Submitted One of the more challenging elements in pa which the female figure skater, balanced on one skate, is spun in a circle by the male skater. the "death spiral" (see the figure below), in The axis of rotation of the pair is vertical and through the toe of the skate on the male skater's leg that is bent backward, the toe being planted into the ice. During the one-armed maneuver first developed in the 1940s, the outstretched arm of the male skater must apply a large force to support a significant fraction of the female skater's weight and also to provide her centripetal acceleration. This force represents a danger to the structure of the wrist of the male skater. (a) Modeling the female skater, of mass 54.0 kg, as a particle, and assuming that the combined length of the two outstretched arms is 120 cm and that arms make an angle of 45.0° with the horizontal, what is the magnitude of the force (in N) exerted by the male skater's wrist if each turn is completed in 2.00 s? 686.7 X Visualize the rotation of the skaters, and the force exerted by the male skater's arm. How does this force relate to the centripetal acceleration of the female skater? N Fm male skater's wrist (b) How does this force compare to that on one wrist of a 70.0 kg person preparing to do chin-ups by hanging from an exercise bar from the wrists? 343 X F one wrist of 70.0 kg person Visualize a person doing chin ups. When hanging straight down, how much of the person's weight is supported by each wrist?

You have a summer internship at NASA and are working on plans for a new space station to be launched into orbit around the Earth. The design of the space station is shown. i It is to be constructed in the shape of a hollow ring of mass 52,000 kg. The structures other than the ring shown in the figure have negligible mass compared to the ring. Members of the crew will walk on a deck formed by the inner surface of the outer cylindrical wall of the ring, with radius r = 140 m. The thickness of the ring is very small compared to the radius, so we can model the ring as a hoop. At rest when constructed, the ring is to be set rotating about its axis so that the people standing inside on this deck experience an effective free-fall acceleration equal to g. The rotation is achieved by firing two small rockets attached tangentially to opposite points on the rim of the ring. Your supervisor asks you to determine the following: (a) the time interval during which the rockets must be fired if each…

What is the angular momentum of a 3.4-kg uniform cylindrical grinding wheel of radius 24 cm when rotating at 1400 rpm ? How much torque(in magnitude) is required to stop it in 6.0 s ? Express your answer using two significant figures

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