conduction
convection
refraction
reflection
Correct answer is D
No explanation has been provided for this answer.
The vacuum in a thermos flask helps to reduce heat transfer by?
convection and radiation
convection and conduction
conduction and radiation
radiation only
Correct answer is B
No explanation has been provided for this answer.
copper, steel, glass
steel, copper, glass
steel, glass, copper
copper, glass, steel
Correct answer is A
No explanation has been provided for this answer.
1466Jkg-1 oC-1
2933Jkg-1 oC-1
4400Jkg-1 oC-1
5866Jkg-1 oC-1
Correct answer is A
22,000 = 1.5 x c x (30 - 20)
c = 1466Jkg-1 oC-1
100oC
80oC
50oC
40oC
Correct answer is C
Heat loss = heat gained
mh x ch x \(\theta\)h = mc x cc x \(\theta\)c
mh x ch x (\(\theta\) - 20) = mc x cc x (20 - 10)
ch = cc ; mc = 3mh
therefore, \(\theta\) = 50oC