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A woman stands at the center of a platform. The woman and the platform rotate with an angular speed of 5.20 rad/s. Friction is negligible. Her arms are outstretched, and she is holding a dumbbell in each hand. In this position the total moment of inertia of the rotating system (platform, woman, and dumbbells) is 5.40 kg·m2. By pulling in her arms, she reduces the moment of inertia to 4.40 kg·m2. Find her new angular speed.
A parallel-plate capacitor has 1.85 cm2 plates that are separated by 5.72 mm with air between them. how much energy does it store
The boom in the crane is free to pivot about point P and is supported by the cable that joins halfway along its 18 m length. the cable passes over a pulley and is anchored at the back of crane. the boom has a mass of 1700 kg, distributed evenly an..
A bucket filled with water has a mass of 54 kg and is hanging from a rope that is wound around .050 m radius stationary cylinder. if the cylinder does not rotate and bucket hangs straight down, what is the magnitude of the torque the bucket produc..
assume the current in the coaxial cable, see the figure , is not uniformly distributed, but instead the current density varies linearly with distance from the center: for the inner conductor and for the outer conductor. Each conductor still carrie..
A child on the merry-go-round is moving with a speed of 1.15 m/s when 1.10 m from the center of the merry-go-round.
In the days before compact discs and MP3 players (ancient history!), music was recorded in scratches in the surface of vinyl-coated disks called records. Find the centripetal acceleration of a point on the edge of the record
A pot of hot water is boiling on your stove. The pot is in the shape of a round cylinder made of aluminum which is 10 cm in radius. What is the difference in temperature between the inner and outer sufaces of the aluminum bottom of the pot
A stationary particle of charge q = 2.5 x 10-8 C is placed in a laser beam (an electromagnetic wave) whose intensity is 2.6 x 103 W/m2. find the magnitude of the magnetic forces exerted on the particle
A clamped mechanical device (such as a metal ruler) oscillates in vacuum at a frequency (assume there is no damping in this case) of 10.0 Hz. Find the characteristic decay time for the damped motion
q1. an underwater diver sees the sun 56 above parallel.how high is the sun above the horizon to a fisherman in a boat
A 12 kg box slides 4.0 {rm m} down the frictionless ramp, and then collides with a spring whose spring constant is 240 N/m.
A vehicle is speeding at 115 km/h on a straight highway when a police car moving at 145 km/h enters the highway from an onramp and starts chasing it.
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