29. As a bicycle pump inflates a tyre, it pressure rises from 30 kPa to 40 kPa at constant temperature of 30 °C. By assuming the air acts as an ideal gas, calculate the work done per mol of the air. A. -80.35 J
B. 80.35 J
C. -811.93 J
D. 811.93 J C

(please show calculation)

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

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.

What is the answer to these problems 30 pt