Based on the model, which statement best explains why point A is experiencing summer?
A. Earth's equator is receiving the least direct rays of sunlight.
B. Earth's southern hemisphere is tilted toward the Sun.
C. Earth's south pole is receiving the most direct rays of sunlight.
D. Earth's northern hemisphere is tilted toward the Sun.

How much force must a locomotive exert on a 12840-kg boxcar to make it accelerate forward at 0.490 m/s2?

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

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.