Since an electron is so less massive than a proton, what is the approximate mass and charge of a neutral hydrogen atom?
a. the mass of an electron, negative b. the mass of a proton, neutral
c. the mass of a neutron, positive d. the mass of a proton and neutron, positive
b
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Ancient philosophers and astronomers accepted without question-as first principles-that:
A) heavenly objects must move in circular paths at varying speeds.
B) the planets are made of rock and gas, much like Earth.
C) the Earth is motionless at the center of the Universe.
D) there are many galaxies in the Universe.
A ball is thrown vertically upward with an initial speed of 20 m/s. Two seconds later, a stone is thrown vertically (from the same initial height as the ball) with an initial speed of 24 m/s. At what height above the release point will the ball and stone pass each other?
a. 17 m b. 21 m c. 18 m d. 27 m e. 31 m
If the net flux through a closed surface is zero, then there can be no charge or charges within that surface
Indicate whether the statement is true or false
A puddle of water (n = 1.33) is covered with a very thin layer of oil (n = 1.20). How thick is the oil in the region that strongly reflects light with a wavelength of 531 nm?
a. 111 nm b. 221 nm c. 443 nm d. 295 nm e. 239 nm