Physics, 14.01.2021 02:10 marahsenno
Which two options describe behaviors of particles that are related to the
chemical properties of the materials?
A. Allowing electrons to move freely between them
B. Easily forming bonds with atoms of other elements
C. Changing their positions relative to one another
O
D. Combining with oxygen atoms to form a new substance
Answers: 1
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Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?
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The ultracentrifuge is an important tool for separating and analyzing proteins. because of the enormous centripetal accelerations, the centrifuge must be carefully balanced, with each sample matched by a sample of identical mass on the opposite side. any difference in the masses of opposing samples creates a net force on the shaft of the rotor, potentially leading to a catastrophic failure of the apparatus. suppose a scientist makes a slight error in sample preparation and one sample has a mass 10 mg larger than the opposing sample. if the samples are 12 cm from the axis of the rotor and the ultracentrifuge spins at 70,000 rpm, what is the magnitude of the net force on the rotor due to the unbalanced samples? ( be thorough on your answer)
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Awater slide of length l has a vertical drop of h. abby's mass is m. an average friction force of magnitude f opposes her motion. she starts down the slide at initial speed vi. use work-energy ideas to develop an expression for her speed at the bottom of the slide. then evaluate your result using unit analysis and limiting case analysis. express your answer in terms of the variables h, m, l, vi, f and appropriate constants. vf v f
Answers: 2
Which two options describe behaviors of particles that are related to the
chemical properties of th...
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