1. King Kong falls from the top of the Empire State Building,through the air (ai
ID: 1733809 • Letter: 1
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1. King Kong falls from the top of the Empire State Building,through the air (aire friction is present), to the ground below.How does his kinetic energy (K) just before striking the groundcompare to his potential energy (U) at the top of thebuilding? a.) K is equal to U b.) K is greater than U c.) K is less than U d.) It is impossible to tell 2. Consides two mass m1 and m2 at the top of two frictionlessinclined planes. Both masses start from rest at the same height.However, the plane of which m1 sits is at an angle of 30 degreeswith the horizontal, while the plane of which m2 sits is at 60degrees. If the masses are released, which is going faster at thebottom of its plane? a.) m1 b.) m2 c.) they both are going the same speed d.) cannot be determined without knowing the masses Any help is appreciated. 1. King Kong falls from the top of the Empire State Building,through the air (aire friction is present), to the ground below.How does his kinetic energy (K) just before striking the groundcompare to his potential energy (U) at the top of thebuilding? a.) K is equal to U b.) K is greater than U c.) K is less than U d.) It is impossible to tell 2. Consides two mass m1 and m2 at the top of two frictionlessinclined planes. Both masses start from rest at the same height.However, the plane of which m1 sits is at an angle of 30 degreeswith the horizontal, while the plane of which m2 sits is at 60degrees. If the masses are released, which is going faster at thebottom of its plane? a.) m1 b.) m2 c.) they both are going the same speed d.) cannot be determined without knowing the masses Any help is appreciated.Explanation / Answer
1) since conservation of energy would add frictional heat tothe final kinetic energy and the sum of kinetic and frictionalenergy is supposed to equal the potential energy, the kineticenergy is less than the original potential. the answer is c: k is less than u 2) There are two different ways to find the answer tothis question. The first way would to use your triginometryto find the parallel force and the distance. You would findthat the angles cancel each other out and you are left with theheight. The second way is just to know that the potentialenergy is height times weight. So if there are no otherforces like friction the two masses should have the exact samespeed when they reach ground level. the answer is c: they are going the same speed.Related Questions
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