A gas cylinder of volume 0.052 m3 contains oxygen gas at a temperature of 22°C and a pressure of 2.0 × 105 Pa. Some of the oxygen in the cylinder is used and the gas pressure falls to 1.6 × 105 Pa. The temperature remains constant. Calculate the number of molecules removed from the cylinder

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Blood pressure the total amount of blood the heart pumps in one minute 2. cardiac output the number of times your heart beats in a minute 3. dilate the amount of blood that the heart can pump in a single beat 4. heart rate the force exerted on the walls of the blood vessels by the blood that moves through them 5. stroke volume to widen or get larger in size

Which of these has some mechanical energy? a. an atom b. heat inside earth c. a book on a shelf d. the fire from a lit match