Scientists can use spectral analysis of stars to determine which of the following?
select all that apply.

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.)

If the area of a square has increased by a factor of 16, by how much has each side increased?

In addition to gravity, what is the other predominant force that affects the motion of a pendulum?