The graph shows how a star's orbital speed varies with time because of the gravitational tug of an orbiting planet. These data were obtained by measuring __________.
Fill in the blank(s) with the appropriate word(s).
the precise wavelengths of spectral lines in the spectrum of the star
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What do we mean by the event horizon of a black hole?
A) It is the point beyond which neither light nor anything else can escape. B) It is the center of the black hole. C) It is the distance from the black hole at which stable orbits are possible. D) It is the place where x-rays are emitted from black holes.
Charge Q is uniformly distributed over a line segment of length 2L, as shown below. When the x-coordinate of point P is x, the magnitude of the y-component of the electric field at point P is
A.
B.
.C.
.D.
.E.
.Two hoops or rings (I = MR2) are centered, lying on a turntable. The smaller ring has radius = 0.050 m; the larger has radius = 0.10 m. Both have a mass of 6.0 kg. What is the total moment of inertia as the turntable spins? Ignore the mass of the turntable
a. 0.030 kg•m2 c. 0.038 kg•m2 b. 0.0075 kg•m2 d. 0.075 kg•m2
When a capacitor has a charge of magnitude 80 mC on each plate the potential difference across the plates is 16 V. How much energy is stored in this capacitor when the potential difference across its plates is 42 V?
a. 1.0 mJ b. 4.4 mJ c. 3.2 mJ d. 1.4 mJ e. 1.7 mJ