Physics, 28.10.2020 21:30 teresaparraz34
The model of the atom has changed over time in light of new knowledge and discoveries. Which option correctly describes one such change?
a. In 420 B. C., John Dalton developed the idea that small atoms combined to form molecules.
b. About 1900, Neils Bohr developed an atomic model where positively charged particles orbit a negatively charged nucleus.
c. About 1900, J. J. Thomson discovered electrons were negatively charged particles.
d. About 1915, J. J. Thomson developed an atomic model where negatively charged particles orbit a positively charged nucleus.
Answers: 3
Physics, 22.06.2019 05:30, dxpebetty64
Astudent pushes on a 20.0 kg box with a force of 50 n at an angle of 30° below the horizontal. the box accelerates at a rate of 0.5 m/s2 across a horizontal floor. what is the value of the normal force on the box? 200 n 243 n 156 n 225 n
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Physics, 22.06.2019 10:00, issaaamiaaa15
Which is the correct symbol for an isotope of iodine with 53 protons and 78 neutrons?
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Physics, 22.06.2019 13:30, sukiyoshi10
Global warming will produce rising sea levels partly due to melting ice caps but also due to the expansion of water as average ocean temperatures rise. to get some idea of the size of this effect, calculate the change in length of a column of water 1.00 km high for a temperature increase of 1.00ºc. note that this calculation is only approximate because ocean warming is not uniform with depth. (answer in ×10^{-3} −3 m)
Answers: 1
The model of the atom has changed over time in light of new knowledge and discoveries. Which option...
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