All of the following would be questions that could be scientifically investigated except:
1. will equal sizes of styrofoam and wood have the same mass?
2. does lack of sunlight affect plant growth?
3. what is the proper number of children to have in today's family?
4. does adding salt to water raise its boiling point?

You have been called to testify as an expert witness in a trial involving a head-on collision. car a weighs 1515 lb and was traveling eastward. car b weighs 1125 lb and was traveling westward at 44.0 mph. the cars locked bumpers and slid eastward with their wheels locked for 22.5 ft before stopping. you have measured the coefficient of kinetic friction between the tires and the pavement to be 0.750 . how fast (in miles per hour) was car a traveling just before the collision? (this problem uses english units because they would be used in a u. s. legal proceeding.)

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

Road users moving into your lane, brake lights, and abrupt changes in road surface are a. rare at night b. indicators of potential hazards c. not worth worrying about before you reach them d. no problem for experienced drivers