Physics help: Lenard is preparing for a marathon by running around a 400 m long running track which is in....
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Physics help: Lenard is preparing for a marathon by running around a 400 m long running track which is in....

[From: ] [author: ] [Date: 12-06-21] [Hit: ]
you are not doing my homework. I am studying for exams and this was a past exam question, thanks!-(1).(b).Lenardonly has centripetal acceleration,......
Lenard is preparing for a marathon by running around a 400 m long running track which is in the shape of a perfect circle. Lenard took 60 seconds to complete each lap.

(b) In the first 30 seconds:

(i) what was Lenard’s angular displacement?
(ii) what was Lenard’s angular velocity?

(c) Explain whether or not there is any acceleration occurring if Lenard is running at a constant speed around the running track.


Note: by answering, you are not doing my homework. I am studying for exams and this was a past exam question, thanks!


-
(1).

θ = (2π/T) t

θ = (2π/60)(30)

θ = π rad


(b).

ω = 2π/T

ω = 2π/60

ω = π/30 rad/s



(c)

Lenard only has centripetal acceleration,

a = ω² r

a = (π/30)² (400/(2π))

a = 2π/9 m/s²
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