Physics is explicitly involved in studying which of these activities?
a.) the mixing of metals to form an alloy
b.) the metabolic functions of a living organism
c.) the motion of a spacecraft under gravitational influence
d.) the depletion of the atmospheric ozone layer due to pollutants
e.) the killing of cancerous cells by radiation therapy

Picture a all traveling at a constant speed around the inside of a circular structure. is the ball accelerating? explain your answer

Energy is the ability to do work which measures what

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