Best Bus, a bus company from Austin Texas would like to acquire a new bus. Somebody working at Best Bus found a nice second hand bus at Ebay (see the picture) for a reasonable price. When the president of the company sees the picture: "Yes man, this is a nice good looking bus, and pretty cheap too, but think man I never can satisfy my customers with such a bus." Why not?

At a particular ice cream van two types of ice creams are being sold. The small one costs 1 dollar, the big one 2 dollars. Marsha puts an amount of 2 dollars one the counter and gets without asking the big ice cream. Martha also would like to have an ice cream. She also puts an amount of 2 dollars on the counter. Then the ice cream seller asks her which ice cream she would like to have. Assuming that the persons do not know each other, how can you explain their behavior.

At the same time a block of iron and an equally heavy iron sphere are released from the top of a slope. Assume that the friction between the slope has a negligible effect on the velocity of the block and the sphere. Which of the two will be down first?