A resistor of unknown resistance and a 15-? resistor are connected across a 20-V emf in such a way that a 2.0 A current is observed in the emf. What is the value of the unknown resistance?
a. 75 ?
b. 12 ?
c. 7.5 ?
d. 30 ?
e. 5.0 ?
d
Physics & Space Science
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A hoop, a solid sphere, and a solid cylinder each have the same mass, radius, and initial speed and are going up the same inclined plane. Which one goes the farthest?
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Physics & Space Science