ATIVIDADE: 1Uma máquina recebe uma quantidade de calor Q= 5200 J e realiza um trabalho T= 1400j, seu rendimento será:

R=T/Q

2Uma máquina com rendimento de 50 % e recebe uma quantidade de calor Q= 5000j. ela realizará um trabalho T de:

R=T/Q

Which best represents the law of conservation of mass ?

The uniform slender bar rests on a smooth horizon- tal surface when a force f is applied normal to the bar at point a. point a is observed to have an initial acceleration aa of 20 m/s2, and the bar has a corre- sponding angular acceleration of 18 rad /s2. deter- mine the distance b.

The temperature at a point (x, y) is t(x, y), measured in degrees celsius. a bug crawls so that its position after t seconds is given by x = 6 + t , y = 8 + 1 3 t, where x and y are measured in centimeters. the temperature function satisfies tx(3, 9) = 5 and ty(3, 9) = 4. how fast is the temperature rising on the bug's path after 3 seconds? (round your answer to two decimal places.)