Heat is lost steadily through a 0.5 cm thick 2 m x 3 m glass window whose thermal conductivity is 0.7 W/(m*K). The inner and outer surface temperatures of the glass are measured to be 12oC to 9oC. The rate of heat loss by conduction through the glass is:

(a) 420W
(b) 5040W
(c) 17,600W
(d) 1256W
(e) 2520W

You are sitting on the beach and wondering about the properties of mechanical waves. describe them in terms of ocean waves.

The “death throes” of stars are amongst the most complex phenomena in all of astronomy, and the “corpses” of stars amongst the most energetic and exotic objects in existence. beginning at the end of the core helium fusion stage in a star’s life, describe in detail the post-main sequence development of both (a) a 1.0 solar mass star, and (b) a 25.0 solar mass star. in what significant ways do they differ? what role does each of these types of stars play in the "star-gas-star" cycle and the evolution of chemical elements in our galaxy?

Zeros that follow non-zeros numbers and are also to the right of a decimal point are significant