Ch 27 hw exercise 27.12 10 of 20 constants a horizontal rectangular surface has dimensions 2.80 cm by 3.15 cm and is in a uniform magnetic field that is directed at an angle of 31.0 ∘ above the horizontal. part a what must the magnitude of the magnetic field be in order to produce a flux of 4.00×10−4 wb through the surface? express your answer with the appropriate units. bb = nothing nothing request answer provide feedback

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

How is acceleration calculated? a. initial velocity - final velocity / timeb. initial velocity + final velocity / timec. final velocity - initial velocity / timed. final velocity / timele select the best answer from the choices provided0oood00save and exitnextmark this and return

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island