2. Answer the following. ) State the significance of unit vector.h​

Answer:

Pressure on the piston=  

A/F

​

Force F=m×a

              =2000×9.8            

Area of cross section A=2.25×[tex]10^{-2} m^{2}[/tex]  

Therefore the pressure P=  

(2.25×[tex]10^{-2}[/tex] )/(2000×9.8)

​

P=0.8711×10 Pascal

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Given

Mass (m) = 2000 kg

Area of cross-section (A) = 2.25 × [tex]10^{-2}[/tex] [tex]m^{2}[/tex]

Acceleration due to gravity (a) = 9.8 m/[tex]s^{2}[/tex]

To find

The maximum pressure (P) that the smaller piston can bear.

Solution

In order to solve this question correctly and easily, we can follow the given steps.

From what knowledge we have of this chapter in Physics we know that to calculate the pressure we first have to find the force (F).

We are going to use the value of acceleration due to gravity as 9.8 m/[tex]s^{2}[/tex] because it has not been stated otherwise.

So,

Force (F) = m × a

               = 2000 kg × 9.8 m/[tex]s^{2}[/tex]

               = 19600 N

Thus, the force has been calculated to be 19600.

We know that,

Pressure (P) = [tex]\frac{F}{A}[/tex]

                    = [tex]\frac{19600}{2.25*10^{-2} }[/tex]

                    = 0.8711 × [tex]10^{6}[/tex] [tex]\frac{N}{m^{2} }[/tex]

Thus, the maximum pressure the smaller piston would have to bear will be 0.8711 × [tex]10^{6}[/tex] [tex]\frac{N}{m^{2} }[/tex].    

Answer:

eat,ate,eaten

put, put, put

catch, caught,caught

work,worked,worked

write,wrote,written

is,was/were, been

talk,talked, talked

ride,rode, ridden

drink,drank, drunk

walk,walked,walked

look,looked,looked

see,saw,seen

sit,sat,sat

keep,kept, kept

forget, forgot, forgotten

stand,stood, stood

tell,told,told

teach, taught, taught

go,went,gone

hear,heard,heard

Answer:

V1 V2. V3

beat beat. beaten

become. became become

begin began begun

come came come

cost cost cost

cut cut. cut

dig dug dug

do. did. done

draw. drew drawn

drive. drove driven

drink drank. drunk

fall fell. fallen

feel felt. felt

fight. fought. fought

find found. found

fly. flew. flown

forget forgot. forgotten

forgive. forgave. forgiven

freeze. froze. frozen

give gave. given

go went gone

grow. grew. grown

hang hung hung

have had had

hear heard heard

Answer:

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if 76 is divided into four parts proportional to 7,5,3.4 then the smallest part is:

Medium

Solution

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Correct option is A)

Four parts proportional to

7,5,3 and 4

∴ Four part are equal to7x,5x,3x, and 4x.

∴7x+5x+3x+4x=76

∴19x=76

∴x=

19

76

∴x=4

∴7x=4×7=28

∴5x=5×4=20

∴3x=3×4=12

∴4x=4×4=16

∴ For parts are 28,20,12 and 16.

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Draw the resonating structures of aniline.

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Hint:The resonance structures of aniline are drawn by first displacing the lone pair of electrons on the nitrogen to the bond between C and N. This results in formation of a double bond between C and N with N getting a positive charge due to the donation of electrons.

Complete answer:

- Aniline has the chemical formula C6H5NH2 . It is an organic compound that consists of a phenyl group attached to an amine group.

- Aniline is considered to be the simplest aromatic amine.

- Aniline has the odour of a rotten fish.

- Aniline has 5 resonating structures.