A small block on a frictionless, horizontal surface has a mass of 2.60x10-2 kg. It is...

 

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A small block on a frictionless, horizontal surface has a mass of 2.60x10-2 kg. It is attached to a massless cord passing through a hole in the surface (Figure 1). The block is originally revolving at a distance of 0.300 m from the hole with an angular speed of 2.21 rad/s. The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.150 m. Model the block as a particle. Flgure 1 of 1 Part A Is angular momentum of the block conserved? C yes C no Part B What is the new angular speed? Express your answer in radians per second. ΑΣΦ ? W2 = rad/s Part C Find the change in kinetic energy of the block. Express your answer with the appropriate units. HÀ AK = Value Units Part D How much work was done in pulling the cord? Express your answer with the appropriate units. ? W = Value Units 國 A small block on a frictionless, horizontal surface has a mass of 2.60x10-2 kg. It is attached to a massless cord passing through a hole in the surface (Figure 1). The block is originally revolving at a distance of 0.300 m from the hole with an angular speed of 2.21 rad/s. The cord is then pulled from below, shortening the radius of the circle in which the block revolves to 0.150 m. Model the block as a particle. Flgure 1 of 1 Part A Is angular momentum of the block conserved? C yes C no Part B What is the new angular speed? Express your answer in radians per second. ΑΣΦ ? W2 = rad/s Part C Find the change in kinetic energy of the block. Express your answer with the appropriate units. HÀ AK = Value Units Part D How much work was done in pulling the cord? Express your answer with the appropriate units. ? W = Value Units 國

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