Write a program that prompts the user to enter a social security number as a string in the format ddd-dd- where d is a digit from 0 to 9. the rightmost character can be from 0 to 9 as well as a to z. the program should check whether the input is valid and in the correct format (there’s a dash after the first 3 digits and after the second group of 2 digits).

What is a monomer? how do they form a ploymer from the view point of chemical bonding?

Arigid tank contains 10 kg of air at 137 kpa (abs) and 21°c. more air is added to the tank until the pressure and temperature rise to 242 kpa (abs) and 32°c, respectively. determine the amount of air added to the tank. [r-0.287 kj/kg k]

Acarnot refrigerator operates in a room in which the temperature is 21°c and of power when operating. if the food compartment of the refrigerator is consumes 3 kw to be maintained at 2°c, determine (a) the coefficient of performance of the cycle and (b) the rate of heat removal from the food compartment. refrigerator cycle that has a higher coefficient of performance than that of the discussed (e) is it possible to develop a carn ot refrigerator, operating between the same temperature limits? explain