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Compared with the mass of a dozen eggs, the mass of air in an empty refrigerator is 1. negligible. 2. about a tenth as much. 3. about the same. 4. more.

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Presentation on theme: "Compared with the mass of a dozen eggs, the mass of air in an empty refrigerator is 1. negligible. 2. about a tenth as much. 3. about the same. 4. more."— Presentation transcript:

1 Compared with the mass of a dozen eggs, the mass of air in an empty refrigerator is 1. negligible. 2. about a tenth as much. 3. about the same. 4. more.

2 Compared with the mass of a dozen eggs, the mass of air in an empty refrigerator is

3 Consider a flexible plastic bottle containing both air and water immersed neck down in an open dish of water. The water level in the bottle will 1. fall if pinched at A but rise if pinched at B. 2. fall if pinched at A or at B. 3. fall if pinched at A but stay where it is if pinched at B. 4. rise if pinched at A but stay where it is if pinched at B. 5. stay where it is if pinched at A or at B.

4 Consider a flexible plastic bottle containing both air and water immersed neck down in an open dish of water. The water level in the bottle will

5 In the presence of air, the small iron ball and large plastic ball balance each other. When air is evacuated from the container, the larger ball 1. rises. 2. falls. 3. remains in place.

6 In the presence of air, the small iron ball and large plastic ball balance each other. When air is evacuated from the container, the larger ball

7 Consider a Ping-Pong ball floating in a glass of water that is in an air-tight chamber. When air pressure is increased in the chamber, does the ball float lower, higher, or as before? 1. Lower 2. Higher 3. As before

8 Consider a Ping-Pong ball floating in a glass of water that is in an air-tight chamber. When air pressure is increased in the chamber, does the ball float lower, higher, or as before?

9 Consider an air-filled balloon weighted so that it is on the verge of sinkingthat is, its overall density just equals that of water. Now if you push it beneath the surface, it will 1. sink. 2. return to the surface. 3. stay at the depth to which it is pushed.

10 Consider an air-filled balloon weighted so that it is on the verge of sinkingthat is, its overall density just equals that of water. Now if you push it beneath the surface, it will

11 A pair of identical balloons are inflated with air and suspended on the ends of a stick that is horizontally balanced. When the balloon on the left is punctured, the balance of the stick is 1. upset and the stick rotates clockwise. 2. upset and the stick rotates counter-clockwise. 3. unchanged.

12 A pair of identical balloons are inflated with air and suspended on the ends of a stick that is horizontally balanced. When the balloon on the left is punctured, the balance of the stick is

13 A short and a long candle burn in an open jar as shown. When the jar is covered the candle to go out first will be 1. the short candle. 2. the tall candle , a toss up.

14 A short and a long candle burn in an open jar as shown. When the jar is covered the candle to go out first will be

15 Water with air bubbles flows through a pipe that becomes narrower. In the narrow region the water gains speed and the bubbles are 1. larger. 2. smaller. 3. the same size.

16 Water with air bubbles flows through a pipe that becomes narrower. In the narrow region the water gains speed and the bubbles are

17 Youre driving in a convertible car with the top up and the windows closed. You note that the fabric top puffs up. To explain this interesting phenomenon you invoke 1. Bernoullis principle 2. Newtons laws 3. Both

18 Youre driving in a convertible car with the top up and the windows closed. You note that the fabric top puffs up. To explain this interesting phenomenon you invoke


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