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--- course_planning:183_projects:s20_week_10_problems [2020/07/30 02:26] – created pwirving
+++ course_planning:183_projects:s20_week_10_problems [2021/03/23 03:42] (current) – pwirving
@@ Line 1: / Line 1: @@
-====== Project 10: Saving a probe ======
+====== Project 10: Part A: Launching a communications probe ======
+<WRAP info>
-{{ 183_projects:hal_asteroid.png }}
-You need to recover HAL. HAL, if you remember, was a part of the satellite ( $m_{\rm t}=4500\,{\rm kg}$ ) that the Carver Media Group Network (CMGN) launched. The satellite (and HAL) was designed to communicate with Earth out to a distance of 3.8 million kilometers. As part of the electronics HAL contains a green and a red light-emitting diode (LED) mounted on the outer surface of the satellite. One of the probes ( $m_{\rm p}=400\,{\rm kg}$ ) remains attached to a single, very stiff spring ( $k_{\rm p}=5.3\times10^{9}{\rm N/m}$ ) that can be compressed remotely and then released to fire off the probe. You have hacked into this remote firing mechanism.
-Unfortunately, a transcription error was made by Mr. Stamper, Carver's chief "engineer" when the satellite was initially launched. As a result, the satellite escaped Earth's gravity and is currently traveling in a straight line away from the Earth at a distance of 1.9 million kilometers. Its speed is nearly constant at  $340\,{\rm m/s}$ . The gyroscope system that keeps the orientation of the satellite constant is still working.  However, an asteroid ( $m_{\rm a}=9300\,{\rm kg}$ ) traveling at a speed of  $950\,{\rm m/s}$  is on a direct collision course (in line with the Earth and HAL) and the collision is imminent. The asteroid is presently 500 kilometers from the satellite.
-Your team can recapture the satellite if it can be returned to Earth. You should design a way to return the satellite to Earth. You will also need to ensure the asteroid will not collide with the satellite - damaging the probe is ok. Your team also needs to determine the minimum amount of time until the possible collision to determine if a communication from Earth can be completed in time.
-====== Project 10: Post Apocalypse Now ======
 ==== Project 10A: Learning issues ====
-  * Energy Conservation
+  * Gravitational potential energy
-  * Thermal Energy
+  * Spring potential energy
-  * Specific Heat Capacity
+  * Energy conservation
-  * Thermal Equilibrium
+  * Momentum conservation
 </WRAP>
+You and your team are engineers that have been contracted by Elliot Carver of the Carver Media Group Network (CMGN) to plan the launch of their new "communications" satellite. The satellite is meant to perform a geosynchronous pole-to-pole orbit.
+The sattelite consists of a transmitter of mass ( $m_t$  = 4500kg) connected to two perpendicularly directed ejectable spring loaded probes (each having mass  $m_p$  = 400kg). Each probe is connected to a single, very stiff spring ( $k_p$  =  $5.3\times10^9$  N/m). The probes can be ejected by remote control from the CMGN headquarters in Freer, Texas; springs can be compressed as needed. A mockup from CMGN's lead designer, Wai Lin, appears below.
-{{ 183_projects:apoc2.jpg??800 }}
+{{ 183_projects:probe_launch.png?500 }}
-As the satellite, you attempted to save came back into the Earth's atmosphere a remote communication device on the satellite was activated and launched many nuclear missiles across the world scorching most of the Earth.
-//100 years later...//
-You are a member of the Scorched Earth Army, an elite team of survivors responsible for the protection of and collection of resources for Quadrant 4.
-Captain Benjamin L. Willard, Lieutenant Colonel Bill Kilgore, and your team have emerged from your underground bunker to find a deserted wasteland. Well, it's nearly deserted....
+CMGN is //going green// with their satellite launches. Their new design uses no fossil fuels.  The satellite itself is launched from CMGN's launch facility in the South Pole with yet another spring system, oriented vertically with respect to the flat launching platform. This very stiff spring ( $k_L$  = $8.3\times10^8$ N/m) can be compressed as needed.
-Your team is attacked by [[183_notes:supplemental|wild boar-tigers]]. While fighting them off, you manage to slay one of them and collect it for sustenance. Your team returns to the entrance of the bunker only to find it is locked and no one is answering the door.
+The satellite contains a gyroscope that self-orients the satellite with respect to the gravitational force due to the Earth, such that the satellite remains in its original orientation throughout the entirety of its trip.
-Your team takes refuge near a fantastic oil fire. It's getting cold and you are hungry. Willard suggests you cook the beast using an age old technique: boiling water in a dirt pit. You'd like to avoid the carcinogens associated with cooking the beast directly over the oil fire. Your team finds a pile of hard and soft rocks near the oil fire.  The temperature of the oil fire is 2000K. To properly cook the beast, you need to achieve a cooking temperature of 370K. Design the pit.
+Carver needs you to plan the launch and any subsequent course corrections needed to get the satellite into a geosynchronous pole-to-pole orbit.
+====== Project 10b: Joe and Blobs ======
-^                                                 ^ Hard rock ^ Soft rock ^
+You live on the planet Joe. Joe has a radius of 8432 Km and a mass of 6.822 × 10^26 kg. The industrial revolution on Joe has transpired differently than on Earth due to mainly the ability to construct springs of extremely large spring constants. The space program of the planet Bob is reliant on springs to send objects into orbit and for propulsion. However, the scientific community has recently moved to experiment with new forms of energy such as nuclear power. One of these experiments has been the sending of a nuclear-powered satellite (mass of 6900 kg) into orbit above Joe at a distance of 22,600 Km. However, issues have arisen with the coolant system of the satellite and it is in danger of exploding and releasing harmful radiation into the upper atmosphere of Joe. The satellite has drifted from its orbit and moved into a geostationary orbit above the north pole of the planet. It is using its thrusters which are powered by the nuclear generator to stay in this orbit. You must set the satellite on a path outside of the gravitational pull of Joe in order to save the day. To do so, you have the ability to fire large blobs of a putty-like substance from anywhere on the surface of Joe. The biggest blob you have access to is of mass 5000kg. You also have access to a spring with a spring constant of 4.89*10^10 kg/s^2 to fire a blob to hit the satellite and send beyond the gravitational pull of Joe.
-| Density ($\times 10^{3}\,{\rm kg/m^{3}}$)              |   2.67    |    2.2    |
-| Specific Heat Capacity ($\times 10^{3}\,{\rm J/kg/K}$) |   1.0     |    1.4    |