Equal masses of two liquids of specific heat capacities 840 J . K g - 1 K ∘ - 1 and 1260 J K g - 1 K 0 - 1 And respective temperature 60 ° C and 30 ° C Are mixed. Find the final temperature of the mixture.

As we know. Heat loss=Heat gain ⇒ m 1 S 1 ∆ T 1 = m 2 S 2 ∆ T 2 ∵ m 1 = m 2 ⇒ S 1 ∆ T 1 = S 2 ∆ T 2 ⇒ 840 × 333 - x = 1260 × x - 303 w h e r e x = F i n a l t e m p e r a t u r e o f t h e m i x t u r e ⇒ 333 - x = 1260 840 × x - 303 ⇒ 333 - x = 1 . 5 × x - 303 ⇒ 333 - x = 1 . 5 x - 454 . 5 ⇒ x = 315 o K = 42 o C Final temperature of the mixture= 42 o C .

E M B I B E

Bureau's Higher Secondary Physics Class 11>Chapter 16 - Heat Phenomena>MODEI. QUESTIONS>Q 3

HARD

11th Odisha Board

IMPORTANT

Earn 100

Equal volumes of mercury and glass have the same thermal capacity. The densities of mercury and glass are $13, 600 kg / m^{3}$ and $2500 kg / m^{3}$ Respectively. If the specific heat capacity of mercury is $130 J {kg}^{- 1} {{}^{0}K}^{- 1},$ Calculate the specific heat capacity of glass.

Important Questions on Heat Phenomena

HARD

11th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 11>Chapter 16 - Heat Phenomena>MODEI. QUESTIONS>Q 4

What volume of water has the same thermal capacity as

1 m^{3}

of ice ? [density of ice =

920 k g / m^{3}

]

HARD

11th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 11>Chapter 16 - Heat Phenomena>MODEI. QUESTIONS>Q 5

When a body of mass

2 k g

absorbs

200 c a l

. of heat its temperature rises from

300 ° C

to

400 °

C. Calculate the specific heat capacity, thermal capacity and water equivalent.

HARD

11th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 11>Chapter 16 - Heat Phenomena>MODEI. QUESTIONS>Q 6

How much energy is required to convert

1

litre of water at

288 ° K

into steam ?

MEDIUM

11th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 11>Chapter 16 - Heat Phenomena>MODEI. QUESTIONS>Q 7

Equal masses of two liquids of specific heat capacities

840 J . K g^{- 1} {{}^{\circ}K}^{- 1}

and

1260

J K g^{- 1} {{}^{0}K}^{- 1}

And respective temperature

60 ° C

and

30 ° C

Are mixed. Find the final temperature of the mixture.

MEDIUM

11th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 11>Chapter 16 - Heat Phenomena>MODEI. QUESTIONS>Q 8

Equal amount of ice at

0 ° C

and water at

90 ° C

are mixed. Find the final temperature.

HARD

11th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 11>Chapter 16 - Heat Phenomena>MODEI. QUESTIONS>Q 9

A bimetallic strip is heated through

t ° C

. If

α_{1}

and

α_{2}

be the linear coefficients
of expansion for the two metals, then the strip bends into an arc of radius

R

. The thickness of each strip is

d

. Find the value of

R

:

HARD

11th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 11>Chapter 16 - Heat Phenomena>MODEI. QUESTIONS>Q 10

A pendulum clock, made of brass records time correctly at

20 ° C

. If the temperature is increased by

10 ° C

, how much time the clock loses in a day ? Given

α_{b r a s s} = 19 \times 10^{- 6} {{}^{0}C}^{- 1}

EASY

11th Odisha Board

IMPORTANT

Bureau's Higher Secondary Physics Class 11>Chapter 16 - Heat Phenomena>MODEI. QUESTIONS>Q 11

A lead bullet travelling at 350km/s strikes a target and is brought to rest.What will be the rise in the temperature of the bullet if there is no heat loss to the surrounding.
(Specific heat capacity of Pb is 0.13J/k/kg and melting point of pb=600.5k)