Calculate the ratio of the drag force on a jet flying at 885 km/h at an altitude of 8.6 km to the drag force on a prop-driven transport flying at half that speed and altitude. The density of air is 0.46 kg/m³ at 8.6 km and 0.71 kg/m³ at 4.3 km. Assume that the airplanes have the same effective cross-sectional area and drag coefficient C.
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- At a post office, a parcel that is an m kg box slides down a ramp inclined at an angle θ with the horizontal, as shown. The coefficient of kinetic friction between the box and the ramp is μK, and the coefficient of static friction for the same is μS. Notice that the coordinate axes have been chosen with the x axis directed up the incline, as shown. Enter a numeric answer for the magnitude of the acceleration in meters per squared seconds when the angle of the incline is 21° and the coefficient of kinetic friction is 0.055. Kinematics may help you here. Using the numbers from the previous step, give a numeric answer for the time in seconds that elapse when the package, initially at rest, travels a distance of 4.5 m down the ramp. Using the numbers from the previous steps, give a numeric answer for the speed of the package at the moment it has traveled a distance of 4.5 m down the ramp.A moving truck (m = 3200 kg) is parked on a hill that is inclined at an angle of 11◦ from the horizontal. Assuming that the static friction between the truck and surface on which it is parked is at its maximum value, what is the coefficient of static friction of the surface?If the coefficient of kinetic friction, , between the block and the surface is 0.30 and the magnitude of the frictional force is 80.0 N, what is the weight of the block? ( Assume the block is on a horizontal surface)
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