Which of the following characterizes an alpha ray? Choose all that apply. is attracted to the positively charged plate in an electric field is electromagnetic radiation is composed of particles is less penetrating than a gamma ray carries a positive charge

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.