Who was the first person of record to calculate by correct methods the circumference of the Earth using shadows on the day the summer solstice
a) Tycho
b)Kepler
c) Eratosthenes
c) Eratosthenes
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Where would you find Van Allen belts of radiation?
a. Within Earth's core b. Within Earth's ozone layer c. Within Earth's magnetosphere d. Within Earth's mantle e. Within Earth's subduction zones
Transformers: The primary of an ideal transformer has 100 turns and its secondary has 200 turns. If the input voltage to the primary is 100 V, we can expect the output voltage of the secondary to be
A. 50 V. B. 100 V. C. 200 V. D. none of the given answers.
In the two-slit experiment, the distance between the slits and the screen is 1.1 m and the distance between the slits is 0.040 mm. If the first-order bright fringe is measured to be 3.4 cm from the centerline,
what is the distance between the adjacent bright fringes? A) 1.7 cm B) 5.1 cm C) 7.0 cm D) 6.8 cm E) 3.4 cm
In thermoplastic polymers, plastic strain is due to the sliding of _____________ molecules.
Fill in the blank(s) with the appropriate word(s).