Consider the following four objects: a hoop, a flat disk, a solid sphere, and a hollow sphere. each of the objects has mass m and radius r. the axis of rotation passes through the center of each object, and is perpendicular to the plane of the hoop and the plane of the flat disk. which of these objects requires the largest torque to give it the same angular acceleration?

Determine the fraction of the magnitude of kinetic energy lost by a neutron (m1 = 1.01 u) when it collides head-on and elastically with a target particle at rest which is 21h (heavy hydrogen, m = 2.01 u).

What are two different ways you could find the value of a? explain these methods.

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.