical advantage) 10 points
b) What is the IMA (Ideal Mechanical Advantage) 10 points
c. What is the efficiency of the block-and-tackle? (10 points)

Which of these describe conduction transfer of heat between two objects that are touching transfer of heat by the actual movement of war matter the process in which energy is imitated by one of the object transmitted through space and absorbed by another a process in which energy is released by the molecules breaking apart

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.)

Three charge are arranged as shown in the diagram. the magnitude of the net electrical force acting on the +6 uc charge, rounded to the tenths place, is .