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Q:If a force F acts on an object such that its lever arm is zero, does it have any effect on the object’s motion? Explain.Q:Why is it more difficult to do a sit-up with your hands behind your head than when you arms are stretched out in front of you? A diagram may help youQ:A 21-speed bicycle has seven sprockets at the rear wheel and three at the pedal cranks. In which gear is it harder to pedal, a small rear sprocket orQ:Mammals that depend on being able to run fast have slender lower legs with flesh and muscle concentrated high, close to the body (Fig. 8-34) On theQ:Why do tightrope walkers (Fig 8-35) carry a long, narrow beam?Q:If the net force on a system is zero, is the net torque also zero? If the net torque on a system is zero, is the net force zero?Q:Two inclines have the same height but make different angles with the horizontal. The same steel ball is rolled down each incline will the speed ofQ:Two solid spheres simultaneously start rolling (from rest) down and incline. One sphere has twice the radius and twice the mass of the other. WhichQ:A sphere and a cylinder have the same radius and the same mass. They start from rest at the top of an incline. Which reaches the bottom first? WhichQ:We claim that momentum and angular momentum are conserved. Yet most moving or rotating objects eventually slow down and stop. Explain
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