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a popular method of distributing music used to be on disks that had a radius of about 0.3m and spun at a constant angular velocity of about pi radians per second. There was a grove on the disc which mechanically shook a transducer to produce a signal. the closest it came to the center was about 0.05m so all of the information had to be stored betwwen the two radii. the longest runtime was about 22.5 minutes per side. the mass was about 0.3 kg
A. Find the tangential velocity at the inner and outer edges.
B. Find the moment of inertia of a disk.
C. Find the force required to stop the disk in 20 seconds applied by a finger at the outer edge.
A +5.8 µC charge is placed at the origin and a -3.9 µC charge is placed at x = 25 cm. At what coordinates can a third charge be placed
As it enters a pipe, a perfect fluid has spped 3.70 m/s. As it exits the pipe, the speed is 10.6 m/s. what is the radius of the pipe at the exit
A suspicious-looking man runs as fast as he can along a moving sidewalk from one end to the other, taking 4.00 s. find the ratio of the man's running speed to the sidewalk's speed
If the hanging 13.8 kg block falls a distance 0.633 m before coming to rest, calculate the coefficient of kinetic friction between the block m1 and the surface
A bullet of mass m = 25 g is fired into a wooden block of mass M = 4.5 kg. The block is attached to a string of length 1.5 m. The bullet is embedded in the block, causing block to then swing.
A ball is thrown from a rooftop with an initial downward velocity of magnitude vo = 5.8 m/s. The rooftop is a distance above the ground, h = 43 m.
A portable x-ray unit has a step-up transsformer, the 120 V input of which is transformed to the 100kV output needed by the x-ray tubr, what is the number of loops in the secondary
The electric potential at a position located a distance of 19.8 mm from a positive point charge of 7.80×10-9C, Calculate the value of the second charge
A 1.42 103-kg car traveling initially with a speed of 20.0 m/s in an easterly direction crashes into the rear end of a 9.00 103-kg truck moving in the same direction at 14.0 m/s. What is the velocity of the truck right after the collision
A projectile of mass 2.06 kg approaches a stationary target body at 7.70 m/s. What is the speed of the target body
Cost of electricity varies but typical values are around $0.15/kWh. Using this price, calculate the cost of making a piece of toast in 3.00 min with a 980W toaster
A star ship is circling a distant planet of radius. The astronauts determine that the acceleration because of gravity at their altitude is half the value at the planet's surface. How far above the surface are they orbiting? Your reply would be a m..
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