Acar goes around a curve of radius r at a constant speed v. then it goes around a curve of radius 2r at speed 2v. what is the centripetal acceleration on the car as it goes around the second curve, compared to the first?

Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?

The built in flash in a compact camera is usally capable of giving correct exsposure for distance up to how many meters?

Awave has a wavelength of 7 mm and a frequency of 19 hertz. what is its speed?