A system of 18 electrons and 11 neutrons has a net charge of
a. –28.8 × 10^-19 C.
b. 28.8 × 10^-19 C.
c. –11.2 × 10^-19 C.
d. –18.0 × 10^-19 C.
e. 11.2 × 10^-19 C.
a
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Why does the riddle say that Earth is not in a special spot?
A: The Sun is at the center of the universe, but the Earth is not. B: The Big Bang explosion sent all material blasting away from the Earth. C: Hubble's law applies to some galaxies but not to others, so many planets besides Earth have their own Hubble's law. D: All space is expanding so Hubble's law would apply around all galaxies. E: Hubble measured the expansion law from the Moon, not from the Earth.
Einstein rejected the classical idea that space and time are
A) two parts of a whole. B) connected to each other. C) independent of each other.
The radius R of a nucleus of mass number A is given by R = R0 A1/3, where R0 = 1.2 × 10-15 m, calculate the density of a nucleus that has contains 57 protons and 82 neutrons. The mass of a nucleon (proton or neutron) is 1.67 × 10-27 kg
What will be an ideal response?
Four identical point charges (+6.0 nC) are placed at the corners of a rectangle which measures 6.0 m × 8.0 m. If the electric potential is taken to be zero at infinity, what is the potential at the geometric center of this rectangle?
a. 58 V b. 63 V c. 43 V d. 84 V e. 11 V