A spring on a horizontal surface can be stretched and held 0. 5 m from its equilibrium position with a force of 45n. How much work is done in stretching the spring 3 m from its equilibrium position?.

Consider two metallic rods mounted on insulated supports. one is neutral, the other positively charged. you bring the two rods close to each, but without contact, and briefly ground the the neutral rod by touching it with your hand. show answer correct answer what would be resulting charge (if any) on the initially neutral rod

You add 800 ml of water at 20c to 800 ml of water at 80c what is the most likely final temperature of the mixture ? a. 100c b. 60c c. 25 c d.50c

Which of the following forces require physical contact? tension air resistance friction magnetic force applied force