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A playground merry-go-round has a disk-shaped platform that rotateswith negligible friction about a vertical axis. The disk has a massof 200 kg and a radius of 1.9 m. A 34- kg child rides at the centerof the merry-go-round while a playmate sets it turning at 0.40rpm. If the child then walks along a radius to the outer edge of thedisk, how fast will the disk be turning (in rpm)?
A mine elevator is supported by a single steel cable 2.8 cm in diameter. The total mass of the elevator cage and occupants is 520 kg. By how much does the cable stretch when the elevator hangs by (a) 13 m of cable and (b) 364 m of cable? (Neglect the..
A football is kicked from the ground with a velocity of 38 m/s at an angle of 40 degrees and eventually lands at the same height. How far away does the ball land
A lens system consists of two lenses, one is converging and the other is a diverging lens. A screen is placed 32 cm to the right of the converging lens. Find the focal length of the diverging lens
A loop of area 0.100 m^2 is rotating at 3600 rpm (revolutions per minute) with an axis of rotation perpendicular to a 0.20 T magnetic field. what is the maximum voltage induced in the loop
1.a 0.089 kg bullet is traveling at 338 ms when it strikes a block of wood. if the bullet penetrates 0.74 m into the
A diver springs upward with an initial speed of 1.9 m/s from a 4.0-m board. What is the highest point he reaches above the water
An oak barrel with a lid of area 0.20 m2 is filled with water. A long, thin tube of cross-sectional area 5.0 X 10-5 m2 is inserted into a hole at the center of the lid, What was the net force on the lid due to the water pressure
A uniform ring with a radius of 2.15 cm and a total charge of 6.37 ?C rotates with a constant angular speed of 3.84 rad/s, What is the magnetic moment of the rotating ring
The coil of a galvanometer has a resistance of 18.6 ?, and its meter deflects full scale when a current of 6.48 mA passes through it. What is the maximum current that this ammeter can read
A 0.45mW laser produces a beam of light with a diameter of 1.5mm. What is the average intensity of this beam
Two 10-cm-diameter charged rings face each other, 18.0cm apart. Both rings are charged to + 50.0nC . What is the electric field strength at the center of the left ring
A 2.5 kg object is attached to a horizontal spring of force constant k = 4.1 kN/m. The spring is stretched 10 cm from equilibrium and released. Find the maximum acceleration
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