leslien3003
02.11.2021 •
Physics
As you'll learn in the next module, astronomers use lots of different kinds of telescopes that work at different wavelengths across the EM spectrum. We have optical telescopes, like the Hubble, but also radio telescopes, infrared telescopes, UV telescopes, X-ray telescopes, etc. Say you wanted to study brown dwarfs - stellar-like objects that are a bit smaller and cooler than "regular" stars (we'll learn more about these later on in the course). Brown dwarf surface temperatures average around 1000K. What type of telescope should you use? i.e. what wavelength range should it operate at to have the best chance of detecting these types of stars? Explain your reasoning clearly and show your work.
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Ответ:
Translation
A tractor pulling a cart loaded with sugar cane travels down the straight path of a farm at a speed of 20 km / h. If at 3:00 p.m.you pass the Finca Las Margaritas, what time will you arrive at the Las Ilusiones farm, located on the same road, if the distance between the two farms is 60 km
6.00 pm
Explanation:
Speed is given by dividing distance by time and expressed as s=d/t. Making time the subject of the formula then t=d/s where s is the speed, d is distance covered and t is the time taken. Substituting 20 km/h for s and 60 km for d then t=60/20=3 hours
Adding 3 hours to 3 pm we get 6pm
Therefore, the time to reach the destination if the speed is constantly maintained is 6.00 pm