BackThe 1100-kg mass of a car includes four tires, each of mass 35 kg (including wheels) and diameter 0.80 m. Assume each tire and wheel combination acts as a solid cylinder. Determine the fraction of the kinetic energy in the tires and wheels.
A merry-go-round has a mass of 1240 kg and a radius of 7.50 m. How much net work is required to accelerate it from rest to a rotation rate of 1.00 revolution per 7.00 s? Assume it is a solid cylinder.
Two ice skaters, both of mass 68 kg, approach on parallel paths 1.6 m apart. Both are moving at 3.5 m/s with their arms outstretched. They join hands as they pass, still maintaining their 1.6-m separation, and begin rotating about one another. Treat the skaters as particles with regard to their rotational inertia. Calculate the change in kinetic energy for this process.
Hurricanes can involve winds in excess of 120km/h at the outer edge. Make a rough estimate of the energy, of such a hurricane, approximating it as a rigidly rotating uniform cylinder of air (density 1.3 kg/m3) of radius 85 km and height 4.5 km.
(II) Estimate the kinetic energy of the Earth with respect to the Sun as the sum of two terms, that due to its daily rotation about its axis, [Assume the Earth is a uniform sphere with mass = 6.0 x 1024 kg, radius = 6.4 x 106 m, and is 1.5 x 108 km from the Sun.]
(II) Estimate the kinetic energy of the Earth with respect to the Sun as the sum of two terms, that due to its yearly revolution about the Sun. [Assume the Earth is a uniform sphere with mass = 6.0 x 1024 kg, radius = 6.4 x 106 m, and is 1.5 x 108 km from the Sun.]
(III) The 1100-kg mass of a car includes four tires, each of mass 35 kg (including wheels) and diameter 0.80 m. Assume each tire and wheel combination acts as a solid cylinder. If the car is initially at rest and is then pulled by a tow truck with a force of 1500 N, what is the acceleration of the car? Ignore frictional losses.
The rotational energy levels of CO are calculated in Example . If the energy of the rotating molecule is described by the classical expression , for the level, what is the rotational period (the time for one rotation)?