!: (a) 20 cm: 80

10. Some mercury is poured into a capillary tube of

uniform bore and one end closed. When the tube

is held horizontally, mercury column has a length

of 4 cm and air enclosed in the closed end has a

length of 10 cm. If the tube is now held vertically,

with open end upwards, the length of the air

column will be (take atmospheric pressure at the

Tale place of experiment to be 760 mm)

(a) 10.5 cm . (6) 8.5 cm ",JI

(c) 9.0 cm mati (d) 9.5 cm 0

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

: )

a. energy is absorbed in the reaction.

if in a given reaction the energy of products is greater than the energy of reactants it means that reaction is endothermic and during the reaction, the energy is absorbed by reactants. in an endothermic reaction, the products have more stored chemical energy than the reactants. and in this reaction the reactants are more stable than products before the compounds with less energy are always more stable.

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.