18. What role does specific heat play in keeping a watermelon cool for a long time after to
it from a fridge on a hot day? (AST)
16, Ifyou are chillyoutside the shower stall
, why doyou feel warm after the bath if youstayin the bathroom
7. Three objects, A at 30°C, B at 303K and C at 420K are in thermal contact. Then ang
follwing questions.
(i) Which aare in “Thermal equibrium” among A,B and C.
(ii) From which object to another heat transferred
Fill in the blanks
The SI unit of specific heat is
flows from a body at higher temperature to a body at lower tempe
is a cooling process.
n object ‘A’at 10°C and another object 'B'at 10K are kept in contact, then heat
om
to
e latent heat of fusion of ice is
Answers
Explanation:
18. Higher the specific heat capacity of a body,the more heat is required to raise the temperature of a body. So accordingly, Water has a very high specific heat capacity. Water melon has a lot of water in it. Due to the presence of water in a water melon, it has high specific heat capacity and therefore thus does not heat up easily. It stays cool.
16.We feel warm after we finish our bath in the bathroom , because in the bathroom , the number of vapour molecules per unit volume is greater than the number of vapour molecules per unit volume outside bathroom.
7.Given,particles A, B and C square measure projected from an equivalent purpose with same initial speeds creating angles 30°, 45° and 60°
RA = (u^2 sin 60/g = v3/2 u^2/g =
RB = (U12 sin 90°/g = u^2/g
52
4.0
Rc = (u^2 sin 120/g = V3/2 u^2/g
Ranges A and C square measure equal however but that of B.
JOULE
Because, body at higher temperature has higher average KE of molecules and body at lower temperature has lower average KE of molecules. When two bodies having higher temperature and lower temperature are keep in contact, the body at higher temperature shares their energy to molecules at lower temperature.
heat will flow from A to B as the temperature in Celcius is more as compared to Kelvin.