# Homework 3.docx - Homework 3 1. How far away would you have...

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Homework 31. How far away would you have to move from the Sun (luminosity = 4x1026Watts)before it appeared as bright as a 100-Watt light bulb appears from 2 meters away (assuming all100 Watts are converted into light)?
2. The New Horizons probe is currently traveling at 14.1 km/s. How long would ittake to reach Proxima Centauri (distance: 4 light years) at this speed?
3. When 4 hydrogen atoms fuse into 1 helium atom, the helium atom is 5x10-29kgless massive than the sum of 4 hydrogen atoms (that is, 5x10-29kg of hydrogen is converted intoenergy). How much energy is released in this reaction?
4. Explain how a gravity assist serves to accelerate a spacecraft.

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Term
Winter
Professor
VirginaTrimble
Tags
Planet, Pluto