How have astronomers determined the mass of the Milky Way's supermassive black hole?
What will be an ideal response?
Stars near the galactic center are in elongated, high-speed orbits around Sgr A*. Astronomers can use the orbit of one object around another to determine the masses of the objects.
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Which one of the following statements is true concerning resistors connected in parallel within an electric circuit?
a) The potential difference across each of the resistors is the same. b) The current through each of the resistors is the same. c) The energy dissipated by each of the resistors is the same. d) The resistance of each of the resistors is the same. e) The resistivity of each of the resistors is the same.
A supersonic plane passes overhead at a speed of 500 m/s. If you hear the sonic boom (shock wave) 4.00 s after the plane is directly overhead, at what altitude is the plane flying? Assume the speed of sound in air is 340 m/s
A) 1.36 km B) 2.16 km C) 1.85 km D) 2.45 km E) The plane is not flying fast enough to produce a shock wave.
What is the speed of a 6-kg ball with a momentum of 72 kg?m/s?
A) 3 m/s B) 4 m/s C) 12 m/s D) 48 m/s E) none of the above
A light bulb used in a slide projector draws a current of 6 amperes when operating on 120 volts.The resistance of the light bulb is __________
Fill in the blank(s) with correct word