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A playground merry-go-round has radius 2.50 m and moment of inertia 3000 kg m^2 about a vertical axle through its center, and it turns with negligible friction.
A child applies an 20.5 N force tangentially to the edge of the merry-go-round for 25.0s. If the merry-go-round is initially at rest, what is its angular speed after this 25.0 s interval?
How much work did the child do on the merry-go-round?
What is the average power supplied by the child?
A 50 gram ball enters a a pendulum with mass 200 g. The pair then swings up to a height of 14.5 cm. Find the initial velocity of the ball before the collision
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A car is traveling 80 km/hr in a school zone. A police car starts from rest just as the speeder passes it and accelerates at a constant rate of 8 km/hr·s. Eluciadte when does the police car catch the speeding car?
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Consider a region of space with volume 80 mm3. Suppose the energy stored in the electric field of that particular region of space is 35 J. What is the average electric field strength in this region?
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