Al and ben are drivers for sd trucking company. one snowy day, ben left sd at 8: 00 a. m. heading east and al left sd at 11: 00 a. m. heading west. at a particular time later that day, the dispatcher retrieved data from sd’s vehicle tracking system. the data showed that, up to that time, al had averaged 40 miles per hour and ben had averaged 20 miles per hour. it also showed that al and ben had driven a combined total of 240 miles. at what time did the dispatcher retrieve data from the vehicle tracking system? a. 1: 00 p. m. b. 2: 00 p. m. c. 3: 00 p. m. d. 5: 00 p. m. e. 6: 00 p. m.

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

Two polarizers are oriented at 70∘∘ to one another. unpolarized light falls on them. what fraction of the light intensity is transmitted?

One object has a mass of 1 kg and another object has a mass of 3 kg. if the speeds are the same, which of the following is true about their kinetic energy?