Astorm blows wind across the top of a roof at a speed of v = 26.3 m/s. assume the air on the lower side of the roof (inside) is at rest and the roof is flat and has an area a = 38.9 m². the density of air is 1.28 kg/m³.1) what is the pressure differential across the top and bottom of the roof? 2) what is the net lift force on the roof due to the storm?

Explain how the energy of rubber ball is tranforned as it roll down a ramp. give evidence that the energy of the og the ball remains the same at all points on the ramp

Aleaky 10-kg bucket is lifted from the ground to a height of 15 m at a constant speed with a rope that weighs 0.7 kg/m. initially the bucket contains 45 kg of water, but the water leaks at a constant rate and finishes draining just as the bucket reaches the 15-m level. find the work done. (use 9.8 m/s2 for g.) show how to approximate the required work by a riemann sum. (let x be the height in meters above the ground. enter xi* as xi.) lim n → ∞ n (9.8)(45−3 xi) i = 1 δx express the work as an integral. 0 dx evaluate the integral. (round your answer to the nearest integer.) j

Why should the wavelength scale of spectroscope be calibrated