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A small block on a frictionless, horizontal surface has a mass of 2.90×10-² 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 2.91 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.

A small block on a frictionless, horizontal surface has a mass of 2.90×10-² 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 2.91 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.

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A small block on a frictionless, horizontal surface has a mass of 2.90×10-2 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 2.91 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. Figure 1 of 1 ▼ Y ✓ Correct The net force is due to the tension in the rope, which always acts in the radial direction Part B What is the new angular speed? Express your answer in radians per second. W₂ = Submit Part C AK = Submit Find the change in kinetic energy of the block. Express your answer with the appropriate units. Part D V=| ΑΣΦ G] W Request Answer μA 4 Value Request Answer How much work was done in pulling the cord? Express your answer with the appropriate units. Units HA S S Laite ? ? ? rad/s
Transcribed Image Text:A small block on a frictionless, horizontal surface has a mass of 2.90×10-2 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 2.91 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. Figure 1 of 1 ▼ Y ✓ Correct The net force is due to the tension in the rope, which always acts in the radial direction Part B What is the new angular speed? Express your answer in radians per second. W₂ = Submit Part C AK = Submit Find the change in kinetic energy of the block. Express your answer with the appropriate units. Part D V=| ΑΣΦ G] W Request Answer μA 4 Value Request Answer How much work was done in pulling the cord? Express your answer with the appropriate units. Units HA S S Laite ? ? ? rad/s
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