Physics, 03.04.2020 00:00 Jaimewillis42
Usain Bolt's world-record 100 m sprint on August 16, 2009, has been analyzed in detail. At the start of the race, the 94.0 kg Bolt accelerated from rest at a rate of 9.50 m/s^2 for the first 0.890 s, and eventually reached a top speed of 12.4 m/s by exerting an average horizontal force of 820 N against the ground for the entire 9.58 s duration of the race. a. What was the average horizontal force (in N) exerted by Bolt against the ground during the first 0.890 s of the race?b. What was Bolt's speed (in m/s) after the initial acceleration phase?c. What was the power expended by Bolt during the initial acceleration phase?d. It has been shown that, because of his large frame and 6'5" height, Bolt experienced significant drag forces during the sprint. To estimate the energy lost to drag forces during the race, let's focus on the remaining 9.58 s − 0.890 s = 8.69 s of the race after Bolt's initial burst of acceleration. The drag force varies with speed, but let's find an average drag force over the last 8.69 s of the race. Model the drag force as a friction force and find the increase in internal energy of Bolt and the surrounding air in these 8.69 s as Bolt runs through the air. e. Finally, find the power that Bolt must expend just to overcome the drag force and compare it to the result in part (c).
Answers: 2
Physics, 22.06.2019 02:10
How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by
Answers: 2
Physics, 22.06.2019 09:10
The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island
Answers: 1
Usain Bolt's world-record 100 m sprint on August 16, 2009, has been analyzed in detail. At the start...
Mathematics, 12.12.2021 08:00
Mathematics, 12.12.2021 08:00
Physics, 12.12.2021 08:00
Mathematics, 12.12.2021 08:00
Chemistry, 12.12.2021 08:00
Mathematics, 12.12.2021 08:00
Mathematics, 12.12.2021 08:00
Mathematics, 12.12.2021 08:00
Mathematics, 12.12.2021 08:00
Mathematics, 12.12.2021 08:00
Biology, 12.12.2021 08:00
Mathematics, 12.12.2021 08:00
History, 12.12.2021 08:00