Flag Thermal Physics> thermodynamics...
question mark

A thermally insulated closed copper vessel contains water at 15°C, when the vessel is shaken vigorously for 15 minutes temperature rises to 17°C. The mass of the vessel is 100g and that of water is 200g. Neglect any thermal expansion. How much heat is transferred to the liquid vessel system? How much work has been done on this system? How much is the increase in the internal energy of the system? The specific heat of water is 4200 J/kg-K and for copper is 420 J/kg-K

Pranjal K , 11 Years ago
Grade upto college level
anser 1 Answers
Nirmal Singh.

Last Activity: 11 Years ago

T1 = 15 degree C , T2 = 17 degree C, m1 (Vessel) = 100g = 100x100 -2 Kg, m2 = 200g = 200x100 -2 Kg, , Specific heat of copper = s1 = 420 j/kg-K, specific heat of water s2 =4200 j/kg-K
(a) The heat transferred to the liquid vessel system is 0. The internal heat is shared in between the
vessel and water.
(b) Work done on the system = Heat produced
dw = m1 s1 (T2-T1) + m2 s2(T2 - T1)
dw = 100 × 10–3 × 420 × 2 + 200 × 10–3 × 4200 × 2 = 84 + 84 × 20 = 84 × 21 = 1764 J.
(c) dQ = 0, dU = – dw = 1764. [since dw = –ve work done on the system]
Thanks & Regards,
Nirmal Singh
Askiitians faculty

Provide a better Answer & Earn Cool Goodies

star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Ask a Doubt

Get your questions answered by the expert for free