Maria want to make a footstool in the shape of a cylinder, as show below. she wants to fill the footstool with foam and cover it with fabric. r=12in by h=18in

Volume = 8143.01 surface area =2261.95

Explanation:

V=

plug in variables

use PEMDAS &solve for v

12 squared=144

pi times 144 is approximately 452.39

V = 8143.01

A=

plug in variables, simplify, use PEMDAS to solve for A

a galvanic cell( aka voltaic cell) and electrolytic cell

explanation:

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a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure  

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.