(d) A bullet is fired horizontally from a high-powered rifle. If air drag is taken into account, is the magnitude of the bullet's acceleration after leaving the barrel greater than or less than g? Explain.
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- A 5.8-kg toboggan is kicked on a frozen pond, such that it acquires a speed of 2.1 m/s to the right. The coefficient of friction between the pond and the toboggan is 0.18. Determine the distance that the toboggan slides before coming to rest. Answer: m (round to the nearest hundredth)A modern race car is designed so that the passing air pushes down on it, allowing the car to travel much faster through a flat turn in a Grand Prix without friction failing. This downward push is called negative lift. Can a race car have so much negative lift that it could be driven upside down on a long ceiling, as done fictionally by a sedan in the first Men in Black movie? a Grand Prix race car of mass m = 600 kg as it travels on a flat track in a circular arc of radius R = 100 m. Because of the shape of the car and the wings on it, the passing air exerts a negative lift downward on the car. The coefficient of static friction between the tires and the track is 0.75. (Assume that the forces on the four tires are identical.) (a) If the car is on the verge of sliding out of the turn when its speed is 28.6 m/s, what is the magnitude of the negative lift acting downward on the car?Consider a 5,000-kg truck moving at a speed of 60 km/h when the driver applies the brakes and the truck skids to a stop after travelling a distance of 50 m. Calculate the coefficient of kinetic friction between the truck’s tires and the pavement.
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