Little Johnny, after a science lesson on the laws of gravity, returned home, determined to prove his teacher Mr. Knowles wrong."Not everything that goes up comes back down, and I'll prove it!" After some brainstorming, he placed a bowl of water in the 12 PM, windless, Sunday sun, and watched as it evaporated. "It all went up," he said. The next day at school, he confronted his teacher about his little science project. But Mr. Knowles told Little Johnny that he was a bit short-sighted. How so?

Sobre transformações cíclicas, são feitas algumas afirmações, determine quais estão corretas. i – a variação de energia interna em uma transformação cíclica é nula; ii – o trabalho, em uma transformação cíclica, é sempre positivo; iii – ao completar um ciclo, o gás tem a mesma temperatura com a qual começou a transformação; iv – uma transformação cíclica é, obrigatoriamente, composta de transformações conhecidas, como adiabática, isocórica, etc: a) i e iii b) i e ii c) ii e iii d) i e iv e) iii e iv

Infrared radiation has wavelengths that are shorter than visible light is part of the visible light spectrum has wavelengths that are longer than visible light has the same wavelengths as ultraviolet radiation

Use the profile illustrated for problem (1). assume that the layer of silty sand fill (sm) is placed over the entire site. estimate the thickness of the fill (h - in feet) that will cause the effective vertical stress at the center of the clay layer to increase by 517.5 pounds per square foot.