In a popular amusement park ride, a rotating cylinder of radius 4.00 m is set in rotation at an angular speed of 6.00 rad/s, as in Figure P7.51. The floor then drops away, leaving the riders suspended against the wall in a vertical position. What minimum coefficient of friction between a rider’s clothing and the wall is needed to keep the rider from slipping? (Hint: Recall that the magnitude of the maximum force of static friction is equal to µn, where n is the normal force – in this case, the force causing the centripetal acceleration.)

 

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In a playground, there is a small merry-go-round of radius 1.20 m and mass 220 kg. Its radius of gyration is 91.0 cm. (Radius of gyration k is defined by the expression I=Mk2.) A child of mass 44.0 kg runs at a speed of 2.00 m/s along a path that is tangent to the rim of the initially stationary merry-go-round and then jumps on. Neglect friction between the bearings and the shaft of the merry-go-round. Calculate

(a) the rotational inertia of the merry-go-round about its axis of rotationkg·m2(b) the magnitude of the angular momentum of the child, while running, about the axis of rotation of the merry-go-round andkg·m2/s(c) the angular speed of the merry-go-round and child after the child has jumped on.rad/s

 

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In a physics lab, a small cube slides down a frictionless incline as shown in the figure, and elastically strikes a cube at the bottom that is only one-half its mass. if the inlicne is 30 cm hgih and the table is 90 cm off the floor, where does each cube land?

 

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In a photo like the Hubble Deep Field (Figure 20.1 in your textbook), we see galaxies in many different stages of their lives. In general, which galaxies are seen in the earliest (youngest) stages of their lives? D. the galaxies that are nearest to us

 

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In a periodic inventory system, the cost of inventories sold is:

Debited to accounts receivable.

Credited to cost of goods sold.

Debited to cost of goods sold.

Not recorded at the time goods are sold.

 

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