The clip is from the movie, \"How To Train Your Dragon 2\". Quickly, the movies
ID: 1497407 • Letter: T
Question
The clip is from the movie, "How To Train Your Dragon 2". Quickly, the movies series is about a group of people who view dragons as enemies and through the hard work of the main character become friends with them. Dragons are now pets to them, much like horses. In this clip, the kids in the village fly their dragons around the island in a race. One part of the race is to shoot a sheep in the air with a bow. The rider who catches the sheep receives points which help them win the race/contest. In the clip you will see that the sheep gets launched by a bow and arrow type contraption. Assume the sheep has a mass of 60 kg and also assume that the bow is stretched 1.5 meters when the sheep is loaded into the contraption. Notice that there is a timer on the lower right of the video. Explain how energy is conserved When the sheep moves from the initial launch position until it just leaves the contraption. When the sheep moves from the end of the contraption to its maximum height. How high does the sheet travel after it has been launched? Take a measurement to help determine the answer? Use your answer to #2and the conservation of energy to determine how fast the sheep was traveling when it left the "bow" Determine the amount of energy stored by the bow when the sheep was in its initial position.Explanation / Answer
1 a) The launching bow acts like spring.
The spring potential energy is converted into kinetic energy by which sheep is launched
b) In this process the kinetic energy of the launch get converted into gravitaional potential energy.
When the sheep is at maximum height the whole kinetic energy gets converted into gravitaional potential energy
2. Initial KE after launch = Potential energy at maximum height
0.5kx^2 = 0.5 m v^2 = mgh
h = 0.5k (1.5)^2/(60*9.8) m
value of k is in video
3) v = sqrt (2gh) where g=9.8m/s^3
= sqrt (19.6 h) where h is height found
4) Energy stored = 0.5 k x^2
= 1.125 k J
where k is spring or bow constant given in video
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