An ice skater starts to spin with her arms outstretched. She then gently brings her arms in, and finds she spins quicker (assume no friction between skates and ice). As she is bringing in her arms, which of the following changes take place (choose all or any applicable). ☐ Her rotational kinetic energy increases. Her rotational kinetic energy decreases Her angular momentum increases Her angular momentum decreases
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- having negligible masses in the figure, and Solid rods running along the y-axis connect the three particles. If this system rotates around the x-axis with an angular velocity of 3.00 rad/s, what would be the total rotational kinetic energy? 4.00 kg y = 3.00 m 12 - 2.00 kg y - -2.00 m 3.00 kg y = -4.00 m A) 765 J B) 231 J C) 265 J D) 357 J E) 414 JHelpAn 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. L increases, K increases B. L increases, K remains constant C. L remains constant, K increases D. L remains constant, K remains constant
- ind the Angular speed (?) of a wind turbine turning at a rate of 85 revolutions per minute. Give Exact Answer with Correct Units for “Angular Speed (?) ”: Show formula Used:A block of 50 kg is attached to a cable. The cable is then attached to a rotating assembly with a mass moment of inertia of 10 kg-m^2. The bearing friction applied at the rotating assembly is equivalent to a couple of 50 N-m CCW. The block's initial downward speed is 1 m/s. 0.5 m 50 kg 3. Which of the following is closest to the work done by the weight of the 50-kg block after the rotating assembly has rotated 0.8 radians CW? 196.2 J 105.7 J -196.2 J -135.4 J he following is closest to the total work done by the system after the rotating rotated 0.8 rad CW? 5. Which of the following is closest to the speed of the 50-kg block after the rotating assembly rotated 0.8 rad CW?A baton twirler throws a spinning baton directly upward. As it goes up and returns to the twirler’s hand, the baton turns through 2.9 revolutions. Ignoring air resistance and assuming that the average angular speed of the baton is 8.7 rad/s, determine the height to which the center of the baton travels above the point of release.
- Asap likeA 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 2mA diver makes 2.5 revolutions on the way from a 11- m-high platform to the water. Assuming zero initial vertical velocity, find the diver's average angular velocity during a dive. Number i Units
- Rotational quantities must be treated as vectors for general rotational motion, such as when the axis of rotation can change directions. Use the right hand rule for angular velocity to determine the direction of the angular velocity for the motion shown below. +y +x +z (out) O +x O zero O -y O +z O +y O -x -z O o o o o oA 1.10-kg particle moves in the xy plane with a velocity of Need Help? Read It = (3.70 1-3.70 ĵ) m/s. Determine the angular momentum of the particle about the origin when its position vector is = (1.50 î+ 2.20 ĵ) m. k) kg - m²/s Watch ItThank you. Shouldn't rotational kinetic energy be used, though, for part (b)?