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Each of the three helicopter rotor blades shown in Fig. 10-67 is5.20 m long and has a mass of 297 kg. The rotor is rotating at 215rev/min. (a) What is the rotational inertia of therotor assembly about the axis of rotation? (Each blade can beconsidered to be a thin rod rotated about one end.)(b) What is the total kinetic energy of rotation?
A playground is on the flat roof of a city school, 6.1 m above the street below (see figure). The vertical wall of the building is h = 7.60 m high, forming a 1.5-m-high railing around the playground. A ball has fallen to the street below, and a pa..
A 13 g bullet traveling 230 m/s penetrates a 2.0 kg block of wood and emerges going 170 m/s. how fast does it move after the bullet emerges
Estimate the heat flow when a double pane of glass is used with a 4.0 mm air gap between the panes? Each individual glass sheet is 4.0 mm thick
A 250. MW coal-fired power plant burns fuel with an energy density of 35.0 MJ kg-1. Water enters the temp reduction towerat 293 K and leaves at 350. K at a rate of 4200. kgs-1.
A submarine is 304 m horizontally out from the shore and 126 m beneath the surface of the water. A laser beam is sent from the sub so that it strikes the surface of the water at a point 232 m from the shore. If beam just strikes the top of a building..
You measure the length of a distant car to be subtended by an angular distance of 1.0 degrees. approximately how far away is the car
A refracting telescope has an objective and an eyepiece that have refractive powers of 1.25 diopters and 300 diopters, respectively. Find the angular magnification of the telescope
An object 0.680cm tall is placed 18.5cm to the left of the vertex of a convex spherical mirror having a radius of curvature of 25.0cm. Calculate the position of the image
Water is pumped steadily out of a flooded basement at a speedof 5.0 m/s through a uniform hose of radius 1.0 cm. What is the power of the pump
A baseball m = 0.56 kg is spun vertically on a massless string L = 0.94 m. The string can only support a tension of T = 9.4 N before it will break. What is the maximum speed at the top of the loop in m/s
A 145-g ball was thrown into the air at an initial velocity of16 m/s. (Assume the ball started at ground level.) The ball reacheda maximum height of 13 m. What was the kinetic evergy when the ball reached maximumheight (before it started traveling do..
A wheel has 8 evenly spaced spokes. What is the angle between the spokes expressed in radians
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