A certain concentration of water in the air is needed for the reactions that cause wood to decay. Some timbers from Hopi pueblos have been preserved
for hundreds of years in the high desert.
However, a rowboat abandoned on a beach can rot away in just a few years.
Review the information in the data table. What can you conclude about the
rates of these reactions?
Object
Location
Decay time
Average
concentration of
water in the air
Arizona desert
Very low
Pueblo roof
beam
1,000 years or
more
Wooden rowboat Oregon beach
High
5 to 10 years

Unpolarized light falls on two polarizer sheets whose transmission axes are at right angles. a third polarizer is placed between the first two so that its axis makes a 52-degree angle with the axis of the first polarizer. a) what fraction of the incident light intensity is transmitted through the first polaroid? b) what fraction of the incident light intensity is transmitted through the second polaroid? c) what is the angle of polarization of the light that enters the third polaroid? d) what fraction of the incident light intensity is transmitted through the third polaroid. e) what happens if the middle polaroid is removed?

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

An electron is traveling with initial kinetic energy k in a uniform electric field. the electron comes to rest momentarily after traveling a distance d. (a) what is the magnitude of the electric field