A uniform metallic rod rotates about its perpendicular bisector with constant angular speed. If it is heated uniformly to raise its temperature slightly
(a) Its speed of rotation increases
(b) Its speed of rotation decreases
(c) Its speed of rotation remains same
(d) Its speed increases because its moment of inertia increases
A uniform metallic rod rotates about its perpendicular bisector with constant angular speed. If it is heated uniformly to raise its temperature slightly
(a) Its speed of rotation increases
(b) Its speed of rotation decreases
(c) Its speed of rotation remains same
(d) Its speed increases because its moment of inertia increases
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1 Answer
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This is a multiple choice answer as classified in NCERT Exemplar
L = angular momentum = Iw = constant

I1w1=I2w2
Due to expansion of the rod I2>I1
w2
1 so angular velocity decreases.
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According to question, we can write
Heat Released by block = Heat gain by large Ice block
5 × 0.39 × 500 = mice × 335
= 2.91 kg
Given
6a2 = 24
a2 = 4
a = 2m
This is a multiple choice answer as classified in NCERT Exemplar
(b), (c), (d) When the hot milk in the table is transferred to the surroundings by conduction, convection and radiation.
According to newton's law of cooling temperature of the milk falls of exponentially. Heat also will be transferred from surroundings to the milk but will be lesser than that of transferred from milk to surroundings. So option b, c, d satisfy.
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