The following objects are sitting on a table, one meter above the floor. Which object will have the most potential energy?

a. a pea
b. a tomato
c. a grape
d. a watermelon


Answer: d. a watermelon

Physics & Space Science

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Compared to Jupiter and Saturn, Uranus and Neptune

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What characteristic of sound determines the "pitch" of a musical note?

A) amplitude B) wavelength C) frequency D) phase E) intensity

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Two uses of ultrasound are navigation by bats and controlling insects

Indicate whether the statement is true or false

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Radiation Doses: A 70-kg researcher absorbs 4.5 × 108 neutrons in a work day, each of energy 1.2 MeV. The relative biological effectiveness (RBE) for these neutrons is 10. What is the equivalent dosage of the radiation exposure for this researcher, in millirem?

A. 1.2 mrem B. 0.39 mrem C. 0.77 mrem D. 3.7 mrem E. 12 mrem

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