Consider a situation where a skater pulls her arms inward, causing her rotation rate to speed up. Linear momentum is not conserved
Indicate whether the statement is true or false
F
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A mass of 40.0 grams is attached to a vertical spring with a spring constant k = 20.0 N/m and lowered slowly until the spring stops stretching. How much does the spring stretch?
A) 0.00200 m B) 0.0196 m C) 0.0816 m D) 0.800 m E) 0.200 m
An ideal parallel-plate capacitor consists of two parallel plates of area A separated by a distance d. This capacitor is connected to a battery and charged until its plates carry charges +Q and -Q, and the battery is then disconnected
If the separation between the plates is now doubled, the electrical energy stored in the capacitor will A) double. B) quadruple. C) be cut in half. D) be cut in fourth. E) not change.
What happens to the properties of elements across any period of the periodic table?
A) The elements tend to become more metallic in nature since they are increasing in atomic number. B) The elements get much larger in size because of the addition of more protons and electrons. C) The properties of the elements gradually change across any period of the periodic table. D) All of the above are true.
Helium fusion within a star begins
A) after all the hydrogen within the star has been depleted. B) when all carbon has been depleted. C) because of the force of gravity. D) with the expulsion of practically all hydrogen.