Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 12, Problem 56Q
To determine
The observations, measurements, and analysis be collected by an unmanned spacecraft, planned on mission to Jupiter, which would be spending many days (months) flying through the Jovian clouds. Also mention the threats that this spacecraft would encounter and the ways to overcome the problems in design.
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Prompt: You are on the Sensor and Data Acquisition engineering team for the new NASA space rover program: the Unmanned Mobile Assessment Drone for Basic Reconnaissance and Observation. Your team is working with a very low budget, and have been given a hand-me-down drone which was repurposed from an old Mars mission.
The drone has already landed successfully on Saturn. It’s first task was to travel 4.6 m to a rock and then use it’s built in drill to take a sample. Unfortunately, it appears that the drone stopped very short, only traveling 1.32 m instead of the 4.6 m. Everything about the ultrasonic distance sensor that the drone uses to move with seems to be operating correctly. When you requested details from the drone, it said that the time it took for the 40 kHz ultrasonic sound wave to travel to the rock and back was 0.0108 seconds.
Why did the drone only travel 1.32 m, given the 0.0108s echo time?
In 2015, researchers concluded that Enceladus's subsurface ocean is probably global, instead of just being restricted to the south polar region. What had the Cassini spacecraft found, that led them to their conclusion?
a Enceladus wobbles slightly as it orbits Saturn, more so than it could if its ice shell were mostly frozen to the rocky interior.
b Enceladus is absorbing so much water (which is ejected by Saturn from its atmosphere) that there must be a global ocean under its icy surface.
c The number of large, lava-spewing volcanoes on Enceladus's surface is so high that they can only be the result of liquid water under the whole surface.
d The magnetic field of Enceladus is so strong that it can only be explained by a global ocean of salty water under the surface.
(a) What is the difference between the forces on a 1.0-kg mass on the near side of Io and far side due to Jupiter? Io has a mean radius of 1821 km and a mean orbital radius about Jupiter of 421,700 km. (b) Compare this difference to that calculated for the difference for Earth due to the Moon calculated in Example 13.14. Tidal forces are the cause of Io’s volcanic activity.
Chapter 12 Solutions
Universe
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