Author Question: Car J moves twice as fast as car K, and car J has half the mass of car K. The kinetic energy of car ... (Read 27 times)

penguins · **on:** Jul 27, 2018

Car J moves twice as fast as car K, and car J has half the mass of car K. The kinetic energy of car J, compared to car K is

A) 4 to 1.
B) 2 to 1.
C) the same.
D) 42to 1.
E) 1 to 2.

Question 2

The wavelengths of radiation from a star that is moving perpendicular to us

A) can be longer or shorter depending on the distance to the star
B) are shorter than if the star were not moving
C) are longer than if the star were not moving
D) are the same as if the star were not moving