In the design of a rapid transit system , it is necessary to balance the average speed of a train against the distance between stops. The more stops there are, the slower the train’s average speed. To get an idea of this problem, calculate the time it takes a train to make a 9.0-km trip in two situations: ( a ) the stations at which the trains must stop are 1.8 km apart (a total of 6 stations, including those at the ends): and ( b ) the stations are 3.0 km apart (4 stations total). Assume that at each station the train accelerates at a rate of 1.1 m/s 2 until it reaches 95 km/h. then slays at this speed until its brakes are applied for arrival at the next station, at which time it decelerates at −2.0 m/s 2 . Assume it stops at each intermediate station for 22 s.
In the design of a rapid transit system , it is necessary to balance the average speed of a train against the distance between stops. The more stops there are, the slower the train’s average speed. To get an idea of this problem, calculate the time it takes a train to make a 9.0-km trip in two situations: ( a ) the stations at which the trains must stop are 1.8 km apart (a total of 6 stations, including those at the ends): and ( b ) the stations are 3.0 km apart (4 stations total). Assume that at each station the train accelerates at a rate of 1.1 m/s 2 until it reaches 95 km/h. then slays at this speed until its brakes are applied for arrival at the next station, at which time it decelerates at −2.0 m/s 2 . Assume it stops at each intermediate station for 22 s.
In the design of a rapid transit system, it is necessary to balance the average speed of a train against the distance between stops. The more stops there are, the slower the train’s average speed. To get an idea of this problem, calculate the time it takes a train to make a 9.0-km trip in two situations: (a) the stations at which the trains must stop are 1.8 km apart (a total of 6 stations, including those at the ends): and (b) the stations are 3.0 km apart (4 stations total). Assume that at each station the train accelerates at a rate of 1.1 m/s2 until it reaches 95 km/h. then slays at this speed until its brakes are applied for arrival at the next station, at which time it decelerates at −2.0 m/s2. Assume it stops at each intermediate station for 22 s.
In the design of a rapid transit system, it is necessary to balance the average speed of a train against the distance between station stops. The more stops there are, the slower the train’s average speed. To get an idea of this problem, calculate the time it takes a train to make a 15.0-km tripin two situations: (a) the stations at which the trains must stop are 3.0 km apart (a total of 6 stations, including those at the ends); and (b) the stations are 5.0 km apart (4 stationstotal). Assume that at each station the train accelerates at a rate of 1.1 m/s2until it reaches 95 km/h then stays atthis speed until its brakes are applied for arrival at the next station, at which time it decelerates at - 2.0 m/s2 Assume it stops at each intermediate station for 22 s.
In good weather the drive from Seattle to Spokane,Washington, on Interstate 90 takes 3 h 51 min at an average speed of 105 km/h.In winter, however, it is not unusual to average only 80 km/h.How long would the trip take at this average speed?
On a two-lane road, car A is travelling with a speed of 72 km/h. Two cars B and C approach car A in opposite directions with a speed of 108 km/h each. At a certain instant, when the distance AB is equal to AC, both being 2 km, B decides to overtake A before C does. What minimum acceleration of car B is required to avoid an accident ?
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Physics for Science and Engineering With Modern Physics, VI - Student Study Guide
Essential University Physics: Volume 2 (3rd Edition)
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