## Monday, 8 September 2014

### ATMOSPHERIC PRESSURE

ATMOSPHERIC PRESSURE

1. Explain how rubber suckers could be used to help lift panes of glass safely.

2. If you wanted to hang from the ceiling using a rubber sucker how big would it have to be?
(Assume a perfect vacuum in the sucker. Take atmospheric pressure to be 100 000 Pa and use your own weight in Newtons Take g for the Earth as 10 N/kg).

3. On of the windows in a plane flying at high altitude breaks. Explain what happens.

4. Water has a lower density than mercury. Is the column of liquid in a mercury barometer taller or shorter than one in a barometer using water?

5. If the density of water is 1000 kg/m3 and atmospheric pressure is 100 000 Pa how high will the column of water in a perfect water barometer be. (Take g for the Earth as 10 N/kg)

6. Explain what would happen to an astronaut doing a space walk if their space suit was punctured by a tiny meteorite.

7. What would happen to the mercury level in a mercury barometer if:
(a) the atmospheric pressure went down
(b) the atmospheric pressure went up
(c) a little air leaked into the tube above the mercury
(d) the barometer was taken up a high mountain
(e) the temperature of the room where the barometer was got higher
[Remember that mercury is a dangerous substance. It should not be used by pupils and you should certainly not heat it]

8. A high altitude weather balloon is partly inflated on the ground. What would happen to it as it rose up through the air? Explain your answer using a diagram as well if you wish.

9. Find out what is meant by:
(a) a millibar      (b) an isobar      (c) a cyclone       (d) an anticyclone