Question

37. A clock pendulum made of brass has a period of 0.500 s and is accurate at 20°C. If the clock is used in a climate where the temperature averages 30°C, what correction (approximately) is necessary at the end of 30 days to the time given by the clock? The coefficient of linear expansion for brass is α = 19 X 10-6/°C. Ans. 4.11 min

36 In a hurricane, the air (density 1.2 kg/m³) is blowing over the roof of a house at a speed of 45.0 m/s. (a) What is the pressure difference inside and outside that tends to lift the roof? (b) What would be the lifting force on a roof of area 70 m²? Ans. 1215 Pa F = 8.51 x 10^4 N

Still I can not understand well. Please I need explanation in words. Show me your work. Thanks.

Answer 1