Rotational Kinetic Energy: A disk, a hoop, and a solid sphere are released at the same time at the top of an inclined plane. They are all uniform and roll without slipping. In what order do they reach the bottom?
A. disk, hoop, sphere
B. hoop, sphere, disk
C. sphere, disk, hoop
D. sphere, hoop, disk
E. hoop, disk, sphere
Answer: C
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a. 4.8 m/s2 b. 2.0 m/s2 c. 4.0 m/s2 d. 6.3 m/s2
A star's absolute magnitude depends only on the star's
a. distance and diameter. b. temperature and distance. c. distance. d. temperature and diameter. e. apparent magnitude.
An ideal transformer consists of a 500-turn primary coil and a 2000-turn secondary coil. If the current in the secondary is 3.0 A, what is the current in the primary?
A) 0.75 A B) 1.3 A C) 12 A D) 48 A
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