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 03:50, Jasten
The intensity of a polarized electromagnetic wave is 12 w/m^2. part a) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=0∘ with the plane of polarization? part b) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=30∘ with the plane of polarization? part c) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=45∘ with the plane of polarization? part d) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=60∘ with the plane of polarization? part e) what will be the intensity after passing through a polarizing filter whose axis makes the angle θ=90∘ with the plane of polarization?
Answers: 1
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All the simple machines make work easier to do by changing the or of a force. a. size; type b. work; type c. size; direction d. type; direction
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Physics, 22.06.2019 05:30, trevorhenyan51
Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?
Answers: 2
Usain Bolt's world-record 100 m sprint on August 16, 2009, has been analyzed in detail. At the start...
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