Two tennis balls fall through the air from a tall building. One of them is filled with lead pellets. The ball to reach the ground first is the
A) regular ball.
B) lead-filled ball.
C) same for both
Answer: B
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The entropy of a perfect crystal at absolute zero kelvin with the atoms at rest is equal to _____________.
Fill in the blank(s) with the appropriate word(s).
Solenoid: An ideal solenoid 20 cm long is wound with 5000 turns of very thin wire. What strength magnetic field is produced at the center of the solenoid when a current of 10 A flows through it? (?0 = 4? × 10-7 T ? m/A)
A. 0.0063 T B. 0.20 T C. 3.2 T D. 4.8 T E. 0.31 T
Two tiny metal spheres are fixed to the ends of a non-conducting string of length 
. Equal charges, +q, are placed on the metal spheres. Randall says that the force on the string has magnitude 
. Tilden says that the tension in the string has magnitude 
style="vertical-align: -22px;" width="71px" height="59px" align="absmiddle" />. Which one, if either, is correct?
A.
.B.
.C.
D.
.E.
, but the net force is 0.If a cool dry day was followed by a warm humid day, you might expect they resulted from which of the following consecutive air masses?
A) maritime tropical (mT) followed by continental polar (cP) B) maritime polar (mP) followed by maritime tropical (mT) C) continental polar (cP) followed by maritime tropical (mT) D) continental tropical (cT) followed by continental polar (cP)