Decoupling refers to the separation of matter and antimatter during inflation
Indicate whether the statement is true or false
FALSE
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Which telescope has the largest light-gathering power among the following telescopes?
A) A telescope of diameter 5 cm and focal length 50 cm B) A telescope of diameter 6 cm and focal length 100 cm C) A telescope of diameter 2 cm and focal length 100 cm D) A telescope of diameter 3 cm and focal length 75 cm
A meterstick is shot from a meterstick projector at a speed of 0.90c. How long will it be relative to an observer's frame of reference?
A. 2.3 m B. 0.91 m C. 1.0 m D. 0.44 m E. 0.81 m
What evidence supports the existence of a black hole at the center of our galaxy?
A) The motions of the gas and stars at the center indicate that it contains 4 million solar masses within a region only 3 light-years across. B) We observe a large, dark object that absorbs all light at the center of our galaxy. C) We can see gas falling into an accretion disk and past the event horizon of a black hole. D) We observe an extremely bright X-ray source at the center of our galaxy. E) All of the above
A piano wire has a radius of 0.50 mm. One end is fixed and the other is wrapped around a tuning peg, which has a diameter of 3.5 mm and is 80 cm away. After the wire just becomes taut, the peg is given three full turns
What is the tension in the wire? Young's modulus for steel is 20 × 1010 N/m2. A) 3.8 kN B) 4.3 kN C) 6.5 kN D) 8.7 kN E) 9.8 kN