4. [1/3 Points] DETAILS PREVIOUS ANSWERS OSCOLPHYS1 7.P.043.WA. MY NOTES An object with a mass of 42.0 kg is fired with

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4 1 3 Points Details Previous Answers Oscolphys1 7 P 043 Wa My Notes An Object With A Mass Of 42 0 Kg Is Fired With 1 (529.2 KiB) Viewed 28 times

4. [1/3 Points] DETAILS PREVIOUS ANSWERS OSCOLPHYS1 7.P.043.WA. MY NOTES An object with a mass of 42.0 kg is fired with an initial speed of 1.34 × 10² m/s at an angle of 30.0° above the horizontal from a 128 m high cliff (take ground level to be y = 0 m). (a) Determine the initial total mechanical energy (in J) of the system of the projectile and the earth. 4.323e5 J (b) If when the projectile is at its maximum height of y = 315 m, it is traveling 95.0 m/s, determine the amount of work (in J) that has been done on the projectile by air resistance. 3.192e5 Can you obtain an expression for the total energy of the system at the object's maximum height? Can you write an expression for the work done on the object by air resistance as it travels to the top of its trajectory in terms of the total energy and the maximum height and the total energy at the launch site? J (c) What is the speed (in m/s) of the projectile immediately before it hits the ground, if air resistance does one and a half times as much work on the projectile when it is going down as it did when it was going up? -1.231e5 X Can you write an expression for the total work done on the object by air resistance in terms of the work done on the object by air resistance as it travels to the top of the trajectory? Can you write an expression for the total work done on the object by air resistance in terms of the change in kinetic and potential energy of the object as it travels from the launch site to splash-down? m/s Supporting Materials Physical Constants