A skater spins about a fixed point on the ice. She begins with her arms extended and an initial angular velocity wo . She then pulls her arms in to her body. After her arms are pulled to her body, she spins with an angular velocity final ,wf . Throughout the time she is spinning, no external forces are acting in the horizontal plane. How do the magnitudes of the initial and final angular velocities compare? O A. WO > Wf В. WO = wf W0 < wf Е.

6. 11m0.03 to studen 16 quiben a csri s nuo sie 2. A truck has tires with a radius of 40.0cm. If the vehicle is driven 80,000 km (80,000,000 m) before the tires are replaced, a. What angle did the tires rotate through? b. If the vehicle traveled at an average velocity of 15.0m/s, what was the average angular velocity of a point on the tire's edge? c. What was the average centripetal acceleration that a point on the edge of one of those tires experienced during that time?

A cable lifting an elevator (600-kg) is wrapped around a 1.0-m diameter cylinder (20-kg) that is turned by the elevator's motor. The elevator is moving upward at a speed of 2.0-m/s then slows to a stop. (Note: I(cylinder)= 1⁄2 M R?) a. What is the angular acceleration (a) of the cylinder? b. What are the initial and final angular velocities (w) of the rotor. c. What angle (Dq) does the cylinder cover while stopping? d. How long does it take to stop the elevator?

1 on s page A leg swings from the hip through 89.3 deg in 0.66 seconds. Calculate the angular velocity of the leg around the hip to 2 decimal places in radians / s. Answer: Check N P 4 Next page 8°C Light rain A4 21:08 03/12/2023 Q

(d) and (e) please

A 0.500-kg ball that is tied to the end of a 1.50-m light cord is revolved in a horizontal plane with the cord making a 0 angle with the vertical. If the tangential speed of the ball is 4.00 m/s, what angle does the cord make with the vertical? e.

An ice skater with moment of inertia, I is rotating with angular speed, W. The skater pulls her arms inward, thus decreasing her moment of inertia by I /2. What is her angular speed?

Suppose a flywheel originally has an angular velocity of 45.0 rad/s in the counterclockwise sense. After a period of uniform angular acceleration, the flywheel has an angular velocity of 90.0 rad/s in the clockwise sense. What its average angular velocity during the period of uniform angular acceleration? A. 45.0 rad/s (counterclockwise) B. 45.0 rad/s (clockwise) C. 22.5 rad/s (counterclockwise) D. 22.5 rad/s (clockwise)

A monkey has a 50 cm long tail swinging through circular arcs. a. The moneky prepares to swing through a semicircular arc by grabbing a branch 50 cm in front.What is the angular acceleration as she begin to drop? b. What is the monkeys linear speed at the bottom of this arc, 50 sm below starting point? What is her angular speed? c. The monkey has a mass of 10 kg. What is the tension in her tail at the bottom of the arc?

A figure skater performs a twisting jump. She rotates around her longitudinal axis 2 times in 0.65 s. What was her average angular velocity in radians/second? A 720rad/s B 19.3rad/s C 4? rad/s D 9.67 rad/s E 1107 rad/s

3. A telephone pole has been knocked over by the wind so that it makes an angle of 0 with the vertical. The wind has stopped blowing and the pole is to be cut down as shown. nail L cut Once the cut is across most of the thickness of the pole, the pole begins to tip over. As the pole tips, the bottom of the pole stays attached to the base by the remaining part of the pole that was not cut (but the torque from the base on the tipping pole is negligible). There is a nail (of negligible mass) on the pole located a distance x. The length of the pole from the cut to the top is L. Remember that the moment of inertia of a stick of mass m and length L about its end is mL?.

A figure skater performs a twisting jump. She rotates around her longitudinal axis 2 times in 0.65 s. What was her angular displacement in radians? A 4 В D 720 E 2m

A 45.0-cm diameter disk rotates with a constant angular acceleration of 2.50 rad/s2. It starts from rest at t = 0, and a line drawn from the center of the disk to a point P on the rim of the disk makes an angle of 57.3° with the positive x-axis at this time. At t = 30 s, find a. Draw a diagram of the problem. b. the angular speed of the wheel. c. the linear speed and tangential acceleration of P.