In a neutron star, the core is
A) primarily iron and silicon.
B) electrons and protons packed so tightly they are in contact.
C) made of compressed neutrons in contact with each other.
D) no longer rotating.
E) constantly expanding and contracting.
C
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Changes in Earth's history are recorded
A) in the rock record. B) in magnetic tape at the bottom of the oceans. C) by rocks at the Library of Congress. D) Moon rocks.
A hydraulic lift is designed with an output cylinder that has 36 X the area of the input cylinder. If a force F is applied to the input cylinder, the output cylinder can supply a force equal to _______.
A. 1/6 F B. 1/36 F C. 6 F D. 36 F
A point source of light is positioned 20.0 m below the surface of a lake. What is the diameter of the largest circle on the surface of the water through which light can emerge?
What will be an ideal response?
A point charge (5.0 pC) is located at the center of a spherical surface (radius = 2.0 cm), and a charge of 3.0 pC is spread uniformly upon this surface. Determine the magnitude of the electric field 1.0 cm from the point charge.
A. 0.72 kN/C B. 0.45 kN/C C. 0.63 kN/C D. 0.90 kN/C E. 0.18 kN/C