Which of the following would be an example of basic research? a) spencer's research on wwii radar technology that led to the invention of the microwave oven. b) experimenting to determine the fundamental properties of x-rays. c) edison's research and use of other scientists' work to invent the light bulb. d) morrison and franscioni's research done to create the frisbee.

Two masses are connected by a rope that hangs over a pulley as shown below. the pulley is a uniform cylinder of radius 푅=0.381meters and mass 푀=3.1푘푔. initially 푚"is on the ground and 푚#rests 2.5 meters above the ground. if the system is released, use conservation of energy to determine the speed of 푚#just before it strikes the ground. assume the pulley bearing is frictionless.