Dancers experience large forces associatedwith the jumps they make. For example, when a dancer landsafter a vertical jump, the force exerted on the head by the neck mustexceed the head’s weight by enough to cause the head to slow down andcome to rest. The head is about 9.4% of a typical person’s mass. Videoanalysis of a 65 kg dancer landing after a vertical jump shows that herhead decelerates from 4.0 m>s to rest in a time of 0.20 s. Compared with the force her neck exerts on her head during the landing, the force her head exerts on her neck is (a) the same; (b) greater; (c) smaller; (d) greater during the first half of the landing and smaller during the second half of the landing.
Dancers experience large forces associatedwith the jumps they make. For example, when a dancer landsafter a vertical jump, the force exerted on the head by the neck mustexceed the head’s weight by enough to cause the head to slow down andcome to rest. The head is about 9.4% of a typical person’s mass. Videoanalysis of a 65 kg dancer landing after a vertical jump shows that herhead decelerates from 4.0 m>s to rest in a time of 0.20 s. Compared with the force her neck exerts on her head during the landing, the force her head exerts on her neck is (a) the same; (b) greater; (c) smaller; (d) greater during the first half of the landing and smaller during the second half of the landing.
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
Dancers experience large forces associated
with the jumps they make. For example, when a dancer lands
after a vertical jump, the force exerted on the head by the neck must
exceed the head’s weight by enough to cause the head to slow down and
come to rest. The head is about 9.4% of a typical person’s mass. Video
analysis of a 65 kg dancer landing after a vertical jump shows that her
head decelerates from 4.0 m>s to rest in a time of 0.20 s. Compared with the force her neck exerts on her head during
the landing, the force her head exerts on her neck is (a) the same;
(b) greater; (c) smaller; (d) greater during the first half of the landing
and smaller during the second half of the landing.
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