UNDERSTANDING THE UNIVERSE(LL)-W/CODE
UNDERSTANDING THE UNIVERSE(LL)-W/CODE
3rd Edition
ISBN: 9780393869903
Author: PALEN
Publisher: NORTON
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Chapter 7, Problem 32QAP
To determine

The environmental condition due to which camera stopped working.

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A surprisingly large number of people in the world don’t believe that astronauts havewalked on the Moon. They believe the Moon landing to have been a hoax. One argumentthey use is that if there are astronaut footprints on the Moon, we should be able to seethem using a powerful telescope. The fact that we do not, they say, is evidence that theywere never there.The Lunar Reconnaissance Orbiter (LRO) is a NASA robotic spacecraft currently orbitingthe Moon. The LRO gets as close as 35 km to the Moon’s surface. The diameter ofthe camera’s primary mirror is 195 mm. If the camera is sensitive to optical light at awavelength of 600 nm, show that it would not be able to spatially resolve a foot print ofphysical length 30 cm when it is 35 km above the Moon’s surface.Tip: You’ll need to calculate the angular size of the footprint, as seen from a height of35 km. θ = S/D, where S is the physical size of the footprint and D = 35 km, is theangular size of the footprint in radians.
What will be the minimum size of a Martian surface feature resolvable during the 2003 opposition by an Earth-based telescope with an angular resolution of 0.05"?
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?
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