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Chapter 6: Q80P (page 147)
Calculate the magnitude of the drag force on a missile 53 cmin diameter cruising at 250 m/sat low altitude, where the density of air is. Assume.
The magnitude of the drag force is .
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A student, crazed by final exams, uses a force of magnitude 80Nand angleto push a 5.0 kg block across the ceiling of his room (Fig. 6-52). If the coefficient of kinetic friction between the block and the ceiling is 0.40, what is the magnitude of the block鈥檚 acceleration?
Figure 6-16 shows the overhead view of the path of an amusement-park ride that travels at constant speed through five circular arcs of radii,,and. Rank the arcs according to the magnitude of the centripetal force on a rider traveling in the arcs, greatest first.
A ski that is placed on snow will stick to the snow. However, when the ski is moved along the snow, the rubbing warms and partially melts the snow, reducing the coefficient of kinetic friction and promoting sliding. Waxing the ski makes it water repellent and reduces friction with the resulting layer of water. A magazine reports that a new type of plastic ski is especially water repellent and that, on a gentle 200 mslope in the Alps, a skier reduced his top-to-bottom time from 61 swith standard skis to 42 swith the new skis. Determine the magnitude of his average acceleration with (a) the standard skis and (b) the new skis. Assuming a slope, compute the coefficient of kinetic friction for (c) the standard skis and (d) the new skis.
In Fig. 6-27, a box of Cheerios and a box of Wheatiesare accelerated across a horizontal surface by a horizontal force applied to the Cheerios box. The magnitude of the frictional force on the Cheerios box is , and the magnitude of the frictional force on the Wheaties box is . If the magnitude of is , what is the magnitude of the force on the Wheaties box from the Cheerios box?
A horizontal force pushes a block weighing against a vertical wall (Fig. 6-26). The coefficient of static friction between the wall and the block is , and the coefficient of kinetic friction is . Assume that the block is not moving initially. (a) Will the block move? (b) In unit-vector notation, what is the force on the block from the wall?
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