A 2.00-kg mass oscillates on the end of a spring with spring constant 12.0 N/m
Its amplitude of oscillation decreases from 10.0 cm to 1.0 cm in 2.00 s. What is the angular frequency at which this oscillator will have its peak amplitude?
A)
7.28 s-1
B)
0.622 s-1
C)
2.45 s-1
D)
2.16 s-1
E)
0.311 s-1
D
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The number of electrons delivered daily to an average American home by an average power utility in the early 21st century was
A) zero. B) 110. C) 220. D) billions of billions. E) none of the above
What makes us think that the star system Cygnus X-1 contains a black hole?
A) It emits x-rays as we expect from a system with an accretion disk, but the unseen star in the system is too massive to be a neutron star. B) No light is emitted from this star system, so it must contain a black hole. C) The fact that we see strong x-ray emission tells us that the system must contain a black hole. D) Cygnus X-1 is a powerful x-ray burster, so it must contain a black hole.
An object is made up of three masses connected by massless rods of fixed length
Mass A is located at (30.0 cm, 0 cm) and has a mass of 250 grams, mass B is located at (0 cm, 30.0 cm) and has a mass of 350 grams, mass C is located at (-30.0 cm, 0 cm) and has a mass of 450 grams. What is the moment of inertia of this object about an axis perpendicular to the x-y plane and passing through the origin? A) 0.0945 kg m2 B) 0.315 kg m2 C) 0.185 kg m2 D) 0.0135 kg m2 E) 0.0450 kg m2
An observer in the Southern Hemisphere takes a time exposure photograph of the night sky. If the illustration below depicts the photograph taken by the observer, which direction was the camera pointing?
a.
straight north
b.
straight east
c.
straight south
d.
straight west
e.
straight up, directly overhead