Concept explainers
* Super Hornet jet takeoff
Super Hornet jet airplane (see Figure P3.29) goes from zero to
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- Why does a sprinter keep running even after crossing the finishing line? A) He wants to make sure that he crosses the line B) Inertia of rest takes some time to make him stop C) Inertia of motion keeps him moving D) Friction between his shoes and the ground causes him to move beyond the linearrow_forwardA 4.35 kg cat moves in a straight line (the x-axis). The image shows a graph of the x-component of this cat's velocity as a function of time. a. What is the maximum net force on this cat, and when does this maximum net force occur? b. When is the net force on the cat equal to zero? c. What is the net force at time 8.5 s?arrow_forwardon an unknown planet, a 145 g baseball is hit so that it travels straight upward to reach a maximum height of 15.6 m after being struck by the bat. A fan observes that it takes 2.90 s for the ball to reach its maximum height. A. what is the initial velocity of the baseball B. What is the acceleration due to gravity on this planetarrow_forward
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- The physics of circular motion sets an upper limit to the speed of human walking. (If you need to go faster, your gait changes from a walk to a run.) If you take a few steps and watch what's happening, you'll see that your body pivots in circular motion over your forward foot as you bring your rear foot forward for the next step. As you do so, the normal force of the ground on your foot decreases and your body tries to "lift off" from the ground. A. A person's center of mass is very near the hips, at the top of the legs. Model a person as a particle of mass m at the top of a leg of length L. Find an expression for the person's maximum walking speed vmax Express your answer in terms of the variables L and appropriate constants. b.)Evaluate your expression for the maximum walking speed of a 70 kg person with a typical leg length of 70 cm . Give your answer in m/s. c.) Give your answer in mph.arrow_forward2D Kinematics: A rocket is fired vertically upward with an initial velocity of 80 m/s. It acceleratesupward at 4 m/s2 until it reaches an altitude of 1000 m when its engines fail and it enters free fall.(a) How long is the rocket in motion? (b) What is its maximum altitude and what is its velocityjust before it crashes back into the earth? Newton's Law: A block remains stationary on an inclined plane of 30 degrees(a) Draw a free body diagram.(b) Find the minimum coefficient of static friction between the block and incline.arrow_forwardThe trap-jaw ant, found throughout tropical South America, catches its prey by very rapidly closing its mandibles around its victim. Shown is the speed of one of its mandible jaws versus time in microseconds. a. What is the maximum acceleration of the ant’s mandible? b. The mass of a trap-jaw ant’s mandible has been estimated to be about 1.3 x 10-7 kg. Estimate the maximum force exerted by one mandible.arrow_forward
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