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course_planning:183_projects:s20_project_7 [2020/02/15 05:08] – pwirving | course_planning:183_projects:s20_project_7 [2020/02/20 18:40] (current) – mherzog | ||
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- | ===== Scenario | + | ===== Scenario |
There is a train speeding down a track with a constant velocity of 20.9 m/s, which appears to have malfunctioning breaks. Captain America gets in front of the train and slows the train to a stop before the train runs over the cliff. Consider this situation from the time Captain America starts slowing the train down until the train comes to a stop. | There is a train speeding down a track with a constant velocity of 20.9 m/s, which appears to have malfunctioning breaks. Captain America gets in front of the train and slows the train to a stop before the train runs over the cliff. Consider this situation from the time Captain America starts slowing the train down until the train comes to a stop. | ||
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1. For each choice of system above, answer the following questions: | 1. For each choice of system above, answer the following questions: | ||
- | * Is energy conserved in the system? Why/why not? | + | |
- | * Is work done on the system? Is it positive or negative? How do you know? | + | * Is energy conserved in the system? Why/why not? |
- | * Draw the energy bar charts for the scenario. | + | * Is work done on the system? Is it positive or negative? How do you know? |
+ | * Draw the energy bar charts for the scenario. | ||
2. Pick a system to calculate how much work Captain America must do to slow the train | 2. Pick a system to calculate how much work Captain America must do to slow the train | ||
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3. Which system did you choose for your analysis? Why? | 3. Which system did you choose for your analysis? Why? | ||
- | */ | ||
- | /* | ||
- | ===== Scenario | + | ===== Scenario |
Iron Man encounters a train that has run out of fuel 1000 m before the train station. He decides to put on his blasters (which have a force of 2000 N), and he pushes the train for 500 m to get it up to speed. He's hoping that friction for the rest of the way will slow down the train by the time it arrives at the station. | Iron Man encounters a train that has run out of fuel 1000 m before the train station. He decides to put on his blasters (which have a force of 2000 N), and he pushes the train for 500 m to get it up to speed. He's hoping that friction for the rest of the way will slow down the train by the time it arrives at the station. | ||
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3. Which system did you choose for your analysis? Why? | 3. Which system did you choose for your analysis? Why? | ||
- | */ | ||
- | /* | + | |
- | ===== Scenario | + | |
+ | |||
+ | ===== Scenario | ||
Hawkeye is standing the edge of a tall building (80 m) and needs to fire an arrow into the sky as a warning to the other avengers. He releases the arrow with an initial speed of 50 m/s at an angle of 60 degrees. Consider this situation from the instant after the arrow is launched. | Hawkeye is standing the edge of a tall building (80 m) and needs to fire an arrow into the sky as a warning to the other avengers. He releases the arrow with an initial speed of 50 m/s at an angle of 60 degrees. Consider this situation from the instant after the arrow is launched. | ||
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1. For each choice of system above, answer the following questions: | 1. For each choice of system above, answer the following questions: | ||
- | * Is energy conserved in the system? Why/why not? | + | |
- | * Is work done on the system? Is it positive or negative? How do you know? | + | * Is energy conserved in the system? Why/why not? |
- | * Draw the energy bar charts for the scenario. | + | * Is work done on the system? Is it positive or negative? How do you know? |
+ | * Draw the energy bar charts for the scenario. | ||
2. Pick a system to calculate the maximum height that the arrow will reach in the sky. | 2. Pick a system to calculate the maximum height that the arrow will reach in the sky. | ||
3. Which system did you choose for your analysis? Why? | 3. Which system did you choose for your analysis? Why? | ||
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+ | ===== Scenario 7d: Spiderman drops an apple ===== | ||
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+ | Spiderman is chilling on top of a skyscraper (120 m) eating his lunch, when he accidentally drops his apple. The apple then plummets toward an unsuspecting people on the street below. | ||
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+ | Choice 1: System = Apple | ||
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+ | Choice 2: System = Apple + Earth | ||
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+ | 1. For each choice of system above, answer the following questions: | ||
+ | |||
+ | * Is energy conserved in the system? Why/why not? | ||
+ | * Is work done on the system? Is it positive or negative? How do you know? | ||
+ | * Draw the energy bar charts for the scenario. | ||
+ | |||
+ | 2. Spiderman decides to shoot a web to try to catch the apple before it hits a person on | ||
+ | the street. Pick a system to calculate how much work Spiderman must do to stop the | ||
+ | apple before it hits someone. | ||
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+ | 3. Which system did you choose for your analysis? Why? | ||
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+ | ===== Scenario 7e: Captain Marvel lowers the Infinity Gauntlet ===== | ||
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+ | In the midst of the battle with Thanos, Captain Marvel obtains the very precious infinity gauntlet (m = 2 kg). When she finds it, she raises the gauntlet above her head in victory but then realizes that may be a poor idea considering all the bad guys around. She then lowers the gauntlet again. Consider this time period, when Captain Marvel raises then lowers the infinity gauntlet. | ||
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+ | Choice 1: System = Infinity Gauntlet | ||
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+ | Choice 2: System = Infinity Gauntlet + Earth | ||
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+ | 1. For each choice of system above, answer the following questions: | ||
+ | |||
+ | * Is energy conserved in the system? Why/why not? | ||
+ | * Is work done on the system? Is it positive or negative? How do you know? | ||
+ | * Draw the energy bar charts for the scenario. | ||
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+ | 2. When Captain Marvel lowers the infinity gauntlet, how much work does she do? | ||
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+ | 3. Which system did you choose for your analysis? Why? | ||
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+ | ====== Project 7f: Breakneck -- The new roller-coaster at Michigan' | ||
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+ | {{183_projects: | ||
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+ | You are a team of engineers and scientists who are in the process of designing Michigan' | ||
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+ | Then at the end of the straightaway, | ||
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+ | Your tasks are (a) to decide on an appropriate braking force and length of the braking region needed on the straightaway to stop the car at the right location, and (b) the effective spring constant of the turnaround device. | ||
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+ | {{183_projects: | ||
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+ | ====== Project 7g: Hulk Trap ====== | ||
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+ | Black Widow unfortunately finds the Hulk trapped in a net by the ceiling, which is tied to an anchor on the floor. Black Widow wants to rescue the Hulk but doesn' | ||
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