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Chapter 2: Q9PE (page 82)

On May 26, 1934, a streamlined, stainless steel diesel train called the Zephyr set the world鈥檚 nonstop long-distance speed record for trains. Its run from Denver to Chicago took 13hours,4minutes,58seconds , and was witnessed by more than a million people along the route. The total distance travelled was 1633.8km. What was its average speed in km/hand m/s?

Short Answer

Expert verified

124.88鈥塳尘/丑 and 34.689鈥尘/蝉

Step by step solution

01

Given Data

  • Distance =1633.8鈥�km=1633800鈥�m.
  • Time is taken in hours= 13鈥�h+4鈥�min+58鈥塻=13鈥�h+460鈥�h+583600鈥�h=13+0.066+0.01611=13.0821鈥�h
  • Time is taken in seconds = =13脳3600鈥�s+4脳60鈥�s+58鈥�s=46800+240+58=47098鈥�s .
02

Average speed

If the distance covered is d in time t, then the speed can be calculated as:

Speed=dt

The speed covered in km/h can be calculated as:

Speed=1633.8鈥塳尘13.0821鈥塰=124.88鈥塳尘/丑

The speed covered in m/s can be calculated as:

Speed=1633800鈥尘47098鈥塻=34.689鈥尘/蝉

Therefore, the speed is 124.88鈥塳尘/丑and34.689鈥尘/蝉 .

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Most popular questions from this chapter

What information do you need in order to choose which equation or equations to use to solve a problem? Explain.

Is it possible for speed to be constant while acceleration is not zero? Give an example of such a situation.

Blood is accelerated from rest to 30.0 cm/s in a distance of 1.80 cm by the left ventricle of the heart. (a) Make a sketch of the situation. (b) List the knowns in this problem. (c) How long does the acceleration take? To solve this part, first identify the unknown, and then discuss how you chose the appropriate equation to solve for it. After choosing the equation, show your steps in solving for the unknown, checking your units. (d) Is the answer reasonable when compared with the time for a heartbeat?

Acceleration is the change in velocity over time. Given this information, is acceleration a vector or a scalar quantity? Explain.

(a) A world record was set for the men鈥檚 100 mdash in the 2008 Olympic Games in Beijing by Usain Bolt of Jamaica. Bolt 鈥渃oasted鈥� across the finish line with a time of . If we assume that Bolt accelerated for3.00 sto reach his maximum speed, and maintained that speed for the rest of the race, calculate his maximum speed and his acceleration.

(b) During the same Olympics, Bolt also set the world record in the200 mdash with a time of 19.30 s Using the same assumptions as for the 100 mdash, what was his maximum speed for this race?
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