Quantitative Astronomy Guided Notes.docx

D 100000 x 4320 km d 432 x 108 km 3 dvt d 65

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d = 100,000 x 4320 km d = 4.32 x 10^8 km 3. d=vt d= 65 miles/hour x 0.33 hours d= 65 x 0.33 miles = 22 miles 4. d=vt d/v=vt/v d/v=t 5. 1 km/1000 m = 1 1.5 x 10^11 m x 1 km/1000 m = 1.5 x 10^8 km t = 1.5 x 10^8 km/3 x 10^5 km/s = 500 s 500 s for light to get from the Sun to Earth
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Your Turn – Trip to Jupiter What if the spacecraft was going to Jupiter and it took 5 years to get there? How far does it go if it’s moving at 16,000 km/hr? Answer: D=vt d = 16000 km/hour x 5 years 1 year = 8760 hours = 8760 hours/1 year 5 years = 5 x 8760 hours/1 year = 43800 hours d = 16,000 km/hr x 43800 hours d = 8.61x10^8 km When asking the question “Does It Make Sense?”, what questions should you ask yourself to see if your answer to a question is reasonable? Answer: If the units agree, answer makes sense by numbers, larger or smaller than a given value, be skeptical of numbers! What three things you can do when you’ve found that an answer doesn’t make sense? 1. Go back and check your work 2. Ask for help 3. Write down the fact that you see it isn’t right Making Sense of Equations – Table Filling Formula Name Variables Units What is it good for? t = d/v time t Seconds, hours, days, years The amount of time an object takes to do something distance d Meters, kilometers, miles How far an object goes velocity v m/hr, km/hr How fast/slow an object goes
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