Physics, 21.11.2019 20:31 andybiersack154
Acouple of astronauts took a spacecraft to a certain galaxy. when they left the earth with a constant speed of 0.95c, the female astronaut found that she was pregnant. after 10 months spacecraft time, a male baby was born and the male astronaut immediately sent out the message to the earth with speed of light to apply for a birth certificate. if we neglect the acceleration time that the spacecraft took off, how far was the spacecraft observed by the earth people when the baby was born? when did the application signal reach the earth according to the city government? if the date that the couple left is march 2nd, 2040, what is the birthday of the baby in the earth time? (15%)
Answers: 1
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Amerry-go-round of radius r, shown in the figure, is rotating at constant angular speed. the friction in its bearings is so small that it can be ignored. a sandbag of mass m is dropped onto the merry-go-round, at a position designated by r. the sandbag does not slip or roll upon contact with the merry-go-round. how would you rank the following different combinations of m and r on the basis of the angular speed of the merry-go-round after the sandbag "sticks" to the merry-go-round from largest to smallest. a) m = 10kg, r = 0.25r b) m = 20kg, r = 0.25r c) m = 10kg, r = 0.50r d) m = 10kg, r = 1.0r e) m = 15kg, r = 0.75r f) m = 40kg, r = 0.25r
Answers: 1
Acouple of astronauts took a spacecraft to a certain galaxy. when they left the earth with a constan...
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