Which event happened before the pacific railroad act was signed in 1862? asa whitney asked for the right to build a transcontinental railroad. The end of the civil war freed men to work on the railroad. The golden spike ceremony was held on the transcontinental railroad. Railroad workers blasted tunnels through the sierra nevada.

Ateacher attaches a ball to a meter long string and whirls it around in a horizontal circle at constant speed. the teacher explains that the string is what makes the ball go in a circle. why is the string necessary? a) the string is needed to apply a torque to the ball. b) the string is needed to push on the ball to get it up to speed. c) circle motion requires an inertia which is provided by the string. d) circle motion requires a force to give it a centripetal acceleratio