Compute kinetic energy of system after dumbbells are pulled

Reference no: EM13548980

On an old-fashioned rotating piano stool, a woman sits holding a pair of dumbbells at a distance of 0.595m from the axis of rotation of the stool. She is given an angular velocity of 3.05rad/s , after which she pulls the dumbbells in until they are only 0.195mdistant from the axis. The woman's moment of inertia about the axis of rotation is 4.90 and may be considered constant. Each dumbbell has a mass of 4.85kg and may be considered a point mass. Neglect friction. What is the initial angular momentum of the system? What is the angular velocity of the system after the dumbbells are pulled in toward the axis? Compute the kinetic energy of the system before the dumbbells are pulled in Compute the kinetic energy of the system after the dumbbells are pulled in.

Reference no: EM13548980

Questions Cloud

Block on frictionless horizontal surface-pulling the cord : A small block on a frictionless horizontal surface has a mass of 2.25×10?2kg . It is attached to a massless cord passing through a hole in the surface. (See the figure below (Figure 1) .) The block is originally revolving at a distance of 0.255m from..

What is the voltage supplied to the recharger : A transformer with a turns ratio (secondary:primary) of 1:81 is used to step down the voltage from a 120-V wall socket to be used in a battery recharging unit. What is the voltage supplied to the recharger? V

What is the new angular momentum of the rod : A majorette in a parade is performing some acrobatic twirlings of her baton. Assume that the baton is a uniform rod of mass 0.120kg and length 80.0m With a skillful move, the majorette changes the rotation of her baton so that now it is spinning abou..

What is his final angular speed : The outstretched hands and arms of a figure skater preparing for a spin can be considered a slender rod pivoting about an axis through its center. (See the figure below (Figure 1) .) When the skater's hands and arms are brought in and wrapped arou..

Compute kinetic energy of system after dumbbells are pulled : On an old-fashioned rotating piano stool, a woman sits holding a pair of dumbbells at a distance of 0.595m from the axis of rotation of the stool. She is given an angular velocity of 3.05rad/s , after which she pulls the dumbbells in until they ar..

What rate is its angular momentum changing : A certain drawbridge can be modeled as a uniform 1.60×104N bar, 10.0m long, pivoted about its lower end. When this bridge is raised to an angle of 60.0 above the horizontal, the cable holding it suddenly breaks, allowing the bridge to fall. At the..

Assume all temperatures to be exact and neglect significant : Assume all temperatures to be exact, and neglect significant figures for small changes in dimension. Concrete highway slabs are poured in lengths of 9.00m. How wide should the expansion gaps between the slabs be at a temperature of 15degreeC to ensur..

Calculate mass-angle of application to produce equilibrium : A student was given two forces and asked to find a single force that would produce equilibrium with the two forces. The two forces were given by providing one of the components and the angle the force made with the positive x axis. The two forces ..

Doublet in the second-order spectrum : A line in the spectrum of a certain element is a doublet with wavelengths 526.4 and 527.2 nm. Calculate the minimum number of lines needed in a grating that will resolve this doublet in the second-order spectrum.

User Account

All Pages