4. In question 3, will the measured wavelength of the sound be longer or shorter than if both you and the train were at rest?
a) longer because the pitch is higher
b) shorter because the pitch is unchanged
c) shorter because the pitch is higher
d) the same because only the pitch changes, not the wavelength

Copper has free electrons per cubic meter. a 71.0-cm length of 12-gauge copper wire that is 2.05 mm in diameter carries 4.85 a of current. (a) how much time does it take for an electron to travel the length of the wire? (b) repeat part (a) for 6-gauge copper wire (diameter 4.12 mm) of the same length that carries the same current. (c) generally speaking, how does changing the diameter of a wire that carries a given amount of current affect the drift velocity of the electrons in the wire?

If it takes a planet 2.8 x 10^8 s to orbit a star with a mass of 6.2 x 10^30 kg what is the average distance between the planet and the star

The heliocentric and the geocentric models of the solar system included these central principles