n or Sign Upl Cheg ×\" west Liberty: MyWorks.xy. QUZChapter 2 e Sign eC Secure I
ID: 1880146 • Letter: N
Question
n or Sign Upl Cheg ×" west Liberty: MyWorks.xy. QUZChapter 2 e Sign eC Secure I https://sakai westlberty edu/samigo-app/istrdelivery/begin TakingAssessment faces Question 5 of 10 10.0 Points A motorist travels for 3.0 h at 80 km/h and 2.0 h at 100 km/h. What is her average speed for the trip? 0A.85 km/h O B. 88 km/h . 90 km/h O D. 92 km/h Reset Selecti Mark for Review What's This? Question 6 of 10 10.0 Points A ly (light year) is the distance that light travels in one year. The speed of light is 3.00X109 m/s. How many miles are there in a ly? (1 mi 1609 m, 1 yr 365 d.) A. 9.46X1015 mi B. 5.88x1015 mi . 9.46x 1012 mi D. 5.88x102 mi Mark for Review Wh +31 7:22 9Explanation / Answer
(5) For first 3 hour speed was 80 km/h
Distance calculated in first three hour (S1) = speed*time = 80*3 = 240 km
onw for next two hour , speed was 100 km/h
Distance calculated in next two hour (S2) = 100*2 = 200 km
Hence the total distance covered = S1 + S2 = 240 +200 = 440 km
Total time taken = 3+2 = 5 hr
We know that the average speed is given by = Total distance/ total time
= 440/5 = 88 km/h
hence the correct option is B.
(6) We know that
1 light year = 9.46*1015 m
And 1 mi = 1609 m
1 m = (1/1609) mi
hence
1light year = 9.46*1015 *(1/1609) mi
1 light year = 5.88*1012 miles
Hence the correct option is B.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.