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Astronomers believe that there is a massive black hole at the center of the Milky Way galaxy. What evidence is there for that?
A group of astronomers have observed a star "S2" in a 15.2-year orbit around the center of the galaxy. They measured the period of revolution T = 15.2 years, the eccentricity of the elliptical orbit ? = 0.87, and the semimajor axis of the orbit a = 4.62 mpc. [The unit: mpc = milli-parsec = 0.001 parsec.]
(A) Calculate the mass of the compact object about which S2 is revolving.
(B) Compare the mass to the mass of the sun.
(C) Compare the radius of the orbit of S2, to the size of our solar system.
Imagine removing one electron from every atom in a tiny cube of gold 1 mm on a side. (Never mind how you would hold the resulting positively charged cube together.) Do the same thing with another such cube a meter away.
A metal sphere with radius r_a is supported on an insulating stand at the center of a hollow, metal spherical shell with radius r_b. There is charge + q on the inner sphere and charge - q on the outer spherical shell. Take potential V to be zero w..
A 10 kg runaway grocery cart runs into a spring with spring constant 240N/m and compresses it by 65cm. What was the speed of the cart just before it hit the spring.
What is Seth’s angular position at = 3.2 measured counterclockwise from the top? Give your answer as an angle in degrees between 0 and 360 degrees.
X-rays with an energy of 300 KeV undergo Compton scattering from a target. What is the speed of the recoiling electron
A bug of mass 1.0 grams is caught up in the center of an oscillating spider web. show that this motion is generated by hooke's law force, f=-kx
On a part-time job, you are asked to bring a cylindrical iron rod of density 7800kg/m3 , length 79.9cm, Calculate the weight of the rod, w
A 96-kg man's thighbone has a relaxed length of 0.56 m, a cross-sectional area of 6.7 10-4 m2, By how much does the thighbone compress when the man is standing on both feet
q1. in accordance to one estimate the first atomic bomb released an energy equivalent to 20 kilotons of tnt. if 1 ton
Distinguish constructive conflict from socio emotional conflict and explain how to apply the former without having the latter become a problem.
A projectile is launched straight up at 141 m/s. How fast is it moving at the top of its trajectory? Suppose it is launched upward at 45 degrees above the horizontal plane. How fast is it moving at the top of its curved trajectory and what is the ..
Explain what was observed with the horizontal motion of the man and the boat in terms of Newton's Laws of Motion.
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