Question 2 (essay worth 5 points)
a train leaves the station heading west on the tracks. it takes the train 8 seconds to reach 80 miles per hour. it completes the entire 160 mile trip in two hours
calculate the train's average speed and velocity over the two hour trip. show your work. identify if each of the measurements are a scalar or vector quantity

Quantum mechanics applies to subatomic, atomic, nanometer-size, and micrometer-size systems. nanometer, micrometer, and kilometer-size systems. atomic, nanometer-size, and micrometer-size systems. subatomic, atomic, and nanometer-size systems.

What is the force that opposes motion and works against the downward pull? a) friction b) gravity c) weight d) acceleration

An electric power distributor charges residential customers $0.10 per kilowatt-hour (kwh). the company advertises that "green power" is available in 150 kwh blocks for an additional $4 per month. (green power is generated from solar, wind power, and methane sources.) if a certain customer uses an average of 391 kwh per month and commits to one monthly 150 kwh block of green power, what is her annual power bill