Which of the following has the largest R-value? (Use the table of R-values on page 111 of the textbook.)
A. 25 mm of air space with a reflective surface on the inside of the wall cavity
B. 50 mm of expanded polystyrene
C. 25 mm of fibreglass
D. 25 mm of rigid urethane foam

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

Light from two different sources are incident upon the same side of a polarizing filter. light from one source is polarized with total intensity ip, while light from the other source is unpolarized with total intensity iu. as you rotate the polarizing filter through 360 degrees, the intensity of the transmitted light on the other side varies by a factor of 9. what is the relative intensity of the initial polarized source to the unpolarized source, or ip/iu?

Give me a example of a decomposer. explain what would happen if decomposers were absent from a forest ecosystem