An electric sander consisting of a rotating disk of mass 0.7 kg and radius 10 cm rotates at 15 rev/sec. When applied to a rough wooden wall the rotation rate decreases by 20%. What is the final rotational kinetic energy of the rotating disk?

Suppose a 175 kg motorcycle is heading toward a hill at a speed of 34 m/s. The two wheels weigh 12 kg each and are each annular rings with an inner radius of 0.280 m and an outer radius of 0.330 m. a) how high can it coast up the hill, if you neglect friction in m? b) how much energy is lost to friction if the motorcycle only gains an altitude of 39m before coming to rest?

NE Chapter 10, Problem 062 Z Your answer is partially correct. Try again. In the figure, three 0.07 kg particles have been glued to a rod of length L = 5 cm and negligible mass and can rotate around a perpendicular axis through point O at one end. How much work is required to change the rotational rate (a) from 0 to 20.0 rad/s, (b) from 20.0 rad/s to 40.0 rad/s, and (c) from 40.0 rad/s to 60.0 rad/s? (d) What is the slope of a plot of the assembly's kinetic energy (in joules) versus the square of its rotation rate (in radians-squared per second-squared)? Axis (a) Number Units 0.0010110 (b) Number Units 0.030 (c) NumberTo.050 Units (d) Number UnitšT kg-m 2 m Click if you would like to Show Work for this question: Open Show Work em

An automobile wheel has a mass of 17 kg and a diameter of 0.25 m. What is the total kinetic energy of one wheel when the car is traveling at 19.4 m/s? You may treat the wheel as a solid disk.