The tub of a washer goes into its spin-dry cycle, starting from rest and reachin
ID: 2144201 • Letter: T
Question
The tub of a washer goes into its spin-dry cycle, starting from rest and reaching an angular speed of 3.0 rev/s in 12.0 s. At this point the person doing the laundry opens the lid, and a safety switch turns off the washer. The tub slows to rest in 11.0 s. Through how many revolutions does the tub turn during this 23 s interval? Assume constant angular acceleration while it is starting and stopping.
rev
A roller-coaster vehicle has a mass of 509 kg when fully loaded with passengers (Fig. P7.28).
A 54.2 kg ice skater is moving at 3.94 m/s when she grabs the loose end of a rope, the opposite end of which is tied to a pole. She then moves in a circle of radius 0.795 m around the pole.
Explanation / Answer
a) Fn = mg + m*v^2/r
Fn = 509*9.8 + 509.17^2/10
Fn = 5303.21 N
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