1. An ice skater is spinning about a vertical axis with her arms fully extended. If...
1. An ice skater is spinning about a vertical axis with her arms fully extended. If her arms are pulled in closer to her body, in which of the following ways are the angular momentum and kinetic energy of the skater affected?
Angular Momentum- Kinetic Energy
A) Increases-Increases
B) Increases-Remains constant
C) Remains constant- Increases
D) Remains constant-Remains constant
Homework Answers
According to the concept of the law of the conversation of the angular momentum
If their is no external torque in the both cases
So the angular momentum remains constant
The kinetic energy increases because the moment of inertia of decreases
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1. An ice skater is spinning about a vertical axis with
her arms fully extended. If...
3. An ice skater starts spinning at a rate of 2.0 rev/s with their arms extended....
3. An ice skater starts spinning at a rate of 2.0 rev/s with their arms extended. They then pull their arms in toward their body reducing their moment of inertia by ¼, what is the angular velocity of the skater with their arms pulled in?
6. A figure skater is spinning slowly with arms outstretched. She brings her arms in close...
6. A figure skater is spinning slowly with arms outstretched. She brings her arms in close to her body and her angular speed increases dramatically. The increase in angular speed is a demonstration of: (A) Conservation of angular momentum. (B) Conservation of momentum. (C) Conservation of total energy. (D) Conservation of kinetic energy. (E) Conservation of mechanical energy.
The 160 lb ice skater with arms extended horizontally spins about a vertical axis with a...
The 160 lb ice skater with arms extended horizontally spins about a vertical axis with a rotational speed of 1 rev/sec. Estimate his rotational speed if he fully retracts his arms, bringing his hands very close to the centerline of his body. As a reasonable approximation, model the extended arms as uniform slender rods, each of which is 27 in. long and weighs 13 lb. Model the torso as a solid 134-lb cylinder 13 in. in diameter. Treat the man...
3. An ice skater is spinning counterclockwise about a vertical axis when viewed from above. What...
3. An ice skater is spinning counterclockwise about a vertical axis when viewed from above. What is the direction of her angular-momentum vector? Explain.
A skater is spinning about a fixed symmetrical vertical axis. When she lifts her arms above...
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Question 8 (6 points) A 60.0-kg skater is spinning at 0.800 rev/s with her arms and legs extended outward. In this position her moment of inertia with respect to the vertical axis about which she is spinning is 6.00 kg•m?. She pulls her arms and legs in close to her body changing her moment of inertia to 2.00 kg•m². What is her final angular velocity in rad/s? a) 8.71 rad/s b) 15.1 rad/s c) 2.40 rad/s d) 0.800 rad/s e)...
A 50 kg ice skater spins about a vertical axis through her body with her arms...
A 50 kg ice skater spins about a vertical axis through her body with her arms horizontally outstretched, making 2.5 turns each second. The distance from one hand to the other is 1.50 m. Biometric measurements indicate that each hand typically makes up about 1.25 % of body weight. What horizontal force must her wrist exert on her hand? Express the force in part (a) as a multiple of the weight of her hand.
An ice skater spinning with outstretched arms has an angular speed of 5.0rad/s . She tucks...
An ice skater spinning with outstretched arms has an angular speed of 5.0rad/s . She tucks in her arms, decreasing her moment of inertia by 29% . What is the resulting angular speed? rad/s By what factor does the skater's kinetic energy change? (Neglect any frictional effects.) where does the extra kinetic energy come from?
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9.An ice skater extends her arms as quickly turns on itself. Does your kinetic energy is conserved? Does your mechanical energy is conserved? Does your angular momentum is conserved? (Neglect friction in the range of time it takes to extend the arms.) If any of these magnitudes is not retained say whether increases or decreases.
Kim is spinning on the ice at 20 rad/s about her longitudinal axis when she abducts...
Kim is spinning on the ice at 20 rad/s about her longitudinal axis when she abducts her arms and doubles her radius of gyration about her longitudinal axis from 30 em to 60 cm. If her angular momentum is conserved, what is her angular velocity about her longitudinal axis after she increases her radius of gyration?
3. An ice skater starts spinning at a rate of 2.0 rev/s with their arms extended. They then pull their arms in toward their body reducing their moment of inertia by ¼, what is the angular velocity of the skater with their arms pulled in?
6. A figure skater is spinning slowly with arms outstretched. She brings her arms in close to her body and her angular speed increases dramatically. The increase in angular speed is a demonstration of: (A) Conservation of angular momentum. (B) Conservation of momentum. (C) Conservation of total energy. (D) Conservation of kinetic energy. (E) Conservation of mechanical energy.
3. An ice skater is spinning counterclockwise about a vertical axis when viewed from above. What is the direction of her angular-momentum vector? Explain.
Question 8 (6 points) A 60.0-kg skater is spinning at 0.800 rev/s with her arms and legs extended outward. In this position her moment of inertia with respect to the vertical axis about which she is spinning is 6.00 kg•m?. She pulls her arms and legs in close to her body changing her moment of inertia to 2.00 kg•m². What is her final angular velocity in rad/s? a) 8.71 rad/s b) 15.1 rad/s c) 2.40 rad/s d) 0.800 rad/s e)...
Kim is spinning on the ice at 20 rad/s about her longitudinal axis when she abducts her arms and doubles her radius of gyration about her longitudinal axis from 30 em to 60 cm. If her angular momentum is conserved, what is her angular velocity about her longitudinal axis after she increases her radius of gyration?
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