Giving 40 points!

i need to design an experiment to support the hypothesis that light travels in straight lines except at the point it enters a new medium.

a) what can i use for this experiment?
b) how do i use it to complete this experiment? how can i conduct an experiment using it?

An engineer designs a roller coaster so that a car travels horizontally for 162 ft, then climbs 127 ft at an angle of 31.0° above the horizontal. it then moves 127 ft at an angle of 46.0° 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.)

Describe different biomes. what are some adaptations that organisms (plants or animals) must have to live in each biome?

What occurs during a combustion reaction