2) Suppose a projectile of mass 7 kg is fired on a hillside with initial speed 10. The hill slopes continuously upward a

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2 Suppose A Projectile Of Mass 7 Kg Is Fired On A Hillside With Initial Speed 10 The Hill Slopes Continuously Upward A 1 (65.56 KiB) Viewed 44 times

2) Suppose a projectile of mass 7 kg is fired on a hillside with initial speed 10. The hill slopes continuously upward at +30° from horizontal, and the angle at which the projectile is fired is 45° above horizontal. Find : a) The kinetic energy of the projectile at the moment is is shot. Strictly "plug-n-chug," the form for kinetic energy is K = mu? (Answers for all versions are below in a table.) b) The magnitude of the momentum of the projectile at the moment it is shot. Similarly, this is a direct application of a realatively simple formula: 1P1 = mv c) The gravitational potential energy compared to the release point) of the projectile at its highest point. You could do this by calculating the height to which the projectile rises and plug- ging into U. = mgAh. There's another way invoking the concept of conservation of energy. Either will give the right answer. grau d) The distance, measured along the hill, from the starting point to where it lands. This was of course possible to derive, but hopefully you had on your formula sheet the generic answer I derived for this situation. (In the presentation on Day 20% cosa 08 in case you wanted to look back at it.) It was: d {tan 0- tann where 0 is the projectile firing angle above horizontal, and n is the angle for the hill's slope. 9 COST