Ohm's Law: What is the voltage drop across a 5.0-? resistor if the current through it is 5.0 A?
A. 100 V
B. 25 V
C. 4.0 V
D. 1.0 V
Answer: B
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Tripling the separation between charges changes the potential energy of a pair of point charges by a factor of
A. 3. B. 9. C. 1/3. D. 1/9. E. 1 (no change).
Which of the following statements about Pluto is true?
A) It has more in common with other icy objects in the Kuiper belt than it does with the jovian planets (Jupiter, Saturn, Uranus, Neptune). B) It is the most massive object that orbits the Sun beyond the orbit of Neptune. C) It is orbited by only one moon. D) It is the only object in our solar system that is categorized as a "dwarf planet."
Where does your body get the energy it uses to make your heart beat?
A) It comes from the radiative energy of the sunlight that hits your skin. B) It comes from the chemical potential energy of the food you eat. C) It comes from the thermal energy of the water you drink. D) It comes from the kinetic energy of the molecules in the air that you breathe in. E) It is created by your brain during the time that you rest or sleep.
A space station of diameter 40. meters is turning about its axis at a constant rate. What is the period of revolution of the space station if the outer rim experiences an acceleration of 2.5 m/s2?
A) 10. s B) 14. s C) 11. s D) 13. s E) 18. s