A 45 kg figure skater is spinning on the toes of her skates at 1.1 rev/s. Her arms areoutstretched as far as they will go. In this orientation, the skater can be modeled as a cylindricaltorso (40 kg, 20 cm average diameter, 160 cm tall) plus two rod-like arms (2.5 kg each, 71 cmlong) attached to the outside of the torso. The skater then raises her arms straight above herhead. In this latter orientation, she can be modeled as a 45 kg, 20-cm-diameter,200-cm-tall cylinder.Part AWhat is her new rotation frequency, in revolutions per second?Express your answer in revolutions per second.► View Available Hint(s)W2IIΠΑΠ ΑΣΦ?rev/s

A skater of massis spinning on her toes at a rate of .When the arms of the skater are outstretched…

Answered: A 45 kg figure skater is spinning on…

Similar questions

Two spheres each with a radius of 5.0 cm and mass of 0.50 kg are free to slide along a thin rod with a of length 50 cm and a mass of 2 kg rotating counterclockwise about the center of the rod. Initially, the moment of inertia of the system is 0.255 kg*m². The beads slide to the end of the rod, which changes the moment of inertia to 0.377 kg*m. The tangential speed of either of the spheres after the beads have slid to the end is 20 m/s. What was the initial angular velocity? intial final
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 72.0 kg skater is 1.50 m tall, has arms that are each 72.0 cm long (including the hands), and a trunk that can be modeled as being 36.0 cm in diameter. If the skater is initially spinning at 84.0 rpm with her arms outstretched, what will her angular velocity a be (in rpm) 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. 02 = rpm about us careers privacy policy terms of use contact us help 2 tv MacBook Air
Consider a dual-propeller airplane circling above an airport. The radius of the airplane's path is 2000 meters and it completes one rotation every 10 minutes. The plane has a mass of 1750 kg and its propellers are spinning at 20b rad/s. The propellers consist of two blades each (approximately cylindrical), each with a mass of 5 kg and a length of 0.2 meters. What is the combined angular momentum of the propellers on the aircraft? 26.6 kg*m^2/s Submit Answer Incorrect. Tries 3/5 Previous Tries Ignoring the propellers, what is the angular momentum of the plane circling the airport? Submit Answer Tries 0/5
A propeller consists of two blades each 1.30 m in length and mass 20.0 kg each. The propeller can be approximated by a single rod rotating about its center of mass. The propeller starts from rest and rotates up to 2200 rpm in 30 seconds at a constant rate. What is the angular momentum of the propeller at t = 10 s?
A 45 kg figure skater is spinning on the toes of her skates at 1.5 rev/s. Her arms are outstretched as far as they will go. In this orientation, the skater can be modeled as a cylindrical torso (40 kg, 20 cm average diameter, 160 cm tall) plus two rod-like arms (2.5 kg each, 70 cm long) attached to the outside of the torso. The skater then raises her arms straight above her head. In this latter orientation, she can be modeled as a 45 kg, 20-cm-diameter, 200-cm-tall cylinder.What is her new rotation frequency, in revolutions per second?Express your answer in revolutions per second.
A student sits on a freely rotating stool holding two dumbbells, each of mass 2.93 kg (see figure below). When his arms are extended horizontally (Figure a), the dumbbells are 1,09 m from the axis of rotation and the student rotates with an angular speed of 0.745 rad/s. The moment of inertia of the student plus stool is 2.64 kg m² and is assumed to be constant. The student puls the dumbbells inward horizontally to a position 0.307 m from the rotation axis (Figure b) 1 (a) Find the new anguler speed of the student. rad/s (b) Find the kinetic energy of the rotating system before and after he pulls the dumbbells inward. Koefore Kate"
A student sits on a rotating stool holding two 2.7-kg objects. When his arms are extended horizontally, the objects are 1.0 m from the axis of rotation and he rotates with an angular speed of 0.75 rad/s. The moment of inertia of the student plus stool is 3.0 kg · m2 and is assumed to be constant. The student then pulls in the objects horizontally to 0.38 m from the rotation axis. (a) Find the new angular speed of the student. rad/s 1.677 (correct)(b) Find the kinetic energy of the student before and after the objects are pulled in. before ?? after ???
In figure skating, kelen rotated at an angular speed of 9.04 rad/s with her arms pulled in. At the arena, watching her performance, a graduate student calculated that her moment of inertia with arms pulled in was 3.05 kmg^2. After 45 seconds, kelen extends her arms, and her angular speed changed to 4.37 rad/s. What is kelens new moment of inertia?
Divers change their body position in midair while rotating about their center of mass. In one dive, the diver leaves the board with her body nearly straight, then tucks into a somersault position. If the moment of inertia of the diver in a straight position is 14 kg ⋅ m2 and in a tucked position is 4.0 kg ⋅ m2, by what factor does her angular speed increase?
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 1.80 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 82.0 rpm with her arms outstretched, what will her angular velocity ?2 be (in rpm) 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.
A merry-go-round of radius R = 2.6 m has a moment of inertia I = 223 kg × m2, and is rotating at 10 rpm. A child whose mass is 44 kg jumps onto the edge of the merry-go-round with a speed of 4.5 m/s in a direction tangential to the rim of the MGR, and in the direction in which it is spinning. The new angular speed (in rpm) of the merry-go-round is approximately
Two kids, each with a mass of 25.0 kg, are standing at the edge of a merry-go-round. Treat both kids as point masses. The merry-go-round is a uniform disk with a mass of 97.5 kg and a radius of 1.25 meters, which is free to rotate about its center of mass without friction. The moment of inertia of a solid disk rotating about its center of mass is given by I = MR2 /2 , and the moment of inertia of a point mass is given by I = mr2 . The merry go round is initially rotating at 12.5 revolutions per minute (rpm). a) If both kids walk to the center of the merry-go-round, what will the final angular speed be, in rpm? Hint: use conservation of angular momentum. b) What is the change in the total kinetic energy of the disk and the two kids during this process? Give your answer in units of Joules (J)

SEE MORE QUESTIONS