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A: Given Mass m = 56 kg Coefficient of friction = 0.26 Initial velocity v0 = 21 m/s
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- The device pictured in the following figure entertains infants while keeping them from wandering. The child bounces in a harness suspended from a door frame by a spring. (a) If the spring stretches 0.250 m while supporting an 8.0-kg child, what is its force constant? (b) What is the time for one complete bounce of this child? (c) What is the child’s maximum velocity if the amplitude of her bounce is 0.200 m?Check Your Understanding Why would it hurt more if you snapped your hand with a ruler than with a loose spring, even if the displacement of each system is equal?Some people modify cars to be much closer to the ground than when manufactured. Should they install stiffer springs? Explain your answer.
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- h cm A pendulum bob of mass, m, is raised a distance 24 cm above its lowest point. What is the velocity when the swinging mass is at a position 1/7 of the full height above the equilibrium position? Answer to 3 sig figs.0.50m 0.25m B 0.75 m and the point D is 0.25 m higher than. B. A ball-bearing of mess 0.060 kg is released frem A, which is 0.50m higher than B. Assume that rotational and frictional effects can be ignored and that the oali-bearing remains in contac: with the track throughout the motion. (a) Calculate the speed of the ball-hearing (6) at E, (ii) at D. (i) Drawa diagram showing the farces acting on the ball-bearing when it is at D and caiculate the reaction between the track and the bail-bearing at this point.A solid sphere of mass M is on a surface as shown below. It is atteched wall by two springs with the same constant K. Initially the sphere is at rest the springs unstretched. The sphere is pulled a distance A and then released. a) What would the spring constants have to be for this system to have the same w as a system comprised of a single block of mass M and with stiffness K? b) What would the mass of the sphere have to be for this system to have the same w as a system comprised of a single block of mass M and spring with stiffness K?