16. Running without friction is impossible. In fact, to maximize your acceleration, you to maximize the static friction between your shoes and the floor. a) Explain why friction is necessary for running or walking. requirement, employees' shoes must have a coefficient of static friction of 0.5 or on a specified tile surface. In an emergency, what is the minimum time interval in v a postal worker starting from rest can move a distance of 3 m on the tile surface? b) To meet a U.S. Postal Se
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- 1. You are tasked with designing the runway on an aircraft carrier. The minimum speed for the F/A18 Hornet is 200 mph. The Hornet weighs 40,000 lbf and its twin engines provide a thrust of ~40,000 lbf combined, providing a max acceleration of 1g.a. How long must the deck be to takeoff unassisted? Give the answer in ft. b. This is most likely longer than your typical ~450 ft carrier. What acceleration must you achieve with both the engines and with a catapult system together to reach the required minimum speed by the end of the deck? c. What net force (combined engines and catapult) must be applied to the plane to get the acceleration in b? d. Do you think the plane will be able to use disk brakes on its tires to stop when landing?Use your knowledge of friction to make your argument. Also know that their coefficient of friction is ~1.4. Determine the maximum constant speed at which the 2.2-Mg car can travel over the crest of the hill at A without leaving the surface of the road. Neglect the size of the car in the calculation. y -y = 20 (1 ¬0 000) 100 mWhich of the following descriptions corresponds to a ball tossed vertically upward? Air resistance can be neglected. a. The velocity decreases linearly from v_0 to v_f, with v_0>0 and v_f<0. b. The velocity increases linearly from zero to v_f. c. The position first increases linearly and then decreases linearly as a function of time. d. The acceleration decreases linearly from g to zero.