3.2\(\Omega\)
1.4\(\Omega\)
3.21\(\Omega\)
1.2\(\Omega\)
Correct answer is D
\(\frac{R}{3.6} = \frac{75}{25} = \frac{1}{3}\)
3R = 3.6
R = 1.2\(\Omega\)
all the heat is used to break the bonds holding the molecules of the solid together
the heat capacity has become very large as the substance melts
the heat energy is quickly conducted away
the heat gained is equal to the heat lost by the substance
Correct answer is A
During the transformation of the matter from the solid to the liquid state, the heat supplied does not produce a temperature increase because all the heat is used to break the bonds holding the molecules of the solid together
Lamps in domestic lightings are usually in
series
divergent
convergent
parallel
Correct answer is D
Lamps in lightenings are arranged to reduce the heat losses
- resultant resistance is small for parallel arrangement which indicate low heat losses [Heat \(\alpha\) R]
10m/s
6m/s
8m/s
4m/s
Correct answer is D
V = u _ at, at u = 44m/s
44 + [-4]10
4m/s
The value of T in the figure above is
30N
10.0N
20N
40N
Correct answer is D
Tsin30 + Tsin30 =40
2Tsin30 = 40
Tsin30 = 40/2 = 20
T(\(\frac{1}{2}\)) = 20
T = 20 x 2 = 40N
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