NASA is sending a probe to Alpha Centauri and then to Sirius. A problem with the probe is noticed while it is at Alpha Centauri, so it must go back to Earth before going to Sirius. Alpha Centauri is 4.3 light-years away from Earth and Sirius is 8.6 light-years away. The probe is traveling at 18.03 km/s, there are 9.461 x 1015 meters in one light-year, and there are 1.58125 x 10 light-years in one astronomical unit. How long will the probe have been traveling from when it first leaves Earth to when it arrives at Sirius? Given the above problem, which of these expressions will most likely be your student's first correct step? a) 40.6823 x 1015 m + 81.3646 x 1015 m b) 4.06823 x 1016 m + 8.13646 x 1016 m c) 81.3646 x 1015 m + 81.3646 x 1015 m d) 8.13646 x 1016 m + 8.13646 x 1016 m e) Answer is not there

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Entropy

In physics, entropy means the amount of disorder or the degree of randomness associated with a thermodynamic system. The system is not self-organized when the entropy of the system is high. For instance, when a system is at an elevated temperature, its molecules are in random motion, vibrating and colliding with each other. During this scenario, the probability of finding a molecule at a particular place twice, is low. Under this circumstance, the system can be said to be in a high entropy.