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A massive black hole is believed to exist at the center of our galaxy (and most other spiral galaxies). Since the 1990s, astronomers have been tracking the motions of several dozen stars in rapid motion around the center. Their motions give a clue to the size of this black hole. a. One of these stars is believed to be in an approximately circular orbit with a radius of about 1.50 × 103 AU and a period of approximately 30 yr. Use these numbers to determine the mass of the black hole around which this star is orbiting, b. What is the speed of this star, and how does it compare with the speed of the Earth in its orbit? How does it compare with the
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Chapter 7 Solutions
Physics for Scientists and Engineers: Foundations and Connections
- please solve and answer the question correctly. thank you!! (hint in 2nd photo)arrow_forwardNewton's Laws of Motion - Please help with the first angle calculations of standard deviation and margin of error. I just need a model and I can figure out the other two angles. Thanks!arrow_forward2. A battleship simultaneously fires two shells at enemy ships. If the shells follow the parabolic trajectories shown, which ship gets hit first? a. A b. both at the same time C. B d. need more information battleship Barrow_forward
- A m₁ = 1.70-kg aluminum block and a m₂ = 8.00-kg copper block are connected by a light string over a frictionless pulley. The two blocks are allowed to move on a fixed steel block wedge (of angle 0 = 31.5°) as shown in the figure. (For aluminum on steel, μk k = 0.36.) Мк Aluminum m Copper = 0.47. For copper on steel, Steel m2 Ꮎ (a) the acceleration of the two blocks m/s² (b) the tension in the string Narrow_forwardWhile the 83.3 kg Dora Milaje is in equilibrium, the rope makes a 70.0˚ angle with the horizontal. Assuming the coefficient of friction between her shoes and the ship is 0.772 and her static friction is at its maximum value, what is the tension in the cable?arrow_forwardCan someone help me asnwer this thank youarrow_forward
- Please solve and answer the problem correctly please. Be sure to give explanations on each step and write neatlyplease. Thank you!! ( preferably type the explantion, steps and solution please )arrow_forwardA square coil that has 17.5 cm on each side containing 17 loops lies flat on your desk as shown on this page. A uniform magnetic field of magnitude 4.60 × 10-ST points into this page. If a 8.50-A clockwise Current flows through the coil. ca) determine the torque on the coil. N.m (b) which edge of the coil rises up? choose one 。 Bottom отор and explain. O Right • None of these О Left.arrow_forwardA circular loop of wire with a diameter of 13.0 cm is in the horizontal plane and carries of 1.70 A clockwise, as viewed from underneath. What is the magnitude magnetic field as the center of the loop? -T what is the direction of magnetic field at the center or down? please explain. of the loop? uparrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningPhysics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningUniversity Physics Volume 1PhysicsISBN:9781938168277Author:William Moebs, Samuel J. Ling, Jeff SannyPublisher:OpenStax - Rice University
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