5. In a test flight, the X-43A scramjet flew at Mach 7 (seven times the speed of

Question

5. In a test flight, the X-43A scramjet flew at Mach 7 (seven times the speed of sound) for 15.0s. a. At this speed, how many minutes would it take such a scramjet to cross the United Use 331 m/sfor the speed of sound States (5000 km)? b. How many kilometers did the scramjet travel during its 15.0 second flight? 6. On a 60.0 mile bike ride, you ride the first 17.0 miles at an average speed of 14.0 miles per hour. What must your average speed over the final 43.0 miles be in order for your average speed be 12.0 miles per hour? Go/+4312 60/(1.214)-(43/x) 12 17 19, 14 Hx , ei .er 466

Explanation / Answer

5.

a)

Speed= 7*331= 2317 m/s

Time= distance/speed= 5000000/2317= 2157.963/60= 35.97 minute

b) distance= speed* time= 15*2317= 34.755 km

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6.

Av speed= total distance/ total time

Total time= 60/12= 5 h

t1+t2= 5

17/14+ t2= 5

t2= 3.786 h

Average speed for next 43 km

= 43/3.786

= 11.358 km/h

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Comment in case any doubt.. good luck

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