Physics, 14.11.2019 07:31, michaeldragon9663
If a particle's position is given by x = 4 − 12 t + 3 t^ 2 (where t is in seconds and x is in meters), what is its velocity at s t = 1 s ? b) is it moving in the positive or negative direction of x just then? c) what is its speed just then? d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculations.) e) is there ever an instant when the velocity is zero? if so, give the time t ; if not, answer no. f) is there a time after t = 3 s when the particle is moving in the negative direction of x ? if so, give the time t ; if not, answer no.
Answers: 1
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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
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Physics, 22.06.2019 01:00, Bearboy1564
Asuppose a suitcase has a mass of (m) 30 kg and a net force (n) of 10 kg*m/s. what is the acceleration rate of the suitcasein m/s? show your work to support your answer.
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If a particle's position is given by x = 4 − 12 t + 3 t^ 2 (where t is in seconds and x is in meters...
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