The central core of the atom is called the ______________
Fill in the blank(s) with correct word
nucleus
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Because of refraction, a person standing waist deep in a swimming pool appears to have
A) shorter legs. B) longer legs. C) thinner legs. D) none of the above
If a 0.20 pF capacitor has a voltage of 40 mV, how many more electrons are on the negative plate than on the positive plate?
a. 
b. 
c. 
d. 
e. none, the electrons are in equal numbers on the plates
Two small objects are suspended from threads. When the objects are moved close together, they attract one another. Which of the following could produce this result?
a. One object is negatively charged and the other is uncharged. b. One object is positively charged and the other is uncharged. c. One object is positively charged and the other is negatively charge. d. All of the above could result in such attraction.
When a workman strikes a steel pipeline with a hammer, he generates both longitudinal and transverse waves. The two types of reflected waves return 2.4 s apart. How far away is the reflection point? (For steel, vL = 6.2 km/s, vT = 3.2 km/s)