The diagram below shows a flat mirror reflecting
In the above image, what is represented by line D?
the mirror
the angle of reflected light
the angle at which light hits the surface of the mirror
the imaginary line used to measure angles of rays

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Under conditions for which the same room temperature is maintained by a heating or cooling system, it is not uncommon for a person to feel chilled in the winter but comfortable in the summer. provide a plausible explanation for this situation (with supporting calculations) by considering a room whose air temperature is maintained at 20â°c throughout the year, while the walls of the room are nominally at 27â°c and 14â°c in the summer and winter, respectively. the exposed surface of a person in the room may be assumed to be at a temperature of 32â°c throughout the year and to have an emissivity of 0.90. the coefficient associated with heat transfer by natural convection between the person and the room air is approximately 2 w/m2 â‹…â‹… k. what is the ratio of the thermal resistance due to convection to the thermal resistance due to radiation in the summer? what is the ratio of thermal resistances in the winter

Which notation is used to represent an alpha particle? a. b. c. d.

Abowling ball rolling down the lane toward the pins has gravitational potential energy. a. no b. a lot of c. a little