MARK THE STATEMENT AS TRUE OR FALSE When heat is provided to a solid it causes a change in its length 2 The upper fixed point of a thermometer is 100°C. The bottom part of cooking utensils is polished. 4 in summer, telephone wires sag. 5 The heat coming from the sun travels by convection. 6. More is the heating, more is the expansion of solids. 7 Thermal expansion only has bad effects. & We can hold a glass rod for a longer time than a metal rod when both the rods are heated. 9 Iron is a better conductor of heat than copper. 10 Air conducts heat. 11. Solids expand more than liquids and gases. 12 Expansion of different liquids is different. 13. A thick glass tumbler cracks when hot water is poured into it. 14 Mud houses are hot in summer and cold in winter
Answers
Answered by
3
cotθ=
3
1
⇒cotθ=cot60
o
⇒θ=60
o
∴(
2−sin
2
θ
1−cos
2
θ
)
Putting the value of θ we get,
=
2−sin
2
60
o
1−cos
2
60
o
=
2−(
2
3
)
2
1−(
2
1
)
2
=
2−
4
3
1−
4
1
=
4
8−3
4
4−1
=
4
5
4
3
=
5
3
.
Answered by
2
Answer:
we put a positive test charge qo at a point and measure F/qo, then it can be predicted that the electric field strength E. >F/q. =F/q. <F/q.
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