Disk a, with a mass of 2.0kg and a radius of 80cm , rotates clockwise about a frictionless vertical axle at 20rev/s . disk b, also 2.0kg but with a radius of 30cm , rotates counterclockwise about that same axle, but at a greater height than disk a, at 20rev/s . disk b slides down the axle until it lands on top of disk a, after which they rotate together. part a after collision, what is their common angular speed (in rev/s)? part b and in which direction do they rotate? a) clockwise b) counterclockwise

Calculate the heat capacity per object when the total energy is 4 quanta. (think of this in terms of increasing from 3.5 quanta of energy in the system to 4.5 quanta of energy in the system, if that were possible.) c4 = __ j/k/object

Alarge cruise ship of mass 7.00 ✕ 107 kg has a speed of 11.6 m/s at some instant. (a) what is the ship's kinetic energy at this time? (b) how much work is required to stop it? (give the work done on the ship. include the sign of the value in your answer.) (c) what is the magnitude of the constant force required to stop it as it undergoes a displacement of 3.00 km?

Emmy kicks a soccer ball up at an angle of 45° over a level field. she watches the ball's trajectory and notices that it lands, two seconds after being kicked, about 20 m away to the north. assume that air resistance is negligible, and plot the horizontal and vertical components of the ball's velocity as a function of time. consider only the time that the ball is in the air, after being kicked but before landing. take "north" and "up" as the positive ‑ and ‑directions, respectively, and use ≈10 m/s2 for the downward acceleration due to gravity.