Turner's treadmill starts with a velocity of -3.1 m/s and speeds up at regular intervals during a half-hour workout. After 21 min, the treadmill has a velocity of -7.4 m/s. What is the average acceleration of the treadmill during this period? Answer in units of m/s2

electrical power

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

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when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.