A 2.5-kg object suspended from the ceiling by a string that has a length of 2.5 m is released from rest with the string 40° below the horizontal position. What is the tension in the string at the instant when the object passes through its lowest position?
a. 11 N
b. 25 N
c. 42 N
d. 18 N
e. 32 N
c
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More than 2000 years ago, Hipparchus compared the positions of some stars with their positions recorded nearly two centuries previously and realized that:
A) the celestial poles and equator remained stationery. B) the celestial poles and equator were slowly moving across the sky. C) the stars were moving closer to each other. D) the stars were moving across the sky randomly.
The Leonid meteor shower occurs in mid-November. Which of the following statements regarding the Leonids is true?
A. The shower is best observed very early in the morning, before dawn. B. The radiant of the meteor shower is in the constellation of Leo. C. The shower occurs when Earth crosses the path of an old comet. D. All of these choices are correct.
Fissioning carbon would occur with
A) absorption of energy. B) release of energy. C) neither of these
Size of the Nucleus: Calculate the estimated nuclear radius of 
Sr?
A. 4.0 × 10-15 m B. 1.2 × 10-15 m C. 1.1 × 10-13 m D. 5.4 × 10-15 m E. 3.3 × 10-13 m