posted by CJ .
Sally and a partner holds the ends of a spring 4 meters apart. There are 5 nodes in the standing wave produced. Sally moves her hand from the rest position back and forth along the floor 20 times in 4 seconds.
Determine the following:
Wavelenght of wave sally sue sent
Frequence of wave produced
Speed of wave
If one wants to know how the material well-being of the average person has changed over time in a given country, one should look at the?
A. level of real GDP.
B. growth rate of nominal GDP.
C. growth rate of real GDP.
D growth rate of real GDP per person?