Physics, 03.07.2019 23:30 kcarstensen59070
On average, both arms and hands together account for 13% of a person's mass, while the head is 7.0% and the trunk and legs account for 80%. we can model a spinning skater with her arms outstretched as a vertical cylinder (head, trunk, and legs) with two solid uniform rods (arms and hands) extended horizontally. suppose a 75.0 kg skater is 1.50 m tall, has arms that are each 66.0 cm long (including the hands), and a trunk that can be modeled as being 33.0 cm in diameter. if the skater is initially spinning at 66.0 rpm with her arms outstretched, what will her angular velocity after she pulls in her arms and they are at her sides parallel to her trunk? assume that friction between the skater and the ice is negligble.
Answers: 2
Physics, 22.06.2019 02:00, LadyHolmes67
The motor m applies a time-varying force of f (200 t) n, where t is in seconds. box b with mass 200 kg starts from rest, and the coefficients of kinetic and static friction are 0.2 and us 0.3 the acceleration due to gravity is g 9.8 m/s2 b 300 a) find the time ' when the box starts to move. b) calculate the speed of the crate at 3 s c) calculate the power delivered by the motor at t 3 s
Answers: 3
On average, both arms and hands together account for 13% of a person's mass, while the head is 7.0%...
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