The discovery of Charon was significant because it allowed astronomers to determine the ________ and ________ of Pluto.
A. radius; speed
B. age; mass
C. speed; distance
D. distance; age
E. mass; radius
Answer: E
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In a ferroelectric material, the electric field in the reverse direction that reduces the polarization to 0 after saturation in the forward direction is called the _________electric field.
Fill in the blank(s) with the appropriate word(s).
Solenoid: An ideal solenoid is wound with 470 turns on a wooden form that is 4.0 cm in diameter and 50 cm long. The windings carry a current in the sense shown in the figure. The current produces a magnetic field of magnitude 4.1 mT, at the center of the solenoid. What is the current I in the solenoid windings? (?0 = 4? × 10-7 T ? m/A)
A. 3.5 A B. 3.0 A C. 2.6 A D. 4.3 A E. 3.9 A
A 4.00 kg mass is moving in a circular path of radius 4.10 m with a constant angular velocity of 5.00 rad/sec. The centripetal force on the mass is
A. 267 N. B. 294 N. C. 302 N. D. 350 N. E. 410 N.
Most Asteroids are found in the asteroid belt, which lies between the orbits of ________.
A. Earth and Mars B. Mars and Jupiter C. Venus and Earth D. Neptune and Pluto E. Saturn and Jupiter