2. In which of the following graphs below are both runners moving at the same speed? Explain your answer. 3. The distance-time graphs below represent the motion of a car. Match the descriptions with the graphs. Explain your answers.
a. Descriptions:
i. The car is stopped.
ii. The car is traveling at a constant speed.
iii. The speed of the car is decreasing.
iv. The car is coming back.

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

A2.0 μf capacitor and a 4.0 μf capacitor are connected in series across a 0.827-kv potential. the charged capacitors are then disconnected from the source and connected to each other with terminals of like sign together. find the voltage across each capacitor.

Which of the following is not a transverse wave? a) soundb) lightc) radiod) all of thesee) none of these