Given that the above energy profiles have the same scale, which of the reactions would require the most energy?
A) a
B) b
C) c
D) d
E) none of the above
Answer: D
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Two solenoids are each made of 2000 turns of copper wire per meter. Solenoid I is 2 m long, while solenoid II is 1 m long. When equal currents are present in the two solenoids, the ratio of the magnetic field BI along the axis of solenoid I to the magnetic field BII along the axis of solenoid II, BI/BII, is
a. 1/4. b. 1/2. c. 1. d. 2 e. 4.
Suppose you slowly lift a book from the floor and put it on a table. Which of the following energy transformations best describes the overall process?
A) kinetic to gravitational B) kinetic to chemical C) gravitational to chemical D) chemical to gravitational E) thermal to gravitational
An object is 10 cm in front of a concave spherical mirror with a focal length of magnitude 3.0 cm. Where is the image?
A) 13 cm from the mirror B) 7.0 cm from the mirror C) 4.3 cm from the mirror D) 3.3 cm from the mirror
To find the distance of nearby stars, we use their parallaxes obtained over ________-month intervals
A) one B) three C) six D) twelve E) twenty-four