che thermodynamics 1 reviewer

7/21/2019 ChE Thermodynamics 1 Reviewer

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ChE Thermodynamics 1

QUIZ 1


2/33

PROBLEM 1

An astronaut weighs 730 Nin Houston, Texas where the

local acceleration of gravityis 9.792 ms2. !hat are theastronaut"s mass # weighton the moon, where g $%.&7 ms2'


3/33

PROBLEM 1: ANSWER

m $ 7(.))

*g+ $ %2(.) N


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PROBLEM 2

+ive masses in a region wherethe accelertion ue to gravityis 30.) fts2 are as follows- m%is

)00 g of mass m2weighs /00

gf, m3weighs %) ounals m(

weighs 3 l1f, m)is 0.%0 slug ofmass. !hat is the total mass

exresse in a grams 1


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PROBLEM 2: ANSWER

a mt$

((&(.)( g

1 9./3( l1c 0.30)) slug


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PROBLEM 3

The mass of a given airlane atsea level g $ 32.% fs2 is %0tons. +in its mass in l1, slugs# *g an its weight in l1 whenit is travelling at a )0,0004ft

elevation. The acceleration ofgravity ecreases 1y 3.33 %04&

fs2for each foot 1y

elevation.


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PROBLEM 3: ANSWER

m l1 $ 20000 l1

m slug $&2%.&2 slugm *g $ (0/0 *g

+ $ %9/(/ 32 l1f


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PROBLEM 4

The mass of a 5uisystem is 0.3%% slug,

its ensity is 30 l1ft3#g is 3%.9/ fs2. +in a

the seci6c volume 1seci6c weight # c


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PROBLEM 4: ANSWER

a 0.0333

ft3l11 29.7(

l1fft3


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PROBLEM 5

Two liuis of i8erentensities %$ %)00 *gm

3, 2

$ )00 *gm3 are ouretogether into a %004 tan*,6lling it. :f the resulting ensity

of the mixture is /00 *gm3

.+in the resective uantitiesof liuis use. Also, 6n the

weight of the mixture *gf g


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PROBLEM 5: ANSWER

m%$ () *g

m2$ 3) *g

+ $ 79 *gf


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PROBLEM 6

;iven the 1arometric ressure of%(.7 si, ma*e these conversions-

a/0 sig to sia # to atm g

1%0 sia to sivac # to siac%0 sia to sivac # to


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PROBLEM 6: ANSWERa


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PROBLEM 7

A ea4weight gauge with a %4cm4iameter iston is use tomeasure ressures very

accurately. :n a articular instancea mass of &.%( *g incluing iston# an 1rings it into 1alance. :f the

local acceleration of gravity is 9./2ms, what is the gauge ressure1eing measure' :f the 1arometric

ressure is 7(/ torr, what is the


15/33

PROBLEM 7: ANSWER


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PROBLEM 8

=erive the

relation

1etween+arenheit #


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PROBLEM 8: ANSWER

o> $ )9o+ ?

32o

+ $ 9)o

> @ 32


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PROBLEM 9

how that the

seci6c heat of asu1stance in

BTCl1o+ isnumerically eual


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PROBLEM 9: ANSWER

%

calgo>


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PROBLEM 10

An instrument to measure theacceleration of gravity on Dars isconstructe of a sring from which

is susene a mass of 0.(0 *g. Ata lace on earth where the sringextens %.0/ cm. !hen the

instrument ac*age is lane onDars, it raios the information thatthe sring is extene 0.(0 cm.

!hat is the marsian acceleration


21/33

PROBLEM 10: ANSWER

g2$ 3.&3

ms2


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PROBLEM 11

The variation of 5ui ressure withheight is escri1e 1y the i8erentialeuation-


23/33

PROBLEM 11: ANSWER


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PROBLEM 12

A gas con6ne in a %.2) ft4iameter cyliner 1y aiston an weight together is 2)0 l1m. The localacceleration of gravity is 32.%&9 fts2an atmoshericressure is 30.%2 inHg.

a !hat is the force in l1f exterte on the gas 1y the

atmoshere, the iston an the weight, assuming nofriction 1etween the iston an cyliner'

1 !hat is the ressure of the gas in sia'

c :f the gas in the cyliner is heate, it exans,

ushing the iston an weight uwar. :f the istonan weight are raise %.7 ft, what is the wor* one1y the gas in ft l1f' !hat is the change in otentialenergy of the iston an weight'


25/33

PROBLEM 12: ANSWER

+T$ 2/&).03 l1f


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PROBLEM 13

A 5ui moves in a steay5ow manner 1etween two

sections in a 5ow line. Atsection %, A%$ %0 ft

2, G%$

%00 fm, %$ ( ft3

l1. Atsection 2, A2$ 2 ft

2, 2$

0.20 l1ft3

.


27/33

PROBLEM 13: ANSWER

m%$ m2$ 2)0

l1minv2 $ &2) ftmin


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PROBLEM 16

:f a um ischarges 7)gallons er minute of water

whose seci6c weight is&%.9) l1fft g $ 3%.9) fts2,6n a mass 5oware in

l1min 1 the total timereuire to 6ll a vertical

cyliner tan* %0 ft in


29/33

PROBLEM 16: ANSWER

m $ &2).3/

l1min

t $ 9(.0% min


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PROBLEM 17

Two gaseous streams enter a com1iningtu1e # leave as a single mixture. These ataaly at the entrance section.

+or one gas, A%$ 7) m2, %$ %0 ft

3l1, v%$

)00 fts+or the other gas, A2$ )0 in

2, 2$ 0.%2

l1ft3, m2$ %&.&7 l1s

At exit, v3$ 3)0 fts, 3$ 7 ft3l1+in a the see of section 2 # 1 the 5owan area at the exit section.


31/33

PROBLEM 17: ANSWER

av2$ (00.0/ fts

1m

3$ (2.7% l1s

A3$ 0./)(2 ft2


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PROBLEM 18

A %0 ft iameter 1y %) ftheight vertical tan* is receivingwater &2.% l1ft3 at the rate of

300 gm # is ischargingthrough a & insie iameter

line with a constant see of )fts. At a green instant the tan*is half full. +in the water level

# the mass change in the tan*


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PROBLEM 18: ANSWER

h $ 3.9% ftmass change $

%7)%).2 l1

che thermodynamics 1 reviewer

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