A spring 1.7 m long with force constant 550 N/m is hung from the ceiling of an elevator, and a block of mass 15 kg is attached to the bottom of the spring. (a) By how much is the spring stretched when the block is slowly lowered to its equilibrium point

Using the given data table, calculate the acceleration of the skateboarder. you can use either form of the equation below?

Asun-sized star will spend most of its lifetime as a: white dwarf red giant protostar main-sequence star

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.)