1. A 100 W lightbulb generates 95 W of heat, which is dissipated through a glass bulb that has a radius of 2.6 cm and is 0.80 mm thick.
What is the difference in temperature between the inner and outer surfaces of the glass?
T=?
2. A helium-filled balloon escapes a child's hand at sea level and 21.5 ∘C .
When it reaches an altitude of 3000 m, where the temperature is 4.6 ∘C and the pressure is only 0.68 atm, how will its volume compare to that at sea level?
Express your answer using two significant figures.
V2/V1=______
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