Learning Goal A rocket train car that is 30 m long is traveling from Los Angeles to New York at u = 0.5c when a light at the center of the car flashes. When the light reaches the front of the car, it immediately rings a bell. Light reaching the back of the car immediately sounds a siren. A bicyclist waiting to cross the tracks sees the light in front of her at the instant when it flashes. Are the bell and siren simultaneous events for the bicyclist? If not, what time delay does the bicyclist hear between the events?
Take the direction of motion of the train (eastward) to be the positive direction of x'. Let the instant when the light flashes be t0 s. What are (xA, tA) and (B, tB), the spacetime coordinates of event A and B in S?

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

State the following: boyle's law and charle's law

Can a molecule have bond dipoles but not have a molecular dipole?