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Heat and TheromdynamicsQuestion and Answers: Page 2

Question Number 75203 Answers: 1 Comments: 0

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Derive the expression for the pressure exerted by an ideal gas on the wall of container

$D e r i v e t h e e x p r e s s i o n$ $f o r t h e p r e s s u r e e x e r t e d$ $b y a n i d e a l g a s o n t h e$ $w a l l o f c o n t a i n e r$

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the molar heat capacity of constant pressure of a gas varies with the temperature according to the equation n c_(p=a+bθ−c/θ^(2 _ ) ) where a.b and c are constant how much heat transfered during an isobaric process in which n makes of gas undergo a temperature rise from θ_i to θ_f ? (b)the molar heat capacity of a metal at low temperature varies with the temperature according to the equation c=bθ+(a/h)θ^3 where a and b are constant .how much heat p_(γ ) make is transfered during a process in which the tempereture change from 0.01(h)to 0.02(h)

$t h e m o l a r h e a t c a p a c i t y o f c o n s t a n t$ $p r e s s u r e o f a g a s v a r i e s w i t h t h e$ $t e m p e r a t u r e a c c o r d i n g t o t h e e q u a t i o n$ $n c_{p = a + b θ - c / θ^{2 \underset{}{}}}$ $w h e r e a . b a n d c a r e c o n s t a n t h o w m u c h h e a t t r a n s f e r e d d u r i n g a n i s o b a r i c p r o c e s s i n w h i c h n m a k e s o f g a s u n d e r g o a t e m p e r a t u r e r i s e f r o m θ_{i} t o θ_{f} ?$ $(b) t h e m o l a r h e a t c a p a c i t y o f a m e t a l a t l o w t e m p e r a t u r e v a r i e s w i t h t h e t e m p e r a t u r e a c c o r d i n g t o t h e e q u a t i o n c = b θ + \frac{a}{h} θ^{3} w h e r e a a n d b a r e c o n s t a n t . h o w m u c h h e a t p_{γ} m a k e i s t r a n s f e r e d d u r i n g a p r o c e s s i n w h i c h t h e t e m p e r e t u r e c h a n g e f r o m 0.01 (h) t o 0.02 (h)$

Question Number 58286 Answers: 0 Comments: 1

A small body with temperature θ and absorbtivity τ is placed in a large evaluated capacity whose interior walls are at a temperature θ_w . when θ_w −θ is small, show that the rate of heat transfer by radiation is Q^• = 4θ_w ^3 Aτδ(θ_w −θ).

$A small body with temperature θ and$ $absorbtivity τ is placed in a large$ $evaluated capacity whose interior$ $walls are at a temperature θ_{w} .$ $when θ_{w} - θ is small, show that the$ $rate of heat transfer by radiation is$ $\overset{∙}{Q} = 4 θ_{w}^{3} A τ δ (θ_{w} - θ) .$

Question Number 58216 Answers: 1 Comments: 1

The molar heat capacity of a metal at low temperature varies with the temperature according to the equation C = bθ + (a/H)θ^3 where a, b and H are constant. How much heat per mole is transfered during the process in which the temperature change from 0.01H to 0.02H ?

$The molar heat capacity of a metal at$ $low temperature varies with the$ $temperature according to the equation$ $C = b θ + \frac{a}{H} θ^{3}$ $where a, b and H are constant .$ $How much heat per mole is transfered$ $during the process in which the$ $temperature change from 0 . 01 H$ $to 0 . 02 H ?$

Question Number 58196 Answers: 1 Comments: 0

The molar heat capacity of constant presure of a gas varies with the temperature according to the equation C_p = a + bθ −(C/θ^2 ) where a,b and C are constants. How much heat is transfered during an isobaric process in which n mole of gas undergo a temperature rise from θ_(i ) to θ_f ?

$The molar heat capacity of constant$ $presure of a gas varies with the temperature$ $according to the equation$ $C_{p} = a + b θ - \frac{C}{θ^{2}}$ $where a, b and C are constants .$ $How much heat is transfered during$ $an isobaric process in which n mole$ $of gas undergo a temperature rise$ $from θ_{i} to θ_{f} ?$

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Question Number 52324 Answers: 1 Comments: 2

Two carnot emgines A and B are operated in series. engine A receiepved heat?from a reservoir at 600 K and rejects it to a reservoir at temp T. B receives heat rejected by A and in turn rejects it to reservoir at 100K. Find (η_B /η_A ) η efficiency

$Two carnot emgines A and B are operated in$ $series . engine A receiepved heat ? from$ $a reservoir at 600 K and rejects it to$ $a reservoir at temp T . B receives$ $heat rejected by A and in turn rejects$ $it to reservoir at 100 K .$ $Find \frac{η_{B}}{η_{A}}$ $η efficiency$

Question Number 51148 Answers: 1 Comments: 0

Two hot cubes are at same temperature and both are cooled by forced convetion the cube are made from the same material but one has side of L metre and other one 2L metre. which cube is at quicker rate of cooling

$T w o h o t c u b e s a r e a t s a m e$ $t e m p e r a t u r e a n d$ $b o t h a r e c o o l e d b y f o r c e d$ $c o n v e t i o n t h e c u b e a r e m a d e$ $f r o m t h e s a m e m a t e r i a l$ $b u t o n e h a s s i d e o f L m e t r e$ $a n d o t h e r o n e 2 L m e t r e .$ $w h i c h c u b e i s a t q u i c k e r$ $r a t e o f c o o l i n g$

Question Number 51098 Answers: 1 Comments: 0

Two similar spherical bodies of radius R and 2R are initially are at same temperature.if they are kept to cool under the same condition.show qualitatively which of the two spherical body will cool faster.

$T w o s i m i l a r s p h e r i c a l$ $b o d i e s o f r a d i u s R a n d 2 R$ $a r e i n i t i a l l y a r e a t s a m e$ $t e m p e r a t u r e . i f t h e y a r e$ $k e p t t o c o o l u n d e r t h e s a m e$ $c o n d i t i o n . s h o w q u a l i t a t i v e l y$ $w h i c h o f t h e t w o s p h e r i c a l$ $b o d y w i l l c o o l f a s t e r .$

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∅=0

$\emptyset = 0$

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During random motion, gas molecules do not interact with each other . Hence Potential energy =0 ...... Pls explain why P.E = 0? P.E is stored form of energy,right?

$D u r i n g r a n d o m m o t i o n, g a s m o l e c u l e s$ $d o n o t i n t e r a c t w i t h e a c h o t h e r .$ $H e n c e P o t e n t i a l e n e r g y = 0 . . . . . .$ $P l s e x p l a i n w h y P . E = 0 ?$ $P . E i s s t o r e d f o r m o f e n e r g y, r i g h t ?$

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Question Number 44298 Answers: 1 Comments: 2

α_1 and α_2 are the temperature coefficients of the two resistors R_1 and R_2 at any temperature T_0 0°C.Find the equivalent resistance if both R_1 and R_(2 ) are connected in series combination.Assume that α_1 and α_2 remain same with change in temperature.

$α_{1} a n d α_{2} a r e t h e t e m p e r a t u r e$ $c o e f f i c i e n t s o f t h e t w o r e s i s t o r s$ $R_{1} a n d R_{2} a t a n y t e m p e r a t u r e T_{0}$ $0 ° C . F i n d t h e e q u i v a l e n t r e s i s t a n c e$ $i f b o t h R_{1} a n d R_{2} a r e c o n n e c t e d i n$ $s e r i e s c o m b i n a t i o n . A s s u m e t h a t$ $α_{1} a n d α_{2} r e m a i n s a m e w i t h c h a n g e$ $i n t e m p e r a t u r e .$

Pg 1 Pg 2 Pg 3

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