physics Give me a solution 8. How will the value of angular momentum change if the mass and angular velocity is maintained but the radius of the circular path is reduced to half the original? A. Angular momentum will decrease by a factor of four. B. Angular momentum will be doubled. C. Angular momentum will be halved. D. Angular momentum will increase by a factor of four.

An ice skater is spinning about a vertical axis with arms fully extended. If the arms are pulled in closer to the body, in which of the following ways are the angular momentum and kinetic energy of the skater affected? a.) angular momentum increases and kinetic energy increasing b.) Angular momentum remains constant and kinetic energy increases c.) angular momentum increases and kinetic energy remains constant. d.) angular momentum remains constant and kinetic energy remains constant.

I drive a Nissan Leaf to work. With the e-pedal on, the motor recovers energy through braking very aggressively. I need about 7 KW-hour to come to school if I use mostly the freeways. That’s about 5 KW-hour if I take mostly local streets. From the energy perspective, can you offer an explanation to explain this difference?

A disk at rest experiences a constant angular acceleration for t = 35 s, at the end of which it is spinning with a frequency of f = 35 rpm. Please answer the following questions. 1) Write an expression for the magnitude of the angular velocity of the disk after the acceleration in terms of the frequency. ω = 2) Calculate the magnitude of the angular velocity of the disk in rad/s at time t = 35 s. ω = 3) Write an expression for the average angular acceleration of the disk αave in terms of angular velocity.  αave =

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6. Spinning Ice Skater: A 50 kg ice skater is spinning around at 2 revolutions per second with her arms tucked in. You may consider her to be a cylinder 1.5 meters high with a radius of 15 cm. She sticks her arms straight out to slow herself down. Each of her arms is 2 kg and 75 cm long. How fast does she rotate with her arms extended?

#1. Due to the conservation of angular momentum, moving mechanical parts in a spacecraft can affect the orientation and rate of angular rotation of the craft. Let us, crudely speaking, model Voyager II as a uniform disk with a mass of 720 kg and an effective radius of 1.0 meters. What is the moment of inertia of Voyager II under these assumptions? A.720kgm^2 B.580kgm^2 C.360kgm^2 D.180kgm^2 #1-1. Suppose the spacecraft in #1 is initially not rotating as a whole, and none of its compo- nents are rotating. A data tape spool with a moment of inertia of 1.25 × 10^−4 kg m^2 begins to spin at a rate of 15.5 Rad/s. What is the angular momentum of the spacecraft as a whole? A. 3.88×10^−3 kg·m^2/s B. 1.94×10^−3 kg·m^2/s C. 9.69×10^−4 kg·m^2/s D. 0.0 kg·m^2/s # 1-3. As the result of the tape spool operation, what is the magnitude of the angular speed of the spacecraft in #1-1 as a whole? A. 0.0 Rad/s B. 5.38 × 10^−6 Rad/s  C. 1.07 × 10^−5 Rad/s D. 2.14 × 10^−5 Rad/s

2. A mass is moving on xy plane as shown in the Figure. Find the angular momentum of the mass about the origin. y (0, 70) (- 50, 0) (0,0) v = 100 m/s m = 2 kg

An ice skater, whose rotational inertia is I = 4 kg·m2 with her arms close to her body, is spinning at 2 rad/s. She then fully extends her arms, changing her rotational inertia to 8 kg·m2. Which of the following is true? a.) Her angular momentum remains the same. b.) Her angular velocity decreases.     c.) Her kinetic energy decreases. d.) All of the above. e.) B and C. d.) None of the above.

Planet earth orbits around the Sun and also spins on it's own axis.What would the angular momentum in kilograms meters squared per second of the Earth in it's orbit around the Sun and Earth spinning on it's axis?