Aplayground merry-go-round of radius 1.6 m has a moment of inertia 192 kg. m2 and is rotating at 11 rev/min about a frictionless vertical axle. facing the axle, a 21 kg child hops onto the merry-go-round, and manages to sit down on the edge. what is the new angular speed of the merry-go-round? answer in units of rev/min.

1. when conducting a test on what kind of music increases the growth of plants, all of the following would fail to meet to fair test standard except (1 point) using different kinds of plants. giving some plants more water than others. exposing the plants to different types of music. using nutrient-rich soil for one and lesser soil for others. 2. engineering uses scientific thinking to solve real-world problems. (1 point) true false 3. what does it mean to test a hypothesis? (1 point) pass a quiz on other scientists’ results analyze only the results from scientific sources not make assumptions about how an experiment will turn out see if the results of an experiment are what the scientist predicted

If we compare the force of gravity to strong nuclear force, we could conclude that

Patients with brain tumors may elect to have a procedure known as gamma knife. in a typical gamma knife procedure gamma rays are directed toward a tumor with contact to surrounding tissues. limiting contact between gamma rays and healthy tissue is important because