Consider a piston-cylinder assembly in which air expands adiabatically from an initial state where pi= 100 lbf/in, u = 3.704 f/ib, and t = 1000°r, to a final state where p2 30 lb/in". the process is polytronic with n=1.4. the change in specific internal energy (in turib), can be expressed in terms of temperature change as au - (0.171)(12 - 11). determine the final temperature in "r). neglect kinetic and potential energy effects.

Two pans of a balance are 24.1 cm apart. the fulcrum of the balance has been shifted 1.33 cm away from the center by a dishonest shopkeeper. by what percentage is the true weight of the goods being marked up by the shopkeeper? assume the balance has negligible mass. answer in units of %.

Two cans on a sunny window one black and the other white construct and explanation of the effect of sun will have on both cans over a two hour period?

When a charged balloon sticks to a wall, the downward gravitational force is balanced by an upward static friction force. the normal force is provided by the electrical attraction between the charged balloon and the equal but oppositely charged polarization induced in the wall's molecules. if the mass of a balloon is 1.2 g, its coefficient of static friction with the wall is 0.71, and the average distance between the opposite charges is 0.80 mm, what minimum amount of charge must be placed on the balloon in order for it to stick to the wall? express your answer to two significant figures and include appropriate units.