(a) a simple model for a rubber band assumes that the rubber may be represented by polymer chain consisting of n links each of length x. assume that the links are weightless, and there is no interaction energy apart from the weak thermal coupling. the links all lie along the y-axis but they may be oriented in the + y or - y direction the ends of the chain are distance l apart. when the strip of rubber carries a load w, its energy e is related to the number of upward links n by e 2n^w. for an isolated rubber strip with energy e, write an number of states in terms of the numbern of upward links. (i) expression for the [2 marks write down an (11) expression for the entropy s as a function of n [2 marks (b) hence show that the equilibrium temperature t is given by 2 w t = n-n k ln [4 marks] (c) when the same model is used to represent a strip of rubber at constant temperature t, its average number of upward links n is found to be n= e2w/kt +1 compare the rela n and t in parts (a) and (b) s betv comment.

i believe the answer would be:

d. violin, clarinet, french horn, and tuba

ok

explanation:

it has to be b, about 97 percent.

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.