Which of the following statements is true? a)a hypothesis is created at the end of an experiment. b)the dependent variable is changed by the experimenter. c)the best hypotheses are written as answers to a question. d)observations are often used to form questions about the world. answer asap

Mike wants to negatively charge a small rubber ball. which of these methods would successfully charge the ball? a) heating the ball in boiling water b) running the ball over a strong magnet c) rubbing the ball back and forth on carpet d) dropping the ball from a tall bulding submit hint forces in nature (s8p5.b) conductors and insulators id: 10402 hint electrons must be transferred.