The eighteenth-century astronomer Herschel and the early twentieth-century astronomer Kapteyn both concluded from measurements of star positions in the Milky Way that the Sun was close to the center of the Galaxy. What misled them in reaching this erroneous conclusion?

The ph is the a. independent variable b. the dependent variable c. control group

Astudent weighing 700 n climbs at constant speed to the top of an 8 m vertical rope in 10 s. the average power expended by the student to overcome gravity is most nearly

It may seem strange that the selected velocity does not depend on either the mass or the charge of the particle. (for example, would the velocity of a neutral particle be selected by passage through this device? ) the explanation of this is that the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line and will not pass through the exit slit. if the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. because the acc