If a conductor is placed in an electric field under electrostatic conditions, the electric field is excluded from the inside of the conductor
Indicate whether the statement is true or false
TRUE
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Consider a star with 2 planets. The mass of planet A is the same as the mass of planet B. The orbit of Planet A is on average, closer to the star than the orbit of Planet B. Which of the following statements is true?
A) Planet A moves with the same speed as Planet B. B) Planet A is, on average, moving slower than Planet B. C) The relative orbital speeds depend on the masses of the planets. D) Planet A is, on average, moving faster than Planet B.
The moon and visible planets are always within a few degrees of the ecliptic
Indicate whether the statement is true or false
It is more difficult to determine the total amount of dark matter in an elliptical galaxy than in a spiral galaxy. Why?
A) Elliptical galaxies lack the atomic hydrogen gas that we use to determine orbital speeds at great distances from the centers of spiral galaxies. B) Elliptical galaxies contain much less dark matter than spiral galaxies, so it's much more difficult to measure. C) Stars in elliptical galaxies are dimmer, making them harder to study. D) cannot observe spectral lines for elliptical galaxies.
An element has an atomic mass number of 14 and atomic number 6. (a) How many protons does it have? (b) How many neutrons does it have?
What will be an ideal response?