The electric field 1.5 cm from a very small charged object points toward the object with a magnitude of 180,000 N/C. What is the charge on the object? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) +4.5 nC B) -5.0 nC C) +5.0 nC D) -4.5 nC
D
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Dark matter ____
a. is homogenously distributed through the Universe b. began clumping due to tiny variations in density at the moment of the big bang c. began clumping due to large variations in the distribution of matter and antimatter d. is isotropically distributed through the Universe e. began clumping due to the variations in the distribution of baryonic matter
What was Cecilia Payne's discovery?
A. She showed how to calculate the level in which an atom's electrons were most likely to be found. B. She proved that stars are composed mainly of hydrogen. C. She classified stellar spectra by temperature. D. All of these choices are correct.
The infall of material in the Galactic halo to the Galactic disk stopped shortly after the formation of globular clusters
Indicate whether the statement is true or false
A nonuniform 2.0-kg rod is 2.0 m long. The rod is mounted to rotate freely about a horizontal axis perpendicular to the rod that passes through one end of the rod. The moment of inertia of the rod about this axis is 4.0 kg/m2 . The center of mass of the rod is 1.2 m from the axis. If the rod is released from rest in the horizontal position, what is its angular speed as it swings through the
vertical position? a. 3.4 rad/s b. 4.4 rad/s c. 4.3 rad/s d. 5.8 rad/s e. 6.8 rad/s