Asmall metal ball is suspended from the ceiling by a thread of negligible mass. the ball is then set in motion in a horizontal circle so that the thread’s trajectory describes a cone. the acceleration of gravity is 9.8 m/s 2 . r v g ℓ m θ what is the speed of the ball when it is in circular motion? answer in terms of g, ℓ and θ.

30 points - when can a theory be modified if a new type of technology allows for new observations that raise new questions? a. immediately, while the questions about the theory are being asked b. after new hypotheses related to the theory are tested in experiments c. only after the new observations disprove all parts of the theory d. while scientists begin to think about how the theory could improve

How many meters will a car travel if its speed is 45 m/s in an interval of 11 seconds? question 2 options: a) 450 meters b) 495 meters c) 4.09 meters d) 498 meters

Another word for electromagnetic energy is a. heat b. force c. matter d. radiation