When water is turned on in a shower, the shower curtain moves towards the water spray. This partly involves
A) capillary action.
B) surface tension.
C) pressure changes in moving fluids.
D) none of the above
Answer: C
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In massive stars, three helium atoms fuse together, forming a carbon nucleus. This reaction heats the core of the star. The net mass of the three helium nuclei must therefore be
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