Determine the period and frequency in SI units, for the following: a.) A human eye blinks 12 times in 48 s
b.) A compact disc rotate at a rate of 210 revolutions per minute

What is a possible result of higher air temperature caused by global warming

The movement of electrons between atoms is called an

You have two photos of a person walking. one shows the person at the corner of third and main streets, the other shows the person at the corner of tenth and main streets. there are lampposts at every corner in this town, and the first picture shows it to be 10: 32: 00 exactly. the second picture shows it to be 10: 49: 30. you know three facts: (1) all of the clocks are synchronized; (2) there are exactly 12 equal-sized blocks per kilometer in this town; and (3) the streets that cross main in this area are numbered consecutively, with no interruptions. what is the person’s average speed in kilometers per hour?