A 55-kg person riding a bike puts all her weight on each pedal when climbing a hill. The pedals rotate in a circle of radius 18 cm. Part A What is the maximum torque she exerts? Express your answer to two significant figures.
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- A merry-go-round accelerates from rest to 0.70 rad/s in 30 s. Part A Assuming the merry-go-round is a uniform disk of radius 8.0 m and mass 3.20×104 kg , calculate the net torque required to accelerate it. Express your answer to two significant figures and include the appropriate units.A 40-N weight hangs from a (massless inelastic) cord that runs around the outside of a pulley. The pulley is a uniform solid disk of radius 12.8 cm and mass 6.5 kg. You may assume the system is released from rest. Determine the angular acceleration of the pulley. Express your answer in rad/s², to at least one digit after the decimal point. 40 NA 2.6-m-diameter merry-go-round with rotational inertia 140 kg. m² is spinning freely at 0.60 rev/s. Four 25-kg children sit suddenly on the edge of the merry-go-round. Part A Find the new angular speed. Express your answer using two significant figures. V= for Part A for Part A undo for Part A redo for Part A reset for Part A keyboard shortcuts for Part A help for Part A Submit Part B Determine the total energy lost to friction between the children and the merry-go-round. Express your answer using two significant figures. AK = Request Answer Submit rev/s for Part B for Part B undo for Part B redo for Part B reset for Part B keyboard shortcuts for Part B help for Part B Request Answer J
- A gardener is using a tool as shown in the figure to pull weeds. 24 cm You will notice that the tool is designed with a built-in pivot point about which the torques are applied. If the gardener applies a 1.77 Nm torque (about the pivot point) in order to pull a weed, determine the resistive force (in N) the weed exerts on the weed puller. Ng disk with a radius a 0.500 m is subjected to three tangential forces of constant as shown below. The moment of inertia is Idisk =mr?. F2 and F3 are applied on the of the disk while F, is applied at 0.300 m from the center. Assume the rotation is enter of the disk.15
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