Your samples contained both Al and F, although the composition was not specified in this lab. Suppose you were given a second sample that contained the same amount of Al, but twice the amount of F. What changes would be observed in the data obtained in channel A, and how would this affect your calculated value for t1/2 of 20F ? There would be no observable changes in the data. The intensity of 20F signal would be higher, and the lifetime would be twice as long. The intensity of 20F signal would be higher, but the lifetime would be unchanged. The intensity of 28Al signal would be higher.

Aloaded platform of total mass 500 kg is supported by a dashpot and by a set of springs of effective stiffness 72 kn/m. it is observed that when the platform is depressed through a distance x = 12.5 cm below its equilibrium position and then released without any initial velocity; it reaches its equilibrium position in the shortest possible time without overshoot. find the position and velocity of the loaded platform 0.10 sec. after its release. if a further load of 400 kg is added to the platform, find, i) the frequency of damped vibrations, and i) the amplitude of vibration after 2 complete oscillations, given that the initial amplitude is 15 cm.

Ifa component is made of two or more materials with different modulus of elasticity (e), it is called a composite member and we calculate the factor·n". mention the formula for calculating n". also, ifn> 1, explain what will happen to the 1. transformed.gi) ifn 1, what will happen to the material when transformed material when

Agas mixture consists of 8 kmol of h2 and 2 kmol of n2. determine the mass of each gas and the apparent gas constant of the mixture.